EP0607430A1 - Appareil de fabrication de tubes en acier soude - Google Patents

Appareil de fabrication de tubes en acier soude Download PDF

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Publication number
EP0607430A1
EP0607430A1 EP90917533A EP90917533A EP0607430A1 EP 0607430 A1 EP0607430 A1 EP 0607430A1 EP 90917533 A EP90917533 A EP 90917533A EP 90917533 A EP90917533 A EP 90917533A EP 0607430 A1 EP0607430 A1 EP 0607430A1
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EP
European Patent Office
Prior art keywords
roll
rolls
pipe
upper roll
center bending
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90917533A
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German (de)
English (en)
Other versions
EP0607430B1 (fr
EP0607430A4 (fr
Inventor
T. Kawasaki Steel Corporation Technical Toyooka
Y. Kawasaki Steel Corp. Technical Hashimoto
Susumu Kawasaki Steel Corporation Itadani
Tsutomu Kawasaki Steel Corporation Ide
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1314694A external-priority patent/JPH0636943B2/ja
Priority claimed from JP1314696A external-priority patent/JPH03174922A/ja
Priority claimed from JP1317290A external-priority patent/JPH06104252B2/ja
Priority claimed from JP89317289A external-priority patent/JPH03180211A/ja
Priority claimed from JP2306297A external-priority patent/JPH0698402B2/ja
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority claimed from PCT/JP1990/001572 external-priority patent/WO1991008064A1/fr
Publication of EP0607430A4 publication Critical patent/EP0607430A4/fr
Publication of EP0607430A1 publication Critical patent/EP0607430A1/fr
Publication of EP0607430B1 publication Critical patent/EP0607430B1/fr
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
    • B21D5/12—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes making use of forming-rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams

