JP2000301233A - Orthogonal roll train forming device for square tube production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an orthogonal roll train forming device for square tube production capable of coping with changes of the dimensions of tube stocks and square tubes only by adjusting roll positions and roll gaps. SOLUTION: A plurality of sets of horizontal rolls 8nb, 8nc having the same surface shape per each pair and a plurality of sets of vertical rolls 9mb, 9mc are arranged so that the centers of roll gaps of the roll pairs are located on one horizontal line H1 and further the horizontal pairs and vertical pairs are alternately disposed along the horizontal line with their roll axial centers oriented orthogonally to the horizontal line. The curvatures of surface shapes of the horizontal/vertical roll pairs viewed in the roll axial direction are reduced from one end of the arrangement to the other end step-wise. By using an integrated roll setting position change numerical control mechanism, the roll gaps of the horizontal pairs and the vertical roll pairs are changed to prescribed gaps, and required square tubes having different longitudinal/lateral dimensions of cross sectional faces are arbitrarily produced from tube stocks having a prescribed outer diameter without changing rolls at all.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for forming a circular tube into a square tube, and in particular, efficiently and in a variety of small quantities in response to the required diversification of dimensions of the square tube. In order to be able to manufacture a square tube, the roll group used for forming is constituted by a plurality of pairs of horizontal rolls and a plurality of pairs of vertical rolls which are alternately arranged in the traveling direction of the tube, and these forming rolls Are completely combined, and the forming rolls are divided into several groups, each group is assembled into a common support frame, and each group is assembled using a set position change numerical control mechanism. The position of the roll and the vertical and horizontal roll gaps are changed, and the required circular pipe is fed through the changed roll gap, punched or pulled out, and the required deformation is applied to the circular pipe to form the required square pipe. With this method, it is possible to form square tubes having different sizes from circular tubes having different sizes with arbitrarily high productivity without completely changing the forming rolls. The present invention relates to a row forming apparatus.

[0002]

2. Description of the Related Art The process of forming a circular tube into a square tube having a square cross section or a rectangular cross section as a raw tube has been widely adopted as an important means for manufacturing a square tube. As shown in FIG. 1, the process of forming this circular pipe is such that a pair of upper and lower horizontal rolls 10a and 10b and a pair of right and left vertical rolls 20a and 20b, which are driven or not driven, have their axes on the same plane. This is performed using a so-called four-roll forming roll composed of a set of four rolls arranged in a manner as described above. Using up to 6 stands, the horizontal roll pair and the vertical roll pair incorporated in each stand are aligned and arranged so that the vertical and horizontal centers of the roll gaps are on a horizontal straight line. A method is used in which a circular tube is sent downstream through a gap formed by the set of four rolls of the forming stand in which the circular tube is arranged, and the circular tube is deformed to a required shape and sequentially formed into a square tube. It has been. FIG. 2 shows one of the application examples.
In this case, the circular pipe 60, which is a raw pipe, is gripped at its end by the ram 40 of the hydraulic cylinder 30 via a tightening means such as a chuck, and is pressed by the hydraulic cylinder 30 for forming. It is fed into the roll gap of the forming roll stand group (in the direction of the arrow in FIG. 2) and undergoes forming processing. In the case shown in FIG. 2, the row of forming stands used is the No. for starting the forming of a circular tube toward a square tube.
No. 1 forming roll stand and built-in roll group 50a, and then No. 1 for further forming. No. 2 forming roll stand and built-in roll group 50b, and No. 2 for final forming into square tube 70 having final square and rectangular cross sections. 3 Forming roll stand and built-in roll group 5
0c, and the built-in forming roll is, for example, the aforementioned No. 0c. In the case of one forming roll stand, it is composed of a set of four rolls of an upper horizontal roll 10c, a lower horizontal roll 10d, and a pair of left and right vertical rolls 20c, 20d. No. 2, No. The same applies to the configuration of the forming roll in the three forming roll stand. In addition, in addition to the above, there is a case where a pinch roll stand for continuously feeding a raw tube or a product tube is installed on the upstream side or the downstream side of the forming roll stand row, or four pinch roll stands incorporated in each forming roll stand are provided. A forming apparatus provided with a mechanism for driving the upper and lower horizontal rolls or the left and right vertical rolls of a set of rolls is also widely used. Furthermore, the production line of so-called ERW pipes for continuously producing raw pipes and the above-mentioned pinch roll stands and forming roll stand groups are aligned and directly connected, and the production of round pipes and the formation of square pipes are completely completed. In many cases, it is performed continuously.

