Clamp for abrasive flow polishing of large-diameter seamless tube

Abstract

The fixture comprises a positioning seat, a coaxial transmission assembly, a main expansion head and an auxiliary expansion head, a motor seat drives a main shaft rod to rotate, the main shaft rod penetrates through the coaxial transmission assembly and is in sliding connection with the auxiliary expansion head through a flange connector, and the main shaft rod is sleeved with a core taper sleeve; and the taper expansion surface of the core taper sleeve is in sliding contact with the wedge surfaces of the main and auxiliary expansion heads. Through meshing linkage of driving teeth, transmission teeth and output teeth in the coaxial transmission assembly, synchronous reverse rotation of the main expansion head and the auxiliary expansion head is achieved, and reliable clamping is generated in opposite movement in cooperation with a spiral edge and spiral groove staggered meshing structure on the surfaces of the main expansion head and the auxiliary expansion head. The main expansion head and the auxiliary expansion head are made of elastic alloy materials, the spiral edges can generate elastic deformation when being stressed so as to compensate pipe diameter deviation, and clamping adaptability is guaranteed. According to the fixture, automatic clamping and loosening can be achieved, the clamping efficiency and stability are improved, and the uniformity and machining quality of abrasive flow polishing are improved.

Description

Technical Field

[0001] This invention relates to the field of pipe processing equipment technology, specifically a fixture for abrasive flow polishing of large-diameter seamless pipes. Background Technology

[0002] Large-diameter seamless pipes are widely used in aerospace, energy equipment, and large pressure pipelines due to their large inner diameter and high structural strength requirements. The quality of their inner wall processing directly affects subsequent fluid characteristics and service life; therefore, abrasive flow polishing is typically used to perform high-precision treatment on the pipe's inner wall during manufacturing. However, the clamping and fixing of the seamless pipe before abrasive flow polishing remains a crucial step limiting the stability and efficiency of the process.

[0003] In existing technologies, the following methods are commonly used for clamping large-diameter seamless tubes: Most existing clamps rely on operators to manually tighten or install bolts and pressure plates to fix pipe fittings. This method is cumbersome, time-consuming, and the clamping force depends on manual control, which can easily lead to uneven tightness or insufficient repeatability, thus compromising the stability and consistency of the processing.

[0004] Some clamps use rigid expansion sleeves or mechanical wedges to expand the clamps and secure seamless pipes. While this type of structure can achieve a certain degree of automated clamping, it lacks flexible compensation capabilities, often requiring the replacement of clamping components of different sizes for pipe fittings. Furthermore, when there are dimensional deviations in the inner diameter of the pipe fitting, the rigid clamping head can easily lead to uneven clamping, resulting in slippage or damage to the pipe wall.

[0005] In abrasive flow polishing, most existing fixtures use a fixed-angle mounting method for workpiece clamping, lacking an angle adjustment mechanism. This makes it difficult to match the flow direction of the abrasive flow with the pipe orientation during actual polishing, easily leading to insufficient flow velocity or dead zones in certain areas, thus affecting the uniformity of the inner wall polishing and the surface quality.

[0006] In summary, existing large-diameter seamless tube clamping technologies generally suffer from the following shortcomings: they rely on manual operation, resulting in low efficiency and poor stability; they lack adaptability, cannot be compatible with seamless tubes of various specifications, and have insufficient clamping reliability; and they lack angle adjustment functions, leading to unreasonable abrasive flow trajectories during polishing and making it difficult to guarantee processing quality.

[0007] Therefore, there is an urgent need for a fixture for abrasive flow polishing of large-diameter seamless tubes that can achieve automatic clamping, has elastic compensation function, and can flexibly adjust the clamping angle, in order to overcome the above-mentioned shortcomings and improve the processing quality. Summary of the Invention

[0008] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0009] Therefore, the technical solution adopted in this invention is as follows: a fixture for abrasive flow polishing of large-diameter seamless tubes, comprising core components such as a positioning seat, a coaxial transmission assembly, a main expansion head, and a secondary expansion head. The main spindle is rotated by a motor base, and the radial expansion and contraction of the main and secondary expansion heads are achieved through the sliding engagement of the mandrel sleeve and the wedge surface, thereby realizing automatic clamping and loosening of the large-diameter seamless tube. Through the meshing transmission of the active gear, transmission gear, and output gear of the coaxial transmission assembly, the main and secondary expansion heads rotate synchronously in opposite directions. Combined with the staggered meshing structure of their surface spiral edges and grooves, the clamping process is ensured to be stable and reliable. Simultaneously, a reduction gear is installed inside the positioning seat, which can drive the motor base to tilt, thereby achieving flexible adjustment of the overall clamping angle and improving the uniformity and processing quality of the abrasive flow polishing process.

