Inner positioning tool for girth welding of thin part

Abstract

The invention discloses an inner positioning tool for girth welding of a thin piece. The inner positioning tool comprises a base. The automatic tightening mechanism is composed of a first sleeve, a telescopic air cylinder, a first connecting rod, a first connecting base, a lock nut, a first transmission sleeve, a first transmission rod and a first transmission block, and the manual tightening mechanism is composed of a second sleeve, an end, a second connecting rod, a second connecting base, a lead screw, a second transmission sleeve, a second transmission rod and a second transmission block. The inner supporting tool is composed of a disc, a first supporting block seat and a second supporting block seat. Compared with a traditional local contact cooling scheme, the first supporting block and the second supporting block make full contact with the welding seam of the thin-wall cylinder and the end of the thin-wall cylinder, the cooling effect is good, the problem of welding penetration of the thin-wall part is avoided, and a welded product is small in deformation, small in concentricity change and unstable in quality. The scheme of ventilation protection at the welding seam is adopted, protective gas is saved, the protective effect is poor, the welding quality can be guaranteed, and the welding seam forming device has the advantages of being uniform in welding seam forming and attractive in welding seam.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to an inner positioning tool for thin-piece annular seam welding. Background Art

[0002] In the production of aircraft engine nozzles, it is necessary to assemble and weld two barrels. Due to the requirements of special industries, higher post-welding concentricity and length accuracy are required. Due to the special materials, mostly nickel-based alloys, stainless steel, and titanium alloys, a lot of heat will be generated during the welding process. When the high temperature is cooled, corresponding deformation will occur. The heat is conducted on the workpiece through the tooling, and the heat is quickly dissipated. The less the deformation after welding, the more rapid heat dissipation is required during the welding process to control the deformation. On the other hand, it is also necessary to provide a protective gas on the back of the weld to prevent harmful gases in the air from entering the molten pool and affecting the mechanical properties of the welding. The present invention provides an internal positioning tool for thin-piece circumferential seam welding, which can achieve a reference in the length direction, step-by-step tightening in the circumferential direction, back protective gas, and rapid heat dissipation through one-time clamping, thereby improving welding quality and stability and extending the service life of the tooling.

[0003] The existing technology uses a manual local internal support tooling, and realizes assembly and welding through the overall ventilation of the cylinder. The existing technology has the following problems: 1. The local contact cooling solution has poor cooling effect, large deformation of the workpiece after welding, large change in concentricity, and unstable quality; 2. The overall cylinder ventilation protection solution wastes gas, has poor protection effect, and is difficult to ensure welding quality; 3. The manual welding weld is unevenly formed and the weld is not beautiful. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an internal positioning tool for the circumferential seam welding of two thin-walled cylinder assemblies, which can realize independent tensioning of the two thin-walled cylinder assemblies during welding, and provide cooling and back protection gas during the welding process to improve the welding quality and stability.

[0005] In order to solve the above technical problems, the present invention is implemented by the following technical solutions: an internal positioning tool for thin-piece circumferential seam welding, comprising a base, an automatic tightening mechanism, a manual tightening mechanism and an internal supporting tool; The automatic tightening mechanism is composed of a first sleeve, a telescopic cylinder, a first connecting rod, a first connecting seat, a lock nut, a first transmission sleeve, a first transmission rod and a first transmission block. The cylinder body and the first sleeve of the telescopic cylinder are fixedly mounted on the base. The first sleeve is provided with first oblong holes at the upper and lower ends along its axial direction. The first transmission block is fixedly mounted on the piston rod of the telescopic cylinder by locking with a lock nut. The inner ends of the two first transmission rods are fixedly mounted on the first transmission block. The first transmission rod is also slidably guided and mounted in the first oblong hole. The first transmission sleeve is slidably sleeved and mounted on the first sleeve. The outer ends of the two first transmission rods are fixedly connected to the first transmission sleeve. Several first connecting seats are fixedly mounted on the first transmission sleeve in an annular distribution. The rear end of the first connecting rod is hingedly mounted on the first connecting seat. The manual tightening mechanism consists of a second sleeve, an end head, a second connecting rod, a second connecting seat, a screw rod, a second transmission sleeve, a second transmission rod and a second transmission block, the end head is fixedly mounted on the outer end of the second sleeve, the outer end non-threaded cylindrical section of the screw rod is rotatably mounted on the end head, the upper and lower ends of the second sleeve are provided with second oblong holes along its axial direction, the second transmission block is threadedly connected and mounted on the inner end of the screw rod, the inner ends of the two second transmission rods are fixedly mounted on the second transmission block, the two second transmission rods are also slidably guided and mounted in the second oblong holes, the second transmission sleeve is slidably sleeved and mounted on the second sleeve, the outer ends of the two second transmission rods are also fixedly connected to the second transmission sleeve, a number of second connecting seats are annularly distributed and fixedly mounted on the second transmission sleeve, and the rear end of the second connecting rod is hingedly mounted on the second connecting seat; The inner support tooling is composed of a disc, a first support block seat and a second support block seat, the disc is provided with a plurality of third oblong holes in its radial direction with its axis as the center, the first support block seat and the second support block seat are respectively screwed with a first clamping block and a second clamping block, the smooth cylindrical section of the screw is slidably guided and installed in the third oblong hole, the first support block seat cooperates with the first clamping block to slide and clamp the disc, the second support block seat cooperates with the second clamping block to slide and clamp the disc, the first support block seat and the second support block seat are alternately arranged on both sides of the disc, the first support block seat and the second support block seat are respectively fixedly installed on the outer support surfaces of the first support block seat and the second support block seat, and when the inner support tooling is in the open state, all the first support blocks and the second support blocks form a closed annular structure; The first sleeve, the disc and the second sleeve are coaxially fixedly connected, the front ends of several first connecting seats are hingedly installed on each first support block seat one by one, and the front ends of several second connecting seats are hingedly installed on each second support block seat one by one.

