A device for removing a friction welded seam of a pipe

Abstract

This application provides a device for removing friction weld seams from pipe fittings, belonging to the field of metal pipe processing technology. It includes a worktable and a positioning mechanism in its center, which is used to support and position the metal pipe. Two symmetrically arranged punching seats are laterally slidably connected to the worktable, and each end of the worktable has a first cylinder for driving the punching seats to move laterally. Annular punches are provided on the opposite inner surfaces of the two punching seats. Tool support rings are rotatably connected inside each punching seat, and multiple cutters are radially slidably connected to the tool support rings. A feed assembly is provided between the punching seats and the tool support rings to drive the cutters to move radially along the tool support rings. A driving component is provided on the punching seats, which can drive the tool support rings and cutters to rotate and complete the circumferential cutting action on the metal pipe. This application can reduce the possibility of damage to the surface quality of the metal pipe during weld seam removal.

Description

Technical Field

[0001] This application relates to the field of metal pipe processing technology, and specifically to a device for removing friction weld seams from pipe fittings. Background Technology

[0002] Metal pipes generally refer to tubular fittings made of metal materials, with a hollow structure of circular or other cross-sectional shapes. They are widely used for transporting fluids and gases, or as load-bearing components in mechanical structures. In industrial manufacturing, the welding quality of pipe fittings directly affects the system's sealing performance, strength, and service life. Therefore, the connection process for pipe fittings must consider strength, reliability, and production efficiency. Friction welding of pipe fittings refers to a welding process that utilizes the principle of friction welding to achieve a solid-state connection between the ends of metal pipe fittings without the need for solder. Its core mechanism is to align the pipe ends to be connected and apply torque, displacement, and pressure, generating high temperatures at the contact interface and causing plastic deformation, diffusion, and recrystallization of the metal material, thereby forming a continuous, weld-free joint zone. Common forms include: Friction butt welding: Achieving a solid-state connection in the axial direction through end butt welding, typically used for high-strength connections of axially joined pipe fittings. Friction stir welding: Using a stirring head to create a plastic mixing zone at the metal interface, achieving a high-strength connection between dissimilar or homogeneous materials, often used for thin-walled pipes and complex cross-sections. Friction pressure welding: By combining pressure drive with heat input, solid-state metallurgical bonding is achieved in the joint area, which is suitable for high-strength connections of larger pipe fittings.

[0003] Friction butt welding is a welding process that utilizes the heat generated by friction and pressure to achieve a solid bond between the ends of metal parts. Specifically, the two ends to be joined are aligned and brought into contact. Under the combined action of torque, displacement, and pressure, the ends undergo plastic deformation at high temperatures, resulting in mutual diffusion and recrystallization, ultimately forming a continuous, seamless joint. However, in actual friction butt welding processes, the welding area of ​​the metal tube may flare outwards, forming weld burrs. In such cases, it is often necessary to remove the friction weld burrs on the metal tube to improve its surface quality and ensure its proper use in subsequent processes.

[0004] Referring to Chinese patent document CN219786803U, published on October 3, 2023, entitled "A Device for Removing Weld Rings Inside Oil Drill Pipes," the device includes a cylinder, a guide rod, an annular cutter, and a connecting disc. The guide rod is slidably connected to the top of the cylinder, and the annular cutter is connected to the bottom of the cylinder through the guide rod. The connecting disc is connected to the top of the guide rod, and a reverse cutting mechanism for cutting the other side of the weld ring is connected between the connecting disc and the cylinder. During weld ring removal, the arc-shaped cutter can cut the weld ring inside the oil drill pipe from bottom to top, while the annular cutter cuts it from top to bottom, thus achieving simultaneous removal of the weld ring in two directions and improving the smoothness of the weld cut.