Definitions

  • the present invention relates to a machine for manufacturing welded steel pipes, and a method for handling the same machine.
  • a welded steel pipe manufactured by roll forming a steel strip to shape a pipe and welding its butted seam is already well knowm.
  • an electrically seamed steel pipe manufactured by the electrically (resistance) welding of a seam is mainly produced.
  • the reference numeral 100 represents a pre-forming roll, 102, 104, 106 and 108 : break-down rolls, 110 ⁇ : inner rolls, EF : an edge forming roll, CR : cage rolls, 1F, 2F and 3F : fin pass rolls, and SQ : a squeezing roll, respectively.
  • a forming machine as shown in Fig.17 and Fig.18 has first developed (the official gazette of Japanese Patent Application Laid-open No. 135,428/1986).
  • This machine is composed so that an edge forming roll EF, first to fourth center bending rolls 1CB, 2CB, 3CB and 4CB and a large number of cage rolls CR ⁇ arranged on both the sides of these center bending rolls, a plurality of fin pass rolls 1F, 2F and 3F, and a squeezing roll SQ, are arranged in order from the upperstream side to the downstream side, wherein the edge forming roll EF serves to bend the pipe edge portions of a strip (Fig.18 a), the first to third center bending rolls 1CB, 2CB and 3CB and the cage rolls CR ⁇ serve to bend the boundaries the pipe side portions of the strip and the pipe bottom portion thereof (Figs.18 b, c and d), the fourth center bending roll 4CB and the cage rolls
  • the present invention is intended to provide a machine for manufacturing welded steel pipes and a method for handling the same machine.
  • the present invention is intended to solve such problems in the prior arts, and to improve the rate of operation.
  • a pipe is curved down by a force applied thereto from cage rolls in the last zone L of a cage roll forming zone, and in the sledding of a strip, its pipe end does not get smoothly into the next first fin pass roll 1F, and it may get out of the pass line so that the pipe forming becomes impossible. Even if the pipe end gets into there, the contact of the pipe with the down roll of the first fin pass roll 1F may be too strong, leading to the easy formation of roll flaws on the pipe.
  • a strip is subjected to the width-reduction forming by right and left cage rolls, furthermore, its pipe bottom portion may be deformed, namely folded partly so that the pipe forming is inferior.
  • the present invention is intended to eliminate such defects in the prior arts, and to achieve the stable forming of pipes.
  • an upper roll 36, of the edge bending rolls is made to be a pair of right and left split rolls 36a and 36b put on one shaft, wherein the pair of these split rolls 36a and 36b are such that the radius of curvature of the split roll surfaces on the mutually opposite face sides thereof, i.e. on the inner surface sides and the radius of curvature of the roll surfaces on the non-opposite face sides thereof, i.e. on the outer surface sides are made different.
  • the pair of thses split rolls 36a, 36b are made to be changeable for each other in the putting position with respect to a shaft 37 so that both the inner and outer face sides of these split rolls 36a, 36b can be reversed in position. It is, therefore, possible to form strip edges for two sizes of pipes to be produced, by use of the pair of these split upper rolls 36a, 36b together with down rolls 1.
  • a strip edge forming roll for a welded steel pipe serves to pass a strip while it is held between both the upper and down rolls, thereby forming on the edges of the strip a curved portion corresponding to the size of a pipe to be produced. It is, therefore, necessary to exchange the said rolls, evry time the size of a pipe to be produced is changed. Such roll exchange requires much labor and the number of rolls in proportion to the sizes of pipes to be produced.
  • the present invention is intended to provide a edge bending roll for welded steel pipes, in which the above problems are solved.
  • a roll forming machine in a welded steel pipe manufacturing line for working a steel strip continously comprises upper rolls and down rolls as the forming rolls, in which a steel strip is passed between the rolls so as to be bent in the so-called flower form. If the forming roll is exchanged every time the size of a pipe to be produced is changed, there are required a large number of forming rolls different in size, and their exchange is not easy, leading to the increase of cost. Recently, a split roll system has been, therefore, mainly used.
  • This split roll system is such that the forming roll is composed of split members divided right and left into two parts, i.e. split rolls, wherein the size of a pipe to be produced can be changed by adjusting the space between the split rolls.
  • an adjustment means therefor there are known, for instance one of having a herical adjustment mechanism, disclosed in the official gazette of Japanese Patent Application Laid-open No. 28,627/1982 and another of exchanging a spacer between split rolls, disclosed in the official gazette of Japanese Patent Application Laid-open No. 209,722/1982.
  • the former adjustment means is composed such that the horizontal main shaft thereof is a screw in itself and a pair of nuts screw-engaged with the said screw, wherein a pair of split rolls movably put on the main shaft are moved in the axial direction, respectively, by screw-moving the said nuts, so that the space between the split rolls can be adjusted. Accordingly, there is a large possibility of such a risk that the main shaft may be damaged due to the concentration of stress, when any large load is applied to the split rolls. Furthermore, the former adjustment means is not suitable, in particular in the case of manufacturing pipes from a thin sheet, in which high accuracy is required, because ithas no backlash adjustment mechanism.
  • the latter adjustment means is such that a spacer is made to intervene between a pair of right and left split rolls and the said specer is exchanged with one different in size at need. Every time the spacer is exchanged, accordingly, there are required so much labor and long time, because it is necessary to detach a main shaft from the machine and to detach the split rolls and the spacer from the main shaft, and then to assembly the split rolls and another spacer different in size in place of the old one and incorporate them into the machine.
  • the present invention is intended to solve such problems in the prior arts and to stabilize the quality of a product.
  • An upper roll which serves to cause a strip to progress as it is held between the upper roll and a down roll whereby it is gradually shaped into a tubular form, is provided so as to be adjustable in vertical position, in order that the roll surface of the said upper roll is made to accord with a pass line for strips different in thickness and the strips are pressed down.
  • the upper roll actuating apparatus therefor is usually provided so that screw shafts are provided standingly from the chocks at both the ends of an upper roll put-on shaft, and these screw shafts are incorporated in the worm jucks at both the right and left portions of a worm shaft supported on a stand, whereby the upper roll can be moved up and down, with the rotation of the worm shaft in both the normal and reverse directions.
  • the elimination of backlash in this appararus will be carried out by use of a special oil-hydraulic jack provided between the chocks at both the ends of a down roll put-on shaft and the chocks of the upper roll put-on shaft.
  • the present device is intended to eliminate such defects as mentioned above, and to carry out properly the elimination of backlash.
  • a forming machine as shown in Fig. 47 and Fig. 48.
  • This machine is composed so that a plurality of inner rolls 110 ⁇ , whose roll widths are smaller in order, are arranged from the upperstream side to the downstream side, and a large number of outer rolls, i.e. cage rolls CR ⁇ , CR ⁇ are arranged on both the sides of the said inner rolls, at heights and directions fitting to the forming situations, wherein a strip fed therein is gradually bent into a U-shaped form, and further into a circular form by applying force to the strip from the inside and the outside by these rolls.
  • the present invention is intended to eliminate these defects in the prior arts.
  • a machine for manufacturing welded steel pipes in which a strip is continuously roll-formed to shape a pipe and its butted seam is welded, and which is characterized in that an edge bending roll for constraining under pressure a strip from its pipe edge portions to the boundaries between the pipe edge portions and its pipe side portions to bend the strip, a first center bending roll for constraining under pressure the pipe side portions to bend the pipe side portions, second to fourth center bending rolls for constraining under pressure the strip from the boundaries between the pipe side portions and its pipe bottom portion to the pipe bottom portion and applying lateral pressure to the pipe from both sides to bend the boundaries and the pipe bottom portion and a plurality of cage rolls arranged on both the sides of these center bending rolls, first and second fin pass rolls for further forming under pressure the pipe, are arranged in order from the upperstream side to the downstream side of a roll forming process, wherein at least the edge bending roll, the first center bending roll, the first and second fin pass rolls each has a driving means provided
  • a machine for manufacturing welded steel pipes of the first aspect in which both the upper roll and down roll of the edge bending roll and the first center bending roll are made to be a split roll adjustable in width, the down roll each of the second to fourth center bending rolls is made to be a caliper-shaped one-part roll fitting to the maximum pipe diameter of an applicable common range of use, the upper roll of each of the second and third center bending rolls is made to be a split roll adjustable in width, and the upper roll of the fourth center bending roll is made to be a one-part roll applicable for common use, and the cage rolls are mounted so as to be adjustable for slant advance and retreat.
  • a method for handling a welded steel pipe manufacturing machine in which first to fourth center bending rolls are arranged in order in an intermediate roll-forming process and all the upper rolls of these center bending rolls are set in one housing, and which is characterized in that all the upper rolls of the first to fourth center bending rolls are exchanged at a strock by exchanging the said housing.
  • a method for handling a welded steel pipe manufacturing machine which is characterized in that all the down roll stands of first to fourth center bending rolls or all the down roll stands of second to fourth center bending rolls are set on one detachable common sub-base plate, and all the down rolls of the first to fourth center bending rolls are exchanged at a strock together with the said common sub-base plate.
  • the upper roll may be driven or not in the edge bending roll, and only each down roll may be driven in the second to fourth center bending rolls.
  • a strip of a predetermined size may be preferably fed from the upperstream side to the downstream side, for the manufacture of a steel pipe.
  • the strip will be, accordingly, dealed with, as follows:
  • each upper roll mounted on an upper roll common stand frame and each down roll mounted on a down roll common stand are made individually liftable, respectively.
  • a method for menufacturing welded steel pipes of the third aspect in which the upper roll common stand frame of the first to fourth center bending rolls has a positioning means and a clamping means provided thereon, and in the exchange of rolls, the clamping means is released to disengage the common stand frame, and then a new common stand frame is inserted, and set at a predetermined position by actuating the positioning means and clamping means.
  • a seventh aspect of the present invention there is provided a method for handling a welded steel pipe manufacturing machine of the fourth aspect, in which the down roll common stand frame of the first to fourth center bending rolls has a positioning means and a clamping means provided thereon, and in the exchange of rolls, the clamping means is released to disengage the common stand frame, and then a new common stand frame is inserted, and set at a predetermined position by actuating the positioning means and clamping means.
  • each upper roll and the exchange of each down roll may be preferably carried out together with a common stand frame at a strock.
  • the vertical adjustment of each upper roll and each down roll may be preferably carried out individually.
