JP2019018229A - Pipe body welder and pipe body manufacturing device - Google Patents

Abstract

To move a welding torch accompanied by displacement of an abutment portion of a workpiece in transportation, and to properly weld the abutment portion by causing the abutment portion constantly and exactly to face the welding torch.SOLUTION: A guide member 2 having a guide blade 21 fitted into an abutment portion Wa of a workpiece W, and a welding torch 1 for welding the abutment portion Wa are integrally fixed to an attachment plate 33. The attachment plate 33 is movably supported by a columnar support 34 in a displacement direction Y intersecting with a transport direction X. The welding torch 1 is displaced by displacement of the abutment portion Wa in the displacement direction Y together with the guide blade 21 in accordance with the displacement of the abutment portion Wa, and the welding torch 1 constantly faces the abutment portion Wa.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tubular body manufacturing apparatus that manufactures a tubular body having a circular cross section by bending a metal flat plate into a cylindrical shape and welding a butt portion, and a tubular body manufacturing apparatus including the tubular body welding apparatus.

  When manufacturing a tubular body having a circular cross section using a metal flat plate as a raw material, a tubular body welding apparatus is known in which a rectangular metal flat plate is bent into a cylindrical shape, and then the butted portions of two end faces facing in the circumferential direction are joined by welding. (For example, refer to Patent Document 1).

  The tube welding apparatus conveys a workpiece obtained by bending a metal flat plate into a cylindrical shape along the axial direction while pressing the workpiece inward along the radial direction with the butted portion facing the welding torch. The butted portion is melted and joined by heating with a welding torch.

  In order to securely join the butt portion by welding, it is necessary to make the welding torch accurately face the butt portion. For this reason, the tubular body welding device includes a guide blade that fits into the abutting portion at the same position as the welding torch in the circumferential direction of the workpiece on the upstream side of the welding torch in the workpiece conveyance direction. By fitting the guide blade into the butted portion, the butted portion is guided to a position facing the welding torch.

JP 2016-22487 A

  However, in the conventional tube welding apparatus, the welding torch and the guide blade are fixed so as not to move in a direction perpendicular to the workpiece conveyance direction in a plane parallel to a plane including the entire abutting portion. . On the other hand, the stress generated during bending remains in the workpiece before welding as a force that causes twisting and warping. The workpiece is restricted from being twisted or warped by the guide blade inserted into the abutting portion, but the restriction is released when the guide blade does not fit into the abutting portion on the downstream side of the guide blade in the transport direction. The residual stress is accumulated inside the workpiece as a reaction force against the regulation by the guide blade, and when the regulation by the guide blade is released, the workpiece is twisted or warped. For this reason, the abutting portion is likely to be displaced in the direction perpendicular to the workpiece conveying direction on the downstream side of the guide blade in the conveying direction, and may not accurately face the welding torch. If this is left unattended, the butted portion cannot be welded properly, and the strength of the tube after welding is lowered.

The object of the present invention is to move the welding torch in accordance with the displacement of the abutting portion of the workpiece being conveyed, so that the abutting portion always faces the welding torch accurately, and the abutting portion can be appropriately welded. An object of the present invention is to provide a pipe welding apparatus and a pipe manufacturing apparatus.

  The tubular body welding apparatus according to the present invention is configured such that a butt portion of two end faces facing each other in the circumferential direction of a workpiece is conveyed while a workpiece obtained by bending a metal flat plate into a cylindrical shape is conveyed along a conveyance direction parallel to the axial direction. In order to continuously weld, a welding torch, a guide member, and a support mechanism are provided. The welding torch faces a part of the outer peripheral surface of the workpiece. The guide member is disposed at the same position as the welding torch in the circumferential direction of the workpiece on the upstream side of the welding torch in the workpiece conveyance direction, and is fitted into the butted portion of the workpiece. The support mechanism integrally supports the welding torch and the guide member so as to be movable along a direction orthogonal to the axial direction of the workpiece within a plane parallel to the plane including the central axis of the workpiece.

