JP2009125793A - Tubular body welding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly weld a butted portion of a workpiece by realizing the positional relationship of both members to be constantly adequate without requiring any complicated adjusting work even when an inner circumferential surface of a through-hole is worn. <P>SOLUTION: A welding tool 2 for forming a through-hole 11 through which a workpiece 20 passes is divided into an upper tool 2A and a lower tool 2B. The upper and lower tools are stored in an upper body 1A and a lower body 1B with a predetermined space therebetween, and the lower tool 2B is vertically movable. When the workpiece 20 passes through the through-hole 11, the lower tool 2B is upwardly urged toward the upper tool 2A. The lower tool 2B is upwardly moved according to the wear of the inner circumferential surface of the through-hole 11, and an outer circumferential surface of the workpiece comes into contact with the inner circumferential surface of the through-hole 11, thereby preventing the workpiece 20 from being turned in the through-hole 11, or moved in the plane orthogonal to the axial direction of the workpiece 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tubular body welding apparatus that performs welding in a state where end faces of a workpiece obtained by bending a metal plate material into a cylindrical shape are butted in the circumferential direction.

  When forming a cylindrical metal thin tube, a metal plate material is bent into a substantially perfect circle, and the two end faces butted in the circumferential direction are welded. As an apparatus used for welding two end faces, a pipe welding apparatus provided with a through hole through which a cylindrical workpiece passes has been proposed (for example, see Patent Document 1). In such a tubular body welding apparatus, a welding tool is disposed so as to be exposed at a part of the through hole, and the butted portion of the work is welded at a predetermined welding position while the work passes through the through hole.

  The inner diameter of the through hole is made equal to the outer diameter of the workpiece, and the inner peripheral surface of the through hole is worn by contact with the outer peripheral surface of the workpiece. If this is left unattended, the workpiece rotates or moves in the radial direction when passing through the through-hole, so that the workpiece cannot smoothly pass through the through-hole, and an error occurs in the positional relationship between the workpiece and the welding tool. Cannot be reliably welded.

Therefore, in the conventional tube welding apparatus, the welding jig constituting the through hole is divided into an upper right member, a left upper member, and a lower member within a plane orthogonal to the axial direction of the through hole, and the inner periphery of the through hole is divided. The upper right side member and the upper left side member are brought closer to the lower side member in accordance with the surface wear state. For this reason, the conventional tube welding apparatus supports the upper right member and the upper left member so as to be movable with respect to the lower member within the apparatus main body, and includes two adjusting screws. The two adjusting screws penetrate the apparatus main body in a direction parallel to the moving direction of the upper right member and the upper left member, and are screwed into the upper right member and the upper left member. When the adjustment screw is rotated, the amount of screwing between the adjustment screw, the upper right member and the upper left member changes, and the upper right member and the upper left member approach or separate from the lower member.
Japanese Patent Publication No. 2-15310

  However, in the conventional pipe welding apparatus, it is necessary to rotate the adjustment screw by an amount corresponding to the amount of wear on the inner peripheral surface of the through hole so that the upper right member and the upper left member approach the lower member. For this reason, in order to reduce the number of rotations of the adjusting screw, it is indispensable to measure the amount of wear, but this measurement is not easy. On the other hand, in order to eliminate the need for measuring the amount of wear, it is necessary to repeat the rotation operation of the adjusting screw by trial and error while verifying the passing state of the work in the through hole. In any case, in the conventional pipe welding apparatus, the operation of moving the upper right member and the upper left member by an appropriate amount according to the wear amount of the inner peripheral surface of the through hole becomes complicated.

  The object of the present invention is to ensure that the positional relationship between the two members is always appropriate without requiring complicated adjustment work even when wear occurs on the inner peripheral surface of the through-hole, and to accurately align the workpiece butt portion. An object of the present invention is to provide a tube welding apparatus capable of welding.

  In order to solve the above problems, the present invention includes a welding jig, a welding tool, and an urging means. The welding jig has a through-hole through which a cylindrical workpiece by butting two end faces parallel to each other in the circumferential direction passes in the axial direction, and the first member and the first member arranged with a gap therebetween It is divided into two members in the vertical direction. The welding tool is exposed at a predetermined welding position in the axial direction in the through hole and faces the butted portion of the workpiece. The biasing means biases one of the first member and the second member toward the other while the work is passing through the through hole.

  In this configuration, when the cylindrical workpiece passes through the through-hole, the first member and the second member constituting the through-hole are urged in a direction approaching each other by the urging means. Therefore, when the inner peripheral surface of the through hole is worn due to contact with the workpiece, the first member and the second member approach each other by an amount corresponding to the wear amount, and the workpiece rotates or moves in the radial direction. There is no.

