JP2005131689A - Welding jig for bent pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding jig for a bent pipe, which can surely clamp the bent pipe and is used for welding an entire circumferential end face butted against the end face of other bent pipe or that of a deformed pipe such as a T-shaped piece. <P>SOLUTION: The bent pipe 2 is clamped by a clamp hole 3 arranged on the jig main body 4 which composes the bent pipe welding jig 1 by restraining the bent pipe 2 from both shifting in the direction of the bent pipe axis C and rotating around the bent pipe axis C. The clamp hole 3 is provided with a first inner peripheral face of curvature 30 which contacts with a part of outer peripheral line R1 of the bent pipe 2 and a second inner peripheral face of curvature 31 which contacts with a part of inner peripheral line R2 of the bent pipe 2. It is also provided with a pair of right and left opposed faces 32 comprising a left side face 32a which contacts with a part of a left side line LS of the bent pipe 2 and a right side face 32b which contacts with a part of a right side line RS. Furthermore, the clamp hole 3 is divided into a left body part 4A and a right body part 4B taking faces 4a, 4b both parallel to a vertical face VF as splitting faces, which includes the bent pipe axis C and connects the outer peripheral line of curvature R1 and the inner peripheral line of curvature R2 of the bent pipe 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bent pipe welding jig, and more particularly to a bent pipe welding jig suitable for clamping one of the bent pipes and welding them when welding the end faces of the bent pipes such as two elbows.

  Conventionally, there has been proposed a pipe welding jig that can be used for tack welding and all-around welding by supporting the end faces of two straight pipes in a state of abutting each other when welding the end faces of two straight pipes. (Patent Document 1).

Japanese Patent Laid-Open No. 11-226783

  This pipe welding jig is shown in FIGS. 15 (a), 15 (b), 16 (a), 16 (b) and 16 (c). In these drawings, the pipe welding jig 50 can support the end faces of two straight pipes in contact with each other, and a main body 51 in which two V blocks 55 and 55 are integrally provided in parallel, Clamps 52, 52 provided on each V block 55, 55, and a set pin 53 provided in the middle of the two V blocks 55, 55 are provided, and the main body 51 has a temporary welding torch. A guide portion 58 including two protrusions 57 and 57 for guiding 72 is provided. The main body 51 is provided with a contact pin, which will be described later, on the side of the main body 51 for positioning the welding head, which will be described later, and is temporarily welded to the electrode of the welding head that is in contact with the contact pin In order to position the butted portion 73 of the tubes 70 and 71, a through hole is provided in the main body 51 in parallel with the V grooves of the V blocks 55 and 55 in the main body 51, and a positioning needle 65 is provided at one end of the through hole. A slide rod 54 having a slide rod knob 66 at the other end is slidably provided. In FIG. 15A, reference numeral 56 denotes a groove having a flat bottom portion, which is formed in an intermediate portion between the V blocks 55 and 55.

  According to the pipe welding jig having the above-described configuration, the set pin knob 53a shown in FIG. 15B is pressed, and the set pin 53 is pushed out from the V-groove as shown in FIG. The clamp knob 63 is rotated in the tightening direction in a state where the end surface of the one tube 70 is pressed against the flat surface of the distal end of the tube, thereby pulling down the one clamp block 62, and the one V block 55 and the one clamp. One tube 70 is fixed to the block 62.

  Next, as shown in FIG. 16 (b), the set pin 53 is pulled down from the V-groove by the set pin knob 53a, the end surface of the other tube 71 is abutted against the end surface of one tube 70, and the other tube 71 is moved to the other side. The clamp block 62 is fixed to the other V block 55. As a result, the butted portion 73 of the pipe is positioned at the center of the main body 51. Next, as shown in FIG. 16 (c), the nozzle of the temporary welding torch 72 is inserted between the two projections 57, 57, and the butted portions 73 of the pipe are temporarily welded at a plurality of positions.

  Next, as shown in FIG. 17A, the slide rod knob 66 of the slide rod 54 is pushed in, the slide rod 54 is moved in the direction of arrow A, the two clamp knobs 63 are loosened, and the tubes 70 and 71 are temporarily moved. The attached butted portion 73 is aligned with the tip of the needle 65. Next, as shown in FIG. 17B, the slide rod 54 is moved in the direction of arrow B, and the welding head 74 is attached to the pipe 71 so as to abut against the contact pin 75 provided in the main body 51, and then welded. The entire circumference of the butted portion 73 can be welded by the electrode 76 provided in the head 74.