[0006] Preferably, when the inner support tooling is in the expanded state, the first support block and the second support block cooperate to form an arc-shaped annular groove.

[0007] Preferably, when the inner support tooling is in the expanded state, the first support block and the second support block cooperate to form a number of protective gas outlet holes distributed in a circular array, the protective gas outlet holes are located at the center of the arc-shaped annular groove, an air duct connected to the protective gas outlet holes is arranged inside the first support block seat, and a protective gas inlet joint connected to the air duct is arranged on the first support block seat.

[0008] Preferably, a support seat is screwed and fixedly mounted on the base, and the first sleeve and the telescopic cylinder body are both fixedly mounted on the support column.

[0009] Preferably, a first limit stop ring for limiting the movement of the first connecting seat toward the disc is threadedly installed on the first sleeve, and a first limit stop ring for limiting the movement of the second connecting seat toward the disc is threadedly installed on the second sleeve.

[0010] Preferably, the number of the first support block seats and the number of the second support block seats are four respectively.

[0011] Preferably, the first supporting block and the second supporting block are both made of copper.

[0012] Compared with the prior art, the present invention is beneficial in that: 1. Compared with the traditional local contact cooling scheme, the first support block and the second support block of the present invention are in full contact with the welds of the thin-walled cylinder and the end of the thin-walled cylinder, which has the advantages of good cooling effect, no problem of welding through of thin-walled parts, small deformation of the product after welding, small change in concentricity, and unstable quality.

[0013] 2. The present invention adopts a ventilation protection solution at the weld, which saves protective gas and has a good protection effect, so that the welding quality can be guaranteed, and has the advantages of uniform weld formation and beautiful weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings.

[0015] Figure 1 It is a perspective view of the present invention.

[0016] Figure 2 It is the front view of the present invention.

[0017] Figure 3 yes Figure 1 Enlarged structural diagram at M.

[0018] Figure 4 This is a diagram of the positioning structure of two thin-walled cylinder assembly clamps.

[0019] Figure 5 yes Figure 4 AA section view.

[0020] Figure 6 It is the front view of the automatic tensioning mechanism.

[0021] Figure 7 yes Figure 6 BB section view.

[0022] Figure 8 It is the front view of the manual tightening mechanism.

[0023] Fig. 9 yes Figure 8 CC section view.