  In this configuration, the urging means can be constituted by a pressure generating means for generating a pressure that urges either the first member or the second member toward the other.

  According to this invention, when the cylindrical workpiece passes through the through hole, the first member and the second member constituting the through hole are biased in a direction approaching each other, so that the inside of the through hole is The first member and the second member can be brought close to each other by an amount corresponding to the amount of wear on the peripheral surface. The workpiece can be prevented from rotating or moving in the radial direction when passing through the through-hole, and even if the inner peripheral surface of the through-hole is worn, the work-matching part is always kept without requiring complicated adjustment work. It can be welded accurately.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a tube welding apparatus according to an embodiment of the present invention. The tubular body welding apparatus 10 according to the embodiment of the present invention welds a butt portion 30 of a cylindrical workpiece 20 made of a metal plate material along the axial direction to produce a tubular body. The workpiece 20 is formed in a cylindrical shape in which a rectangular plate material is bent in advance and two end faces parallel to each other are butted in the circumferential direction. The tube welding apparatus 10 includes a main body 1, a welding jig 2, a pressing member 3, a welding torch 4, and a guide blade 5.

  The main body 1 is divided into an upper main body 1A and a lower main body 1B and divided into upper and lower parts, and then integrated into a substantially rectangular parallelepiped shape via fixtures 7A to 7D and fixtures 8A to 8D. 2 is supported. Note that the fixtures 7C, 7D, 8C, and 8D do not appear in FIG. A space is formed between the upper main body 1A and the lower main body 1B.

  Concave portions 18 and 19 penetrating the through hole 11 are formed on the upper surface 17 of the upper main body 1A. The guide blade 5 is disposed in the recess 18. A welding torch 4 is disposed in the recess 19.

  The guide blade 5 exposes the blade portion 51 along the axial direction of the through hole 11 formed in the lower end portion in the through hole 11.

  The welding torch 4 is a welding tool of the present invention, and is inserted into the concave portion 19 from above, and the lower end portion reaches a position close to the inner peripheral surface of the through hole 11. The welding torch 4 is held by the upper jig 2 </ b> A so that the position of the lower end portion in the circumferential direction of the through hole 11 coincides with the position of the blade portion 51 of the guide blade 5.

  The pressing member 3 has, for example, a circular plate shape, is disposed with its center position aligned with the center of the through hole 11, and is reciprocally movable along the axial direction of the through hole 11. The pressing member 3 includes arm portions 31 to 33 extending in the radial direction from three equally spaced locations on the peripheral surface. The diameter of the arc passing through the outer edge portions of the arm portions 31 to 33 is larger than the outer diameter of the workpiece 20. Each of the arm portions 31 to 33 faces the groove portions 14 to 16.

  2A and 2B are a front view and a side cross-sectional view of a welding jig provided in the tube welding apparatus. The welding jig 2 is divided into two parts, an upper jig 2A and a lower jig 2B. The upper jig 2A and the lower jig 2B correspond to the first member and the second member of the present invention, respectively. A through hole 11 is formed between the upper jig 2A and the lower jig 2B.

  The inner diameter of the through hole 11 is substantially equal to the outer diameter of the workpiece 20. In the upper jig 2A and the lower jig 2B, groove portions 14 to 16 are formed over the entire length in the axial direction at three equally spaced locations on the inner circumferential surface of the through hole 11. Note that the inner diameter of the through hole 11 may be gradually decreased from the front side toward the back side in order to facilitate the insertion of the workpiece 20.

  The upper jig 2A is formed by forming grooves 14, 15, slits 21, recesses 23, and step portions 24A, 24B on an upper member obtained by equally dividing a cylinder having the diameter of the through hole 11 into an inner part in the vertical direction. is there. Therefore, the lower end surface of the upper jig 2 </ b> A is a horizontal plane that passes through the central axis of the through hole 11.

  The lower jig 2B lowers the upper end surface of the lower member obtained by dividing the cylinder having the diameter of the through hole 11 into two equal parts in the vertical direction by an interval to be formed between the upper jig 2A and the groove portion. 16 and step portions 25A and 25B are formed.

  An inclined surface in a direction in which the inner diameter decreases from the front side to the back side is formed at the front end portions of the inner peripheral surfaces of the upper jig 2A and the lower jig 2B, and the workpiece 20 to the through hole 11 is formed. Easy to insert.