[0010] In a preferred example, the fixture includes a positioning seat, a coaxial drive assembly, a main expansion head, and a secondary expansion head. A motor mount is rotatably mounted on the surface of the positioning seat, and the coaxial drive assembly is fixed to one side of the motor mount. The output end of the motor mount is connected to a main spindle, which passes through the coaxial drive assembly, the main expansion head, and the secondary expansion head, and is slidably connected to the secondary expansion head at its end via a flange joint. A mandrel sleeve is fitted onto the surface of the main spindle, and the conical expansion surface of the mandrel sleeve slides in contact with the wedge surfaces of the main and secondary expansion heads. Thus, when the main spindle drives the mandrel sleeve to move axially, it drives the main and secondary expansion heads to expand or contract radially, achieving automatic clamping and loosening of the seamless tube. This solution avoids the tedious operation of manual tightening or bolt pressing, significantly improving clamping efficiency and convenience.

[0011] In a preferred example, a reduction gear is provided on the inner side of the positioning seat to drive the motor seat to tilt at an angle, thereby causing the coaxial transmission assembly, the main expansion head, and the auxiliary expansion head to deflect as a whole. This structure allows the fixture to flexibly adjust the clamping angle with the seamless tube according to different process requirements, ensuring that the abrasive flow forms a reasonable trajectory on the inner wall of the tube, specifically improving the uniformity and surface quality of polishing.

[0012] In a preferred example, the spindle surface is provided with spline ridges, and the flange joint is slidably fitted onto the spline ridge surface. This structure ensures both the synchronous rotation of the flange joint and the spindle, and allows for axial sliding on the spindle, thereby enabling flexible displacement of the auxiliary expansion head during clamping and loosening, which specifically improves the clamping reliability of the fixture.

[0013] In a preferred example, the first and second spiral edges of the main and auxiliary expansion heads are arranged in an alternating manner and engage with the second and first spiral grooves, respectively. When the main and auxiliary expansion heads rotate in opposite directions under the drive of the coaxial transmission assembly, they can achieve mutually cooperating counter-movements, thereby maintaining stability during clamping and specifically preventing slippage of the seamless tube during polishing.

[0014] In a preferred example, the mandrel sleeve employs a spindle roller structure, and the conical expansion surface of the mandrel sleeve, as well as the wedge surfaces of the main and auxiliary expansion heads, are hardened and machined into smooth surfaces. This structure reduces frictional resistance and improves wear resistance, specifically ensuring the stability of the clamping action and extending its service life.

[0015] In a preferred example, the main expansion head and the auxiliary expansion head are made of elastic low-carbon steel alloy material, and their spiral edges can undergo elastic bending deformation under force, thereby automatically compensating for the difference in the inner diameter of the seamless tube, which can improve the applicability and stability of the clamping.

[0016] In a preferred example, the output tooth and the driving tooth are arranged opposite each other on both sides of the transmission tooth, and synchronous transmission is achieved through the transmission tooth. Both the driving tooth and the output tooth have bearing rings on their surfaces that mate with the transmission housing. This structure improves transmission accuracy and meshing stability, specifically ensuring smooth rotation of the main and auxiliary expansion heads during operation.

[0017] In a preferred example, the inner walls of the first swirl groove of the main expansion head and the second swirl groove of the auxiliary expansion head are both machined into smooth curved surfaces, and the groove width matches the width of the swirl ridge. This structure ensures smooth movement of the swirl ridge within the swirl groove, specifically preventing damage to the inner wall of the seamless tube caused by uneven friction.