[0003]

However, such a conventional apparatus for forming a circular tube into a square tube has the following problems. 1) The roll must be replaced every time the dimensions of the product (square tube) change; 2). The raw pipe (circular pipe) is rapidly deformed near the roll entrance of each stand, the thrust in the required forming direction is likely to increase, and slip between the forming roll and the raw pipe due to insufficient thrust is easy to occur. The problem of instability of the forming speed of the line accompanying this is likely to occur. 3) Since the deformation of the raw tube (circular tube) is concentrated immediately before and immediately below the roll, the shape is formed on the side of the cross section of the formed square tube. Depression is likely to occur as a defect, which deteriorates the flatness of the sides and lowers the product quality. 4) Deformation tends to concentrate on the corners (corners) of the cross section of the product (square tube). Strong, easy to generate large residual strain and residual stress at corners In addition, defects such as cracks on the outer surface or inner surface of the corner are easily generated. In particular, the problem 1) is the most important problem relating to the manufacture of square tubes, and with the diversification of needs in recent years, the need to manufacture many types of square tubes having different dimensions in small quantities has increased, Highly productive manufacturing technology that can handle small-lot production, especially roll-over technology to reduce roll costs, which significantly increases with the variety of product dimensions, and roll change time due to changes in product dimensions There is a strong demand for the development of radical shortening technology. In fact, many attempts have been made to produce square pipes that can meet such demands, but there has been no successful case of using a forming roll that can cope with large changes in product dimensions. Attempts have been made to use some forming rolls for unavoidable reasons, knowing that they are inappropriate, and to develop and use quick change technology for forming rolls. Regarding the problem 4), a large compressive strain in the circumferential direction of the cross-section is applied to the corners (corners) of the cross-section of the square tube in addition to the bending strain at the time of molding, and a large residual stress caused by these deformations This causes an increase in the yield ratio of the corners and causes cracks. In order to avoid the problem caused by the residual stress, molding by heating has been attempted, but conversely, the dimensional accuracy is often reduced due to the influence of thermal strain, so it is still a satisfactory solution. No solution has been found. On the other hand, the dimensional accuracy of the product (square tube) is in accordance with JIS standards, and the radius of curvature of the outer surface of the corner (corner) of the cross section is three times or less the plate thickness, and the flatness of the side is zero. There is a strict standard of 0.5% or less. Various efforts have been made to satisfy these standards, but a great deal of work is currently required to achieve the target with the conventional molding apparatus.
Furthermore, from the point of view of the manufacturing facilities for square tubes, in many cases only a relatively short line length is allowed for the process of forming round tubes into square tubes, and the minimum necessary forming rolls are included therein. It is required to efficiently manufacture various types of square tubes having sufficiently high quality using a stand. Under such constraints, there is a situation in which the amount of deformation to be applied to the raw tube in each forming roll stand must be large, and at present the above-mentioned various problems are caused.

