Clamp for thin-wall workpiece

Abstract

The invention provides a clamp for a thin-wall workpiece, and belongs to the technical field of machinery. The problem that an existing thin-wall workpiece is low in centering and clamping efficiency is solved. The clamp for the thin-wall workpieces comprises a disc-shaped shell, a rod-shaped pull rod and a plurality of pressing pieces arranged at the front end of the shell, and further comprises an elastic piece, a rod-shaped linkage piece and a plurality of blocky centering pieces, the linkage piece is arranged in the shell in a penetrating mode along the axis of the shell, and the linkage piece and the pull rod are coaxially arranged; the elastic piece is cylindrical and is arranged on the outer side of the linkage piece in a sleeving mode, one end of the elastic piece abuts against the inner side of the front end of the shell, the other end of the elastic piece abuts against the rear end of the linkage piece, and when the pull rod moves forwards in the axial direction, the linkage piece can be pushed to overcome the elastic force of the elastic piece to move forwards. The centering pieces are arranged at the front end of the shell in a sliding mode in the radial direction of the shell, and a linkage structure is arranged between the front end of the linkage piece and the centering pieces. The clamp for the thin-wall workpieces has the advantage of being high in clamping efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical technology, and relates to a fixture, in particular to a fixture for thin-walled workpieces. Background Art

[0002] Thin-walled workpieces generally refer to workpieces with a circular ring shape and a small wall thickness. Before processing such workpieces, a chuck is required to clamp and fix the workpieces. In order to avoid radial deformation of the thin-walled workpieces during the clamping process, an end clamping method is often used to clamp and fix the workpieces. Before the chuck clamps the workpiece, it is necessary to center the thin-walled workpiece to ensure the accuracy and stability of the subsequent processing process.

[0003] For example, people have designed a self-centering fixture for thin-walled parts and applied for a Chinese patent. Its application number is: 201220263922.8; its publication number is: CN202607310U; this self-centering fixture for thin-walled parts includes a fixture body and a positioning shaft. The fixture body is fixedly connected to the positioning shaft. A disc spring and a retaining ring are sleeved on the positioning shaft. And a positioning sleeve is slidably arranged at the non-connected end of the fixture body, and a threaded hole is opened. A screw passes through a pressing plate close to the positioning sleeve and is screwed into the positioning shaft. When this self-centering fixture for thin-walled parts works, the screw can be tightened, thereby pushing the pressing plate. The pressing plate pushes the positioning sleeve to axially slide on the positioning shaft, so that the disc spring is compressed, and the disc spring radially expands, thereby clamping the workpiece.

[0004] However, this self-centering fixture for thin-walled parts has deficiencies in actual use: ① In the prior art, workpieces are generally clamped by a chuck driven by a hydraulic cylinder, and the hydraulic cylinder is located at the rear end of the chuck, that is, far from the workpiece clamping end. The operation of the above-mentioned self-centering fixture for thin-walled parts requires tightening the screw, and the screw is located at the front end of the entire self-centering fixture, that is, the workpiece clamping end. Obviously, the rotation of the screw cannot be directly driven by the hydraulic cylinder, and it is necessary to additionally add a driving structure such as a robotic arm or tighten the screw manually to center the workpiece. For the former, the workpiece clamping process includes the robotic arm rotating the screw to center, the chuck clamping the workpiece, and the robotic arm leaving the workpiece clamping end. Compared with the existing workpiece clamping process, the process is increased and the workpiece clamping efficiency is reduced. And for the latter, it will further reduce the workpiece clamping efficiency, thereby affecting the processing efficiency; ② This self-centering fixture for thin-walled parts uses a disc spring to perform self-centering of the workpiece. Because the disc spring itself can undergo elastic deformation, it is difficult to ensure the centering accuracy of the workpiece; ③ The disc spring needs to achieve axial elastic deformation and reset after deformation, and also needs to apply a radial force to tighten the workpiece, which has a greater impact on the service life of the disc spring. Summary of the Invention

[0005] The purpose of the present invention is to address the above problems existing in the prior art, and propose a fixture for thin-walled workpieces, which solves the problem of low centering and clamping efficiency of existing thin-walled workpieces.