[0018] The beneficial effects achieved by this invention are as follows: 1. In this invention, a coaxial transmission assembly drives the main expansion head and the auxiliary expansion head to rotate synchronously in opposite directions. Combined with the sliding fit between the main shaft and the mandrel sleeve, the main expansion head and the auxiliary expansion head can reliably expand or contract, thereby achieving automatic clamping and loosening of large-diameter seamless tubes. Compared with traditional clamping methods that rely on manual tightening or bolt pressing, this structure can significantly improve clamping efficiency and ease of operation.

[0019] 2. In this invention, a staggered meshing structure of spiral ridges and spiral grooves is provided between the main expansion head and the auxiliary expansion head, enabling reliable relative engagement between the main and auxiliary expansion heads during opposite rotation. The main and auxiliary expansion heads are made of elastic low-carbon steel alloy, and their spiral ridges can generate moderate elastic deformation under stress, thus providing automatic compensation for seamless tubes of different inner diameters. This structure not only improves the applicability of the clamp to seamless tubes of different specifications but also enhances the stability and reliability of the clamping process.

[0020] 3. In this invention, a reduction gear is installed inside the positioning seat, enabling the motor seat to tilt at an angle, thereby driving the coaxial transmission assembly, the main expansion head, and the auxiliary expansion head to deflect as a whole. This structure allows for flexible adjustment of the clamping angle between the fixture and the seamless tube according to actual process requirements, enabling the abrasive flow to form a reasonable flow trajectory on the inner wall of the tube, thereby effectively improving the uniformity and processing quality of the polishing process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the main expansion head and auxiliary expansion head engagement and coaxial transmission assembly according to an embodiment of the present invention; Figure 3 This is an exploded view of a coaxial transmission assembly according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the main expansion head and auxiliary expansion head structure according to an embodiment of the present invention; Figure 5 This is an exploded structural diagram of the main expansion head, the auxiliary expansion head, and the core cone sleeve according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the main expansion head and auxiliary expansion head structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the surface structure of the main expansion head according to an embodiment of the present invention.

[0022] Figure label: 100. Positioning seat; 110. Motor base; 120. Main spindle; 121. Flange joint; 130. Core cone sleeve; 131. Conical expansion surface; 200. Coaxial transmission assembly; 210. Transmission box; 220. Drive gear; 230. Output gear; 240. Bearing sleeve; 241. Transmission gear; 300. Main expansion head; 310. First spiral ridge; 320. First spiral groove; 400, secondary expansion head; 410, second spiral ridge; 420, second spiral groove; 411, wedge surface. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0024] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0025] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, a fixture for abrasive flow polishing of large-diameter seamless tubes.

[0026] Combination Figures 1-7 As shown, the present invention provides a fixture for abrasive flow polishing of large-diameter seamless pipes, comprising a positioning seat 100, a coaxial transmission assembly 200, a main expansion head 300, and a secondary expansion head 400. A motor base 110 is rotatably mounted on the surface of the positioning seat 100, and the coaxial transmission assembly 200 is fixedly mounted on one side of the motor base 110. A main shaft 120 is connected to the output end of the motor base 110. One end of the main shaft 120 passes through the coaxial transmission assembly 200, the main expansion head 300, and the secondary expansion head 400, and a flange joint 121 that slidably engages with the end of the secondary expansion head 400 is slidably mounted at its end. A core cone sleeve 130 is rotatably sleeved on the surface of the main shaft 120.

[0027] In this embodiment, the coaxial transmission assembly 200 includes a transmission box 210, a drive gear 220, and an output gear 230. The drive gear 220 is fixed to the surface of the main shaft 120 and rotates synchronously with the main shaft 120. One side of the output gear 230 is fixedly connected to the end of the main expansion head 300. A bearing sleeve 240 is rotatably mounted inside the transmission box 210, and transmission gears 241 are rotatably mounted on both sides of the bearing sleeve 240. The transmission gears 241 are rotatably mounted on the inner wall of the transmission box 210 and mesh with the surfaces of the drive gear 220 and the output gear 230, respectively. With the above structure, when the main shaft 120 rotates under the action of the motor base 110, the drive gear 220 and the output gear 230 are linked through the transmission gears 241, thereby driving the main expansion head 300 to rotate synchronously.