  • a machine for manufacturing welded steel pipes of the first aspect in which a bottom guide roll for receiving the pipe is arranged in a section between the fourth center bending roll and the first fin pass roll.
  • a bottom guide roll serves to support a pipe bottom portion at the final stage of a cage roll forming course, thereby preventing a pipe from being curved down so that the pipe can be made to keep on a normal pass line and it can be properly guided to the fin pass roll of a next stage.
  • an edge bending roll for use in the welded steel pipes manufacturing machine of the first aspect, in which the down roll and upper roll thereof each is made to be a pair of split rolls symmetrical right and left, said down roll is made to be a stepped roll having plural steps different in outside diameter in which the inner side has a smaller, wherein concavely curved portions different in radius of curvature are provided respectively in the portion of each step opposite to the edges of a strip, and in said upper roll, the contour of its outer peripheral profile in a plane including the roll center axis is such that only the outer face side of the roll has a convexly curved form, the upper roll is journaled in a holder so that its setting position can be changed to a position opposite to each step of the said stepped roll, and the convexly curved form of the upper roll comprises a combination of sectors different in radius of curvature, and the upper roll holder has a function of inclining the upper roll in the breadth direction of
  • an edge bending roll of the ninth aspect in which the center of inclination of the upper roll is set on the normal line erected at the end of the convexly curved face of the upper roll.
  • an upper roll supporting apparatus for the edge bending roll of the ninth aspect which is comprises a lifting frame supported liftably in a housing, an upper roll supporting frame supported on the lifting frame movably in the breadth direction of the upper roll, an upper roll holder supported for inclination on the upper roll supporting frame, a jack device provided between the upper roll supporting frame and the upper roll holder for inclining the upper roll holder, a cylinder device for pressing the lifting frame in the direction of the forming reaction force, and a cylinder device for pressing the upper roll holder in the direction of the forming reaction force.
  • the down rolls 1a, 1b and upper rolls 36a, 36b are such that the space adjustment between the upper and down rolls can be carried out fitting to the width of a strip 4.
  • the down and upper rolls are made adjustable in position in the vertical direction.
  • the down roll is made to be a stepped roll having plural steps different in outside diameter in which the inner side has a small diameter, wherein concavely curved portions different in radius of curvature are provided respectively in the portion 5 of each step opposite to the edge of a strip.
  • the down roll can be used for various kinds of strips.
  • the contoure of its outer peripheral profile in a plane including the roll center axis is such that only the outer face side of the upper roll has a convexly curved form, but omitted on the inner side thereof.
  • the upper roll can be made thin in roll thickness, and the roll holder thereof can be made thick and high in rigidity.
  • the upper roll is journaled in this holder, and the upper roll can be exchanged opposite to each of the caliper steps of the said stepped roll by being drawn out of the bearings. Accordingly, the upper roll can be fitted to various strips different in width and thickness.
  • the convexly curved portion of the upper roll is shaped in the form comprising a combination of sectors different in radius of curvature, and on the other hand, the roll surface of the upper roll is made capable of being inclined in a direction shown at an angle of ⁇ in the breadth direction of the strip, as shown in Fig.30.
  • an adjusting device for a driven forming roll for use in the welded steel pipe manufacturing machine of the first aspect, in which the structure of a driven forming roll such as the down roll of the edge bending roll, and the upper and down rolls of the first center bending roll is composed so that on the outer periphery of the middle portion of a hollow main shaft journaled on both the sides, a pair of right and left cylindrical roll holders are put slidably in the axial direction, and a position retaining means is provided for retaining the roll holders at an optional position, and a pair of right and left split forming rolls are in both the holders at their inner ends, respectively, a gear for mechanically engaging the main shaft to a driving unit is fixed at one end of the main shaft, and further an adjustment shaft is rotatably put running through the hollow inside of the said main shaft, a pair of threaded portions different in the thread direction are provided at both the ends of the adjustment shaft and screw-movers are engaged for screw-
  • the position retaining means is caused to work again, thereby constraining the position of both the roll holders, i.e. the position of the split forming rolls.
  • a rotating force is supplied from a driving apparatus. This rotating force is transmitted to gears and then transmitted to the split forming rolls by way of the main shaft and both the holders.
  • an adjusting device for a non-driven forming roll for use in the welded steel pipe manufacturing machine of the first aspect, in which the structure of a non-driven forming roll such as each upper roll of the second to third center bending rolls is composed so that both the right and left portions of a main shaft formed by putting an outer cylinder shaft rotatably on the outer periphery of a core shaft are fixed on supporting plates, a pair of right and left sliding sleeves with a positioning mechanism are put on the middle portion of the said main shaft so as to be slidable in the axial direction, and a pair of right and left split rolls are put rotatably on the outer peripheries of the said sleeves, respectively, and screw shafts which are mutually in a reverse screw relation are provided projectingly from both the ends of the said core shaft, respectively, nuts screw-engaged with the both these screw shafts and the said sliding sleeves are connected with each other by rods and a core shaft-rotating means is attached on the
  • a core shaft 502 is rotated with respect to an outer cylinder shaft 503 fixedly supported at both its ends on supporting plates 510, 510.
  • nuts 505, 505 connected with sliding sleeves 515, 515 which do not rotate with respect to the outer cylinder shaft by rods 530, 530 are screw-advanced toward the supporting plates 510, 510, because their screw shafts 504, 504 are mutually in reverse screw relation. Accordingly, the sliding sleeves 515, 515 are pushed by the rods 530, 530 so as to move together with split rolls 520, 520 in such a direction that they approach to each other.
  • the outer cylinder shaft 503 and the sliding sleeves 515, 515 can be fixed by actuating a positioning mechanism at a position where the space between the split rolls is fitted to the width of a strip to be shaped into a tubular form. If the strip is held between the upper and down split rolls at the same position, it is deformed into a tubular form, as it is caused to progress.
  • a backlash eliminating means in the upper roll actuating apparatus for the edge bending roll, center bending rolls and fin pass rolls, for use in the welded steel pipe manufacturing machine of the first aspect in which a screw shaft is erected from second chocks supporting both the ends of an upper roll put-on shaft, respectively, each of these screw shafts is incorporated in worm jacks at both the right and left portions of a worm shaft supported on a stand, an upper roll actuating apparatus is provided for making the upper roll movable up and down by way of the said screw shafts by the rotation of the said worm shaft in both the normal and reverse directions, a fluid-hydraulic cylinder is provided above both the said screw shafts, respectively, and the piston rods of the said cylinders are connected with the upper ends of both the screw shafts so that the upper roll can be pulled up.
  • the up and down movements of an upper roll 605 are carried out with the rotation of a worm shaft 613 caused by a reversible motor 616 in both the normal and reverse directions.
  • screw shafts 608, 608 are caused to go down by the actuation of worm jacks 614, 614, thereby causing the upper roll 605 to go down, and reversely when the worm shaft is rotated in the reverse direction, the worm jacks are actuated in the reverse direction, thereby causing the upper roll to go up by way of the screw shafts.
  • the backlash elimination of the worm jacks is carried out by pulling up the said screw shafts 608, 608 by the actuation of fluid-hydraulic cylinders 617, 617.
  • the pulling-up force of the said fluid-hydraulic cylinders may be preferably set to be the sum of the tare of the pulling-up portions, i.e. the screw shaft 608, the second chock 607, the upper roll put-on shaft 606 and the upper roll 605 in an embodiment shown in Fig.43, or the screw shaft 608, the suspension base plate 628, the arms 629, 629, the upper roll put-on shaft 606 and the upper roll 605 in another embodiment shown in Fig.3, and 10 % ⁇ 20 % of the strip forming load.
  • a cage roll for use in the welded steel pipe manufacturing machine of the first aspect, in which the roll surface thereof is shaped in the form of a concavely curved face having a larger radius of curvature than that of a forming flower at its own position.
  • the roll surface shaped in the form of a concavely curved face serves to form under pressure a strip to be bent, as it is wraped.
  • this roll surface is suitably fitted to the convexly curved face of a forming flower, so that the roll-contacted portion of the strip is not made flat in a stripe-pattern.
  • Fig.1 is an illustrative view of the constitution of a welded steel pipe manufacturing machine according to the present invention.
  • Fig.2 to Fig.10 show the embodiment of the present invention
  • Fig.2 is a side view of the machine in a roll forming process
  • Fig.3 is a front view of the first center bending roll
  • Fig.4 is a front view of the third center bending roll
  • Fig.5 is a front view of the fourth center bending roll
  • Fig.6 is a plan view of the cage roll
  • Fig.7 is an enlarged front view of the main part of the first center bending roll
  • Fig.8 and Fig.9 are enlarged front views of the main parts of the second to fourth center bending rolls, for a small size of a pipe to be produced and for a large size
  • Fig.10 is a graph.
  • Fig.11 to Fig.20 show prior art examples
  • Fig.11 is a plan view of the constitutional essentials of a first prior art example
  • Fig.12 is an enlarged cutaway front view of the main part of the same example
  • Fig.13 is a perspective view of a second prior art example
  • Fig.14 is a sectional view taken along the line XIV-XIV of Fig.13
  • Fig.15 is a sectional view taken along the line XV-XV of Fig.13
  • Fig.16 is an illustrative view of the main parts of the first and second prior art examples
  • Fig.17 is a plan view of the constitutional essentials of a third prior art example
  • Fig.18 a, b ⁇ and f are views of the main parts taken along the lines a-a, b-b, ⁇ and f-f of Fig.17
  • Fig.19 and Fig.20 each is an enlarged front view of the main part of the center bending
  • Fig.21 is a front view of the bottom guide roll
  • Fig.22 is a side view
  • Fig.23 is a plan view
  • Fig.24 is a rear elevational view of the main part
  • Fig.25 is a plan view of the main part
  • Fig.26 is an enlarged side view of the main part
  • Fig.27 is an enlarged cutaway rear elevational view of the same main part.
  • Fig.28 is an illustrative view of the forming method for different forming sizes, in which the strip edge forming roll according to the present invention is used, taken from the front.
  • Fig.29 is an illustrative view showing the setting situation of the upper amd down rolls in the forming of a thick strip.
  • Fig.30 is an illustrative view showing the setting situation of the upper roll inclined in the forming of a thin strip.
  • Fig.31 is a front view of the machine, in which one embodiment of the present invention is shown.
  • Fig.32 is a cross sectional view of the portion of the machine shown in Fig.31 wherein the upper roll is incorporated.
  • Fig.33 is a graph for comparing the bending curvatures of strip edges.
  • Fig.34 is an illustrative view of one of prior art forming methods.
  • Fig.35 is a cutaway front view
  • Fig.36 is a side elevationional view
  • Fig.37 is a cutaway plan view, taken along the line A-A of Fig.35