  However, in the conventional pipe welding jig, it can be clamped in a state where the end faces of the two straight pipes 70 and 71 are butted together, and can be used to weld the entire circumference of the butted portion 73. Because it is not possible to clamp the curved pipes of the two elbows, the end faces of the curved pipes such as two elbows can not be used to weld the entire circumference of the butted part. In addition, there is a problem that the end face of a deformed pipe such as a tee is butted and the entire circumference of the butted portion cannot be welded.

  The present invention solves such a problem, and an object of the present invention is to be able to securely clamp a curved pipe, and to an end face of the other curved pipe or a deformed pipe such as a tee. Another object of the present invention is to provide a welding jig for a bent pipe that can be used for welding the entire circumference by abutting the end surfaces of the bent pipe.

The present invention is a bending pipe welding jig (1) capable of clamping the bending pipe (2),
This welding jig for curved pipes (1) restrains the movement of the curved pipe (2) in the direction of the curved pipe axis (C) and the rotation around the curved pipe axis (C), and attaches and detaches the curved pipe (2). The jig body (4) is provided with a clamp hole (3) that can be clamped as possible.

  In this way, by clamping the curved pipe by restraining movement in the direction of the curved pipe axis and rotation around the curved pipe axis by the clamp hole of the jig main body, the end face of the other curved pipe or the tee is attached to the end face of the curved pipe. The end surfaces of the deformed pipes such as − can be butted and used for welding the entire circumference of the butted portion.

  In the present invention, the jig body (4) passes through the curved pipe axis (C) of the curved pipe (2), and the curved outer peripheral line (R1) and the curved inner peripheral line (R2) of the curved pipe (2). It is preferable that the planes (4a) and (4b) parallel to the vertical plane (VF) connecting the two are divided so as to be split. By doing in this way, manufacture of a jig | tool main body can be simplified, a manufacturing precision can be raised, and a curved pipe can be clamped reliably with a high clamping force.

  In the present invention, the jig body (4) is passed through the tube bending axis (C) of the curved pipe (2), and the curved outer peripheral line (R1) and the curved inner peripheral line (R2) of the curved pipe (2). A plane (4a1) and (4b1) parallel to the horizontal plane (HF) orthogonal to the vertical plane (VF) connecting the two may be configured to be splittable. Even if it does in this way, manufacture of a jig | tool main body can be simplified, manufacturing accuracy can be raised, and a curved pipe can be clamped reliably with a high clamping force.

  Furthermore, in this invention, the clamp hole (3) provided in the said jig | tool main body (4) is a 1st curvature inner periphery which touches a part of curvature outer periphery line (R1) of the said curved pipe (2). A second curvature inner peripheral surface which is provided opposite to the surface (30) and the first curvature inner peripheral surface (30) and is in contact with a part of the curvature inner peripheral line (R2) of the curved pipe (2). (31) and a pair of left and right opposing surfaces (32) in contact with part of the left and right side lines (LS) and (RS) of the curved pipe (2) are preferable. By doing so, the manufacture of the jig body can be further simplified, and the manufacturing accuracy can be further increased, and by sandwiching a part of the left and right side lines of the curved pipe by the pair of left and right opposing surfaces, The bent tube can be reliably clamped with a higher clamping force.

  The “side lines (LS), (RS)” mean the curved outer peripheral line (R1) and the curved inner peripheral line (R2) of the curved pipe (2) through the curved pipe axis (C) of the curved pipe (2). The horizontal curved surface (HRF) passing through the curved pipe axis (C) perpendicular to the vertical plane (VF) connecting the curved pipe (2) is a trajectory passing through the outer surface of the curved pipe (2).

  Moreover, in this invention, the said jig | tool main body (4) can be attached to the welding head (9) provided with the electrode for main welding (17) in which the perimeter welding of the end surface of the said curved pipe (2) is possible. It is preferable to configure. By doing so, the end face of another curved pipe or the end face of a deformed pipe other than a curved pipe such as a tee is butted against the end face of the curved pipe, and the entire circumference of the butted portion is automatically welded by the main welding electrode. can do.