[0028] In this embodiment, the main expansion head 300 and the auxiliary expansion head 400 have the same structure. The surface of the main expansion head 300 is provided with a first spiral ridge 310 and a first spiral groove 320, and the surface of the auxiliary expansion head 400 is provided with a second spiral ridge 410 and a second spiral groove 420. The inner sides of the first spiral ridge 310 and the second spiral ridge 410 are provided with wedge surfaces 411, and the wedge surfaces 411 slide against the conical expansion surface 131 of the core cone sleeve 130. The core cone sleeve 130 is sleeved on the surface of the main shaft 120. When the core cone sleeve 130 slides axially under the drive of the main shaft 120, the conical expansion surface 131 generates a force along the wedge surface 411, forcing the first spiral ridge 310 and the second spiral ridge 410 to expand radially, thereby reliably contacting the inner wall of the seamless tube to achieve clamping.

[0029] In this embodiment, a speed reduction servo is provided on the inner side of the positioning seat 100. The speed reduction servo is connected to the motor seat 110 and is used to drive the motor seat 110 to tilt at an angle, thereby driving the coaxial transmission assembly 200, the main expansion head 300 and the auxiliary expansion head 400 to tilt and deflect as a whole, so as to adjust the clamping angle between the fixture and the seamless tube and adapt to the abrasive flow polishing requirements at different angles.

[0030] In this embodiment, the surface of the spindle 120 is provided with spline ridges, and the flange joint 121 is slidably sleeved on the spline ridge surface of the spindle 120. This structure can ensure that the flange joint 121 and the spindle 120 rotate synchronously, and also allow the flange joint 121 to slide along the axial direction of the spindle 120, thereby achieving axial adjustment during clamping or loosening.

[0031] In this embodiment, the first spiral ridge 310 and the second spiral ridge 410 of the main expansion head 300 and the auxiliary expansion head 400 are arranged in an alternating manner. The first spiral ridge 310 meshes with the second spiral groove 420, and the second spiral ridge 410 meshes with the first spiral groove 320. When the main expansion head 300 and the auxiliary expansion head 400 are driven to rotate by the output tooth 230 and the flange joint 121 respectively, they will rotate in opposite directions, realizing a clamping action that cooperates with each other.

[0032] In this embodiment, the core cone sleeve 130 is a spindle roller structure. The surface of the conical expansion surface 131 of the core cone sleeve 130 and the surface of the wedge surface 411 of the main expansion head 300 and the auxiliary expansion head 400 are all hardened and processed into a smooth surface to improve wear resistance and service life.

[0033] In this embodiment, both the main expansion head 300 and the auxiliary expansion head 400 are made of elastic low-carbon steel alloy material. The first spiral rib 310 and the second spiral rib 410 can undergo elastic bending deformation under force, thereby enhancing the adaptability of the clamp to seamless tubes of different sizes and ensuring clamping stability.

[0034] In this embodiment, the output tooth 230 and the driving tooth 220 are arranged opposite each other on both sides of the transmission tooth 241, and synchronous transmission is achieved through the transmission tooth 241. The surfaces of both the driving tooth 220 and the output tooth 230 are provided with bearing rings that mate with the surface of the transmission box 210 to improve the stability and durability of the gear transmission.

[0035] In this embodiment, the inner walls of the first swirl groove 320 of the main expansion head 300 and the second swirl groove 420 of the auxiliary expansion head 400 are both machined into smooth curved surfaces, and the widths of the first swirl groove 320 and the second swirl groove 420 match the widths of the first swirl ridge 310 and the second swirl ridge 410. This structure ensures that the first swirl ridge 310 and the second swirl ridge 410 slide smoothly within the swirl grooves, avoiding damage to the inner wall of the seamless tube.

[0036] Working principle and usage process of this invention: The fixture for abrasive flow polishing of large-diameter seamless tubes provided by the present invention achieves highly stable clamping of large-diameter seamless tubes and adaptive adjustment during the abrasive flow polishing process through the coordinated work of positioning seat 100, coaxial transmission assembly 200, main expansion head 300 and auxiliary expansion head 400.