[0006] The object of the present invention can be achieved by the following technical solutions: A fixture for thin-walled workpieces, comprising a disk-shaped housing, a rod-shaped pull rod, and several pressing members arranged at the front end of the housing. The rear end of the pull rod passes through the housing, and when the pull rod moves axially backward, it can drive several of the above-mentioned pressing members to move axially backward to press the workpiece. It is characterized in that the fixture further comprises an elastic member, a rod-shaped linkage member, and several block-shaped centering members. The linkage member is axially disposed in the housing along the axis of the housing and is coaxially arranged with the pull rod. The elastic member is tubular and sleeved outside the linkage member. One end of the elastic member abuts against the inner side of the front end of the housing, and the other end abuts against the rear end of the linkage member. When the pull rod moves axially forward, it can push the linkage member to move forward against the elastic force of the elastic member. Several of the centering members are slidably arranged along the radial direction of the housing at the front end of the housing. There is a linkage structure between the front end of the linkage member and several of the centering members. When the linkage member moves axially backward, it can drive several of the centering members to approach each other radially along the housing through the linkage structure.

[0007] The fixture for thin-walled workpieces is a composite fixture for clamping thin-walled workpieces in a circular ring shape, comprising an end pressing part for pressing the end of the workpiece and a centering part for centering the workpiece. After the circular ring-shaped workpiece is clamped and fixed by the fixture for thin-walled workpieces, it can be used for the machine tool cutter to turn the inner wall of the fixed workpiece. Among them, the end pressing part is a conventional structure. The pressing member arranged at the eccentric position at the front end of the housing is generally L-shaped, including a pull column arranged along the axial direction of the housing and a positioning finger vertically connected to the end of the pull column away from the housing. When the pressing member moves axially forward, the positioning finger can rotate around the axis of the pull column to deviate from the center position of the housing to make way for the loading and unloading of the workpiece. On the contrary, when the pressing member moves axially backward, the positioning finger rotates to face the direction of the center of the housing to facilitate pressing the end face of the workpiece away from the housing.

[0008] When the fixture for thin-walled workpieces is installed, the rear end of the pull rod is fixed to the piston rod of the hydraulic cylinder arranged behind the housing, and the hydraulic cylinder drives the pull rod to move axially to drive the pressing member to move axially, so as to press the workpiece or loosen the workpiece. At the same time, the centering part realizes the centering function.

[0009] When the hydraulic cylinder drives the pull rod to move forward, it can push the linkage to move forward axially against the elastic force of the elastic member. Driven by the linkage structure, several centering members move away from each other along the radial direction of the housing, leaving the central position open. On the contrary, when the hydraulic cylinder drives the pull rod to move backward, the linkage moves backward under the elastic force of the elastic member. Driven by the linkage, several centering members move closer to each other synchronously and abut against the outer side surface of the workpiece to achieve centering of the workpiece. That is to say, when the hydraulic cylinder drives the pull rod to move forward, the pressing member releases the workpiece, and the centering members move away from each other and also release the workpiece. On the contrary, when the hydraulic cylinder drives the pull rod to move backward, the centering members move closer to each other to achieve centering of the workpiece. At the same time, the pressing member presses tightly against the end of the workpiece to achieve clamping of the workpiece.

[0010] In the fixture for this thin-walled workpiece, the centering part and the end pressing part are integrated into the same housing, making the structure more compact and reducing the overall volume of the fixture. The same pull rod is used to drive both parts, achieving dual use of one component. Compared with the existing chuck for clamping workpieces, no additional processes are added, and the clamping time of the workpiece is not increased, improving the efficiency of workpiece centering and clamping. In addition, in the centering part of the fixture for this thin-walled workpiece, the elastic force of the elastic member is used as the power for several centering members to center the workpiece towards each other. It is not easy for the workpiece to be deformed by a large force during centering, reducing the rejection rate.

[0011] In the fixture for a thin-walled workpiece described above, a ring-shaped nut is threadedly connected to the outer side of the rear end of the linkage. The elastic member is a spring, and the two ends of the spring respectively abut against the nut and the inner wall of the front end of the housing. The elastic force of the spring can be adjusted by the nut threadedly connected to the linkage, and then the radial centering force applied to the workpiece can be adjusted to facilitate selection according to different workpieces or different centering requirements. In addition, when the spring has been used for a long time, the spring can also be made to maintain the elastic force applied to the linkage by screwing the nut in.

[0012] In the fixture for a thin-walled workpiece described above, on the side of several centering members facing the center of the housing, there is a concave arc-shaped centering surface, and several centering surfaces are located on the same cylindrical surface. On the side of the centering member facing the axis of the housing, there is a concave centering surface, which is used to abut against the outer side surface of the ring-shaped workpiece, providing a better support and positioning effect. Even if the position of the workpiece is offset, the position of the workpiece can be corrected, making the centering efficiency and clamping efficiency higher. And several centering surfaces being located on the same cylindrical surface can further improve the concentricity of the workpiece after centering and improve the accuracy of clamping and positioning.