  According to the present invention, the bent pipe can be reliably clamped by restraining the movement in the direction of the bent pipe axis and the rotation around the bent pipe axis by the clamp hole of the jig body, so that another bent pipe can be clamped on the end face of the bent pipe. The end face of the deformed pipe other than the bent pipe such as the end face or the tee can be butted and used for welding the entire circumference of the butted portion.

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a front view of a jig body, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a sectional view taken along line BB in FIG. (A) is a side view of an elbow that is an example of a bent pipe clamped by the jig body of FIG. 1, FIG. 4 (b) is a view taken along the line DD of FIG. 4 (a), and FIG. FIG.
1 to 3, the bending pipe welding jig 1 is detachable by restraining the movement of the elbow 2 (see FIGS. 4 and 5) in the direction of the curved pipe axis C and the rotation around the curved pipe axis C. It is comprised by the jig | tool main body 4 which provided the clamp hole 3 which can clamp to.

  The clamp hole 3 is provided so as to be opposed to the first curvature inner peripheral surface 30 that is in contact with a part of the curvature outer peripheral line R1 of the elbow 2 and the first curvature inner peripheral surface 30. A second curvature inner circumferential surface 31 in contact with a part of the line R2, and a left side surface 32a in contact with a part of the left side line LS of the elbow 2, and a left side surface 32a. In addition, the elbow 2 has a rectangular cross-sectional shape including a pair of right facing surfaces 32 constituted by a right surface 32b in contact with a part of the right side line RS of the elbow 2.

  The jig body 4 is a disc-shaped member having the clamp hole 3 having the rectangular cross section at the substantially central portion, and is made of, for example, a metal such as Al or an Al-based alloy, as shown in FIGS. The left body portion 4A and the right body are divided into planes 4a and 4b parallel to the longitudinal plane VF that passes through the curved pipe axis C of the elbow 2 and is connected to the curvature outer circumferential line R1 and the curvature inner circumferential line R2. It is divided into a part 4B. Further, the outer periphery of the jig body 4 is formed in a stepped shape having a small diameter portion 5 at the front end portion thereof and a large diameter portion 7 continuous with the small diameter portion 5 via a step surface 6. The left body portion 4A is provided with a fastening bolt insertion hole 8A composed of a horizontal through hole with the inner end facing the left surface 32a and the outer end facing the small diameter portion 5, and the right body portion 4B A fastening bolt insertion hole 8 </ b> B is provided which is formed by a horizontal through hole whose end faces the right surface 32 b and whose outer end faces the small-diameter portion 5. The fastening bolt insertion holes 8A and 8B are used when the jig body 4 is attached to a welding head having a torch described later and fastened with bolts.

  An example of a procedure for using the bending pipe welding jig 1 having the above-described configuration to match the end surfaces of the two elbows 2 and 2 and welding the entire circumference of the butted portion will be described.

  First, as shown in FIG. 6, a front end surface 2a of one elbow 2 shown on the right side and a rear end surface 2b of the other elbow 2 shown on the left side are abutted, and the abutting portion 2A is a temporary welding torch (not shown). ) To form a welded block 20 that is temporarily welded at a plurality of locations. FIG. 6 shows a state in which the butted portions 2A are temporarily welded at four locations at equal intervals in the circumferential direction.

  On the other hand, a welding head 9 shown in FIG. The welding head 9 includes a main body portion 9A and a cap portion 9B that is coupled to the upper portion of the main body portion 9A so as to be openable and closable. The part 9B is provided with a downwardly-facing jig body incorporating recess 10B. The closed state of the cap portion 9B indicated by the solid line is held by engaging the catch clip 11 with the shoulder portion 9b of the cap portion 9B. Further, by releasing the engagement between the catch clip 11 and the shoulder portion 9b, the cap portion 9B can be opened as indicated by a two-dot chain line with the hinge coupling portion 12 as the center of rotation. The main body 9A is provided with a main welding electrode, which will be described later, and a rotation driving mechanism (not shown), and the main welding electrode is driven around the axis C1 by driving the rotation driving mechanism. By rotating, the entire circumference of the butted portion 2A can be welded.