[0005] Referring to the above technical solution, since the weld thickness of each pipe fitting is different, when the thicker weld is removed by punching, the weld will often undergo plastic deformation to the other side after being subjected to pressure from the punch. It will only break and separate from the metal pipe when the deformation of the weld reaches its limit. In this case, a large number of burrs will often be generated at the cut position of the weld, and the weld position of the metal pipe may also have uneven cuts, which will affect the surface quality of the metal pipe. Summary of the Invention

[0006] In view of this, this application provides an apparatus for removing friction weld seams from pipe fittings, mainly used to solve the problem that the surface quality of metal pipes is easily affected when using conventional punching methods to remove friction weld seams.

[0007] To solve the above-mentioned technical problems, this application provides a device for removing friction welds from pipe fittings, including a worktable and a positioning mechanism in the middle of the worktable. The positioning mechanism is used to support and position the metal pipe. Two punching seats are symmetrically arranged on the left and right sides and are laterally slidably connected on the worktable. A first cylinder is provided at both ends of the worktable to drive the punching seats to move laterally. The inner surfaces of the two punching seats are provided with annular punches. A tool support ring is rotatably connected inside the two punching seats. Multiple cutters are radially slidably connected on the tool support ring. A feed assembly is provided between the punching seat and the tool support ring to drive the cutters to move radially along the tool support ring. A driving component is provided on the punching seat. The driving component can drive the tool support ring and the cutters to rotate and complete the circumferential cutting action on the metal pipe.

[0008] By adopting the above technical solution, for the removal of thicker welds on metal pipes, the first cylinder drives the cutting seat to move towards the metal pipe, causing the annular punch to contact the weld axially, completing the initial removal and peeling of the weld through punching. Then, the first cylinder drives the cutting seat to continue approaching the metal pipe, allowing the weld to penetrate deeper into the cutting seat and align with the cutter. At this point, the coordinated operation of the feed assembly ensures the steady advance of the cutter, guaranteeing the accuracy of the cutting depth and position. Subsequently, the drive unit rotates the tool support ring and the cutter together, causing the cutter to perform circumferential cutting on the remaining thinner welds and edge burrs on the metal pipe, thus achieving a more uniform removal effect. Compared to single punching, the two-stage circumferential cutting structure allows for better control of load distribution, reduces the risk of damage to the surrounding material, and also reduces the burden of subsequent grinding, improving the overall production efficiency and weld removal quality of the metal pipe, ensuring the final quality of the finished metal pipe product.

[0009] Optionally, the cutting edge of the blade is provided with arc-shaped edges at both the left and right ends, and the arc-shaped edges can abut against the outer arc surface of the metal tube.

[0010] By adopting the above technical solution, during the cutting process, as the weld circumferential cutting work unfolds, the arc-shaped edge on the cutting edge will gradually contact and abut against the outer arc surface of the metal tube, thus acting as a cutting limit for the cutting tool. This prevents the tool from excessively cutting and causing unnecessary cutting on the outer arc surface of the metal tube. Through this limiting mechanism, it can be ensured that the circumferential cutting work is completed in the weld area without excessive cutting of the surface of the metal tube, thereby improving the final product quality of the metal tube.

[0011] Optionally, the feed assembly includes multiple radial through slots circumferentially arrayed on the tool support ring. A hollow transition block is slidably connected inside each radial through slot. The cutter corresponds one-to-one with the hollow transition block and is slidably connected inside the hollow transition block. A trapezoidal block is slidably connected laterally inside each hollow transition block, and the trapezoidal block and the cutter can abut against each other in a beveled manner. A second cylinder is provided on the punching seat. The actuating end of the second cylinder is provided with a pressure ring sleeved on the outside of the tool support ring. Each trapezoidal block has a notch for the pressure ring to be inserted.

[0012] By adopting the above technical solution, when the cutting action needs to be completed, the second cylinder pushes the pressure ring to move laterally, causing the trapezoidal block in the notch to move accordingly. Due to the inclined surface cooperation and abutment relationship formed between the trapezoidal block and the cutting blade, the cutting blade can move towards the metal tube along the radial direction of the tool support ring inside the hollow transition block and complete the cutting action, ensuring the smooth progress of the subsequent circumferential cutting process.