[0024] Fig.10 This is the main view of the inner support tooling. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with specific embodiments: like Figures 1 to 10 The inner positioning tool for thin-piece circumferential seam welding shown includes a base 1, an automatic tightening mechanism, a manual tightening mechanism and an inner supporting tool; The automatic tightening mechanism is composed of a first sleeve 2, a telescopic cylinder 21, a first connecting rod 22, a first connecting seat 23, a lock nut 24, a first transmission sleeve 26, a first transmission rod 202 and a first transmission block 212. The cylinder body of the telescopic cylinder 21 and the first sleeve 2 are fixedly mounted on the base 1. The first sleeve 2 is provided with first oblong holes 201 along its axial direction at both ends. The first transmission block 212 is fixedly mounted on the piston rod 211 of the telescopic cylinder 21 by locking the lock nut 24. The inner ends of the two first transmission rods 202 are fixedly mounted on the first transmission block 212. The first transmission The rod 202 is also slidably guided and installed in the first oblong hole 201, the first transmission sleeve 26 is slidably sleeved and installed on the first sleeve 2, the outer ends of the two first transmission rods 202 are fixedly connected to the first transmission sleeve 26, and a plurality of first connecting seats 23 are annularly distributed and fixedly installed on the first transmission sleeve 26, and the rear end of the first connecting rod 22 is hingedly installed on the first connecting seat 23; when the piston rod 211 of the telescopic cylinder 21 is extended or retracted, the first transmission block 212, the lock nut 24, the first transmission rod 202, the first transmission sleeve 26, and the first connecting seat 23 are driven to move left and right along the first oblong hole 201; The manual tightening mechanism is composed of a second sleeve 3, an end 31, a second connecting rod 32, a second connecting seat 33, a screw rod 34, a second transmission sleeve 36, a second transmission rod 302 and a second transmission block 311. The end 31 is fixedly mounted on the outer end of the second sleeve 3, the outer end non-threaded cylindrical section of the screw rod 34 is rotatably mounted on the end 31, and the second sleeve 3 is provided with a second oblong hole 301 along its axial direction at the upper and lower ends. The second transmission block 311 is threadedly connected and mounted on the inner end of the screw rod 34. The inner ends of the two second transmission rods 302 are fixedly mounted on the second transmission block 311. The two second transmission rods 302 are also slidably guided and arranged. Installed in the second oblong hole 301, the second transmission sleeve 36 is slidably sleeved and installed on the second sleeve 3, the outer ends of the two second transmission rods 302 are also fixedly connected to the second transmission sleeve 36, and a plurality of second connecting seats 33 are annularly distributed and fixedly installed on the second transmission sleeve 36. The rear end of the second connecting rod 32 is hingedly installed on the second connecting seat 33; the screw rod 34 can only rotate in the end head 31, and the screw rod 34 cannot move along its axial direction in the end head 31. When the screw rod 34 is rotated clockwise or counterclockwise, the combination of the second transmission block 311 of the screw rod 34, the second transmission rod 302, the second transmission sleeve 36 and the second connecting seat 33 moves left and right; The inner support tooling is composed of a disc 4, a first support block seat 5 and a second support block seat 6. The disc 4 is provided with a plurality of third oblong holes 41 in its radial direction with its axis as the center. The first support block seat 5 and the second support block seat 6 are respectively screwed with a first clamping block 51 and a second clamping block 61 by screwing. The smooth cylindrical section of the screw is slidably guided and installed in the third oblong hole 41. The first support block seat 5 cooperates with the first clamping block 51 to slide and clamp the disc 4. The second support block seat 6 cooperates with the second clamping block 61 to slide and clamp the disc 4. The first support block seat 5 and the second support block seat 6 are staggeredly arranged on both sides of the disc 4. The first support block 52 and the second support block 62 are respectively fixedly installed on the outer support surfaces of the first support block seat 5 and the second support block seat 6. When the inner support tooling is in the open state, all the first support blocks 52 and the second support blocks 62 form a closed annular structure. The first sleeve 2, the disc 4 and the second sleeve 3 are coaxially fixedly connected, the front ends of the first connection seats 23 are hingedly mounted on the first support block seats 5, and the front ends of the second connection seats 33 are hingedly mounted on the second support block seats 6. The number of the first support block seats 5 and the number of the second support block seats 6 are respectively set to four. When the first connecting seat 23 moves close to the disk 4, it pushes the combination of the first support block seat 5, the first clamping block 51, the screw and the first support block 52 to move toward the outer edge of the disk 4, and the first support block 52 holds the thin-walled cylinder 101 tightly in place. Conversely, when the first connecting seat 32 moves away from the disk 4, the first support block 52 moves toward the center of the disk 4 to facilitate the assembly and disassembly of the thin-walled cylinder 101; when the second connecting seat 33 moves close to the disk 4, it pushes the combination of the second support block seat 6, the second clamping block 61, the screw and the second support block 62 to move toward the outer edge of the disk 4, and the second support block 62 holds the thin-walled tube end 102 tightly in place. Conversely, when the second connecting seat 33 moves away from the disk 4, the second support block 62 moves toward the center of the disk 4 to facilitate the assembly and disassembly of the thin-walled tube end 102.