  When the workpiece is twisted or warped due to residual stress, the abutting part of the workpiece is displaced in a direction perpendicular to the axial direction in a plane parallel to the plane including the entire center axis of the workpiece. The inserted guide member is displaced integrally with the welding torch. The welding torch is displaced in accordance with the displacement of the butted portion, so that it always faces the butted portion and reliably welds the butted portion.

  In this configuration, the support mechanism includes a support member that integrally supports the welding torch and the guide member, and a direction perpendicular to the axial direction of the workpiece in a plane parallel to the plane including the central axis of the workpiece. It can be supported so as to be movable along both the normal direction of the surface including the central axis. The abutting portion is displaced along the circumferential direction of the workpiece, but the welding torch and the guide member can be reliably moved along the circumferential direction of the workpiece in accordance with the displacement of the abutting portion.

  The support mechanism may include a copying mechanism that moves the welding torch and the guide member along the circumferential direction of the workpiece. The welding torch and the guide member can be moved more reliably along the circumferential direction of the workpiece in accordance with the displacement of the butted portion.

  Furthermore, a braking member that restricts the movement of the welding torch and the guide member can be provided in a braking time including a period from when the rear end of the workpiece passes through the guide member to when it reaches a position facing the welding torch. . It is possible to prevent the welding torch from moving freely together with the guide member and not facing the butted portion after the guide member is no longer fitted in the butted portion.

  The tube manufacturing apparatus of this invention is provided with the conveyance member with the above-mentioned tube welding apparatus. A conveyance member is arrange | positioned in the upstream and downstream of the pipe welding apparatus in the conveyance direction of a workpiece | work, and conveys a workpiece | work along a conveyance direction.

  According to the present invention, the welding torch can be moved in accordance with the displacement of the abutting portion of the workpiece being conveyed, and the abutting portion can always be accurately opposed to the welding torch and the abutting portion can be appropriately welded. .

1 is an external view of a pipe welding apparatus according to a first embodiment of the present invention. It is side surface sectional drawing of the principal part of the same pipe welding apparatus. (A)-(C) are front views explaining operation | movement of the principal part of the same pipe welding apparatus. It is an external view of the pipe welding apparatus concerning a 2nd embodiment of this invention. (A)-(C) are front views explaining operation | movement of the principal part of the same pipe welding apparatus. (A)-(C) are front views explaining operation | movement of another principal part of the same pipe welding apparatus. 1 is a schematic side view of a tubular body manufacturing apparatus according to an embodiment of the present invention.

  Hereinafter, a pipe welding apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, a tube welding apparatus 10 according to the first embodiment of the present invention includes a welding torch 1, a guide member 2, a support mechanism 3, a tunnel mold 4, and a preheating torch 5. The butted portions Wa at the two parallel ends of the workpiece W obtained by bending a rectangular metal flat plate into a cylindrical shape are welded to form a tubular body. The preheating torch 5 heats the butt portion Wa before welding by the welding torch 1, but is not essential for the pipe welding apparatus 10, and depends on welding conditions such as the material of the workpiece W and the performance of the welding torch 1. Are selectively arranged.

  The workpiece W passes through the through hole of the tunnel mold 4 in a state where the abutting portion Wa is located in the notch 42 of the tunnel mold 4 along the transport direction X parallel to the axial direction via a transport device (not shown). 41 is conveyed through. In place of the tunnel mold 4, a plurality of belts, a plurality of chains, or a plurality of roller rows can be arranged along the circumferential direction of the workpiece W.

  The notch portion 42 of the tunnel mold 4 is formed so as to open a part of the peripheral surface of the through hole 41 to the upper surface side, and the lower end portions of the welding torch 1 and the preheating torch 5 are inserted from above. Yes. The preheating torch 5 is arranged on the upstream side of the welding torch 1 in the transport direction X.