[0013] Optionally, the driving component includes a servo motor mounted on the punching seat, a drive gear mounted on the output shaft of the servo motor, and a driven gear mounted on the tool support ring that can mesh with the drive gear.

[0014] By adopting the above technical solution, when the servo motor drives the active gear to rotate, the cutter support ring can drive the cutter to rotate together under the transmission action of the meshing of the active gear and the driven gear, thereby performing circumferential cutting on the thin weld seam remaining on the metal tube to achieve a uniform and continuous removal effect.

[0015] Optionally, the annular punches are detachably connected to the punching seat by bolts. The opposing surfaces of the two annular punches are provided with annular grooves. The inner arc wall of the annular groove on the side away from the central axis of the annular punch is inclined from the outside to the inside towards the central axis of the annular punch. The hollow transition block is slidably connected to the radial through groove by a tension spring. The hollow transition block is provided with a protrusion that can be inserted into the annular groove.

[0016] By adopting the above technical solution, operators can manually disassemble and replace the annular punch during the processing of metal pipes of different diameters. Furthermore, when installing annular punches of other sizes, the protruding pin will gradually insert into the annular groove along its inclined inner arc wall, causing relative displacement of the hollow transition block. This allows the initial position of the cutter to be adaptively adjusted according to the size of the selected annular punch, thus providing an efficient and accurate positioning basis for subsequent circumferential cutting.

[0017] Optionally, the bottom of the two discharge ports in the middle of the workbench is provided with slag discharge chambers. The two slag discharge chambers are symmetrically arranged and can guide the weld slag punched off the metal pipe to the outside of the workbench.

[0018] By adopting the above technical solution, during the removal of weld seams in metal pipes, the removed weld waste enters the slag discharge bin through the discharge port in the middle of the workbench, and then flows along the slag discharge bin to the externally preset recycling container for recycling, keeping the work area clean and facilitating the subsequent recycling and treatment of weld waste.

[0019] Optionally, each of the punching seats is equipped with an air blowing mechanism to blow out the weld slag remaining inside the punching seat.

[0020] Optionally, the air blowing mechanism includes an annular air guide plate disposed inside the punching seat, an air supply pipe communicating with the inner cavity of the annular air guide plate is disposed through the punching seat, the annular air guide plate is sleeved outside the tool support ring and communicates with the air blowing holes circumferentially arrayed on the tool support ring, and a slag baffle is disposed inside the punching seat.

[0021] By adopting the above technical solution, during the removal of weld seams in metal pipes, external compressed gas enters through the gas supply pipe and is blown out through the air blowing hole of the annular air guide plate in order to clean the weld waste in the punching seat cavity and on the surface of the metal pipe. The slag baffle can guide and limit the weld waste, ensuring that it falls smoothly into the slag discharge bin and avoids residue affecting subsequent punching operations.

[0022] Optionally, the positioning mechanism includes a bearing ring disposed in the middle of the worktable, a third cylinder disposed in the middle of the worktable, and a clamping ring disposed at the actuating end of the third cylinder corresponding longitudinally to the bearing ring. The clamping ring cooperates with the bearing ring to complete the clamping and positioning of the metal tube.

[0023] By adopting the above technical solution, when removing the friction weld on the metal pipe, the metal pipe is first placed in the internal space of the bearing ring. Then, the third cylinder drives the clamping ring to move along a predetermined trajectory, so that the clamping ring gradually approaches the bearing ring until the clamping ring and the bearing ring are tightly fitted and firmly clamp the metal pipe. This prevents the metal pipe from shifting in the subsequent weld removal and punching process and improves the punching quality of the weld.

[0024] Optionally, linear drive components are provided at both ends of the worktable, and the execution end of each linear drive component is provided with an electric heating coil that can be sleeved on the outside of the metal tube.

[0025] By adopting the above technical solution, before the metal tube friction weld seam is removed, the linear drive component can drive the electric heating coil to move along the outer surface of the metal tube and be placed on the metal tube to heat it, so that the internal stress generated in the tube during the friction welding process is released, reducing the probability of deformation or cracking caused by punching force during subsequent weld seam removal, and improving processing stability and weld seam removal quality.

