EP1618972A1 - Tête de roulage de tubes, machine à former des tubes comprenant la dite tête et procédé de contrôle de la dite machine - Google Patents

Tête de roulage de tubes, machine à former des tubes comprenant la dite tête et procédé de contrôle de la dite machine Download PDF

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Publication number
EP1618972A1
EP1618972A1 EP04425533A EP04425533A EP1618972A1 EP 1618972 A1 EP1618972 A1 EP 1618972A1 EP 04425533 A EP04425533 A EP 04425533A EP 04425533 A EP04425533 A EP 04425533A EP 1618972 A1 EP1618972 A1 EP 1618972A1
Authority
EP
European Patent Office
Prior art keywords
head
pipe
roll
rolls
holders
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.)
Withdrawn
Application number
EP04425533A
Other languages
German (de)
English (en)
Inventor
Aurelio Crippa
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.)
Fabbrica Macchine Curvatubi Crippa Agostino SpA
Original Assignee
Fabbrica Macchine Curvatubi Crippa Agostino SpA
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
Application filed by Fabbrica Macchine Curvatubi Crippa Agostino SpA filed Critical Fabbrica Macchine Curvatubi Crippa Agostino SpA
Priority to EP04425533A priority Critical patent/EP1618972A1/fr
Publication of EP1618972A1 publication Critical patent/EP1618972A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/04—Forming single grooves in sheet metal or tubular or hollow articles by rolling
    • 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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/04—Reducing; Closing