  • Fig.38 is a semi-cutaway plan view, taken along the line B-B of Fig.36
  • Fig.39 is a side view of the main parts
  • Fig.40 is a cutaway plan view of the main parts, taken along the line C-C of Fig.35.
  • Fig.41 is a plan view of the device according to the present invention
  • Fig.42 is a cross-sectional view thereof, taken from the front.
  • Fig.43 is a partially cutaway front view of the means according to the present device.
  • Fig.44 is an enlarged elevational view in section of the main parts of Fig.1, and Fig.45 and Fig.46 are views illustrative of the operation.
  • Fig.47 to Fig.52 show an prior art example, wherein Fig.47 is a plan view illustrative of the constitutional essentials of a forming machine, Fig.48 is a sectional view taken along the line VI-VI of Fig.47, and Fig.49 to Fig.52 are views illustrative of the operation.
  • this machine is composed so that an edge bending roll EB, first to fourth center bending rolls 1CB, 2CB, 3CB and 4CB, a plurality of cage rolls CR.. arranged on both the sides from the second center bending roll to the downstream side of the fourth center bending roll, first and second fin pass rolls 1F and 2F, a rotary seam guide roll RSG, a high frequency welder HFW and a squeezing roll SQ, are arranged in order from the upperstream side to the downstream side.
  • the edge bending roll EB, the first to fourth center bending roll 1CB, 2CB, 3CB and 4CB and the first and second fin pass rolls 1F and 2F each comprises an upper roll U and a down roll D
  • the plurality of the cage rolls CR.. and the squeezing roll SQ each comprises a pair of right and left rolls.
  • the first to fourth center bending rolls 1CB, 2CB, 3CB and 4CB each is given a predetermined range of use. Providing that steel pipes, 22.22 mm ⁇ 60.5 mm in outer diameter, are manufactured, for instance, as shown in Fig.10, three sets of roll groups 1 , 2 and 3 will be provided for which have applicable ranges of use:
  • a side roll SD is arranged between the first and second fin pass rolls, it may be omitted.
  • their roll shaft is mechanically connected with a driving source by way of a universal joint.
  • the upper roll U of the edge bending roll EB, the down roll D ⁇ of each of the second to fourth center bending rolls 2CB, 3CB and 4CB, and the squeezing roll SQ can be drived.
  • Both the upper and down rolls of the edge bending roll EB are made to be a split roll and adjustable in width in accordance with the size of a pipe to be produced.
  • the edge bending roll EB serves to constrain under pressure a strip from its pipe edge portions to the boundaries between the pipe edge portions and its pipe side portions so that the strip is fed, and at the same time, the pipe edge portions and the bondaries are bent almost equally to a finally formed circle, with anticipating the spring-back.
  • the first center bending roll 1CB As shown in Fig. 3 and Fig.7, its down roll D is made to be a split roll comprising three parts, i.e. comparatively wide right and left members 12 and 13 and a comparatively narrow intermediate member 11, and its upper roll U is made to be a split roll comprising two parts, right and left members 14 and 15, wherein the upper and down rolls each has a width-adjusting means 22, 22, so as to be adjustable in width in accordance with the size of a pipe to be produced.
  • the first center bending roll 1CB serves to constrain under pressure the pipe side portions of the strip so that the strip is fed, and at the same time it is bent slightly.
  • the bending extent in this stage may be such that the caliper radius at an intermediate point within a range of the size of a pipe to be produced (the outside diameter of a pipe) applicable for this roll is about 2.5 times as the caliper radius of the squeezing roll SQ fitting thereto.
  • the first one-part roll for the range 1 is shaped in a caliper-shaped form fitting to 31.03 mm, the second for the range 2 in a caliper-shaped form fitting to 43.33 mm, and the third for the range 3 in a caliper-shaped form fitting to 60.5 mm, respectively.
  • each of them is shaped in a caliper-shaped form fitting to the maximum outside diameter of an applicable common rage of use.
  • the second and third center bending rolls 2CB and 3CB as shown in Fig.4 and Fig.8 (Fig.9), their upper rolls U, U each is made to be a split roll comprising two parts, right and left members 17 and 18, and adjustable in width in accordance with the size of a pipe to be produced (Fig.8 shows a case of a smaller size of a pipe to be produced and Fig.9 shows a case of a larger one).
  • the upper roll U of the fourth center bending roll 4CB is made to be a one-part roll 28, as shown in Fig.5.
  • the second and third center bending rolls 2CB and 3CB serve to constrain under pressure the pipe side portions of the strip and the boundaries between the pipe side portions and pipe bottom portion and the fourth center bending roll 4CB serves to constrains under pressure the pipe bottom portion, and these center bending rolls bend the same boundaries in excess of the bending extent for providing the finally formed circle and the pipe bottom portion in an extent equal to that for providing the finally formed circle, or in excess, together with the plurality of the cage rolls CR ⁇ , CR ⁇ arranged on both the sides thereof.
  • the cage rolls CR ⁇ , CR ⁇ as shown in Fig.2 and Fig.4 to Fig.6, there are arranged the total of twelve rolls in four zones, three rolls in each zone, on both sides from the upperstream position of the second center bending roll 2CB to the downstream position of the fourth center bending roll 4CB, and these cage rolls apply lateral pressure to the pipe from both sides, together with the second to fourth center bending rolls, whereby the strip from the boundaries between the pipe side portions and pipe bottom portion to the pipe bottom portion is bent in order, as mentioned above.
  • the first and second fin pass rolls 1F and 2F each comprises a finned upper roll and a finless down roll.
  • the first fin pass roll 1F serves to form under pressure the pipe which has become oval-shaped in cross section at the previous step so that the boundaries between the pipe edge portions and pipe side portions and the boundaries between the pipe side portions and pipe bottom portion are further bent in excess and the pipe edge portions are bent in a proper degree
  • the second fin pass roll 2F serves to form under pressure the pipe successiveively so that the pipe side portions are protruded outward and bent almost equally to the finally formed circle and at the same time, each of the said boundaries is unbent nearly to the finally formed circle.
  • the rotary seam guide roll RSG comprises a finned upper roll and a finless down roll, which rolls are adjustable in position and angle, and it serves to arrange the pipe in a normal welding attitude.
  • the high frequency welder HFW is one kind of resistance welder, whereby a welding current is caused to pass in the resulting seam of the pipe to heat and melt the same seam.
  • the squeezing roll SQ (Fig.1) comprises a pair of right and left rolls which press the pipe from both sides so that the melted seam is upset-bonded and the thus-bonded pipe is corrected in shape into the form of a circle.
  • first and second fin pass rolls 1F and 2F, rotary seam guide roll RSG by the way, as shown in Fig.1 and Fig.2, their upper and down rolls U ⁇ , D ⁇ are mounted, for exchange of the rolls, on an independent roll stand 19, respectively, and in the squeezing roll SQ, its right and left rolls are mounted, for exchange of the rolls, on a roll stand 20.
  • each zone as shown in Fig.2 and Fig.4 to Fig.6, the three cage rolls CR ⁇ are mounted in one roll stand 24 ⁇ , and each roll stand has a slant advance and retreat control means 25 common to the three cage rolls.
  • the control in this case may be carried out mainly on the intermediate roll.
  • the cage rolls can be applied to all the sizes of pipes to be produced.
  • the angle of the cage rolls may be satisfactorily set previously in accordance with their positions.
  • the present invention has the following effects.
  • first to fourth center bending rolls 1CB, 2CB, 3CB and 4CB each comprises an upper roll U ⁇ and a down roll D ⁇ which stand opposite to each other, wherein each down roll D ⁇ and each upper roll U ⁇ are mounted on a common stand frame 202 for the down rolls, arranged on a base plate 201, and a common stand frame 203 for the upper rolls, respectively.
  • the upper roll U and down roll D of the first center bending roll 1CB each is made to be a driving roll connected to a driving means and all the other rolls each is made to be a non-driven roll.
  • the down roll common stand frame 202 is composed so that four pairs of chocks 222, 222, 223, 223 ⁇ , each pair consisting of a right chock and a left chock, are arranged inorder on both the sides of a groove-shaped frame 221 which is long in the line diection, and the down rolls D ⁇ of the first to fourth center bending rolls 1CB, 2CB, 3CB and 4CB are journaled in these chocks.
  • the portion of the frame 221 for the first center bending roll 1CB is made broaded in width so as to be suitable for driving, because its down roll D is of a driving roll.
  • the down roll common stand frame 202 is arranged detachably on a base plate 201, and positioned at a predetermined position by a positioning means 204 and a clamping means 205.
  • the positioning means 204 is composed so that on both the sides of the down roll common stand frame 202, two pairs of breadth fittings 241, 241, 242, 242 are arranged against the front and rear and a butt fitting 243 is arranged against the rear end, each of these fittings being fixed on the base plate 201, and an oil-hydraulic cylinder 244 for pressing backward the down roll common stand frame 202 is arranged against the front and fixed on the base plate.
  • the down roll common stand frame 202 will be positioned by inserting the same stand frame 202 between the breadth fittings 241, 241, 242, 242 and actuating the oil-hydraulic cylinder 244 to press the same stand frame 202 against the butt fitting 243.
  • the clamping means 205 is composed so that a semi-circular engaging projection 251 ⁇ is arranged respectively at the front and rear on both the sides of the down roll common stand frame 202, and an oil-hydraulic clamp 252 ⁇ is arranged against each of these engaging projections 251 ⁇ and mounted on the base plate 201. Thus, these oil-hydraulic clamps 252 ⁇ will be engaged with each of the engaging projections 251 by oil pressure.
  • reference numeral 206 represents a suspension ring provided at the front and rear of the down roll common stand frame 202 respectively.
  • the upper roll common stand frame 203 is composed so that cylindrical legs 231, 232 are arranged at the front and rear and fixed on the base plate 201, and a horizontal frame 233 is detachably mounted on the said legs, and the upper rolls U ⁇ of the first to fourth center bending rolls 1CB, 2CB, 3CB and 4CB are mounted movably up and down on the said horizontal frame.
  • the upper rolls U ⁇ each is journaled on a lifting frame 235 which is lifted by a worm jack 234 ⁇ , and these lifting frames are engaged liftably and slidably on a pair of vertical sliding guides 236, 236 ⁇ , arranged on the horizontal frame 233.
  • Two worm jacks 234 ⁇ are arranged for the upper roll U of the first center bending roll and one worm jack 234 for the upper rolls U ⁇ of the other center bending rolls, respectively on the horizontal frame 233, because the upper roll U of the first center bending roll 1CB is a driving roll and the lifting frame 235 is given large load.
  • These worm jacks 234 ⁇ will be driven by reversible reduction motors 237 ⁇ .
  • the horizontal frame 233 there are arranged one oil-hydraulic cylinder 238 for the lifting frame 235 of the first center bending roll 1CB, and two air cylinders 239 ⁇ for each of the other lifting frames 235, respectively, wherein upward force is applied to the lifting frames, thereby eliminating a play of the worm jacks 234.
  • a positioning means 207 and a clamping means 208 are further installed between the legs 231, 232 and the horizontal frame 233.
  • the positioning means 207 is composed so that butt fittings 271 ⁇ are provided at the right end of the top surfaces of both the front and rear legs 231, 232 and at the right and left rears of the top surfaces of the rear legs 232, and oil-hydraulic cylinders 272, 272 for pressing the horizontal frame 233 right are provided at the left end of the top surfaces of both the front and rear legs 231, 232, and oil-hydraulic cylinders 273, 273 for pressing the horizontal frame 232 backward at the right and left front ends of the top surfaces of the rear legs 232, respectively.