[0026] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0027] 1. When removing friction welds from metal pipes, the method can combine axial punching and circumferential circumferential cutting to effectively remove the friction welds. Compared to the conventional method of removing metal pipe welds by single punching, the punching force and stress can be more evenly distributed around the weld, reducing the risk of local damage and microcracks to the surrounding material and reducing the possibility of quality damage to the metal pipe during weld removal. Furthermore, by using circumferential cutting as a superior alternative to grinding, the burden of subsequent weld grinding work can be reduced, thereby improving the overall production efficiency of metal pipes.

[0028] 2. Personnel can freely assemble and disassemble the annular punch according to the diameter of the metal pipe to be processed. When installing annular punches of other sizes, the initial position of the cutter used for subsequent circumferential cutting can be adaptively adjusted according to the size of the annular punch, thereby providing an efficient and accurate positioning basis for subsequent circumferential cutting work and further improving the overall efficiency of metal pipe weld removal.

[0029] 3. During the removal of weld seams from metal pipes, external compressed gas can be sent into the punching seat through the gas supply pipe to clean the weld waste inside the punching seat cavity and on the surface of the metal pipe. At the same time, the slag baffle plate plays a guiding and limiting role, ensuring that the weld waste reliably falls into the slag discharge bin and avoids the residue from affecting subsequent punching operations. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a device for removing friction weld seams from pipe fittings according to this application;

[0031] Figure 2 This is a cross-sectional view of the punching seat of this application;

[0032] Figure 3 This is an exploded view of the annular punch, tool support ring, and cutter of this application;

[0033] Figure 4 This is a sectional view of the workbench of this application;

[0034] Figure 5 This is a front-view sectional view of the punching seat of this application;

[0035] Figure 6 This is a top view of the workbench of this application;

[0036] Figure 7 This is a schematic diagram of the positioning mechanism of this application;

[0037] Figure 8 This is a schematic diagram of the linear drive assembly and electric heating coil of this application.

[0038] Explanation of reference numerals in the attached drawings: 1. Workbench; 11. Slag discharge bin; 12. Linear drive assembly; 13. Electric heating coil; 2. Positioning mechanism; 21. Bearing ring; 22. Third cylinder; 23. Clamping ring; 3. Punching seat; 31. First cylinder; 32. Annular punch; 321. Annular groove; 33. Tool support ring; 34. Cutting blade; 341. Arc edge; 35. Feed assembly; 351. Radial through groove; 352. Hollow transition block; 353. Trapezoidal block; 354. Second cylinder; 355. Pressure ring; 356. Notch; 36. Drive component; 361. Servo motor; 362. Drive gear; 363. Driven gear; 4. Tension spring; 5. Protruding pin; 6. Air blowing mechanism; 61. Annular air guide plate; 62. Air supply pipe; 63. Air blowing hole; 64. Slag baffle plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will be combined with the embodiments of this application. Figures 1-8 The technical solutions of the embodiments of this application are clearly and completely described herein. All other embodiments obtained by those skilled in the art based on the described embodiments are within the scope of protection of this application.

[0040] Reference Figure 1 and Figure 7 This embodiment provides an apparatus for removing friction weld seams from pipe fittings, including a workbench 1 and a positioning mechanism 2 and a punching mechanism disposed above it. The positioning mechanism 2 is used to support and position the metal pipe. The positioning mechanism 2 includes a support ring 21, a third cylinder 22, and a clamping ring 23. The support ring 21 is disposed in the middle of the workbench 1, the third cylinder 22 is disposed in the middle of the workbench 1, and the clamping ring 23 is disposed at the actuating end of the third cylinder 22 and longitudinally corresponds to the support ring 21. The clamping ring 23 cooperates with the support ring 21 to clamp and position the metal pipe.