Definitions

  • the present invention relates to a pipe-rolling head, to a machine for shaping pipes comprising said head, and to a control method for said machine.
  • Rolling is a particular working obtained by cold deformation carried out by means of a head provided with three rolls idly mounted on a rotating support and disposed around a predetermined axis which is coincident with the longitudinal axis of a pipe to be rolled.
  • Each roll has a ridge on its circumferential surface the shape of which matches that of the impression to be formed in the pipe.
  • the end of the pipe clamped by an appropriate vice is enclosed in the three rolls and only subsequently the rolls are driven in rotation around the longitudinal axis of the pipe through rotation of the rotating support.
  • the roll pressure combined with the rotational motion of the head gives rise to the desired impression in the pipe end.
  • the pneumatic system comprises a thrust element (A) disposed around a rotation shaft (B) of the rolling head and movable in translation along the longitudinal axis (C).
  • the thrust element is moved forward by admitting air under pressure through a duct (D) delimited by the thrust element itself.
  • the thrust element on the opposite side from the pressurised duct, has a sloping surface (E) on which three wheels (F) rest, each wheel being connected to a respective shaping roll (G).
  • each roll is further provided with a stop of the mechanical type (L) abutting against a spacer (M) mounted in the vicinity of the longitudinal axis.
  • the rolls are mounted in a removable manner on carriages (N) rigidly connected to the arms carrying the wheels, so that the position of each roll in relation to the carriage carrying it can be varied.
  • the above described rolling head of known type allows working of the pipe to be started only after the rolls are closed around the pipe. Therefore, the impression left in the pipe is exclusively determined by the geometry of the side surface of the rolls adopted therein and, possibly, by the greater or smaller approaching of the rolls to the longitudinal axis of the pipe, regulated by the mechanical stop element.
  • the technical task underlying the present invention is to devise a pipe-rolling head, a machine for pipe shaping comprising said head and a control method for said machine that are able to obviate the mentioned drawbacks.
  • a pipe-rolling head in accordance with the present invention is denoted by reference numeral 1.
  • Head 1 is mounted on a machine designed to shape the ends of pipes.
  • the machine of known type and therefore not shown or described in detail, comprises suitable means capable of clamping a pipe 2 to be worked, such as a vice.
  • One end of pipe 2 clamped in the vice faces a tool assembly mounted on a base frame of the machine.
  • the tools, among which the rolling head 1 are moved so as to face the vice in sequence, in order to carry out different types of machining operations on the end of pipe 2 through cold deformation and/or material removal.
  • Head 1 once it is positioned in front of the vice, is actuated by actuating means "M" of known type and only diagrammatically shown in Fig. 1, along a rolling axis "X". Head 1 carries out a translation between a position at which it is moved close to the vice and a position at which it is spaced apart therefrom, so as to be positioned at an axial portion of the end of pipe 2 designed to be machined.
  • Head 1 comprises a rotating body 3 being set in rotation around the rolling axis "X" which is coincident with the longitudinal axis of pipe 2, by dedicated means 4 comprising a main motor 4a connected to the rotating body 3.
  • the rotating body 3 externally is of a cylindrical shape the base 3a of which, when head 1 is brought in front of the pipe 2 (Fig. 2) retained by the vice, faces the vice itself.
  • Rolls 6 freely rotate around respective rotation axes "Y” substantially parallel to the rolling axis "X”.
  • each roll 6 is rotatably coupled, through a ball bearing for example, with a respective stem 7 integral with a roll-holder 5.
  • Each roll 6 has one or more raised portions 6a on its circumferential side surface, said raised portions being designed to leave their impression on the pipe 2 to be submitted to rolling.
  • Rolls 6 can be replaced by other rolls having different features depending on the type of impression it is necessary to leave on pipe 2.
  • the three roll-holders 5 carry out a translation relative to the rotating body 3 between an open position at which rolls 6 lie spaced apart from each other and from the rolling axis "X" and a closed position at which rolls 6 lie close to each other in the vicinity of the rolling axis "X" to encompass the pipe 2 to be rolled.
  • a pin 8 is installed in a removable manner on the rotating body 3 and extends along the rolling axis "X", which is coincident with the longitudinal axis of the rotating body 3, between rolls 6.
  • the radial sizes of pin 8 are adapted to enable housing of same into the pipe 2 to be machined, so as the perform the function of counteracting the pressure exerted by rollers 6. Pin 8 too can be replaced and it is selected based on the inner sizes of pipe 2.
  • Actuating means 9 moves the roll-holders 5 between the open and closed positions.
  • head 1 being the object of the invention further comprises a control device 10 of the CNC (an acronym meaning Computerised Numerical Control) type, diagrammatically shown in Fig. 1 and interlocked with the actuating means 9 to move the roll-holders 5 between the open and closed positions so as to automatically control opening and closing of said roll-holders 5.
  • CNC Computerised Numerical Control
  • the roll-holder actuating means 9 comprises an auxiliary motor 11 and a mechanical member 12 connected to the auxiliary motor 11 and the roll-holders 5 to transmit the motion imparted by motor 11 to the roll-holders 5.
  • the CNC control device 10 is connected to the auxiliary motor 11.
  • the CNC control device 10 is further connected to the main motor 4a to also control rotation of the rotating body 3 and of the means "M" for actuating head 1.
  • the control carried out by the CNC device 10 enables the head actuating means "M", the auxiliary motor 11 and main motor 4a to be suitably controlled and the movements of head 1 and rolls 6 to be combined, in order to obtain particular types of machining as described in the following.
  • the mechanical member 12 connected to the auxiliary motor 11 and the roll-holders 5 comprises at least one ball-bearing actuator 13 (Fig. 2).
  • the ball-bearing actuator 13 has a single lead screw 14 coaxial with the rolling axis "X" and a lead screw nut 15 rotatably engaged on the lead screw 14.
  • the lead screw 14 is prevented from rotating, is movable in translation along the rolling axis "X” and is kinematically connected to the roll-holders 5.
  • the auxiliary motor 11 (Fig. 1) connected to the lead screw nut 15 drives the lead screw nut 15 in rotation and causes translation of screw 14.
  • the mechanical member 12 connected to the auxiliary motor 11 and the roll-holders 5 further comprises a motion-transmitting member 16 installed close to a first end 14a of the lead screw 14 and coupled with the roll-holders 5 to convert translation of the lead screw 14 along the rolling axis "X" into a movement of the roll-holders 5 between the open and closed positions (Fig. 2).
  • head 1 has a casing 17 inside which the lead screw nut 15 is rotatably housed, being supported by roller and/or ball bearings 18.
  • the casing 17 does not rotate but carries out a translation relative to the base frame of the machine moved by the above mentioned actuating means "M" to take a position close to the axial portion of the end of pipe 2 designed to be machined.