  • the horizontal frame 233 will be set at a predetermined position by pressing the same frame 233 into contact with the butt fittings 271 ⁇ by these oil-hydraulic cylinders.
  • the clamping means 208 comprises fastening bolts 281 ⁇ , each directed backward, which are mounted at the right and left front ends of the top surfaces of both the front and rear legs 231, 232, respectively, whereby the horizontal frame 233 set at the predetermined position can be fastened and fixed.
  • the following procedure may be preferably taken for the exchange of rolls in the first to fourth center bending rolls 1CB, 2CB, 3CB and 4CB.
  • a bottom guide roll stand 60 is arranged midway between the right and left cage roll stands 24, 24 placed on a base plate.
  • the bottom guide roll stand 60 is made up by stand body between the stand bodies of the said right and left cage roll stands 24, 24, and further arranging, above the said bed plate, two bottom guide rolls BGR ⁇ in order along the line (See : Fig.6) and journaling each of these bottom guide rolls on a pair of bearings placed on the bed plate.
  • Fig.28 to Fig.30 will be described.
  • Down rolls 1a, 1b, split right and left, are put on the outer periphery of a shaft 2 so that the space 7 between both these down rolls is adjustable.
  • the right and left split down rolls 1a, 1b each is made to be a stepped rolls having two large and small steps in which the inner face side has a small outer diameter and the outer face side has a large outer diameter, wherein on these respective steps different in outer diameter, concavely curved peripheral surfaces 3a, 3b having radii of curvature RB-1 and RB-2 different from each other are provided on the portions thereof opposite to the edge of a strip, respectvely.
  • RB-1 is for the size of a small-diametered pipe to be produced
  • RB-2 is for the size of a large-diametered one.
  • the forming of a strip 4 will be carried out at a predetermined pass line height. Since the respective steps of the said down roll are different in outside diameter, accordingly, the shaft 2 is provided so that its height is adjustable, in order that the roll surface at each step can be accorded to its pass line height. When the down roll is driven, a transmission gear must be attached in order that the speed of the roll surface can be kept constant in spite of the difference in outside diameter of the respective steps.
  • the upper roll is also made to be upper rolls 36a, 36b, split right and left, in which each roll is journaled by a roll holder 16a, 16b (See: Fig.31).
  • the roll holders are also adjustable in space between them.
  • the upper roll is made to be capable of being inclined in the breadth direction of the strip 4 by way of the upper roll holder, whereby the operation face of the roll surface of the upper roll can be changed, and namely the upper roll can be set inclinedly, as shown in Fig.30.
  • the convexly curved face portion of the upper roll its cross-sectional profile is shaped in such a form that two sectors having a radius of curvature RU-1 used for the forming of a thin strip (small in thickness) and a radius of curvature RU-2 used for the forming of a thick strip (large in thickness) are made adjacent as shown in Fig.29 and Fig.30.
  • the roll surface portion with the radius of curvature RU-1 may be preferably applied for strips of the minimum thickness to the middle thickness, and the roll surface portion with the radius of curvature RU-2 for strips of the middle thickness to the maximum thickness, respectively.
  • the roll surface portion with the radius of curvature RU-1 will be used by inclining the upper roll 36 by an inclining mechanism, as shown in Fig.30.
  • the center of inclination of the upper roll 36 will be set on the normal line erected at the end of the convexly curved face of the upper roll 36 (for instance, on the dotted line of Fig.29). This can facilitate the setting of the upper roll 36 and decrease the change in the gap between the upper and down rolls, even when the upper roll 36 is inclined.
  • the roll surface portion with the radius of curvature RU-2 will be used by erecting the upper roll 36 vertically, as shown in Fig.29.
  • the upper roll 36 may be used by setting the angle of inclination ⁇ thereof at a proper value within a range which can be set.
  • the upper roll shall be of such a system that the upper roll is drawn out for exchange from the roll holder when each of the RB-1 face portion for the size of small outside diameter and the RB-2 face portion for the size of large outside diameter of the stepped down roll is used.
  • the upper roll in conclusion, there will be provided two rolls, one for the small size of outside diameter, covering the minimum outside diameter to the middle outside diameter, and another for the large size of outside diameter, covering the middle outside diameter to the maximum outside diameter.
  • the applicable ranges of use for the upper and down rolls in the edge bending roll EB will be divided to three ranges, 1 22.22 mm ⁇ 31.03 mm, 2 31.03 mm ⁇ 43.33 mm and 3 43.33 mm ⁇ 60.5 mm, and in each of the upper roll and down roll, three sets of roll groups 1, 2 and 3 will be provided for.
  • the down roll for 1 has RB-1 of 22.22 mm ⁇ 26.63 mm and RB-2 of 26.64 mm ⁇ 31.03 mm
  • the down roll for 2 has RB-1 of 31.04 mm ⁇ 37.18 mm and RB-2 of 37.19 mm ⁇ 43.33 mm
  • the down roll for 3 has RB-1 of 43.34 mm ⁇ 51.92 mm and RB-2 of 51.93 mm ⁇ 60.5 mm.
  • the down rolls 1a, 1b and upper rolls 36a, 36b will be incorporated in such a machine as shown in Fig.31. Both the ends of the down roll shaft 2 are supported in down roll journaling portions 50.
  • a beam 6 is supported as a lift frame which is lifted by a worm jack 42 driven by a press motor 41, and the said beam 6 is being pressed by an air cylinder 43 in the same direction as the direction of the forming reaction force.
  • slide rails 5 are installed up and down in a direction meeting at right angles with the progressing direction of the strip 4.
  • These slide rails are fixed on a beam 6 as a lifting frame which is supported at both its right and left ends by a housing 40.
  • the said beam 6 is movable up and down with respect to the housing 40 so that a clearance for holding the strip between the said down rolls and the upper rolls, hereinafter mentioned, can be adjusted.
  • a pair of right and left main apparatus bodies 10a and 10b are mounted on the slide rails 5. These main apparatus bodies 10a, 10b are mounted for sliding movement on the side rails 5, and upper roll supporting frames 14 are hung at a given interval from the middle portion of the beam 6 in the longitudinal direction between the side rails and the beams. Both the right and left ends of the upper roll supporting frame 14 have a threaded portion, and a shaft 13 having a screw-threaded portion engaged with the said threaded portion of the upper roll supporting frame 14 is journaled by the fixing plate portions provided at both the right and left ends between both the beams.
  • the shaft 13 is connected to a reversible motor 15 fixed on the fixing plate portion so that the movement of the upper roll in the breadth direction is made possible.
  • the upper roll supporting frame has shafts 22, 26 provided in parallel to the progressing direction of the strip and the upper roll holder 16 also has a simillar shaft 24 provided thereon, and a worm jack 28 for giving a turning function for the upper roll and an AC reversible motor 33 for driving the same worm jack are mounted on the said shaft 26.
  • the rectilinear motion of the worm jack 28 will be changed to the turning motion for the upper roll holder 16 and upper roll 36 by use of the said three shafts 22, 24 and 26 as fulcrums.
  • An air cylinder 30 is provided between the upper roll holder 16 and upper roll supporting frame 14, so that backlash existing in the upper roll and upper roll holder can be eliminated.
  • the upper roll supporting apparatus of the edge bending roll EB shown in Fig.31 comprises having the beam 6 as a lifting frame which is supported liftably in the housing 40, an upper roll supporting frame 14 supported on the beam 6 movably in the breadth direction of the upper roll, an upper roll holder 16 supported for inclination on the upper roll supporting frame 14, a worm jack 28 provided between the upper roll supporting frame 14 and the upper roll holder 16 for inclining the upper roll holder 16, an air cylinder 43 for pressing the beam 6 in the direction of the forming reaction force, and an air cylinder 30 for pressing the upper roll holder 16 in the direction of the forming reaction force.
  • FIG.32 An assembly of the upper roll 36 and upper roll holder 16 is shown in Fig.32.
  • the upper roll in this embodiment is incorporated in the upper roll holder 16 in such a structure as shown in Fig.32, in which the roll exchange will be carried out by releasing the fastening nuts 38, 39 on the outer face side, drawing out the roll shaft 34, and removing the roll shaft 34 from the upper roll 36.
  • a set of upper and down strip edge forming rolls each is made to be a pair of right and left split rolls and plural roll surface portions different in radius of curvature are provided respectively on these upper and down rolls, the edge forming of plural strips different in the size of a pipe to be produced can be carried out, in spite of one set of the rolls, whereby the number of rolls required therefore can be decreased and the labor for the roll exchange can be reduced.
  • the upper roll holder is given a function of inclining the upper roll in the breadth direction of the strip and the roll surface of the upper roll is divided into two or more portions different in radius of curvature, furthermore, the accuracy and performance of the strip edge forming can be improved by positioning these portions opposite to the roll surfaces of the down roll, whereby the outer peripheral surface of the upper roll can be effectively utilized as the plural upper roll surface portions.
  • the rigidity of the holder can be increased and the reversing mechanism of the upper roll holder can be placed therein.
  • the mill rigidity of the whole of the upper rolls is increased, the fulcrums of turn of the upper roll are made to have access to the pressing point of the rolls as near as possible and the elimination of backlash is realized, the accuracy of setting the upper roll can be improved and the accuracy and performance of forming the strip edges can be sharply improved, with the mill rigidity improved.
  • Table 1 there are shown the frequency of roll exchange in the prior art example 1 (Fig.34), the prior art example 2 (Japanese Patent Application No.317289/1989) and the method according to the present invention, in the forming of strips for the outside diameters of pipes to be produced in a range of 31 ⁇ mm ⁇ 44 ⁇ mm. Furthermore, the compasison of the strip edge bending characteristics in the case of Standard SUS 430 strips, 38.1 ⁇ mm x 1.2 t mm and 2.5 t mm, are shown in Figs.33(a) and (b).
  • (C-1) A driven split forming roll adjusting device for the down roll of the edge bending roll, the upper and down rolls of the first center bending roll or the likes
  • FIG.35 to Fig.40 show a center bending roll of the driving type according to the present invention.
  • UR represents an upper roll
  • DR a down roll
  • the reference numeral 301 represents a main hollow shaft journaled at both its ends on supporting frames 302a and 302b, 303a, 303b : a pair of right and left cylindrical roll holders put on the outer periphery of the middle portion of the said main shaft 301 so as to be slidable in the axial direction, 304a, 304b : position retaining means provided in the said roll holders, which will be stopped at an optional position, and 305a, 305b : a pair of right and left split forming rolls fixed at the inner ends of the said roll holders, respectively.
  • the split forming rolls of the down roll have an auxiliary roll 305c for receiving a strip, midway between them.
  • the reference numeral 306 represents a gear fixed at one end of the main shaft, and 307 : a driving shaft journaled on the supporting frame 302a in the vicinity of one end of the main shaft, and having a gear 308 fixed on its middle portion for engagement with the said gear 306, whose end is to be mechanically connected with a universal joint (not shown) of a driving unit, respectively.
  • the reference numeral 309 represents an adjustment shaft mounted running through the inner hollow portion of the main shaft, 310a, 310b : a pair of threaded portions provided on both the ends of the said adjustment shafts, different in the threading direction, 311a, 311b : screw-movers screw-engaged on both the threaded portions so as to be capable of being screw-advanced or retreated thereon, respectively, 312a, 312b : transmissiom mechanisms placed between one screw-mover and one roll holder and between the other screw-mover and the other roll holder, respectively, 313 : a handle for manual rotation fixed at the other end of the adjustment shaft, and 314a, 314b : moving quantity indicating degital gauges provided between the supporting frames and the said transmission mechanisms, respectively.