[0013] In the above-mentioned fixture for thin-walled workpieces, several recessed chutes are radially formed on the front end face of the housing. Each of the centering members includes a slider slidably disposed in the chute and a centering block detachably connected to the front side of the slider, and the centering surface is located on the centering block. The cooperation between the chute and the slider can not only provide radial sliding guidance for the centering member, but also limit the centering member axially, thereby providing stable guidance for the axial movement of the linkage member. In addition, the detachably connected centering block can be replaced with a suitable centering block according to the different workpieces to be processed as required, and has a wide range of applications.

[0014] In the above-mentioned fixture for thin-walled workpieces, on one side of each of the centering blocks facing the center of the housing, there is a protruding block-shaped centering portion. The axial length of the centering portion on the housing axis is less than the maximum axial length of the centering block on the housing axis, and the centering portion is disposed close to the front end face of the housing, and the centering surface is located on the centering portion. The smaller axial length of the centering portion and its arrangement close to the front end face of the housing leave a certain gap at the front side of the centering block, which can leave a small offset space for the workpiece during centering, and then correct the angle of the workpiece again when the end pressing part presses the workpiece, avoiding the situation of poor centering accuracy of the workpiece caused by jamming the workpiece during centering.

[0015] In the above-mentioned fixture for thin-walled workpieces, the linkage structure includes several recessed long strip-shaped guide grooves formed on the outer side of the front end of the linkage member and guide portions located on the centering members. The several guide grooves are inclined with respect to the axis of the housing, and the distance between the several guide grooves gradually decreases from back to front. The number of the guide portions is the same as the number of the guide grooves, and the several guide portions are respectively snapped into the several guide grooves. The inclined guide grooves are used to drive the guide portions and the centering members to move, with better synchronism and more stable transmission.

[0016] In the above-mentioned fixture for thin-walled workpieces, the linkage member includes a rod-shaped rod portion and a head located at the front end of the rod portion. The radial width of the head is greater than the diameter of the rod portion. The several guide grooves are evenly distributed around the axis of the linkage member on the outer side of the head, and the several guide grooves are all T-shaped grooves, and the cross-sectional shape of the guide portion is T-shaped. Both the guide groove and the guide portion are T-shaped, and there is a clearance fit between them to facilitate better guiding of the centering member; and the linkage member is designed with a head and a rod portion with a smaller diameter, which can reduce the volume of the linkage member and facilitate integration. At the same time, the rod portion with a smaller diameter and the head provided with the guide groove can reduce the weight of the linkage member, which is not only convenient for the elastic member to reset, but also can use the cooperation between the guide groove and the guide portion, and the centering member slidably disposed radially to guide the axial movement of the linkage member, ensuring the stability of the axial movement of the linkage member, and further ensuring the stability of the drive of the linkage member and the centering accuracy.

[0017] As another case, in the above-mentioned fixture for thin-walled workpieces, the linkage structure includes the same number of racks 1, gears and racks 2, the racks 1 are all arranged along the axial direction of the shell and fixed on the linkage member, the racks 2 are arranged along the radial direction of the shell and fixed on several centering members one by one, the gears are rotatably connected in the shell, and the racks 1 and 2 are meshed with the gears at the same time. The number of racks 1, gears, racks 2 and centering members can all be three, and the three racks 1 are distributed circumferentially on the outside of the linkage member, and the three racks 1 are respectively connected to the three racks 2 through three gears to achieve transmission connection, so as to realize the axial movement of the linkage member to drive the radial movement of the three centering members.

[0018] Compared with the prior art, the fixture for thin-walled workpieces has the following advantages: 1. Make full use of the position of the center of the shell and the position of the front end surface, and integrate the centering part and the end pressure part into the same shell, making the structure more compact and reducing the overall volume of the fixture.

[0019] 2. The two parts are driven by the same pull rod. Compared with the existing chuck for clamping the workpiece, no additional driving structure is added, which reduces the cost and reduces the volume. There is no need to add additional processes, which will not increase the workpiece clamping time and improve the workpiece centering and clamping efficiency.

[0020] 3. In the centering part of the fixture for thin-walled workpieces, the elastic force of the elastic member is used as the power for several centering members to center the workpiece, which makes it difficult for the workpiece to be deformed due to a large force when centering, thereby reducing the scrap rate.