  Next, as shown in FIG. 7B, the jig body 4 is attached to the welding head 9 and fastened with bolts 13. That is, the left body portion 4A of the jig body 4 has the clamp hole 3 facing upward and is assembled into the jig body incorporation recess 10A of the body portion 9A of the welding head 9, and the bolt 13 inserted into the fastening bolt insertion hole 8A is inserted. The left body portion 4A of the jig body 4 is fastened and fixed to the main body portion 9A of the welding head 9 by screwing into the screw hole 14A of the main body portion 9A. At this time, the connecting state of the fastening bolt insertion hole 8A and the screw hole 14A necessary for screwing the bolt 13 is as shown in FIGS. It is obtained by abutting the stepped surface 15 of 10A and rotating slightly around the axis C1 so that the fastening bolt insertion hole 8A and the screw hole 14A correspond to each other concentrically or substantially concentrically.

  As shown in FIG. 7B, when the left body portion 4A of the jig body 4 is fastened and fixed to the main body portion 9A of the welding head 9, the right body portion 4B of the jig body 4 is moved to the clamp hole 3 thereof. The jig body is assembled by inserting the bolt 13 inserted into the fastening bolt insertion hole 8B into the screw hole 14B of the cap portion 9B. The right body part 4B of 4 is fastened and fixed to the cap part 9B of the welding head 9. At this time, as shown in FIG. 3, the connecting state of the fastening bolt insertion hole 8B and the screw hole 14B necessary for screwing the bolt 13 is as follows. It is obtained by abutting the surface 15 and slightly rotating around the axis C1 so that the fastening bolt insertion hole 8B and the screw hole 14B are concentrically or substantially concentric.

  As shown in FIG. 7B, when the jig body 4 is fastened and fixed to the welding head 9, the vicinity of the butted portion 2A of one elbow 2 in the welded block 20 shown in FIG. With the left half of the vertical surface VF (see FIG. 5) facing downward, as shown in FIGS. 8 (a) and 8 (b), it fits into the upward clamp hole 3 in the left body portion 4A of the jig body 4. Then, the abutting portion 2A is projected from the front end surface 40 of the left body portion 4A of the jig body 4 by a predetermined dimension l. Next, the cap portion 9B of the welding head 9 is closed, and as shown in FIG. 7A, the catch clip 11 is engaged with the shoulder portion 9b of the cap portion 9B, and the closed state of the cap portion 9B is maintained. Thereby, as shown in FIGS. 9A and 9B, the right half of the vertical surface VF (see FIG. 5) in the vicinity of the butted portion 2A of one elbow 2 in the welded block 20 shown in FIG. The fitting body 4 is fitted into the downward clamp hole 3 in the right body portion 4B of the jig body 4.

  In this way, the left half of the vertical surface VF in the vicinity of the butted portion 2A of one elbow 2 is fitted into the upward clamp hole 3 in the left body portion 4A of the jig body 4 and the butted one elbow 2 is butted. The right half of the vertical surface VF in the vicinity of the part 2A is fitted into the downward clamp hole 3 in the right body part 4B of the jig body 4, so that a part of the left side line LS in the one elbow 2 is A part of the right side line RS is pinched by a pair of right facing surfaces 32 constituted by a left side surface 32a and a right side surface 32b in contact therewith. As a result, since one elbow 2 can be reliably clamped with a high clamping force, the main welding electrode 17 is rotated around the axis C <b> 1 of the welding head 9 by driving the rotation driving mechanism of the welding head 9. The entire circumference of the butted portion 2A can be welded.

  As in the present embodiment, the clamp hole 3 provided in the jig body 4 has a first curvature inner peripheral surface 30 in contact with a part of the curvature outer peripheral line R1 of one elbow 2, and the first curvature. A second curvature inner circumferential surface 31 provided opposite to the inner circumferential surface 30 and in contact with a part of the curvature inner circumferential line R2 of the elbow 2, and in contact with a part of the left side line LS of one elbow 2. A pair of right facing surfaces 32 each including a left surface 32a and a right surface 32b provided to face the left surface 32a and in contact with a part of the right side line RS of one elbow 2 are provided. The jig body 4 passes through the curved pipe axis C of one elbow 2 and is parallel to the vertical plane VF connecting the outer circumference R1 and the inner radius R2 of the elbow 2. By dividing the surfaces 4a and 4b into left and right body parts 4A and 4B, Since the production of the tool body 4 is simplified and the production accuracy can be improved, a part of the left and right side lines LS, RS of one elbow 2 can be strongly pinched by the pair of left and right opposing surfaces 32. One elbow 2 can be reliably clamped with a high clamping force.