  • the position retaining means 304a, 304b provided in the roll holders 303a, 303b each comprises an oil-hydraulic reduction mechanism for reducing their inner periphery, in which an annular oil pressure cell 341a, 341b running along the inner periphery of the roll holder 303a, 303b is provided in the inside of the peripheral wall of the roll holder very nearly to its inner peripheral surface, and composed so as to be supplied with an oil pressure from the outside, wherein by the same oil pressure, the thin reduction portion 342a, 342b constituting the inner wall of the oil pressure cell is expanded toward the main shaft 301 so as to be pressed against the periphery of the main shaft 301.
  • the roll holders 303a, 303b each has a flange 331a, 331b provided at its inner end, and annular split forming rolls 305a, 305b each is fixed on the said flanges by screws.
  • the adjustment shaft 309 is mounted at both the ends of the main shaft 301 by way of bearings 391a, 391b so as to be rotatable, but immobile in the axial direction.
  • precision screws may be preferably used for the screw-engagement of the threaded portions 310a, 310b of the adjustment shaft 309 with the screw-movers 311a, 311b.
  • the transmission mechanisms 312a, 312b are composed so that a cylindrical rotary joint 422a, 422b is mounted on the outer periphery of the outer end of each roll holder 303a, 303b by way of a bearing 421a, 421b, so as to be rotatable, but immobile in the direction of the cylinder, a bar 423a, 423b projecting inward is put and fixed or the outer periphery of the screw-mover 311a, 311b, and a pair of supporting cylinders 321a, 321a, 321b, 321b are provided in parallel to the main shaft 301 on both the wings of each of the supporting frames 302a, 302b, and rods 424a, 424a, 424b, 424b are slidably provided running through each of these supporting cylinders, and one end of each of these rods is connected with both the ends of the said bars 423a, 423a, 423b, 423b and the other end thereof with both the wings
  • the rotary joints 422a, 422a, 422b, 422b have an oil passage 343a, 343b leading to the oil pressure cell 341a, 341b of the said oil-hydraulic reduction mechanism, and the said oil passages are connected with an oil hose (not shown) leading to an external oil-hydraulic device.
  • the handle 313 may be preferably rotated clockwise or counterclockwise, with watching the digital gauges 314a, 314b, after the oil pressure supplied to the position retaining means 304a, 304b, i.e, the oil-hydraulic reduction mechanisms is shut down. Then, the adjustment shaft 309 is rotated so that two screw-movers 311a, 311b screw-engaged with the threaded portions at both the ends of the said adjustment shaft are screw-advanced or retreated mutually in the reverse directions.
  • the oil pressure is supplied to the oil pressure cells 341a, 341b of the oil-hydraulic reduction mechanisms that are the position retaining means 304a, 304b, and by the same oil pressure, the thin reduction portions 342a, 342b are reduced so as to be constrained in position with respect to the main shaft 301.
  • the rotating force from the driving unit is transmitted to the driving shaft 307 by way of a universal joint (not shown), and further transmitted to the main shaft 301 by way of the gears 308, 306 and to the split forming rolls 305a, 305b by way of the roll holders 303a, 303b.
  • the split roll of the illustrated example in Fig.41 and Fig.42 is an upper roll.
  • the said upper roll and a down roll are merely different in the contour of their roll periphery, and the adjusting device can be applied to either of the upper and down split rolls.
  • the reference numeral 501 represents a main shaft, and this main shaft is formed by putting an outer cylinder shaft 503 rotatably on the outer periphery of a core shaft 502.
  • Screw shafts 504, 504 which are mutually in a reverse screw relation are provided projectingly in the direction of their elongation from the centers of both the right and left end surfaces of the said core shaft 502.
  • Nuts 505, 505 are screw-engaged on both these screw shafts 504, 504, and a handle 506 for rotation of the core shaft is attached on one of the screw shafts.
  • both the right and left portions of the main shaft 501 are fixed on supporting plates 510, 510.
  • the said supporting plate each is constituted by a portion of a stand thereof, and for the upper roll, by a suspension plate hung dwon from a stand thereof, respectively.
  • a pair of right and left sliding sleeves 515, 515 are put on the middle portion of the main shaft between the supporting plates 510, 510 so as to be slidable in the axial direction. These sliding sleeves are made to be positionable at an optional position with respect to the outer cylinder shaft 503.
  • oil-hydraulic reducible sleeves wherein the oil pressure cell 516 provided on the inner peripheral side of each sleeve is pressurized to reduce the bore portion thereof so that the outer cylinder shaft 503 is clamped and fixed, or the oil pressure is decreased to restore the sleeve bore portion so that the sleeve becomes slidable again.
  • the said sliding sleeves 515, 515 have split rolls 520, 520 put rotatably on their outer peripheries, respectively.
  • a bearing 525 is made to intervene between the split roll and the sliding sleeve.
  • the said sliding sleeves 515, 515 and the abovementioned nuts 505, 505 are connected with each other by rods 530...
  • Engaging plates 531, 532 are protruded from the outer ends of the sliding sleeves and from the portions of the nuts, respectively, and the said rods are connected running through the supporting plates 510, 510 by way of these engaging plates.
  • the reference numerals 535, 535 represent linear sensers attached on the right and left supporting plates 510, 510, which serve to measure the lateral sliding quantity of the split rolls.
  • Precision screws such as ball screws may be preferably adopted for the said screw shafts and nuts, thereby eliminating backlash.
  • the present invention has the abovementioned constitution in which a main shaft 501 is formed by putting an outer cylinder shaft 503 rotatably on the outer periphery of a core shaft 502, both the right and left portions of the main shaft 501 are fixed on supporting plates 510, 510, and screw shafts 504, 504 which are mutually in a reverse screw relation are provided projectingly from the centers of both the end surfaces of the said core shaft 502 and nuts 505, 505 are screw-engaged with the said screw shafts 504, 504, and the said nuts and a pair of right and left sliding sleeves 515, 515 put on the middle portion of the main shaft 501 so as to be slidable in the axial direction are connected with each other by rods 530.
  • Fig. 43 shows the upper roll actuating apparatus of the first and second fin pass rolls 1F and 2F, to which the backlash eliminating means is applied.
  • the reference numeral 601 represents a pair of right and left stands, wherein first chocks 604, 604 supporting both the ends of a shaft 603 on which a down roll 602 is put are inserted in the lower portions of both these stands.
  • Long holes are vertically provided in the upper portions of the stands above these first chocks, and second chocks 607, 607 supporting both the ends of a shaft 606 on which an upper roll 605 is put are inserted movably up and down in the lower portions of these long holes.
  • Screw shafts 608, 608 are provided standingly through the insides of the stands from the top surfaces of the second chocks, and screw pipes 609, 609 are screw-engaged with the upper portions of the said screw shafts.
  • the said screw pipe runs through the inside of the upper portion of the stand, with its upper portion projected upward out of the stand.
  • a worm wheel 610 is put and fixed on the outer periphery of the lower portion of the said upward projected portion.
  • the said worm wheel is surrounded by a box 611, and a retaining ring 612 put and fixed on the outer periphery of the upper portion of the screw pipe above the worm wheel is mounted on the box.
  • Worms put on both the sides of a worm shaft 613 are engaged with the said worm wheel, and they constitute worm jacks 614, 614.
  • the worm jacks are made operable by a reversible motor 616 fixed on an arm 615 projected from the side portion of the stand.
  • Fluid-hydraulic cylinders 617, 617 are provided standingly from the said boxes 611, 611, and the lower ends of the piston rods 618, 618 of the said cylinders are connected with the upper ends of the screw shafts, whereby the upper roll 605 can be pulled up by way of the screw shafts 608, 608, with the lift of the pistons 619, 619.
  • Fig. 3 shows the upper roll actuating apparatus of the center bending rolls, to which the backlash eliminating means is applied.
  • Brackets 626, 626 are provided standingly from the beams 23, 23 of the upper roll stand so as to bear a worm shaft 613, and one of the said brackets supports a reversible motor 616 so that the worm shaft is rotatable thereby.
  • a worm jack 614 is provided on the middle portion of the worm shaft 613, and placed on a bed plate 627 installed between the beams.
  • a suspension base plate 628 is hung at the lower end of the screw shaft 608, and both the ends of a shaft 606 on wich upper rolls 14, 15 are put are journaled in the lower portions of arms 629, 629 hung down from both the right and left sides of the said base plate.
  • the lower ends of fluid-hydraulic cylinders 617, 617 are fixed on both the right and left sides of the said bed plate 627, and the lower ends of the piston rods 618, 618 of the said cylinders are connected to both the right and left sides of the suspension base plate 628 so as to be capable of being pulled up.
  • the present device has the abovementioned constitution.
  • the fluid-hydraulic cylinders 617, 617 are provided above the screw shaft 608, 608 for moving the upper roll put-on shaft 606 up and down, and the lower ends of the piston rods 618, 618 of the said cylinders are connected to the upper ends of the said screw shafts 608, 608, so that the upper roll 605 can be pulled up. Accordingly, there is no need of labor at the time when the stand on the movable side is pulled out for exchange of the upper roll as in the prior arts.
  • both the ends of the upper roll put-on shaft 606 are journaled in the arms 629, 629 of the suspension base plate 628, the suspension base plate is made movably up and down by the worm jack 614 and the same suspension base plate is made to be capable of being pulled up by the fluid-hydraulic cylinders separately provided. Accordingly, the fluid-hydraulic cylinders are not any obstacle to the exchange of the upper roll.
  • Fig.44 to Fig.46 are illustrative views showing the modification examples of the cage rolls.
  • the cage rolls CR ⁇ , CR ⁇ serve to apply lateral pressure to the pipe edge portions and pipe side portions from both the sides so that the boundaries between the pipe side portions and pipe bottom portion are gradually bent in excess of the finally formed circle and the pipe bottom portion is gradually bent almost equally to the finally formed circle or slightly in excess. Accordingly, the pipe which has passed this bending step becomes oval in cross section.
  • each cage roll CR ⁇ As to the cage rolls CR ⁇ , however, a total of twelve rolls are arranged on both sides in four zones, three rolls in each zone, and as shown in Fig.44, they serve to properly apply forces to the pipe edge portions and pipe side portions from the outsides so that the boundaries between the pipe side portions and pipe bottom portion and the pipe bottom portion are bent in order, with restraining the spring-back.
  • the three cage rolls in each zone are mounted in one roll stand 723 ⁇ and in each of these roll stands, each cage roll has an advance and retreat control means 724, a lift control means 725 and an angle adjustment means 726 provided individually therein.
  • the roll surface of a cage roll is shaped in the form of a concavely curved face having a larger radius of curvature than that of a forming flower at its own position, the roll surface can be suitably fitted to the convexly curved face of the forming flower. Accordingly, it is possible to prevent the surface of a welded pipe from being made flat in a stripe-pattern, and it is further possible to make its appearance good, and to improve its quantity.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