[0037] During use, the positioning seat 100 ensures the stability of the overall fixture through fixed installation. A motor seat 110 is rotatably mounted on its surface, and the output end of the motor seat 110 drives the main spindle 120 to rotate. One end of the main spindle 120 passes through the coaxial transmission assembly 200, the main expansion head 300, and the auxiliary expansion head 400, and slides with the end of the auxiliary expansion head 400 through a flange joint 121, thus enabling the main spindle 120 to drive the auxiliary expansion head 400 when it rotates. A seamless tube is sleeved on the surfaces of the main expansion head 300 and the auxiliary expansion head 400.

[0038] The main spindle 120 has splined edges on its surface, and the flange joint 121 is fitted onto the splined edges, thereby allowing the flange joint 121 to slide axially on the main spindle 120 while maintaining synchronous rotation. A mandrel sleeve 130 is fitted over the main spindle 120. The mandrel sleeve 130 has a tapered expansion surface 131 on its surface, which slides in contact with the wedge surfaces 411 of the main expansion head 300 and the auxiliary expansion head 400. When the mandrel sleeve 130 moves axially on the main spindle 120, the wedge surfaces 411 of the main expansion head 300 and the auxiliary expansion head 400 slide along the tapered expansion surface 131, forcing the first spiral ridge 310 and the second spiral ridge 410 to expand outwards and contact the inner wall of the seamless tube, thereby achieving reliable clamping of the seamless tube.

[0039] A coaxial transmission assembly 200 is mounted on one side of the motor base 110 and includes a transmission box 210, a drive gear 220, an output gear 230, a bearing sleeve 240, and a transmission gear 241. The drive gear 220 is fixed to the surface of the main shaft 120 and rotates synchronously with it. The transmission gear 241 is rotatably mounted on the inner wall of the transmission box 210 via the bearing sleeve 240, meshing with both the drive gear 220 and the output gear 230. One side of the output gear 230 is fixedly connected to the main expansion head 300, so that when the main shaft 120 rotates, the drive gear 220 and the output gear 230 are linked through the transmission gear 241, enabling the main expansion head 300 to rotate synchronously. The auxiliary expansion head 400 is connected to the main shaft 120 via a flange joint 121 and participates synchronously in the clamping action; that is, the main expansion head 300 and the auxiliary expansion head 400 rotate synchronously, but in opposite directions.

[0040] The main expansion head 300 and the auxiliary expansion head 400 have the same structure, each equipped with a first spiral ridge 310, a first spiral groove 320, a second spiral ridge 410, and a second spiral groove 420. The first spiral ridge 310 engages with the second spiral groove 420, and the second spiral ridge 410 engages with the first spiral groove 320, thus achieving mutual cooperation and relative movement when the main and auxiliary expansion heads rotate in opposite directions. The inner walls of the spiral grooves 320 and 420 are smooth curved surfaces, and their widths are adapted to the spiral ridges 310 and 410, ensuring smooth movement during expansion and contraction and preventing damage to the outer wall of the seamless tube.

[0041] During the clamping process, when the motor base 110 rotates the main shaft 120 and pushes the core cone sleeve 130 to move axially, the conical expansion surface 131 acts on the first spiral ridge 310 and the second spiral ridge 410 of the main and auxiliary expansion heads along the wedge surface 411, forcing them to expand radially outward, thereby enabling the main expansion head 300 and the auxiliary expansion head 400 to reliably clamp the outer wall of the seamless tube. Since the first spiral ridge 310 and the second spiral ridge 410 of the main expansion head 300 and the auxiliary expansion head 400 are arranged in an alternating manner and can undergo elastic deformation bending under force, they can form a stable clamping for seamless tubes of different sizes, improving clamping adaptability.

[0042] In addition, the reduction gear installed in the positioning seat 100 can drive the motor seat 110 to tilt, thereby driving the coaxial transmission assembly 200, the main expansion head 300 and the auxiliary expansion head 400 to tilt and deflect as a whole, adjusting the installation angle of the fixture and the seamless tube to adapt to different pipe posture requirements during abrasive flow polishing.