[0004]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have repeated many studies, and as a result,
The following proposals were made. That is, the present invention provides: (1) a plurality of sets of a pair of right and left vertical rolls having the same surface shape for each pair as well as a plurality of sets of a pair of upper and lower horizontal rolls having the same surface shape for each set. Are arranged such that the upper, lower, left and right centers of each pair of roll gaps are on one horizontal straight line, and the axis of each of the rolls is orthogonal to the horizontal straight line, and the horizontal direction is along the horizontal straight line. The roll pairs and the vertical roll pairs are alternately arranged, and from one end of the arrangement to the other end, the curvature of the surface shape of the horizontal roll pairs and the vertical roll pairs as viewed in the roll axis direction is relatively small. The horizontal roll pairs and the vertical roll pairs in the last stage of the row of the roll pairs are each generally constituted by flat rolls. And a series of A circular tube is fed through a gap formed by the horizontal roll pair and the vertical roll pair, in which the shape and dimensions of the upper and lower sides and the left and right sides are gradually changed. A rectangular tube forming apparatus for producing square tubes, characterized in that square tubes having a cross section or a rectangular cross section can be continuously manufactured. (2) In the rectangular tube forming apparatus for manufacturing a square tube,
All upper horizontal rolls and all lower horizontal rolls included in the plurality of horizontal roll pairs are divided into a plurality of groups, respectively, and an upper horizontal roll group and a lower horizontal roll belonging to each of the divided groups. The groups are supported by a common support frame for each group, and the support frames are moved up and down synchronously using a preset position change numerical control mechanism provided in advance, whereby the upper horizontal roll is moved. A pipe which has a mechanism capable of arbitrarily changing a vertical roll gap between a group and the lower horizontal roll group, and which is a roll belonging to a plurality of the vertical roll pairs as well; All right rolls and all left rolls viewed in the direction of travel are divided into multiple groups, respectively.
The right vertical roll group and the left vertical roll group belonging to each of the divided groups are supported by a common support frame for each of the divided groups, and the set position change numerical control provided with each of the support frames in advance. A mechanism capable of arbitrarily changing the gap in the left-right direction between the right vertical roll group and the left vertical roll group by synchronously moving left and right using a mechanism. Roll setting position change, that is, roll gap change By using the numerical control mechanism, the vertical and horizontal roll gaps can be arbitrarily changed without changing all the built-in horizontal rolls and all the vertical rolls at all. Feed the required circular pipe with a diameter of
We have proposed an orthogonal roll row forming machine for square tube manufacturing that can arbitrarily form required square tubes having different cross-sectional dimensions. (3) Further, two horizontal flat rolls and two vertical flat rolls are incorporated on the downstream side of the row in which the plurality of horizontal roll pairs and the plurality of vertical roll pairs are alternately arranged, and These four flat rolls are arranged so that their axes are all on the same plane, and the roll gap changing numerical value which can arbitrarily change the vertical and horizontal gaps formed by the four flat rolls. At least one or more orthogonal 4-roll molding devices having a control mechanism are arranged, and at that time,
Two horizontal rolls and two horizontal rolls built in the orthogonal four-roll molding device are formed with respect to a horizontal straight line connecting the upper, lower, left and right centers of the roll gap of the rectangular tube forming device for producing square tubes.
The vertical roll row forming apparatus for square tube production, wherein the vertical rolls are arranged so that the axes of the vertical rolls are substantially vertical and the vertical and horizontal centers of the roll gap formed by the four rolls are on the horizontal straight line. And the gap formed by each roll of the orthogonal four-roll molding apparatus, the gap having a shape and size that changes stepwise along the horizontal line is determined as a required raw pipe diameter, that is, a diameter of a circular pipe. By arbitrarily changing according to the change in the shape and dimensions of the square tube, feeding the required circular tube into the changed roll gap, punching or pulling it, adding the required deformation, and forming it into the required square tube When arbitrarily manufacturing a square tube having a square cross section or a rectangular cross section having different dimensions, it is possible to arbitrarily apply a necessary compression deformation, that is, a contraction tube deformation in the circumferential direction of the raw tube and the square tube. Characteristic square tube It proposed forming a perpendicular roll train forming apparatus. (4) Among the roll groups incorporated in the rows of the horizontal roll pairs and the vertical roll pairs that are alternately arranged, and the roll groups that are built in the orthogonal four-roll molding apparatus rows that are arranged downstream of them. (1), (2), wherein a roll driving device for driving a part of rolls selected in advance is provided so that the raw tube and the product square tube can be sent by themselves.
(3) The orthogonal roll row forming apparatus for square tube production described in (3) was proposed. With the above proposals, it is possible to efficiently, accurately and arbitrarily manufacture square tubes of different sizes from circular tubes of different sizes without changing rolls, and to meet the needs of many kinds of small lots, It is possible to provide a high quality square tube while maintaining the quality. It should be noted that the orthogonal roll row forming apparatus for manufacturing square tubes according to the present invention can accurately and stably form various square tubes having different dimensions from circular tubes having various dimensions. It has been proved theoretically by deformation analysis and numerical simulation.