  The guide member 2 is disposed on the upstream side of the preheating torch 5 in the transport direction X, and includes a guide blade 21 and a holder 22 as an example. The holder 22 rotatably holds each of the three disk-shaped guide blades 21 arranged along the transport direction X. Each guide blade 21 is fitted into the abutting portion Wa of the workpiece W from above at the periphery.

  The guide member 2 does not necessarily need to be constituted by the disk-shaped guide blade 21. However, by using the three disc-shaped guide blades 21 that are rotatable along the transport direction X as the guide member 2, the guide member 2 is fitted into the butt portion Wa over a relatively long insertion range L in the transport direction X. And the workpiece W can be stably conveyed. In addition, since the three disk-shaped guide blades 21 that are rotatably supported are partially fitted into the butted portion Wa instead of the entire insertion range L, the contact resistance can be reduced, and the workpiece W can be smoothly smoothed. Does not interfere with transport.

  As an example, the support mechanism 3 includes a base plate 31, a support member 32, a mounting plate 33, and a support column 34. The base plate 31 is fixed to a frame (not shown) together with the tunnel mold 4 and supports the four columns 34 so as to be reciprocally movable along a displacement direction Y perpendicular to the transport direction X in plan view. Here, the plan view is a line of sight in a direction opposite to a plane parallel to a plane including the center axis Wb of the work W, and the displacement direction Y is a plane parallel to a plane including the center axis Wb of the work W over the entire surface. In the direction perpendicular to the axial direction of the workpiece W.

  One end of each of the four columns 34 is fixed to the back surface of the mounting plate 33. On the surface of the mounting plate 33, the welding torch 1 and the preheating torch 5 are fixed together with the support member 32 via mounting members 11 and 51. The welding torch 1 and the preheating torch 5 are supported integrally with the support member 32 by a mounting plate 33. The support member 32 supports the holder 22 so as to be movable up and down along the vertical direction Z while restricting movement in the direction along the displacement direction Y. The welding torch 1 and the preheating torch 5 are fixed integrally with the guide member 2 including the guide blade 21 in the displacement direction Y by the mounting plate 33, and reciprocate along the displacement direction Y integrally with the guide blade 21. Moving. The guide blade 21 and the holder 22 are urged downward by their own weight.

  At least one strut 34 is provided with a brake 6 which is a braking member of the present invention. The brake 6 is driven during a braking time T including from when the rear end of the workpiece W passes through the guide blade 21 positioned on the most downstream side until reaching the position facing the welding torch 1. Restrict movement. The welding torch 1, the preheating torch 5, and the guide blade 21 do not move along the displacement direction Y during the braking time T. It is possible to prevent the welding torch 1 and the preheating torch 5 from moving freely together with the guide blade 21 and not facing the butted portion Wa after the guide blade 21 is not fitted into the butted portion Wa.

  If the error in the displacement direction Y between the welding torch 1 and the butt portion Wa during the braking time T can be ignored, the brake 6 can be omitted. The driving of the brake can be controlled by detecting the conveyance time of the workpiece W or the rear end of the workpiece W.

  When the workpiece W being conveyed is twisted or warped due to the residual stress during bending, the butted portion Wa tends to be displaced along the displacement direction Y. In the conventional pipe welding apparatus, since the guide blade fixed in the displacement direction Y completely regulates the displacement of the butting portion Wa in the displacement direction Y, the residual stress of the work W is promoted, and the rear end of the work W is guided by the guide The butt portion Wa was greatly displaced until it reached the position facing the welding torch after passing through the blade.

  On the other hand, in the tube welding apparatus 10 according to the embodiment of the present invention, the displacement of the butted portion Wa in the displacement direction Y is restricted by the weight of the guide member 2 and the sliding resistance of the support column 34 with respect to the base plate 31. However, the butt portion Wa is allowed to be displaced against these. For this reason, the residual stress of the workpiece W does not increase, and the butt portion Wa is largely displaced until the rear end of the workpiece W reaches the position facing the welding torch 1 after passing through the guide blade 21. There is no.