[0041] When removing the friction weld on the metal pipe, the metal pipe is first placed inside the bearing ring 21. Then, the third cylinder 22 moves to drive the clamping ring 23 to move closer to the bearing ring 21. Finally, the clamping ring 23 will cooperate with the bearing ring 21 to clamp and position the metal pipe, so as to prevent the metal pipe from shifting during the subsequent weld punching process and affecting the punching quality.

[0042] Among them, reference Figure 1 , Figure 2 , Figure 3 and Figure 5 The punching mechanism includes a punching seat 3, a first cylinder 31, an annular punch 32, a tool support ring 33, a cutter 34, a feed assembly 35, and a drive component 36. Two punching seats 3 are symmetrically arranged on the worktable 1 in a lateral sliding connection. Two first cylinders 31 are arranged symmetrically at the left and right ends of the worktable 1. The first cylinders 31 can drive the punching seats 3 to move laterally. The inner surfaces of the two punching seats 3 are provided with annular punches 32. The tool support rings 33 are rotatably connected inside the two punching seats 3. The feed assembly 35 is arranged between the punching seats 3 and the tool support rings 33 and can drive the cutter 34 to move radially along the tool support rings 33. The feed assembly 35 includes a radial through groove 351, a hollow transition block 352, a trapezoidal block 353, a second cylinder 354, a pressure ring 355, and a notch 356. Multiple radial through grooves 351 are formed in a circumferential array on the tool support rings 33. A hollow transition block 352 is slidably connected inside each radial through groove 351. The cutter 34 corresponds one-to-one with the hollow transition block 352. Furthermore, a slidable connection is made inside the hollow transition block 352. Each hollow transition block 352 has a trapezoidal block 353 slidably connected inside, and the trapezoidal block 353 and the cutter 34 can abut against each other in a beveled manner. The second cylinder 354 is set on the punching seat 3, and the pressure ring 355 is set on the execution end of the second cylinder 354 and can be sleeved on the outside of the tool support ring 33. Each trapezoidal block 353 has a notch 356 for the pressure ring 355 to be inserted. The driving member 36 is set on the punching seat 3, and the driving member 36 can drive the tool support ring 33 and the cutter 34 to rotate and complete the circumferential cutting action on the metal tube. The driving member 36 includes a servo motor 361, a drive gear 362 and a driven gear 363. The servo motor 361 is set on the punching seat 3, the drive gear 362 is set on the output shaft of the servo motor 361, and the driven gear 363 is set on the tool support ring 33 and can mesh with the drive gear 362.

[0043] Once the metal tube is positioned, for the removal of thicker weld seams on the metal tube, the first cylinder 31 drives the punching seat 3 to move towards the metal tube. At this time, the annular punch 32 will contact the weld seam of the metal tube along the axial direction of the metal tube, thereby completing the initial removal of the weld seam of the metal tube. At this time, a thinner weld seam will still remain on the metal tube, and uneven cuts and burr residues that occur during punching will occur on this thinner weld seam. Then, the first cylinder 31 drives the punching seat 3 to continue approaching the metal tube. When the weld seam of the metal tube enters the punching seat 3 and corresponds to the cutter 34, the second cylinder 354 operates, causing the pressure ring 355 to move laterally. At this time, the trapezoidal block 353 located inside the notch 356 will move along with the pressure ring 355. Due to the inclined surface matching and abutting relationship between the trapezoidal block 353 and the cutter 34, the cutter 34 can move towards the metal tube along the radial position of the tool support ring 33 inside the hollow transition block 352 to complete the cutting action. Then, the servo... The motor 361 drives the drive gear 362 to rotate. Under the influence of the meshing connection between the drive gear 362 and the driven gear 363, the tool support ring 33 will rotate and drive the cutter 34 to rotate together to perform circumferential cutting on the thin weld seam remaining on the metal tube. Compared with the conventional method of removing the weld seam of the metal tube by single punching, the two-stage circumferential cutting method can reduce the possibility of quality damage to the metal tube during the weld seam removal work. In addition, the circumferential cutting method can also reduce the burden of subsequent weld seam grinding, thereby improving the overall production efficiency of the metal tube.