[0005]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 3 is a schematic view showing the configuration of a forming roll group incorporated in the rectangular roll forming apparatus for manufacturing a square tube according to the present invention, in which a plurality of horizontal roll pairs and a plurality of vertical roll pairs are formed. It is arranged alternately in the direction. The axis of the horizontal roll and the axis of the vertical roll belonging to each of the adjacent horizontal roll pairs and the vertical roll pairs are not in the same plane as in the conventional four-roll type forming rolls. The plane including the axis of the pair and the plane including the axis of the vertical roll pair are spaced apart from each other so as not to interfere with each other. Further, all upper horizontal rolls and all lower horizontal rolls belonging to the plurality of horizontal roll pairs and all right vertical rolls and left vertical rolls belonging to the plurality of vertical roll pairs are divided into a plurality of groups. ,
The horizontal roll group and the vertical roll group belonging to each group are supported by a common support frame for each group, each support frame, the roll gap formed by the horizontal roll pair and the vertical roll pair It has a roll support mechanism equipped with a set position change numerical control mechanism that can be changed and adjusted according to the dimensions of the raw tube and the product. More specifically, the rectangular roll row forming apparatus for producing square tubes according to the present invention comprises upper and lower pairs of horizontal rolls 81b, 81c, 82b, which have the same surface shape for each pair.
82c ··· 8nb, a plurality of sets of 8nc (n sets),
Vertical rolls 91b, 91c, 92b, 92c... 9 each having a left and right pair and having the same surface shape for each pair
mb, 9mc and a roll belonging to all the horizontal roll pairs and the vertical roll pairs, wherein the vertical and horizontal centers of the roll gaps of each pair are on one horizontal straight line H1. Are arranged so that their axes are orthogonal to the horizontal straight line H1, and the horizontal roll pairs and the vertical roll pairs are alternately arranged along the horizontal straight line H1, that is, the orthogonal roll rows This is a forming device that incorporates a forming roll group. And, from one end to the other end of the arrangement of the horizontal roll group forming the upper and lower pairs and the vertical roll group forming the left and right pairs, that is, from the upstream side to the downstream side when feeding the raw pipe, that is, the circular pipe, The surface shape of the horizontal roll pair and the vertical roll pair as viewed in the roll axis direction has a curvature that substantially matches the curvature of the outer peripheral surface of the circular pipe as the raw pipe on the entry side, and on the downstream side. In the final stage, the horizontal roll pair and the vertical roll pair each have a surface shape of a very small curvature, i.e., a roll substantially corresponding to a flat roll. Is used. Under such a configuration, a required circular pipe is fed through a gap between the horizontal roll pairs and the vertical roll pairs which are alternately arranged in a row, and is punched and extracted to add a required deformation to have a square or rectangular cross-sectional shape. Form into the required square tube. Furthermore, by forming using a plurality of sets of horizontal roll pairs and a plurality of sets of vertical rolls composed of flat rolls alternately arranged on the downstream side as necessary, a square or rectangular shape having higher dimensional accuracy can be obtained. It becomes possible to manufacture a square tube having a cross-sectional shape.

In the orthogonal roll row forming apparatus for manufacturing a square tube according to the present example, the number of the pair of horizontal rolls forming the upper and lower pairs and the number of the pair of vertical rolls forming the left and right pairs are each one.
It is composed of 5 or less sets and a total of 30 or less sets. The number of sets is appropriately determined depending on factors such as the diameter, wall thickness, material, and hardness of the round pipe to be formed, and the required shape and dimensions of the square pipe. You can choose. The diameter of each of the horizontal rolls and the vertical rolls for molding is appropriately determined depending on the size, shape, and the like of the target raw tube and square tube. For example, a circular tube having a diameter of 4 inches is used as the raw tube. In this case, it is also possible to use a small-diameter forming roll having a diameter of at most 50 to 60 mmφ only from the viewpoint of deformation of the raw tube. In this case, the length of the orthogonal roll row forming device is about 2.5 m to 3.0 m in total, which is sufficiently shorter than the conventional forming device, and the length of the device can be greatly reduced. . In any case,
Since molding is performed with a relatively large number of pairs of forming rolls, the amount of forming (forming strain) per roll is very small as compared with the conventional four-roll forming method, and therefore, during forming or during forming. It is possible to completely prevent the occurrence of cracks and other product defects at the corners of the cross section of the subsequent product square tube, and to obtain a square tube having a very high flatness at the sides.