[0021] 4. An integrated centering block structure is used to center the workpiece, which has a stable centering effect and ensures the centering accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the first embodiment of the clamp for thin-walled workpieces.

[0023] Figure 2 It is a schematic cross-sectional structure diagram of the first embodiment of the clamp for thin-walled workpieces.

[0024] Figure 3 It is a structural schematic diagram of the cooperation between the linkage member and one of the centering members in the first embodiment of the clamp for thin-walled workpieces.

[0025] Figure 4 It is a schematic cross-sectional structural diagram of the cooperation between the linkage member and the centering member when the linkage member moves backward in the first embodiment of the clamp for thin-walled workpieces.

[0026] Figure 5It is a schematic cross-sectional structure diagram of the cooperation between the linkage and the centering member when the linkage moves forward in the first embodiment of the fixture for this thin-walled workpiece.

[0027] Figure 6 It is a schematic structural diagram of the fixture for this thin-walled workpiece when clamping the workpiece.

[0028] In the figure, 1 is the housing; 11 is the chute; 2 is the pull rod; 3 is the pressing member; 31 is the pull column; 32 is the positioning finger; 4 is the elastic member; 5 is the linkage; 51 is the guide groove; 52 is the rod part; 53 is the head; 6 is the centering member; 61 is the guide part; 62 is the slider; 63 is the centering block; 64 is the centering part; 65 is the centering surface; 7 is the nut; 8 is the workpiece; 9 is the pull seat. Specific embodiments

[0029] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments. Embodiment 1

[0030] As Figure 1As shown in the figure, the fixture for this thin-walled workpiece includes a disc-shaped housing 1, a round rod-shaped pull rod 2, and three pressing members 3 arranged at the front end of the housing 1. The pull rod 2 is inserted into the housing 1 along the axis of the housing 1, and the rear end of the pull rod 2 passes through the rear side of the housing 1. The three pressing members 3 are arranged at an eccentric position at the front end of the housing 1 and are evenly distributed around the axis of the housing 1. The front end of the housing 1 is also connected with several cylindrical pull seats 9. The pressing member 3 is generally L-shaped, including a round rod-shaped pull column 31 arranged along the axis of the housing 1 and a positioning finger 32 vertically connected to the end of the pull column 31 away from the housing 1. The rear ends of several pull columns 31 pass through several pull seats 9 one by one. When the pull rod 2 moves axially, it can drive the pressing member 3 to move. When the pull rod 2 moves forward axially to drive the pressing member 3 to move forward axially, the positioning finger 32 can rotate around the axis of the pull column 31 to deviate from the center position of the housing 1 to make way for the loading and unloading of the workpiece 8. On the contrary, when the pressing member 3 moves backward axially driven by the pull rod 2, the positioning finger 32 rotates to the direction towards the center of the housing 1 to facilitate pressing against the end face of the workpiece 8 at the end away from the housing 1. This part of the structure is the end pressing part, which is the prior art and is used to press the positioning finger 32 against the end face of the workpiece 8 at the end away from the housing 1 and apply an axial force towards the housing 1 direction to clamp the thin-walled workpiece 8 in an end pressing manner. For the specific structure of the end pressing part, reference can be made to the utility model patent with the application number 202422098995.1 and the patent name of an adjustable finger chuck. In this utility model patent, it also includes a cylindrical pull column, a cylindrical pull seat, and a positioning finger with a positioning part. Among them, the side parts of the pull column all have long strip-shaped guide grooves, and pins are fixed on the side parts of the pull seat, and one end of the pin correspondingly extends into the guide groove. When driving the pull column to move backward, the pin can move along the guide groove and make the pull column rotate circumferentially relative to the pull seat and make the positioning part rotate with the pull column to the position towards the center. Here, the guide groove includes a turning groove and a guiding groove that are both long strip-shaped. The turning groove is inclined relative to the axis of the pull column. The length direction of the guiding groove is consistent with the axial direction of the pull column. The guiding groove is located in front of the turning groove, and the rear end of the guiding groove is connected to one end of the turning groove, and the connection part is arc-shaped.