[0044] Additionally, refer to Figure 3 The cutting blade 34 has arc-shaped edges 341 on both the left and right ends, and the arc-shaped edges 341 can abut against the outer arc surface of the metal tube.

[0045] During the cutting process of the cutter 34, as the weld circumferential cutting work is carried out, the arc-shaped edge 341 at the cutting edge of the cutter 34 will eventually come into contact with the outer arc surface of the metal tube, thus serving as a cutting limit for the cutter 34. This prevents the cutter 34 from over-cutting and causing unnecessary cutting to the outer arc surface of the metal tube after the weld circumferential cutting action is completed, thereby improving the final quality of the metal tube.

[0046] Reference Figure 2 and Figure 3 The annular punches 32 are detachably connected to the punching seat 3 by bolts. The opposing surfaces of the two annular punches 32 are provided with annular grooves 321. The inner arc wall of the annular groove 321 on the side away from the central axis of the annular punch 32 is inclined from the outside to the inside towards the central axis of the annular punch 32. The hollow transition block 352 is slidably connected to the radial through groove 351 by tension spring 4. The hollow transition block 352 is provided with a protruding pin 5 that can be inserted into the annular groove 321.

[0047] When processing metal pipes of different diameters, the annular punch 32 can be manually disassembled and replaced. When the annular punch 32 is removed, the tension spring 4 can prevent the hollow transition block 352 from slipping and falling out of the radial through groove 351. When annular punches 32 of other sizes are installed on the punching seat 3, the protruding pin 5 will gradually insert into the annular groove 321 along the inclined inner arc wall of the annular groove 321. During this process, the hollow transition block 352 will be relatively displaced according to the size of the annular punch 32, so that the initial position of the cutter 34 can be adaptively adjusted according to the size of the annular punch 32 (that is, the initial position of the cutter 34 can correspond to the inner diameter position of the annular punch 32 of any size), so as to facilitate the efficient operation of subsequent circumferential cutting.

[0048] Reference Figure 1 and Figure 4 The bottom of the two discharge ports in the middle of the workbench 1 is equipped with a slag discharge chamber 11. The two slag discharge chambers 11 are symmetrically arranged on the left and right and can guide the weld waste slag punched off the metal pipe to the outside of the workbench 1.

[0049] During the removal of weld seams from metal pipes, the removed weld waste enters the slag discharge bin 11 through the discharge port in the middle of the workbench 1. Then, the weld waste enters the pre-prepared recycling container outside the slag discharge bin 11, which helps to keep the work area clean.

[0050] Reference Figure 2 and Figure 5 Each punching seat 3 is equipped with an air blowing mechanism 6 to blow out the weld slag remaining inside the punching seat 3. The air blowing mechanism 6 includes an annular air guide plate 61, an air supply pipe 62, air blowing holes 63, and a slag baffle plate 64. The annular air guide plate 61 is located inside the punching seat 3. The air supply pipe 62 passes through the punching seat 3 and communicates with the inner cavity of the annular air guide plate 61. The annular air guide plate 61 is sleeved on the outside of the tool support ring 33 and communicates with the air blowing holes 63 arranged in a circumferential array on the tool support ring 33. The slag baffle plate 64 is located inside the punching seat 3.

[0051] During the removal of weld seams from metal pipes, personnel can introduce external compressed gas into the gas supply pipe 62. The compressed gas will then pass through the gas supply pipe 62 and the annular air guide plate 61 in sequence and be discharged from the air blowing hole 63, thereby blowing the weld waste residue attached to the inner cavity of the punching seat 3 and the metal pipe out of the punching seat 3. This prevents a large amount of weld waste residue from remaining in the inner cavity of the punching seat 3, which would affect the normal progress of subsequent punching work. The slag baffle 64 can guide and limit the weld waste residue, allowing it to fall normally into the slag discharge bin 11.