Further, in the rectangular roll forming apparatus for manufacturing a square tube according to the present invention, all upper horizontal rolls and all lower horizontal rolls belonging to the plurality of horizontal roll pairs are divided into a plurality of groups. The upper horizontal roll group and the lower horizontal roll group belonging to each of the divided groups are respectively supported by a common support frame (not shown), and are set by using a preset position changing numerical control mechanism provided in advance. By moving the support frame in the vertical direction in synchronization with each other, the gap between the upper horizontal roll group and the lower horizontal roll group can be arbitrarily changed, and a mechanism capable of adjusting the gap is provided. All right vertical rolls and all left vertical rolls that belong to a set of vertical roll pairs and are viewed in the traveling direction are divided into a plurality of groups, respectively, and right vertical rolls belonging to each of the divided groups Alternatively, the left vertical roll group is supported by a common support frame (not shown), and the left and right roll groups are moved in the left and right directions in synchronization with each other by using a preset position change numerical control mechanism provided in advance. By having a mechanism capable of arbitrarily changing the gap between the right vertical roll group and the left vertical roll group, using the above roll gap change numerical control mechanism, without replacing the roll at all, all The roll can also be used to easily respond to dimensional changes in the base tube and the square tube. Further, on the downstream side of the orthogonal roll row forming apparatus, two horizontal flat rolls and two vertical flat rolls having axes in the same plane are incorporated,
An orthogonal four-roll type having a function in which the vertical and horizontal dimensions of the rectangular gap formed by these four flat rolls can be arbitrarily changed using a roll gap changing numerical control mechanism provided in advance. Molding device (not shown)
Are arranged such that the planes including the axes of the two built-in horizontal flat rolls and the two vertical flat rolls are substantially perpendicular to the horizontal line H1, and one or more By using a plurality of tubes, it is possible to perform arbitrary contraction processing on the raw tube and the square tube.

Further, in the orthogonal roll row forming apparatus for manufacturing a square tube according to the present invention, the rows of the horizontal roll pairs and the vertical roll pairs which are alternately arranged, and the orthogonal four-roll molds which are arranged downstream thereof are provided. A roll drive device (not shown) capable of driving a part of the rolls arbitrarily selected from among the roll group built in the row of the forming device is provided,
The circular tube to be molded and the square tube during or after molding can be sent by themselves, and the function of the apparatus of the present invention can be further improved.

The orthogonal roll forming apparatus for producing a square tube according to the present invention thus constructed has the following advantages as compared with a conventional circular tube-to-square tube forming apparatus. 1) A range of fixed pipe dimensions and product dimensions (minimum outer diameter of pipe: maximum outer diameter of pipe = 1: 5, aspect ratio of product cross section = 1: 1)
In the case of ロ ー ル 1: 5), it is not necessary to change the rolls, so that the operability and the productivity can be significantly improved. 2) Since the tube is gently deformed, the tube easily enters the roll gap, and the required thrust can be greatly reduced. Therefore, the molding speed can be stabilized. 3) Since the raw pipe is gently deformed, the accumulation of excess strain is small, and defects such as cracks during and after molding are suppressed, while the flatness of the side of the cross section is high and the corners are sharper. It is possible to manufacture bent square tubes. 4) Since each portion of the circular tube is smoothly deformed, it is difficult for the hollow portion of the rectangular tube to have a dent at the side portion thereof, and in particular, to obtain a square tube having a good flatness in a portion extending from the corner portion to the side portion. Can be.

[0010]

FIG. 4 shows an embodiment of the present invention. FIG. 4 (a)
The horizontal roll pair and each vertical roll pair in the square tube manufacturing orthogonal roll row forming apparatus according to the present invention is set so that the roll gap formed by them has a predetermined size,
A case in which a square tube having a required square cross section having a relatively large size is manufactured from a required circular tube. FIG. 4 (b)
In the same rectangular roll forming apparatus for producing square tubes as in the case of FIG. 4 (a), the gap between each horizontal roll pair and each vertical roll pair is changed using the provided roll setting position changing numerical control mechanism. 4A shows a case where a square tube having a rectangular cross section different from that of FIG. 4A is manufactured from a circular tube having the same outer diameter as that of FIG. 4A. FIG. 4 (c) uses the same rectangular roll row forming apparatus for producing square tubes, and changes the gap between each horizontal roll pair and each vertical roll pair using the provided roll setting position changing numerical control mechanism. FIG.
(A), a case where a square tube having a small square cross section is manufactured from a circular tube having a smaller outer diameter than the case of FIG. 4 (b). FIG. 5 is a cross-sectional view of a horizontal roll pair and a vertical roll pair of a rectangular tube forming apparatus for manufacturing a square tube according to the present invention, using a provided roll setting position changing numerical control mechanism while feeding a circular tube. An example of manufacturing a deformed square tube whose cross-sectional shape and dimensions change in the longitudinal direction by changing each portion of the circular tube viewed in the longitudinal direction so as to be formed in a different roll gap will be described.