  • the rotating body 3 is rotatably coupled, through respective bearings 19 of the roller type for example, with the casing 17, and the lead screw 14 carries out a translation movement both in the casing 17 and in the rotating body 3.
  • the lead screw nut 15 on its outer circumferential surface has a toothing 20 in which a flexible transmission element 21, preferably a chain trained around a shaft 22 of the auxiliary motor 11, is engaged to transmit motion from the auxiliary motor 11 to the lead screw nut 15 (Figs. 1 and 3).
  • a transmission 23 interposed between the main motor 4a and the rotating body 3 allows motion to be transmitted from said main motor 4a to said rotating body 3.
  • the rotating body 3 is provided with a toothing 24 around which a flexible element 25 is partly wrapped, a toothed belt for example, also passing over a shaft 26 of the main motor 4a.
  • the motion-transmitting member 16 comprises a support element 27 for each of the roll-holders 5 which is mounted on the rotating body 3 and is movable along a respective direction "Z" orthogonal to the rolling axis "X".
  • each support element 27 is slidably inserted in a groove 28 having a radial extension and formed in the rotating body 3 (Figs. 1 and 3).
  • grooves 28 are spaced apart the same distance from each other through an angle of 120° and open on base 3a of the rotating body 3 to enable each support element 27 to carry the respective roll-holder 5 in cantilevered fashion (Fig. 1).
  • the motion-transmitting member 16 further comprises a coupling element 29 mounted on the first end 14a of the lead screw 14 within the rotating body 3.
  • the motion-transmitting member 16 is slidably associated with the support element 27 along a respective sloping surface 30 inclined relative to the rolling axis "X". In the embodiment shown, the sloping surfaces 30 converge towards the rolling axis "X" and towards each other moving away from the first end 14a of the lead screw 14.
  • the coupling element 29 is rotatably mounted on the lead screw 14 and rotates together with the rotating body 3.
  • the coupling element 29 comprises a cylindrical body 31 coaxial with the lead screw 14 (Fig. 3) and coupled therewith by means of bearings 32 (Fig. 2).
  • the cylindrical body 31 has at least three slits 33 formed at a side surface thereof, which slits 33 extend over the whole height of the cylindrical body 31 along a direction substantially parallel to the rolling axis "X".
  • Each slit 33 further has a varying depth to define a respective sloping surface 30, and slidably receives a respective support element 27 extending along a radial direction relative to the rolling axis "X".
  • Each slit 33 is such shaped as to be able to exert both a thrust action away from the rolling axis "X" and a pulling action close to the same axis "X", on the support element 27.
  • each slit 33 has, seen in cross-section relative to the rolling axis "X", a T-shaped conformation, in which the upper horizontal segment of the "T" faces the rolling axis "X".
  • the sloping surface 30 of each slit 33 is therefore formed of the bottom surface 30a of the slit 33 itself and of two auxiliary surfaces 30b of said slit 33 facing the bottom surface 30a.
  • each support element 27 has an end 27a the shape of which matches that of the slit 33 and which is housed in the slit 33 itself.
  • the cylindrical body 31 is installed in a hollow space 3b formed in the rotating body 3 the size of which, parallel to the rolling axis "X", is bigger than the axial size of the cylindrical body 31, to enable translation of the cylindrical body 31 itself together with the lead screw 14.
  • head 1 is moved forward by the actuating means "M" of the machine towards pipe 2 to be rolled which is clamped by the vice and the rolling axis "X" of which is coincident with the longitudinal axis of pipe 2 and of the roll-holders 5 in the open position.
  • the lead screw 14 In the open position, the lead screw 14 lies in a backward position at which the first end 14a of said screw and the cylindrical body 31 are axially spaced apart from the roll-holders 5. With reference to the section view of the head in Fig. 2, the backward position corresponds to displacement to the left of screw 14.
  • the auxiliary motor 11 driven by the CNC control device 10 causes rotation of the lead screw nut 15 in a predetermined direction, so as to make the lead screw 14 and the cylindrical body 31 move forward towards the roll-holders 5 (to the right in Fig. 2).
  • the main motor 4a drives the rotating body 3 in rotation to enable rolls 6 to roll on pipe 2 and leave their impression on the outer surface of the pipe 2 itself.
  • control through a CNC device advantageously allows rolls 6 to be closed on pipe 2 and the rotating body 3 to rotate while the head 1 is still moving forward, thereby combining the three movements during the working process to carry out a dynamic shaping of the end of pipe 2.
  • the shape of pipe 2 is not only a function of the geometry of the side surface of the rolls 6 therein adopted, but is also a function of the combination/interpolation of the movements of head 1, of rolls 6 and of the rotating body 3 controlled by the programmable control device 10 of the CNC type.
  • the head 1 being the object of the invention is in any case able to perform the same steps in succession as the pneumatic head of known type, i.e. to first move forward head 1 to cause arrangement of rolls 6 around the end of pipe 2, to subsequently close rolls 6 on pipe 2 and to ultimately start rotation of the rotating body 3 to carry out a traditional rolling.
  • the auxiliary motor 11 rotates the lead screw nut 15 in the opposite way and moves the lead screw 14 and the cylindrical body 31 backwards (to the left in Fig. 2).
  • the backward movement of the cylindrical body 31 makes the support elements 27 move away from the rolling axis "X".
  • the radial translation of the support elements 27 away from the rolling axis "X” is caused by the thrust action exerted by the bottom surface 30a of groove 33 on the ends 27a of the support elements 27 themselves (Fig. 3).
  • the invention achieves important advantages.
  • rolling operations on pipes of different diameters or rolling operations with different impression depths on the same pipes can be carried out, without dismantling and repositioning of head elements being required, to adapt the stroke of rolls 6 towards the rolling axis to the type of pipe or of working.
  • the radial displacement of the rolls is fully controlled by the CNC device.
  • the machine for shaping pipes in accordance with the present invention enables more complicated working operations to be carried out as compared with those obtainable with the rolling heads of the known art, due to the possibility of combining and controlling all movements of the head and the rolls.
  • the head of the invention is able to carry out rolling with very narrow tolerances, which is presently more and more required by users of shaped pipes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP04425533A 2004-07-19 2004-07-19 Tête de roulage de tubes, machine à former des tubes comprenant la dite tête et procédé de contrôle de la dite machine Withdrawn EP1618972A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04425533A EP1618972A1 (fr) 2004-07-19 2004-07-19 Tête de roulage de tubes, machine à former des tubes comprenant la dite tête et procédé de contrôle de la dite machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425533A EP1618972A1 (fr) 2004-07-19 2004-07-19 Tête de roulage de tubes, machine à former des tubes comprenant la dite tête et procédé de contrôle de la dite machine