[0026] When the inner support fixture is in the open state, the first support block 52 and the second support block 62 cooperate to form an arc-shaped annular groove 7. During welding, the material of the thin-walled cylinder 101 and the thin-walled cylinder end 102 melts and flows into the groove 7 to cool and form, thereby avoiding the problem of welding through of the thin-walled cylinder 101 and the thin-walled cylinder end 102.

[0027] When the inner support tooling is in the open state, the first support block 52 and the second support block 62 cooperate to form a plurality of shielding gas outlet holes 8 distributed in a circular array, and the shielding gas outlet holes 8 are located at the center position of the arc-shaped annular groove 7. An air duct connected to the shielding gas outlet holes 8 is arranged inside the first support block seat 5, and a shielding gas inlet connector 63 connected to the air duct is arranged on the first support block seat 5. The shielding gas inlet connector 63 is connected to the shielding gas pump through a pipeline. The shielding gas outlet holes 8 blow the shielding gas to the welds of the thin-walled cylinder 101 and the thin-walled cylinder end 102. Compared with the traditional overall cylinder ventilation protection solution, it has the advantage of not wasting gas and has a better protection effect, so that the welding quality can be guaranteed.

[0028] A support seat 11 is screwed and fixedly installed on the base 1, and the first sleeve 2 and the telescopic cylinder 21 are fixedly installed on the support column 11, so that the combination of the support seat 11, the first sleeve 2 and the telescopic cylinder 21 can be disassembled for inspection and maintenance.

[0029] The first sleeve 2 is threadedly installed with a first limit stop ring 25 for limiting the movement of the first connecting seat 23 toward the disc 4, and the second sleeve 3 is threadedly installed with a first limit stop ring 35 for limiting the movement of the second connecting seat 33 toward the disc 4. The limiting and blocking effect of the first limit stop ring 25 and the first limit stop ring 35 can prevent the first connecting seat 23 and the second connecting seat 33 from causing excessive travel when the first support block 52 and the second support block 62 are supported outward, thereby causing deformation and damage to the thin-walled cylinder 101 and the thin-walled cylinder end 102.

[0030] The first support block 52 and the second support block 62 are both made of copper. The first support block 52 and the second support block 62 are respectively attached to the inner walls of the thin-walled cylinder 101 and the thin-walled cylinder end 102 to achieve the effect of rapid heat dissipation and cooling when the thin-walled cylinder 101 and the thin-walled cylinder end 102 are welded.

[0031] The automatic tightening mechanism and the manual tightening mechanism respectively drive the first support block 52 and the second support block 62 of the inner support tooling to retract, and the thin-walled cylinder 101 is sleeved on the first support block 52. The automatic tightening mechanism is started to drive the first support block 52 to move outward to tighten and position the thin-walled cylinder 101, and the thin-walled cylinder end 102 is sleeved on the second support block 62, and the thin-walled cylinder end 102 is against the thin-walled cylinder 101. The manual tightening mechanism drives the second support block 62 to move outward to tighten and position the thin-walled cylinder end 102, and the protective gas is discharged. The air hole 8 blows the protective gas to the joint of the thin-walled cylinder 101 and the thin-walled cylinder end 102, and the welding equipment performs welding operation on the joint of the thin-walled cylinder 101 and the thin-walled cylinder end 102. After the welding operation is completed, the automatic tightening mechanism and the manual tightening mechanism respectively drive the first support block 52 and the second support block 62 of the internal support tooling to retract, thereby releasing the supporting effect on the thin-walled cylinder 101 and the thin-walled cylinder end 102, and the welder removes the thin-walled cylinder group formed by welding the thin-walled cylinder 101 and the thin-walled cylinder end 102.