[0052] Reference Figure 1 , Figure 6 and Figure 8Linear drive components 12 are provided at both ends of the workbench 1, and each of the linear drive components 12 is provided with an electric heating coil 13 that can be sleeved on the outside of the metal tube. The linear drive component 12 consists of a longitudinally arranged linear motor and a transversely arranged linear motor. The two linear motors cooperate with each other to enable the electric heating coil 13 to move freely within the same horizontal height.

[0053] Before removing the friction weld of the metal pipe, the linear drive assembly 12 can drive the electric heating coil 13 to move so that it is placed outside the metal pipe and heats the metal pipe. This releases the internal stress generated by the rapid plastic deformation and subsequent rapid cooling of the metal pipe during the friction welding process, thereby reducing the probability of the metal pipe deforming or cracking due to the punching force during the subsequent weld removal process.

[0054] The implementation principle of the device for removing friction weld seams from pipe fittings according to an embodiment of this application is as follows:

[0055] When removing the friction weld on the metal pipe, the operator first places the metal pipe inside the bearing ring 21, and then drives the clamping ring 23 to move closer to the bearing ring 21 through the third cylinder 22. With the cooperation of the clamping ring 23 and the bearing ring 21, the metal pipe is clamped and positioned to prevent the metal pipe from shifting during the subsequent weld cutting process.

[0056] Then, the linear drive assembly 12 drives the electric heating coil 13 to move, so that the electric heating coil 13 is sleeved on the outside of the metal tube and heats the metal tube. This releases the internal stress generated by the rapid plastic deformation and rapid cooling of the metal tube during the friction welding process, and reduces the possibility of deformation or cracking of the metal tube due to the interaction of punching force and its own internal stress during the subsequent weld removal process.

[0057] Then, when removing the thicker weld seam on the metal pipe, the first cylinder 31 drives the punching seat 3 to move towards the metal pipe. At this time, the annular punch 32 will contact the weld seam of the metal pipe along the axial direction of the metal pipe to complete the initial removal of the weld seam of the metal pipe. At this time, a thinner weld seam will still remain on the metal pipe, and uneven cuts and burr residues will occur on this thinner weld seam.

[0058] Subsequently, the first cylinder 31 drives the punching seat 3 to continue approaching the metal tube. When the weld seam of the metal tube enters the punching seat 3 and corresponds to the cutter 34, the second cylinder 354 operates, causing the pressure ring 355 and the trapezoidal block 353 to move laterally together. Due to the inclined surface matching and abutting relationship between the trapezoidal block 353 and the cutter 34, the cutter 34 can move closer to the metal tube along the radial position of the tool support ring 33 inside the hollow transition block 352 to complete the cutting action. Then, the servo motor 361 operates, driving the drive gear 362 to rotate. Under the influence of the meshing connection between the drive gear 362 and the driven gear 363, the tool support ring 33 will rotate accordingly and drive the cutter 34 to rotate together to perform circumferential cutting on the thin weld seam remaining on the metal tube.

[0059] In addition, during the removal of weld seams from metal pipes, personnel can introduce external compressed gas into the air supply pipe 62. The compressed gas will then pass through the air supply pipe 62 and the annular air guide plate 61 in sequence and be discharged from the air blowing hole 63, thereby blowing out the weld waste residue attached to the inner cavity of the punching seat 3 and the metal pipe from the punching seat 3. This is to prevent a large amount of weld waste residue from remaining in the inner cavity of the punching seat 3, which would affect the normal progress of subsequent punching work. The blown-out weld waste residue will enter the slag discharge bin 11 through the discharge port in the middle of the workbench 1. Then, the weld waste residue will enter the pre-prepared external recycling container along the slag discharge bin 11.

[0060] When processing metal pipes of different diameters, the personnel can manually disassemble and replace the annular punch 32. When an annular punch 32 of other sizes is installed on the punching seat 3, the protruding pin 5 will gradually insert into the annular slide groove 321 along the inclined inner arc wall of the annular slide groove 321. During this process, the hollow transition block 352 will be relatively displaced according to the size of the annular punch 32, so that the initial position of the cutter 34 can be adaptively adjusted according to the size of the annular punch 32, so as to carry out the subsequent circumferential cutting work efficiently.