[0011]

As described above, the orthogonal roll row forming apparatus for manufacturing a square tube according to the present invention is a molding apparatus for forming a circular tube into a square tube, which is impossible with a conventional forming method. Achieved complete dual use of rolls, enabling efficient manufacture of square tubes with different dimensions without changing rolls.In addition, forming rolls were divided into multiple groups, and the roll groups belonging to each group and their support By introducing a mechanism that unitizes the mechanism and numerically changes and controls the set position of the roll in unit units, improves operability, significantly improves the productivity of molding work, and gently deforms the raw tube It is possible to manufacture a square tube product having extremely high shape and dimensional accuracy and a high quality level easily and at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a forming roll of a conventional square tube forming apparatus.

FIG. 2 is a schematic diagram showing a schematic configuration of a square tube forming apparatus using a punch forming method.

FIG. 3 is a schematic diagram showing a schematic configuration of a pair of forming horizontal rolls and a pair of vertical rolls incorporated in the rectangular tube forming apparatus for producing square tubes according to the present invention.

FIG. 4 is a schematic view showing a state in which three different types of square tubes are manufactured by the same square roll forming apparatus for manufacturing square tubes according to the present invention. FIG. 4a shows a case where a square tube having a relatively large size is manufactured from a required circular tube, and FIG.
Indicates a case where rectangular rectangular tubes having different shapes and dimensions are manufactured from circular tubes having the same diameter.

FIG. 5 shows a deformed square tube whose shape and dimensions change in the longitudinal direction, which can be manufactured using the orthogonal roll row forming apparatus for manufacturing a square tube according to the present invention.

[Explanation of symbols]

10a ... Upper horizontal roll of the 4-roll molding device 10b ... Lower horizontal roll of the 4-roll molding device 10c ... Upper horizontal roll of the 4-roll molding device 10d ... Lower horizontal roll 20a of the 4-roll molding device ... Right vertical roll 20b of the four-roll molding device 20b ... Left vertical roll 20c of the four-roll molding device 20d ... Right vertical roll 20d of the four-roll molding device 30 ... Press Hydraulic cylinder 40 of the punching and forming apparatus Pressurizing ram 50a of the punching and forming apparatus Rolls with a built-in roll stand of the punching and forming apparatus 50b Rolls and rolls with a built-in roll stand of the punching and forming apparatus 50c Roll group incorporated in the roll stand of the punching and forming apparatus 60... Raw pipe or circular pipe 70... Product square pipe 81 b. Upper horizontal roll 81c to be incorporated in the orthogonal roll row forming apparatus Lower horizontal roll 82b to be incorporated in the orthogonal roll row forming apparatus Lower horizontal roll 82c to be incorporated in the orthogonal roll row forming apparatus Lower horizontal roll 8nb to be incorporated in the orthogonal roll row forming apparatus Upper horizontal roll 8nc incorporated in the orthogonal roll forming apparatus Lower horizontal roll 91b incorporated in the orthogonal roll forming apparatus Left vertical roll 91c incorporated in the orthogonal roll forming apparatus 91c incorporated in the orthogonal roll forming apparatus Right vertical roll 92b ... Left vertical roll 92c incorporated in the orthogonal roll row forming device Right vertical roll 9mb incorporated in the orthogonal roll row forming device Left vertical roll 9mc incorporated in the orthogonal roll row forming device Right vertical roll H1 incorporated in roll row forming device ... Horizontal line as a reference for the roll arrangement of the exchange bank of rolls forming apparatus

Claims (4)