  As shown in FIGS. 3A to 3C, when the butted portion Wa exceeds the weight of the guide member 2 and the sliding resistance of the support column 34 with respect to the base plate 31, it is displaced to the arrow Ya or Yb side in the displacement direction Y. The welding torch 1 is also displaced integrally with the guide blade 21 to the arrow Ya or Yb side. Actually, the abutting portion Wa moves along the circumferential direction of the workpiece W, and also moves in the vertical direction Z along with the displacement in the displacement direction Y. For this reason, the guide blade 21 also moves in the vertical direction Z with the displacement in the displacement direction Y.

  In the tubular body welding device 10, since the welding torch 1 is displaced in accordance with the displacement of the butt portion Wa in the displacement direction Y, the welding torch 1 always faces the butt portion Wa, and the butt portion Wa can be appropriately welded. . In addition, the abutting portion Wa is not greatly displaced until the rear end of the workpiece W passes through the guide blade 21 and reaches the position facing the welding torch 1, and welding is performed by driving the brake 6. The displacement of the torch 1 and the guide blade 21 is restricted. Thereby, the butted portion Wa can be appropriately welded over the entire length of the workpiece W.

  Note that the support mechanism 3 may include a mechanism for biasing the welding torch 1, the preheating torch 5, and the guide 21 to a position facing the center axis of the workpiece W in the displacement direction Y.

  As shown in FIG. 4, the tube welding apparatus 20 according to the second embodiment of the present invention includes a sub-mounting plate 331, a guide 332, a slider 333, and a follower 334 in addition to the tube welding apparatus 10 according to the first embodiment. And a cam plate 335. Since the other structure of the pipe welding apparatus 20 is the same as that of the pipe welding apparatus 10, the same code | symbol is attached | subjected and description is abbreviate | omitted. In addition, in the example shown in FIG. 4, the support | pillar 34 is made into two according to the height of the attachment plate 33 and the sub attachment plate 331. FIG.

  Two sliders 333 are attached to the back surface of the attachment plate 33. Two guides 332 are attached to the surface of the sub attachment plate 331. Each slider 333 is engaged with each guide 332, and the mounting plate 33 is reciprocally movable along the vertical direction Z with respect to the sub mounting plate 331.

  Further, a cylindrical follower 334 is rotatably supported on the back surface of the mounting plate 33. The cam plate 335 is fixed to a frame (not shown), and the upper surface is an arc having a diameter equal to the outer diameter of the workpiece W. The follower 334 presses the circumferential surface against the upper surface of the cam plate 335 by the weight acting from the mounting plate 33. When the mounting plate 33 moves along the displacement direction Y, the mounting plate 33 moves along the vertical direction Z in accordance with the curvature of the outer peripheral surface of the workpiece W. The follower 334 and the cam plate 335 correspond to the copying mechanism of the present invention.

  As shown in FIGS. 5A to 5C, when the abutting portion Wa is displaced along the circumferential direction of the workpiece W due to twisting or warping during the conveyance of the workpiece W, the mounting plate 33 is matched to the displacement of the abutting portion Wa. Is displaced along the displacement direction Y and the vertical direction Z together with the welding torch 1, the preheating torch 5 and the guide blade 21 (which is a part of the guide member 2). When the butt portion Wa is displaced, the welding torch 1 moves along the vertical direction Z according to the displacement, so that the gap G between the welding torch 1 and the butt portion Wa is maintained constant, and the butt portion Wa The welding state is maintained more appropriately.

  The displacement of the butted portion Wa in the vertical direction Z increases as the workpiece W becomes smaller in diameter. When the welding torch 1 does not move along the vertical direction Z, the gap G between the welding torch 1 and the butted portion Wa increases. This makes it impossible to weld properly. Therefore, by applying the configuration of the pipe welding device 20, the welding state can be made appropriate by displacing the welding torch 1 along the vertical direction Z.

  In addition, by providing a swinging mechanism that supports the base plate 31 so as to be swingable between the support column 34 and the auxiliary mounting plate 331, the welding torch 1 is always attached to the workpiece W according to the displacement of the abutting portion Wa. It can also be inclined to face the central axis.