In the above-described embodiment, the jig body 4 passes through the curved pipe axis C of the elbow 2, and the planes 4 a and 4 b parallel to the vertical plane VF connecting the curvature outer peripheral line R 1 and the curvature inner peripheral line R 2 of the elbow 2 are divided surfaces. As shown in FIG. 10 to FIG. 12, the jig body 4 is passed through the curved pipe axis C of the elbow 2 and the elbow is divided into the left body portion 4A and the right body portion 4B. In the structure divided into the upper body part 4C and the lower body part 4D, with the surfaces 4a1 and 4b1 parallel to the horizontal surface HF perpendicular to the vertical surface VF connecting the second curvature outer peripheral line R1 and the curvature inner peripheral line R2 as split surfaces. There may be. 10 to 12, the same parts as those in FIGS.
, (4b1) may be configured to be splittable.

  If it is such a jig | tool main body 4, one elbow 2 can be clamped reliably in the state shown to Fig.13 (a), (b). That is, the first curvature inner peripheral surface 30 and the second curvature inner peripheral surface 31 in the clamp hole 3 strongly sandwich a part of the curvature outer peripheral line R1 of the elbow 2 and a part of the curvature inner peripheral line R2. The elbow 2 with a high clamping force can be reliably clamped. In FIGS. 13 (a) and 13 (b), the same parts as those in FIGS. 8 (a) and 8 (b) are denoted by the same reference numerals, and redundant description is omitted.

  In the embodiment, the left body 4A and the right body 4A are separated from the jig body 4 with the surfaces 4a1 and 4b1 parallel to the longitudinal surface VF of the elbow 2 or the surfaces 4a1 and 4b1 facing the lateral surface HF. 4B or the structure divided into the upper body part 4C and the lower body part 4D. However, the jig body 4 is configured as an integral type that cannot be divided, and the clamp hole 3 is formed in the first curvature inner peripheral surface 30. In addition, a rectangular cross-sectional shape having a second curvature inner peripheral surface 31 and a pair of right opposing surfaces 32, or a circular cross-sectional shape holding the outer periphery of the elbow 2 may be used.

  With such a jig body 4, the jig body 4 is set in advance in the welding head 9 as shown in FIG. 9A, and one of the jig bodies 4 is inserted into the clamp hole 3 of the jig body 4 that is set. The elbow 2 is strongly pressed from the side of the tip surface 2a and press-fitted, and the tip surface 2a is protruded from the jig body 4 by a predetermined dimension l. The movement in the direction of the curved pipe axis C and the rotation around the curved pipe axis C are constrained, the rear end surface 2b of the other elbow 2 is butted against the leading end surface 2a of the constrained one elbow 2, and the butted portion 2A is After the welded block 20 is configured by temporarily welding a plurality of locations with a temporary welding torch, the entire welding of the butt portion 2A is performed by rotating the main welding electrode 17 around the axis C1 of the welding head 9. It can be carried out. When the entire circumference welding of the butt portion 2A is completed, the elbow 2 is strongly pressed and moved toward the rear end face 2c, and then pulled out strongly, thereby removing the block 20 to be welded from the clamp hole 3. Can do.

  Further, in each of the above embodiments, the welding of the welded block 20 constituted by the two elbows 2 and 2 has been described. However, the present invention is not limited to the tip surface 2a of the elbow 2 as shown in FIG. The rear end face 18a of the deformed pipe 18 like-can be butted and used for welding the entire circumference of the butted portion 2A. In FIG. 14, the same parts as those in FIG.