[Claims] 1. A plurality of pairs of horizontal rolls forming an upper and lower pair, wherein a pair of horizontal rolls having mutually equal surface shapes of upper rolls and lower rolls, and a plurality of pairs of vertical rolls forming a left and right pair are provided. A vertical roll pair in which the surface shapes of the left roll and the right roll that are opposed to each other are equal to each other, and the top and bottom and right and left of the roll gap of all the horizontal roll pairs and all the vertical roll pairs. Are arranged such that their centers lie on one horizontal straight line, and the axes of all the horizontal roll pairs and all the vertical roll pairs are orthogonal to the horizontal straight line, The horizontal roll pairs and the vertical roll pairs are arranged alternately along the horizontal straight line, and the horizontal roll pairs and the vertical roll pairs are arranged from one end to the other end of the arrangement. vertical The curvature of the surface shape of each roll of the roll pair in the axial direction gradually decreases, and in the final stage, the surface shape of each roll of the horizontal roll pair and the vertical roll pair is limited to a flat roll surface shape. Through the roll gaps of the horizontal roll pair and the vertical roll pair, which are arranged so as to maintain the required roll gap by using the equipped roll setting position changing numerical control mechanism. Send the required circular pipe and push or pull it out to apply the required deformation to the circular pipe,
An orthogonal roll row forming apparatus for manufacturing a square tube, wherein a required square tube can be manufactured by forming the tube into a square tube having a square cross section or a rectangular cross section. 2. The orthogonal roll row forming apparatus according to claim 1, wherein all the upper horizontal rolls and all the lower horizontal rolls of the plurality of horizontal roll pairs are divided into a plurality of groups. The upper horizontal roll group belonging to each divided group and the lower horizontal roll group belonging to each divided group are supported by a common support frame for each group, and the upper horizontal roll group support frame By moving the lower horizontal roll group support frame in the vertical direction synchronously using a set position change numerical control mechanism, the vertical horizontal roll gap between the upper horizontal roll group and the lower horizontal roll group is reduced. Having a mechanism that can be arbitrarily changed, further, all the right vertical rolls and all the left vertical rolls of the plurality of vertical roll pairs are divided into a plurality of groups,
The right vertical roll group belonging to each divided group and the left vertical roll group belonging to each divided group are supported by a common support frame for each group, and the left vertical roll group support frame and By moving the right vertical roll group support frame in the horizontal direction synchronously using a set position change numerical control mechanism, the gap between the right vertical roll group and the left vertical roll group viewed in the left and right direction can be arbitrarily determined. A mechanism capable of changing the positions of the support frame of the vertical horizontal roll group and the support frame of the left and right vertical roll group is arbitrarily changed, so that the vertical and horizontal directions of the square tube manufacturing orthogonal roll row forming apparatus are changed. Can be arbitrarily changed, and a required circular pipe is fed through the roll gaps of the changed horizontal roll pair and the vertical roll pair, and punching or drawing is performed. By forming the required square tube with the required deformation, all horizontal roll pairs and vertical roll pair rolls can be used without any replacement, and different cross sections can be obtained from circular tubes having different diameters. An orthogonal roll row forming apparatus for producing square tubes, which can arbitrarily form square tubes having dimensions. 3. The rectangular roll row forming apparatus for producing a square tube according to claim 1 or 2, further comprising, following the horizontal or vertical roll pair disposed at the most downstream position, further downstream thereof. Two horizontal flat rolls and two vertical flat rolls are incorporated, and the four flat rolls are arranged such that their axes are all on the same plane and the four flat rolls By changing the position of the
One or more orthogonal four-roll molding machines having a roll setting position changing numerical control mechanism capable of arbitrarily changing the vertical height and the horizontal width of the rectangular gap formed by the flat rolls, The orthogonal four-roll molding device is built into one horizontal straight line connecting the vertical and horizontal centers of the roll gap of the rectangular tube forming device for producing square tubes.
The square tube is arranged such that the plane including the axis of the flat rolls is substantially vertical, and the vertical and horizontal centers of the rectangular gap formed by the four flat rolls are on the horizontal straight line. Arbitrarily synchronizing and associating the respective roll gaps of the manufacturing orthogonal roll row forming apparatus and the orthogonal 4 roll forming apparatus row with each other by using a set position changing numerical control mechanism provided in each apparatus. Change, feed and punch or pull out a required circular tube through the roll gap to apply a required deformation to the circular tube and form it into a required square tube. The orthogonal 4
Without replacing any of the rolls built into the roll forming device, any required square tube having a square cross section or a rectangular cross section having a different size can be arbitrarily changed from a required circular tube having a different size without changing all the rolls. When manufacturing
An orthogonal roll row forming apparatus for producing a square tube, wherein the circular tube and the square tube can be subjected to arbitrary contraction processing. 4. An orthogonal roll row forming apparatus for producing a square tube according to claim 1, 2 or 3, wherein rows of alternately arranged horizontal roll pairs and vertical roll pairs and the downstream side thereof are provided. An orthogonal roll for manufacturing a square tube, comprising: a roll driving device capable of driving only a part of rolls selected in advance from among a group of rolls built in an array of arranged four-roll forming apparatuses. Row forming equipment.