Afin d'assurer les différentes étapes d'un procédé de laminage, un appareil comprend des rouleaux de laminage agencés successivement, un rouleau de repliage qui retient par laminage le matériau dont se compose un tube par une partie qui s'étend d'un bord jusqu'à une jonction avec une partie latérale du matériau, le matériau étant replié; un premier rouleau médian de cintrage qui retient par laminage la partie latérale du matériau dont se compose le tube afin de le cintrer; des deuxième, troisième et quatrième rouleaux médians de cintrage qui retiennent par laminage une jonction entre la partie latérale et une partie inférieure du matériau dont se compose le tuyau, de façon à replier la partie latérale sur la partie inférieure du matériau et à appliquer une pression latérale sur le matériau, depuis des côtés opposés, de façon à replier la jonction sur la partie inférieure du matériau; une pluralité de rouleaux de suspension agencés des deux côtés desdits rouleaux; et des premier et deuxième rouleaux de finition qui façonnent par laminage le matériau dont se compose le tube. Des organes d'entraînement sont prévus pour au moins le rouleau de repliage, le premier rouleau médian de cintrage et les premier et deuxième rouleaux de finition. En outre, tous les rouleaux supérieurs parmi les quatre rouleaux médians de cintrage sont agencé dans un logement et tous les supports inférieurs des quatre rouleaux médians de cintrage ou tous les supports inférieurs des deuxième, troisième et quatrième rouleaux médians de cintrage sont agencés sur une plaque commune de support.
EP90917533A 1989-12-04 1990-12-04 Appareil de fabrication de tubes en acier soude Expired - Lifetime EP0607430B1 (fr)