[0043] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A fixture for abrasive flow polishing of large-diameter seamless pipes, characterized in that, The device includes a positioning seat (100), a coaxial transmission assembly (200), a main expansion head (300), and a secondary expansion head (400). A motor seat (110) is rotatably mounted on the surface of the positioning seat (100). The coaxial transmission assembly (200) is fixedly mounted on one side of the motor seat (110). The output end of the motor seat (110) is connected to a main shaft (120). One end of the main shaft (120) passes through the coaxial transmission assembly (200), the main expansion head (300), and the secondary expansion head (400) and is slidably mounted with a flange joint (121) that engages with the end of the secondary expansion head (400). A core cone sleeve (130) is rotatably sleeved on the surface of the main shaft (120). The main expansion head (300) and the auxiliary expansion head (400) have the same structure. Their surfaces are respectively provided with a first spiral ridge (310) and a second spiral ridge (410). The surfaces of the main expansion head (300) and the auxiliary expansion head (400) are respectively provided with a first spiral groove (320) and a second spiral groove (420). The inner sides of the first spiral ridge (310) and the second spiral ridge (410) are provided with a wedge surface (411) that slides against the surface of the core cone sleeve (130). The surface of the core cone sleeve (130) is provided with a conical expansion surface (131) that slides against the surface of the wedge surface (411).

2. The fixture for abrasive flow polishing of large-diameter seamless tubes according to claim 1, characterized in that, The inner side of the positioning seat (100) is provided with a speed reduction servo for driving the motor seat (110) to tilt, thereby driving the coaxial transmission assembly (200), the main expansion head (300) and the auxiliary expansion head (400) to tilt and deflect as a whole, thereby adjusting the tilt angle of the seamless tube.

3. The fixture for abrasive flow polishing of large-diameter seamless tubes according to claim 1, characterized in that, The surface of the main shaft (120) is provided with spline ridges, and the flange joint (121) is slidably sleeved on the spline ridge surface of the main shaft (120) to guide the flange joint (121) to slide axially on the surface of the main shaft (120) and maintain synchronous rotation.

4. The fixture for abrasive flow polishing of large-diameter seamless tubes according to claim 1, characterized in that, The coaxial transmission assembly (200) includes a transmission box (210), a drive gear (220), and an output gear (230). The drive gear (220) is fixed to the surface of the main shaft (120) and rotates synchronously with the main shaft (120). One side of the output gear (230) is fixedly connected to the end of the main expansion head (300). A bearing sleeve (240) is rotatably installed inside the transmission box (210). Transmission gears (241) are rotatably installed on both sides of the bearing sleeve (240). The transmission gears (241) are rotatably installed on the inner wall of the transmission box (210) and mesh with the surfaces of the drive gear (220) and the output gear (230) respectively.

5. The fixture for abrasive flow polishing of large-diameter seamless tubes according to claim 1, characterized in that, The first spiral ridge (310) and the second spiral ridge (410) are arranged in an alternating manner, the first spiral ridge (310) meshes with the second spiral groove (420), and the second spiral ridge (410) meshes with the first spiral groove (320).

6. A fixture for abrasive flow polishing of large-diameter seamless tubes according to claim 1, characterized in that, The core cone sleeve (130) is a spindle roller structure, and the surface of the conical expansion surface (131) and the wedge surface (411) of the first spiral ridge (310) and the second spiral ridge (410) are all hardened.

7. A fixture for abrasive flow polishing of large-diameter seamless tubes according to claim 1, characterized in that, The main expansion head (300) and the secondary expansion head (400) are both made of elastic low-carbon steel alloy. The first spiral ridge (310) and the second spiral ridge (410) can deform and bend under force.

8. A fixture for abrasive flow polishing of large-diameter seamless tubes according to claim 1, characterized in that, The output tooth (230) and the active tooth (220) are arranged opposite to each other on both sides of the transmission tooth (241) and synchronous transmission is achieved through the transmission tooth (241). The surfaces of the active tooth (220) and the output tooth (230) are provided with bearing rings that cooperate with the surface of the transmission box (210).

9. A fixture for abrasive flow polishing of large-diameter seamless tubes according to claim 1, characterized in that, The inner sides of the first swirl groove (320) of the main expansion head (300) and the second swirl groove (420) of the auxiliary expansion head (400) are both smooth curved surfaces, and the widths of the first swirl groove (320) and the second swirl groove (420) are adapted to the widths of the first swirl ridge (310) and the second swirl ridge (410).

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