Claims

1. An internal positioning tool for thin-piece circumferential seam welding, characterized in that: It comprises a base (1), an automatic tightening mechanism, a manual tightening mechanism and an internal support tooling; The automatic tightening mechanism comprises a first sleeve (2), a telescopic cylinder (21), a first connecting rod (22), a first connecting seat (23), a lock nut (24), a first transmission sleeve (26), a first transmission rod (202) and a first transmission block (212); the cylinder body of the telescopic cylinder (21) and the first sleeve (2) are fixedly mounted on the base (1); the first sleeve (2) is provided with first oblong holes (201) at the upper and lower ends along its axial direction; the first transmission block (212) is fixedly mounted on the movable part of the telescopic cylinder (21) by locking the lock nut (24). On the plug rod (211), the inner ends of the two first transmission rods (202) are fixedly mounted on the first transmission block (212), the first transmission rods (202) are also slidably guided and mounted in the first oblong hole (201), the first transmission sleeve (26) is slidably sleeved and mounted on the first sleeve (2), the outer ends of the two first transmission rods (202) are fixedly connected to the first transmission sleeve (26), a plurality of first connecting seats (23) are annularly distributed and fixedly mounted on the first transmission sleeve (26), and the rear end of the first connecting rod (22) is hingedly mounted on the first connecting seat (23); The manual tightening mechanism comprises a second sleeve (3), an end head (31), a second connecting rod (32), a second connecting seat (33), a screw rod (34), a second transmission sleeve (36), a second transmission rod (302) and a second transmission block (311); the end head (31) is fixedly mounted on the outer end of the second sleeve (3); the outer end non-threaded cylindrical section of the screw rod (34) is rotatably mounted on the end head (31); the second sleeve (3) is provided with second oblong holes (301) along its axial direction at the upper and lower ends; the second transmission block (311) is threadedly connected and mounted on the second sleeve (3). The inner end of the screw rod (34) and the inner ends of the two second transmission rods (302) are fixedly mounted on the second transmission block (311); the two second transmission rods (302) are also slidably guided and mounted in the second oblong hole (301); the second transmission sleeve (36) is slidably sleeved and mounted on the second sleeve (3); the outer ends of the two second transmission rods (302) are also fixedly connected to the second transmission sleeve (36); a plurality of second connecting seats (33) are annularly distributed and fixedly mounted on the second transmission sleeve (36); and the rear end of the second connecting rod (32) is hingedly mounted on the second connecting seat (33); The inner support fixture is composed of a disc (4), a first support block seat (5) and a second support block seat (6); the disc (4) is provided with a plurality of third oblong holes (41) in its radial direction with its axis as the center; the first support block seat (5) and the second support block seat (6) are respectively screwed with a first clamping block (51) and a second clamping block (61) by screwing; the smooth cylindrical section of the screw is slidably guided and installed in the third oblong holes (41); the first support block seat (5) and the first clamping block (51) are matched The first support block seat (5) and the second support block seat (61) cooperate to slide and clamp the disk (4); the first support block seat (5) and the second support block seat (6) are arranged alternately on two sides of the disk (4); the first support block seat (5) and the second support block seat (6) are respectively fixedly mounted on the outer support surfaces of the first support block seat (5) and the second support block seat (6); when the inner support tooling is in an open state, all the first support blocks (52) and the second support blocks (62) form a closed circular ring structure; The first sleeve (2), the disc (4) and the second sleeve (3) are coaxially fixedly connected, the front ends of the plurality of first connecting seats (23) are hingedly mounted on the first support block seats (5) in a one-to-one correspondence, and the front ends of the plurality of second connecting seats (33) are hingedly mounted on the second support block seats (6) in a one-to-one correspondence.

2. The inner positioning tool for thin-piece circumferential seam welding according to claim 1 is characterized in that: When the inner support tooling is in the open state, the first support block (52) and the second support block (62) cooperate to form an arc-shaped annular groove (7).

3. The inner positioning tool for thin-piece circumferential seam welding according to claim 1 is characterized in that: When the inner support fixture is in the open state, the first support block (52) and the second support block (62) cooperate to form a plurality of protective gas outlet holes (8) distributed in a ring array, the protective gas outlet holes (8) are located at the center of the arc-shaped annular groove (7), an air duct connected to the protective gas outlet holes (8) is arranged inside the first support block seat (5), and a protective gas inlet joint (63) connected to the air duct is arranged on the first support block seat (5).

4. The inner positioning tool for thin-piece circumferential seam welding according to claim 1 is characterized in that: A support seat (11) is screwed and fixedly mounted on the base (1), and the first sleeve (2) and the cylinder body of the telescopic cylinder (21) are both fixedly mounted on the support column (11).

5. The inner positioning tool for thin-piece circumferential seam welding according to claim 1 is characterized in that: A first limit stop ring (25) for limiting the movement of the first connection seat (23) toward the disc (4) is threadedly mounted on the first sleeve (2), and a first limit stop ring (35) for limiting the movement of the second connection seat (33) toward the disc (4) is threadedly mounted on the second sleeve (3).

6. The inner positioning tool for thin-piece circumferential seam welding according to claim 1 is characterized in that: The number of the first support block seats (5) and the number of the second support block seats (6) are respectively four.

7. The inner positioning tool for thin-piece circumferential seam welding according to claim 1 is characterized in that: The first support block (52) and the second support block (62) are both made of red copper.

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