  As shown in FIG. 1, the guide blade 5 is inserted into the slit 21 from above. The recess 23 is formed to be continuous with the recess 19, and the tip of the welding torch 4 inserted into the recess 19 is disposed in the recess 23.

  3 (A) and 3 (B) are a front sectional view and a side sectional view of the tube welding apparatus. A recess 41 having a semicircular arc-shaped inner peripheral surface along the axial direction of the through hole 11 is formed in the upper body 1A so as to open to the bottom surface side. In the lower main body 1B, a concave portion 42 having a substantially semicircular inner circumferential surface along the axial direction of the through hole 11 is formed open to the upper surface side. The inner diameters of the recesses 41 and 42 are equal to the outer diameters of the upper jig 2A and the lower jig 2B, respectively. The upper main body 1 </ b> A and the lower main body 1 </ b> B are provided with a predetermined interval between each other so that the centers of the inner peripheral surface of the concave portion 41 and the inner peripheral surface of the concave portion 42 coincide with the central axis of the through hole 11. Are fixed together.

  The upper jig 2 </ b> A is accommodated in the recess 41. With the upper jig 2A stored in the recess 41, the fixing bolts 43A and 43B are screwed into the upper body 1A from the bottom surface side. The heights of the heads of the fixing bolts 43A and 43B are equal to the heights of the step portions 24A and 24B. Therefore, the upper jig 2A is fixed in the recess 41 by the fixing bolts 43A and 43B in a state where the vertical position of the lower end surface coincides with the bottom surface of the upper main body 1A.

  The lower jig 2 </ b> B is accommodated in the recess 42. With the lower jig 2B housed in the recess 42, the fixing bolts 44A and 44B are screwed into the lower main body 1B from the upper surface side. The heights of the heads of the fixing bolts 44A and 44B are shorter than the heights of the step portions 25A and 25B. Therefore, the lower jig 2B is located between the bottom surface of the head of the fixing bolts 44A and 44B and the bottom surface of the step portions 25A and 25B in a state where the vertical position of the upper end surface coincides with the upper surface of the lower main body 1B. A gap D is formed.

  The fixing bolts 43 </ b> A, 43 </ b> B, 44 </ b> A, 44 </ b> B are arranged in plural in the axial direction of the through hole 11.

  The upper body 1A in which the upper jig 2A is housed in the recess 41 and the lower body 1B in which the lower jig 2B is housed in the recess 42 are fixed to the fixtures 7A to 7D (FIG. 7B does not appear.) And fixtures 8A to 8D (in FIG. 3, the fixtures 8A and 8B do not appear), the lower jig 2B has the front and back surfaces fixed to the fixtures 7A to 7D. To be movable in the vertical direction within the range of the gap D.

  In the recess 42 of the lower main body 1B, a pusher storage portion 51 and cylinder portions 52 and 53 are formed continuously in the vertical direction at the bottom. The pusher storage 51 has a rectangular shape in a plan view and is open in the recess 42. The cylinder parts 52 and 53 each have a circular shape in plan view, and are open in the pusher storage part 51.

  The pusher 9 is fitted into the pusher storage portion 51 from the upper surface side of the lower main body 1B. The upper surface of the pusher 9 is formed in a circular arc continuous with the inner peripheral surface of the recess 42, and abuts on the outer peripheral surface of the lower jig 2 </ b> B housed in the recess 42. Note that the upper surface of the pusher 9 can be formed of a plurality of inclined surfaces that circumscribe the inner peripheral surface of the recess 42 along the circumferential direction of the recess 42.

  Pistons 9 </ b> A and 9 </ b> B protrude from the bottom surface of the pusher 9 along the axial direction of the through hole 11. When the pusher 9 is stored in the pusher storage portion 51, the pistons 9A and 9B are fitted into the cylinder portions 52 and 53 from above. At this time, spaces are formed between the bottom surfaces of the pistons 9A and 9B and the bottom surfaces of the cylinder portions 52 and 53, respectively. In each of the pistons 9A and 9B, a groove is formed along the circumferential direction in an intermediate portion in the vertical direction. As an example, an elastic O-ring is attached to the groove.

  An air flow path 54 communicating with the back surface of the lower main body 1B is opened on the bottom surfaces of the cylinder portions 52 and 53. The air flow path 54 is connected to the air cylinder 55 on the back side of the lower main body 1B. The air cylinder 55 is a pressure generating means of the present invention, and selectively supplies pressurized air into the cylinders 52 and 53 via the air flow path 54. The pusher 9 and the air cylinder 55 correspond to the urging means of the present invention.