It is a front view which shows one Embodiment of a jig | tool main body. It is an AA arrow line view of FIG. It is the BB sectional view taken on the line of FIG. Fig.4 (a) is a side view which shows one Embodiment of an elbow, FIG.4 (b) is a DD arrow directional view of Fig.4 (a). It is a perspective view which shows one Embodiment of an elbow. It is a side view which shows one Embodiment of a to-be-welded block. Fig.7 (a) is a schematic front view which shows an example of a welding head, FIG.7 (b) is a schematic front view which shows the open state of a cap part. FIG. 8A is a schematic plan view showing a set state of the block to be welded with respect to the main body portion of the welding head, and FIG. 8B is a view taken along the line E-E in FIG. Fig.9 (a) is a schematic plan view which shows the set state of the to-be-welded block with respect to a welding head, FIG.9 (b) is a FF arrow line view of Fig.9 (a). It is a front view which shows other embodiment of a jig | tool main body. It is the GG sectional view taken on the line of FIG. FIG. 10H is a view as viewed from arrow HH. Fig.13 (a) is a schematic plan view which shows the different set state of the to-be-welded block with respect to a welding head, FIG.13 (b) is an II arrow directional view of Fig.13 (a). It is a side view which shows other embodiment of a to-be-welded block. FIG. 15 (a) is a front view of a conventional example, and FIG. 15 (b) is a side view of FIG. 15 (a). 16A is a perspective view of a state where one straight pipe is clamped, FIG. 16B is a perspective view of a state where two straight pipes are butted and clamped, and FIG. 16C is a temporarily attached state of the butted portion. FIG. FIG. 17A is a front view showing the positioning state of the butted portion of the two straight pipes temporarily attached, and FIG. 17B is a front view showing the entire circumference welding state of the butted portions of the two straight pipes. is there.

Explanation of symbols

1 Welding jig for curved pipes 2 Elbow (curved pipe)
3 Clamping hole 4 Jig body 4a Surface parallel to the vertical surface 4a1 Surface facing the horizontal curved surface 4b Surface parallel to the vertical surface 4b1 Surface facing the horizontal curved surface 9 Welding head 17 Electrode for main welding C Pipe curved axis R1 Curvature circumference R2 Curvature inner circumference line LS Left side line RS Right side line VF Vertical surface HF Horizontal surface

Claims (5)

A bending pipe welding jig (1) capable of clamping a bent pipe (2),
This welding jig for curved pipes (1) restrains the movement of the curved pipe (2) in the direction of the curved pipe axis (C) and the rotation around the curved pipe axis (C), and attaches and detaches the curved pipe (2). A bent pipe welding jig comprising a jig body (4) provided with a clamp hole (3) capable of being clamped. In the bending pipe welding jig (1) according to claim 1,
A vertical plane (VF) connecting the outer circumference (R1) of the curved pipe (2) and the inner circumference (R2) of the curved pipe (2) through the curved pipe axis (C) of the curved pipe (2). ) And a curved pipe welding jig characterized in that it can be divided with the planes (4a) and (4b) parallel to the division plane as division planes. In the bending pipe welding jig (1) according to claim 1,
The jig body (4) passes through the tube bending axis (C) of the curved pipe (2), and the longitudinal plane (VF) connecting the curvature outer peripheral line (R1) and the curvature inner peripheral line (R2) of the curved pipe (2). A welding jig for a curved pipe, characterized in that it can be divided with the planes (4a1) and (4b1) parallel to the lateral plane (HF) orthogonal to the plane as a split plane. In the welding jig (1) for curved pipes according to any one of claims 1 to 3,
A clamp hole (3) provided in the jig body (4) has a first curvature inner peripheral surface (30) in contact with a part of the curvature outer peripheral line (R1) of the curved pipe (2), and this A second curvature inner peripheral surface (31) provided opposite to the first curvature inner peripheral surface (30) and in contact with a part of the curvature inner peripheral line (R2) of the curved pipe (2); A bending pipe welding jig comprising a pair of left and right opposing surfaces (32) in contact with part of the left and right side lines (LS) and (RS) of the pipe (2). In the welding jig (1) for curved pipes according to any one of claims 1 to 4,
The jig body (4) is configured to be attachable to a welding head (9) provided with a main welding electrode (17) capable of welding the entire circumference of the end face of the curved pipe (2). Welding jig for curved pipes.

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