  As shown in FIGS. 6 (A) to (C), the tube welding device 10 or 20 includes a welding torch 1 and a preheating torch 5 together with a guide blade 21 of the guide member 2 via a mounting plate 33 and a butted portion. A return mechanism 40 for returning to the initial position S in the displacement direction of Wa (a direction orthogonal to the axial direction of the workpiece W) may be provided.

  For example, the return mechanism 40 includes a support plate 351, a spring 352, a stopper 353, and a spring 354. The support plate 351 is fixed to the frame 101 like the base plate 31. The spring 352 is fitted on the support column 34 between the base plate 31 and the mounting plate 33, and biases the mounting plate 33 in the direction of the arrow Ya separating from the base plate 31 by elastic force. Note that one end of the column 34 is fixed to the mounting plate 33.

  The stopper 353 is a shaft body having a first flange portion 3531 and a second flange portion 3532 at both ends, and is supported by the support plate 351 so as to be movable in the axial direction. The first flange 3531 can be brought into contact with and separated from the side surface of the mounting plate 33. The second flange 3532 is located on the opposite side of the mounting plate 33 with the support plate 351 interposed therebetween. The length of the stopper 353 in the axial direction is such that the first flange 3531 is located on the side surface of the mounting plate 33 with the guide blade 21 positioned at the initial position S when the second flange 3532 contacts the support plate 351. It is set to abut.

  The spring 354 is fitted on the stopper 353 between the support plate 351 and the first flange 3531, and is biased in the direction of the arrow Yb separating the first flange 3531 from the support plate 351 by an elastic force stronger than the spring 352. To do.

  As shown in FIG. 6A, in the state where the guide blade 21 is not fitted into the abutting portion Wa of the workpiece W or the abutting portion Wa is not displaced, the mounting plate 33 includes a spring 352 and a spring 354. No force other than the elastic force of. Therefore, the stopper 353 presses the mounting plate 33 in the direction of the arrow Yb by the first flange 3531 until the second flange 3532 contacts the support plate 351 by the elastic force of the spring 354 stronger than the spring 352. The guide blade 21 is held at the initial position S via the mounting plate 33 by the elastic force of the spring 352 and the spring 354.

  As shown in FIG. 6B, when a force in the direction of the arrow Ya acts on the mounting plate 33 via the guide blade 21 due to the displacement of the butting portion Wa of the workpiece W, the mounting plate 33 resists the elastic force of the spring 354. Is displaced in the direction of the arrow Ya. When the guide blade 21 does not fit into the abutting portion Wa of the workpiece W from this state, the guide blade 21 is moved to the initial position S via the mounting plate 33 by the elastic force in the arrow Yb direction of the spring 354 stronger than the spring 352. Return.

  As shown in FIG. 6C, when a force in the direction of the arrow Yb acts on the mounting plate 33 via the guide blade 21 due to the displacement of the butting portion Wa of the workpiece W, the mounting plate 33 resists the elastic force of the spring 352. Is displaced in the direction of arrow Yb. When the guide blade 21 does not fit into the abutting portion Wa of the workpiece W from this state, the guide blade 21 returns to the initial position S via the mounting plate 33 by the elastic force of the spring 352 in the arrow Ya direction.

  When the workpiece W is carried into the tube welding apparatus 10 or 20, the upstream end of the abutting portion Wa in the conveying direction X is made to coincide with the initial position S of the guide blade 21, and the guide blade is brought along with the loading of the workpiece W. 21 is fitted in the abutting portion Wa along the conveyance direction X. Even when the abutting portion Wa is displaced, the brake 6 is driven after the end of the abutting portion Wa on the downstream side in the transport direction X passes through the guide blade 21 and passes the position facing the welding torch 1. When the operation is finished, the guide blade 21 returns to the initial position S.