[0031] At the center of the front end of the housing 1, there is a boss protruding forward in a cylindrical shape. On the front end face of the boss, three recessed sliding grooves 11 are radially provided. The three sliding grooves 11 are evenly distributed around the axis of the boss. A block-shaped centering member 6 is slidably arranged at the three sliding grooves 11. In this embodiment, the sliding groove 11 is a T-shaped groove. The structures of several centering members 6 are the same, and each includes a slider 62 with a T-shaped cross-section slidably arranged in the sliding groove 11 and a centering block 63 detachably connected to the front side of the slider 62 through a fastening screw. On the side of several centering blocks 63 facing the center of the housing 1, there is a protruding block-shaped centering portion 64. The length of the centering portion 64 in the axial direction of the housing 1 is less than the maximum length of the centering block 63 in the axial direction of the housing 1, and the centering portion 64 is arranged close to the front end face of the housing 1. On the side of the centering portion 64 facing the axis of the housing 1, there is a recessed arc-shaped centering surface 65, and the centering surfaces 65 of the three centering portions 64 are located on the same cylindrical surface.

[0032] As Figure 2 shown, the fixture further includes an elastic member 4 and a link member 5 in the shape of a round rod. The link member 5 is axially disposed in the housing 1 along the axis of the housing 1 and is coaxially arranged with the pull rod 2. The link member 5 can move backward under the elastic force of the elastic member 4 and abut against the front end of the pull rod 2. On the outer side of the front end of the link member 5, there are three recessed long strip-shaped guide grooves 51. The three guide grooves 51 are inclined with respect to the axis of the housing 1, and the distance between the three guide grooves 51 gradually decreases from back to front. Each of the three centering members 6 has a guide portion 61 that is correspondingly engaged in the several guide grooves 51.

[0033] As Figure 3 shown, the link member 5 includes a rod portion 52 in the shape of a round rod and a head portion 53 located at the front end of the rod portion 52. The radial width of the head portion 53 is greater than the diameter of the rod portion 52. The three guide grooves 51 are evenly distributed around the axis of the link member 5 on the outer side of the head portion 53, and the three guide grooves 51 are all T-shaped grooves. The guide portion 61 is integrally connected with the slider 62. The cross-sectional shape of the guide portion 61 is T-shaped, and its size matches that of the guide groove 51 to achieve a clearance fit between the two. In this embodiment, a circular nut 7 is threadedly connected to the outer side of the rear end of the rod portion 52 of the link member 5. The elastic member 4 is a spring and is sleeved on the outer side of the rod portion 52. The two ends of the spring respectively abut against the inner wall of the front end of the housing 1 and the nut 7.

[0034] When installing the fixture for this thin-walled workpiece, the rear end of the pull rod 2 is fixed to the piston rod of the hydraulic cylinder arranged behind the housing 1. The hydraulic cylinder drives the pull rod 2 to axially move to drive the pressing member 3 to axially move, so as to press the annular workpiece 8 or loosen the workpiece 8. At the same time, the centering portion 64 also plays a centering role.

[0035] As Figure 5As shown in the figure, when the hydraulic cylinder drives the pull rod 2 to move forward, it can push the linkage 5 to move forward axially against the elastic force of the elastic member 4. During the movement of the linkage 5, the guiding portions 61 of several centering members 6 can only move radially due to the axial limitation of the sliding groove 11, and then slide along the guiding groove 51 to the end with a larger distance between several guiding grooves 51, so as to realize the situation that several centering members 6 move away from each other along the radial direction of the housing 1 and make way for the central position.

[0036] After placing the annular workpiece 8 into the central position vacated by several centering members 6, as Figure 4 shown in the figure, when the hydraulic cylinder drives the pull rod 2 to move backward, the linkage 5 moves backward under the elastic force of the elastic member 4, and several centering members 6 approach each other and abut against the outer side surface of the annular workpiece 8 to realize centering of the workpiece 8, that is, to ensure the coaxiality of the workpiece 8 and the housing 1, so as to ensure the accuracy and concentricity during the machining of the inner wall of the workpiece 8 after it is fixed.

[0037] That is to say, when the hydraulic cylinder drives the pull rod 2 to move forward, the pressing member 3 releases the workpiece 8, and the centering members 6 move away from each other and also release the workpiece 8. On the contrary, when the hydraulic cylinder drives the pull rod 2 to move backward, the centering members 6 approach each other to realize centering of the workpiece 8. At the same time, the pressing member 3 tightly presses the end of the workpiece 8 to realize clamping of the workpiece 8. After clamping and fixing the workpiece 8, it is used for the machine tool cutter to machine the inner wall of the workpiece 8. Here, in order to ensure centering first and then pressing and clamping, the stroke of the centering members 6 approaching each other to center can be made smaller than the stroke of the pressing member 3 pressing the workpiece 8. Finally, when the pull rod 2 moves backward a certain distance, the rear end of the linkage 5 is separated from the front end of the pull rod 2 and the gap gradually increases, that is, centering is realized first and then pressing. Embodiment 2