Applications Claiming Priority (11)

Application Number Priority Date Filing Date Title
JP314696/89 1989-12-04
JP1314694A JPH0636943B2 (ja) 1989-12-04 1989-12-04 無駆動成形ロールの調整装置
JP314694/89 1989-12-04
JP1314696A JPH03174922A (ja) 1989-12-04 1989-12-04 溶接管のケージロール
JP89317289A JPH03180211A (ja) 1989-12-06 1989-12-06 溶接管成形装置
JP3172/89 1989-12-06
JP3172/90 1989-12-06
JP1317290A JPH06104252B2 (ja) 1989-12-06 1989-12-06 溶接鋼管の製造装置
JP2306297A JPH0698402B2 (ja) 1990-11-14 1990-11-14 溶接鋼管の帯板縁部成形ロール
JP306297/90 1990-11-14
PCT/JP1990/001572 WO1991008064A1 (fr) 1989-12-04 1990-12-04 Procede et appareil de fabrication de tubes en acier soude

Publications (3)

Publication Number Publication Date
EP0607430A4 EP0607430A4 (fr) 1992-02-07
EP0607430A1 true EP0607430A1 (fr) 1994-07-27
EP0607430B1 EP0607430B1 (fr) 1996-07-10

Family

ID=27551794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90917533A Expired - Lifetime EP0607430B1 (fr) 1989-12-04 1990-12-04 Appareil de fabrication de tubes en acier soude

Country Status (1)

Country Link
EP (1) EP0607430B1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011016173A1 (de) 2011-04-05 2012-10-11 Bergrohr Gmbh Siegen Blechbiegemaschine, Verwendung einer solchen zur Herstellung von Schlitzrohren sowie Verfahren zur Formung eines Bleches zu einem Schlitzrohr
CN105598194A (zh) * 2016-03-15 2016-05-25 丽水市海卓科技有限公司 自动拉丝流水线及其工艺
CN106180231A (zh) * 2016-07-29 2016-12-07 南通汇丰电子科技有限公司 一种拉拔模具及金属线的拉拔系统
US9625067B2 (en) 2009-09-01 2017-04-18 Sea Ng Corporation Clamp suitable for increasing the fatigue life of the butt welds of a pipe pressure vessel which is subsequently bent
CN115635239A (zh) * 2022-09-07 2023-01-24 江苏新蓝天钢结构有限公司 一种束状钢管异形柱组装和辅助焊接装置及组装焊接方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105499339B (zh) * 2016-01-13 2018-01-12 大连三高集团有限公司 一种予弯成型装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9108064A1 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9625067B2 (en) 2009-09-01 2017-04-18 Sea Ng Corporation Clamp suitable for increasing the fatigue life of the butt welds of a pipe pressure vessel which is subsequently bent
DE102011016173A1 (de) 2011-04-05 2012-10-11 Bergrohr Gmbh Siegen Blechbiegemaschine, Verwendung einer solchen zur Herstellung von Schlitzrohren sowie Verfahren zur Formung eines Bleches zu einem Schlitzrohr
WO2012136187A1 (fr) 2011-04-05 2012-10-11 Bergrohr Gmbh Siegen Plieuse pour tôle, utilisation d'une telle plieuse pour la fabrication de tube fendu et procédé de mise en forme d'une tôle pour former un tube fendu
CN105598194A (zh) * 2016-03-15 2016-05-25 丽水市海卓科技有限公司 自动拉丝流水线及其工艺
CN106180231A (zh) * 2016-07-29 2016-12-07 南通汇丰电子科技有限公司 一种拉拔模具及金属线的拉拔系统
CN115635239A (zh) * 2022-09-07 2023-01-24 江苏新蓝天钢结构有限公司 一种束状钢管异形柱组装和辅助焊接装置及组装焊接方法

Also Published As

Publication number Publication date
EP0607430B1 (fr) 1996-07-10
EP0607430A4 (fr) 1992-02-07

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