  After a part of the workpiece 20 is inserted into the through-hole 11 and before the welding of the butting portion 30 of the workpiece 20 by the welding torch 4 is completed, the cylinder 52 passes from the air cylinder 55 via the air channel 54. , 53 is supplied with pressurized air. Due to the pressure acting on the bottom surfaces of the pistons 9A and 9B from the pressurized air, the lower jig 2B is urged toward the upper upper jig 2A via the pusher 9.

  The inner diameter of the through hole 11 formed by the upper jig 2 </ b> A and the lower jig 2 </ b> B is substantially equal to the outer diameter of the workpiece 20. When a plurality of workpieces 20 to be welded to the butted portions 30 sequentially pass through the through holes 11, the inner peripheral surface of the through holes 11 is worn by contact with the outer peripheral surface of the workpiece 20. At this time, the lower jig 2 </ b> B is moved upward by the pressurized air supplied from the air cylinder 55 to the cylinders 52 and 53 according to the wear amount of the inner peripheral surface of the through hole 11, and the inner peripheral surface of the through hole 11. Always adheres to the outer peripheral surface of the workpiece 20. Thereby, the work 20 does not rotate in the through hole 11 or moves in a plane orthogonal to the axial direction, and the butted portion 30 can be accurately welded by the welding torch 4.

  When wear of the inner peripheral surface of the through hole 11 progresses and the amount of upward movement of the lower jig 2B reaches the length of the gap D, the stepped portions 25A and 25B come into contact with the heads of the fixing bolts 44A and 44B. Then, the upward movement of the lower jig 2B stops. In this state, it is determined that the wear on the inner peripheral surface of the through hole 11 has reached a predetermined amount, and the upper jig 2A and the lower member 2B are replaced. Therefore, the gap D should be set to such a length that the roundness of the workpiece 20 does not exceed an allowable range.

  The upward movement of the lower jig 2B is stopped by contact with the workpiece 20 located in the through hole 11 until the step portions 25A and 25B contact the heads of the fixing bolts 44A and 44B. Accordingly, the urging force by the urging means should be set based on the strength of the work 20 so that the work 20 is not deformed by the upward movement of the lower jig 2B.

  The tube welding apparatus 10 may be provided with an informing means for detecting and notifying that the amount of upward movement of the lower jig 2B has reached the length of the gap D. The notification means can be constituted by an indicator lamp or a buzzer.

  The tube welding device 10 can also be used in a state rotated from the state shown in FIG. 1 by a predetermined angle around the central axis of the through hole 11.

  Further, a pusher storage portion and a cylinder portion are also provided in the upper body 1A, and both the upper jig 2A and the lower jig 2B are moved in a direction approaching each other in accordance with the wear state of the inner peripheral surface of the through hole 11. You may do it.

  The above embodiments are merely examples, and the present invention is not limited to these embodiments, and various modifications can be made within the scope of the present invention.

  For example, in the above embodiment, the vertical movement of the lower jig 2B is guided by the fixture that integrally fixes the upper main body 1A and the lower main body 1B. You may form the convex part and groove part which mutually engage with the side jig | tool 2B in an up-down direction.

  Further, the pressure generating means is not limited to the air cylinder 55 that supplies the pressurized gas to the cylinders 52 and 53, but may supply the pressurized liquid to the cylinders 52 and 53.

It is a perspective view of the pipe welding device concerning an embodiment of this invention. (A) And (B) is the front view and side surface sectional drawing of a welding jig with which a tubular body welding apparatus is equipped. (A) And (B) is front sectional drawing and side sectional drawing of a pipe body welding device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 1A Upper main body 1B Lower main body 2 Welding jig 2A Upper jig 2B Lower jig 3 Pusher 4 Welding torch (welding tool)
DESCRIPTION OF SYMBOLS 10 Pipe body welding apparatus 11 Through-hole 20 Workpiece | work 30 Butting part 55 Air cylinder (pressure generation means)

Claims (2)

A welding jig having a through-hole through which a cylindrically shaped work that has two end faces parallel to each other in the circumferential direction passes in the axial direction, and a predetermined welding position in the axial direction in the through-hole are exposed to the workpiece. A welding tool facing the butted portion,
The welding jig is composed of a first member and a second member that are divided up and down in a range including the through hole,
The first member and the second member are arranged such that at least one of them is movable in the direction of approaching and separating from the other and spaced from each other,
A pipe welding apparatus further comprising biasing means for biasing the first member and the second member so as to approach each other while a workpiece passes through the through hole.   2. The tube welding apparatus according to claim 1, wherein the urging unit is a pressure generating unit that generates a pressure that urges either the first member or the second member toward the other. 3.

Images