[0061] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An apparatus for removing friction weld seams from pipe fittings, comprising a worktable and a positioning mechanism disposed in the middle thereof, the positioning mechanism being used to support and position the metal pipe, characterized in that: Two symmetrically arranged punching seats are laterally slidably connected to the worktable. Each end of the worktable has a first cylinder for driving the lateral displacement of the punching seats. Annular punches are provided on the opposite inner surfaces of the two punching seats. Tool support rings are rotatably connected inside each punching seat. Multiple cutters are radially slidably connected to the tool support rings. A feed assembly is provided between the punching seats and the tool support rings to drive the cutters to move radially along the tool support rings. A driving component is provided on the punching seats, which can drive the tool support rings and cutters to rotate and complete the cutting process. The circumferential cutting action of the metal tube; the feed assembly includes multiple radial through slots circumferentially arrayed on the tool support ring, and a hollow transition block is slidably connected inside each radial through slot. The cutter corresponds one-to-one with the hollow transition block and is slidably connected inside the hollow transition block. A trapezoidal block is slidably connected laterally inside each hollow transition block, and the trapezoidal block and the cutter can abut against each other in a beveled manner. A second cylinder is provided on the punching seat, and a pressure ring is provided on the actuating end of the second cylinder, which is sleeved on the outside of the tool support ring. Each trapezoidal block has a notch for the pressure ring to be inserted.

2. The apparatus for removing friction weld seams from pipe fittings according to claim 1, characterized in that: The cutting blade has arc-shaped edges at both ends, and these arc-shaped edges can abut against the outer arc surface of the metal tube.

3. The apparatus for removing friction weld seams from pipe fittings according to claim 1, characterized in that: The driving component includes a servo motor mounted on the punching seat, a drive gear mounted on the output shaft of the servo motor, and a driven gear mounted on the tool support ring that can mesh with the drive gear.

4. The apparatus for removing friction weld seams from pipe fittings according to claim 1, characterized in that: The annular punches are detachably connected to the punching seat by bolts. The opposing surfaces of the two annular punches are provided with annular grooves. The inner arc wall of the annular groove on the side away from the central axis of the annular punch is inclined from the outside to the inside towards the central axis of the annular punch. The hollow transition block is slidably connected to the radial through groove by a tension spring. The hollow transition block is provided with a protrusion that can be inserted into the annular groove.

5. The apparatus for removing friction weld seams from pipe fittings according to claim 1, characterized in that: The two discharge ports in the middle of the workbench are equipped with slag discharge chambers at their bottoms. The two slag discharge chambers are symmetrically arranged and can guide the weld waste slag punched off the metal pipe to the outside of the workbench.

6. The apparatus for removing friction weld seams from pipe fittings according to claim 1, characterized in that: Each punching seat is equipped with an air blowing mechanism to blow out the weld waste residue remaining inside the punching seat.

7. The apparatus for removing friction weld seams from pipe fittings according to claim 6, characterized in that: The air blowing mechanism includes an annular air guide plate disposed inside the punching seat. An air supply pipe communicating with the inner cavity of the annular air guide plate is disposed through the punching seat. The annular air guide plate is sleeved on the outside of the tool support ring and communicates with the air blowing holes circumferentially arrayed on the tool support ring. A slag baffle is disposed inside the punching seat.

8. The apparatus for removing friction weld seams from pipe fittings according to claim 1, characterized in that: The positioning mechanism includes a bearing ring located in the middle of the worktable, a third cylinder located in the middle of the worktable, and a clamping ring located at the actuating end of the third cylinder that corresponds longitudinally to the bearing ring. The clamping ring and the bearing ring cooperate to clamp and position the metal tube.

9. The apparatus for removing friction weld seams from pipe fittings according to claim 1, characterized in that: Linear drive components are provided at both ends of the workbench, and each of the linear drive components has an electric heating coil that can be sleeved on the outside of the metal tube.

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