  The guide member 2 including the guide blade 21 has an initial position S of the guide blade 21 together with the welding torch 1 and the preheating torch 5 by the return mechanism 40 when the welding portion Wa of the workpiece W is not welded by the welding torch 1. Return to. When a plurality of workpieces W are intermittently carried into the tube welding apparatus 10 or 20, the position of the abutting portion Wa can be made constant for all the workpieces W, and the workpiece W loading operation can be facilitated.

  As shown in FIG. 7, the pipe body manufacturing apparatus 100 according to the embodiment of the present invention includes transport roller pairs 102 and 103 on the upstream side and the downstream side of the pipe body welding apparatus 10 in the transport direction X. The conveying roller pairs 102 and 103 are pivotally supported by a frame 101 that fixes the tube welding apparatus 10 and supplied with rotation of a motor (not shown). When the length of the workpiece W in the conveyance direction X is relatively short, a pusher and a puller may be provided as a conveyance member of the present invention instead of or in combination with the conveyance roller pair 102 and 103. Moreover, it can replace with the pipe welding apparatus 10 and the pipe welding apparatus 20 can also be used.

  When the tube welding device 10 or the tube welding device 20 includes the return mechanism 40 shown in FIG. 6, the circumferential position of the abutting portion Wa of the workpiece W is guided in the vicinity of the conveying roller pair 103. An alignment member 104 that is defined at a position facing the initial position S of the blade 21 can also be provided. A plurality of alignment members 104 may be provided along the conveyance direction X.

  The description of the above-described embodiment is an example in all respects, and should be considered as not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

1-welding torch 2-guide member 3-support mechanism 4-tunnel mold 5-preheating torch 6-brake (braking member)
10, 20-Tube welding device 40-Return mechanism 100-Tube manufacturing device 102, 103-Conveying roller (conveying member)
104-positioning member 334-follower (copying mechanism)
335-Cam plate (copying mechanism)
W-work Wa-butting part

Claims (7)

This is a tube welding apparatus for welding the butted portions of two end surfaces facing each other in the circumferential direction of a workpiece while a workpiece obtained by bending a metal flat plate into a cylindrical shape is conveyed along a conveyance direction parallel to the axial direction. And
A welding torch facing a part of the outer peripheral surface of the workpiece;
A guide member that is disposed at the same position as the welding torch in the circumferential direction of the workpiece on the upstream side of the welding torch in the conveying direction, and is fitted into the abutting portion;
A first moving member that integrally supports the welding torch and the guide member so as to be movable along a direction perpendicular to the axial direction of the workpiece within a plane parallel to a plane including the central axis of the workpiece; Having a support mechanism;
A pipe welding apparatus equipped with   The support mechanism includes a direction perpendicular to the axial direction of the workpiece and a normal direction of a plane including the central axis of the workpiece within a plane parallel to the plane including the central axis of the workpiece. And a tube welding apparatus according to claim 1, wherein the tube body welding apparatus is supported so as to be movable along both.   The tubular body welding apparatus according to claim 2, wherein the support mechanism further includes a copying mechanism that moves the welding torch and the guide member along the circumferential direction of the workpiece.   A braking member for restricting movement of the welding torch and the guide member during a braking time including a time from when the rear end of the workpiece passes through the guide member to a time when the workpiece reaches a position facing the welding torch; The tubular body welding apparatus according to any one of claims 1 to 3.   The tube welding apparatus according to any one of claims 1 to 4, further comprising a return mechanism that returns the welding torch and the guide member to an initial position in a direction orthogonal to the axial direction of the workpiece. A pipe welding device according to any one of claims 1 to 4,
A tube manufacturing apparatus, comprising: a conveying member that is arranged on the upstream side and the downstream side of the tube welding apparatus in the conveying direction and conveys the workpiece along the conveying direction. A pipe welding device according to claim 5;
A transport member disposed on the upstream side and the downstream side of the tube welding apparatus in the transport direction, and transports the workpiece along the transport direction;
And a regulating member that regulates a circumferential position of the abutting portion of the workpiece in the transport direction.

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