Publications (1)

Publication Number Publication Date
EP1618972A1 true EP1618972A1 (fr) 2006-01-25

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EP04425533A Withdrawn EP1618972A1 (fr) 2004-07-19 2004-07-19 Tête de roulage de tubes, machine à former des tubes comprenant la dite tête et procédé de contrôle de la dite machine

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EP (1) EP1618972A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102921822A (zh) * 2012-11-07 2013-02-13 卓旦春 一种阀门缩口装置
CN109676043A (zh) * 2019-02-25 2019-04-26 廊坊中德汽车座椅制造有限公司 汽车座椅头枕杆的缩口装置
CN111633078A (zh) * 2020-06-17 2020-09-08 南京航空航天大学 一种超薄壁弯管旋弯成形方法及装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000190031A (ja) * 1998-10-13 2000-07-11 Toyota Motor Corp 絞り加工方法および絞り加工装置
US6216512B1 (en) * 1993-11-16 2001-04-17 Sango Co., Ltd. Method and apparatus for forming a processed portion of a workpiece
US6233993B1 (en) * 1999-05-10 2001-05-22 Sango Co., Ltd. Method and apparatus for forming a processed portion of a workpiece

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6216512B1 (en) * 1993-11-16 2001-04-17 Sango Co., Ltd. Method and apparatus for forming a processed portion of a workpiece
JP2000190031A (ja) * 1998-10-13 2000-07-11 Toyota Motor Corp 絞り加工方法および絞り加工装置
US6233993B1 (en) * 1999-05-10 2001-05-22 Sango Co., Ltd. Method and apparatus for forming a processed portion of a workpiece

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 10 17 November 2000 (2000-11-17) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102921822A (zh) * 2012-11-07 2013-02-13 卓旦春 一种阀门缩口装置
CN102921822B (zh) * 2012-11-07 2016-03-02 卓旦春 一种阀门缩口装置
CN109676043A (zh) * 2019-02-25 2019-04-26 廊坊中德汽车座椅制造有限公司 汽车座椅头枕杆的缩口装置
CN111633078A (zh) * 2020-06-17 2020-09-08 南京航空航天大学 一种超薄壁弯管旋弯成形方法及装置
CN111633078B (zh) * 2020-06-17 2021-05-25 南京航空航天大学 一种超薄壁弯管旋弯成形方法及装置

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