[0038] The technical solution of this embodiment is generally the same as that of Embodiment 1, except that: the linkage structure between the linkage and the three centering members includes the same number of first racks, gears and second racks, all of which are three. The three first racks are all arranged along the axial direction of the housing and fixed on the linkage. The three second racks are arranged along the radial direction of the housing and are respectively fixed at the bottoms of the three centering members. The three gears are rotatably connected in the housing, and the three first racks and the second racks are simultaneously engaged with the three gears one by one; in addition, the elastic member 4 can be a cylindrical structure with elastic restoring force. For example, a cylinder made of rubber material is sleeved outside the linkage 5, and the two ends respectively abut against the inner wall of the front end of the housing 1 and the nut 7.

[0039] The specific embodiments described herein are only illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A fixture for thin-walled workpieces, comprising a disc-shaped housing (1), a rod-shaped pull rod (2), and several pressing members (3) arranged at the front end of the housing (1). The rear end of the pull rod (2) passes through the housing (1), and when the pull rod (2) axially moves backward, it can drive several of the above-mentioned pressing members (3) to axially move backward to press the workpiece, characterized in that, The fixture further includes an elastic member (4), a rod-shaped linkage member (5), and several block-shaped centering members (6). The linkage member (5) is axially disposed through the housing (1) along the axis of the housing (1) and is coaxially arranged with the pull rod (2). The elastic member (4) is cylindrical and sleeved outside the linkage member (5). One end of the elastic member (4) abuts against the inner side of the front end of the housing (1), and the other end abuts against the rear end of the linkage member (5). When the pull rod (2) moves forward axially, it can push the linkage member (5) to move forward against the elastic force of the elastic member (4). The several centering members (6) are slidably arranged in the radial direction of the housing (1) at the front end of the housing (1). There is a linkage structure between the front end of the linkage member (5) and the several centering members (6). When the linkage member (5) moves backward axially, it can drive the several centering members (6) to approach each other radially along the housing (1) through the linkage structure.

2. The fixture for a thin-walled workpiece according to claim 1, wherein A ring-shaped nut (7) is threadedly connected to the outer side of the rear end of the rod portion (52) of the linkage member (5). The elastic member (4) is a spring and is sleeved outside the rod portion (52). The two ends of the spring respectively abut against the head (53) and the nut (7).

3. The fixture for a thin-walled workpiece according to claim 1 or 2, characterized in that One side of each of the several centering members (6) facing the center of the housing (1) has a concavely formed arc-shaped centering surface (65), and the several centering surfaces (65) are located on the same cylindrical surface.

4. The fixture for a thin-walled workpiece according to claim 3, characterized in that, Several recessed chutes (11) are radially formed on the front end surface of the housing (1). Each of the several centering members (6) includes a slider (62) slidably arranged in the chute (11) and a centering block (63) detachably connected to the front side of the slider (62). The centering surface (65) is located on the centering block (63).

5. A fixture for thin-walled workpieces according to claim 4, characterized in that, One side of each of the several centering blocks (63) facing the center of the housing (1) has a protruding block-shaped centering portion (64). The length of the centering portion (64) in the axial direction of the housing (1) is less than the maximum length of the centering block (63) in the axial direction of the housing (1), and the centering portion (64) is arranged close to the front end surface of the housing (1). The centering surface (65) is located on the centering portion (64).

6. The fixture for a thin-walled workpiece according to claim 1 or 2, characterized in that, The linkage structure includes several recessed long strip-shaped guide grooves (51) formed on the outer side of the front end of the linkage member (5) and guide portions (61) located on the several centering members (6). The several guide grooves (51) are inclined with respect to the axis of the housing (1), and the distance between the several guide grooves (51) gradually decreases from the rear to the front. The number of the guide portions (61) is the same as the number of the guide grooves (51), and the several guide portions (61) are respectively and correspondingly engaged in the several guide grooves (51).

7. The fixture for a thin-walled workpiece according to claim 6, characterized in that, The linkage member (5) includes a rod portion (52) in the shape of a round rod and a head (53) located at the front end of the rod portion (52). The radial width of the head (53) is greater than the diameter of the rod portion (52). The several guide grooves (51) are evenly distributed around the axis of the linkage member (5) on the outer side of the head (53), and the several guide grooves (51) are all T-shaped grooves. The cross-sectional shape of the guide portion (61) is T-shaped.

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