Universal type auxiliary clamp for turning thin-wall cylindrical workpiece

Abstract

The utility model discloses a universal auxiliary clamp for turning a thin-wall cylindrical workpiece. A pushing body is arranged in a base body; the radial supporting and distance adjusting assemblies are arranged on the base body, the radial supporting and distance adjusting assemblies are in contact fit with the pushing body, and the three sets of radial supporting and distance adjusting assemblies are evenly distributed in the circumferential direction of the base body; the workpiece clamping assemblies are arranged on the radial supporting and distance adjusting assemblies, and each radial supporting and distance adjusting assembly is provided with one workpiece clamping assembly. Every three sets of radial supporting and distance adjusting assemblies form a group, the lengths of the radial supporting rods in the three sets of radial supporting and distance adjusting assemblies in the same group are the same, and the lengths of the radial supporting rods in the radial supporting and distance adjusting assemblies in different groups are different; the pushing body locking and limiting assembly is arranged between the pushing body and the base body. The thin-wall cylindrical workpiece auxiliary clamp can adapt to thin-wall cylindrical workpieces of different sizes and specifications, the number of auxiliary clamps is reduced, the outer circle face and the inner hole face of the workpiece can be machined only through one-time clamping, the machining efficiency is improved, introduction of form and position errors is avoided, and the workpiece machining precision is improved.

Description

Technical Field

[0001] This utility model belongs to the field of machining fixture technology, and in particular relates to a general-purpose auxiliary fixture for turning thin-walled cylindrical workpieces. Background Technology

[0002] When thin-walled cylindrical workpieces need to be machined, they cannot be directly clamped and fixed on the three-jaw chuck of the lathe. A separate auxiliary fixture must be designed. First, the thin-walled cylindrical workpiece needs to be clamped and fixed on the auxiliary fixture, and then the auxiliary fixture with the thin-walled cylindrical workpiece clamped on the three-jaw chuck of the lathe is clamped.

[0003] Currently, auxiliary fixtures for traditional thin-walled cylindrical workpieces are generally specialized, with one set of auxiliary fixtures only suitable for one type of workpiece. Once the radial dimension and wall thickness of the workpiece change, the auxiliary fixture must be remanufactured, which leads to increased cost of auxiliary fixtures and consequently increased processing cost of the workpiece.

[0004] Furthermore, when traditional specialized auxiliary fixtures clamp and fix thin-walled cylindrical workpieces, if the inner surface of the workpiece is used as the machining surface, the auxiliary fixture will interfere with the outer surface of the workpiece; conversely, if the outer surface of the workpiece is used as the machining surface, the auxiliary fixture will interfere with the inner surface of the workpiece. Therefore, in order to complete the machining of both the inner and outer surfaces of the workpiece, the workpiece must be clamped twice. This not only reduces machining efficiency, but the second clamping of the workpiece will also inevitably introduce form and position errors, thus affecting the machining accuracy of the workpiece. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a universal auxiliary fixture for turning thin-walled cylindrical workpieces. It can adapt to thin-walled cylindrical workpieces with different radial dimensions and wall thicknesses, significantly reducing the number of spare auxiliary fixtures, lowering auxiliary fixture costs, and further reducing workpiece processing costs. Thin-walled cylindrical workpieces only need to be clamped once to meet the processing requirements of the outer cylindrical surface and inner hole surface, eliminating the need for secondary clamping. This not only improves processing efficiency but also avoids the introduction of form and position errors, further improving the processing accuracy of the workpiece.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a general-purpose auxiliary fixture for turning thin-walled cylindrical workpieces, comprising a base body, a pusher body, a radial support adjustment assembly, a workpiece clamping assembly, and a pusher body locking and limiting assembly; the pusher body is disposed within the base body; the radial support adjustment assembly is disposed on the base body, and the radial support adjustment assembly contacts and engages with the pusher body; there are three sets of radial support adjustment assemblies, which are evenly distributed along the circumference of the base body; the workpiece clamping assembly is disposed on the radial support adjustment assembly, and there are three sets of workpiece clamping assemblies, with each set of radial support adjustment assemblies equipped with one set of workpiece clamping assembly; the pusher body locking and limiting assembly is disposed between the pusher body and the base body.

[0007] The base body adopts a two-stage stepped cylindrical structure, consisting of a small-diameter section and a large-diameter section. The small-diameter section is a solid structure, and the base body is clamped and engaged with the three-jaw chuck of the lathe via the small-diameter section. The large-diameter section is a hollow cylindrical structure, and three radial support adjustment component mounting slots are provided at the opening of the large-diameter section. The three radial support adjustment component mounting slots are evenly distributed along the circumference of the base body.

[0008] The jacking body adopts a two-stage stepped cylindrical structure, consisting of a straight rod section and a semi-ellipsoidal section. The jacking body is located inside the cylindrical cavity of the large-diameter section of the base body, and the jacking body and the large-diameter section of the base body are coaxially distributed. One end of the straight rod section is threadedly connected to the small-diameter section of the base body, and the other end of the straight rod section is connected to the small end of the semi-ellipsoidal section. An internal hexagonal countersunk hole is provided at the center of the large end of the semi-ellipsoidal section.

[0009] The jacking body locking and limiting assembly includes a locking and limiting clamp, a rubber washer, a locking and limiting screw, and a transition support screw; the rubber washer is fitted onto the straight rod section of the jacking body; the locking and limiting clamp is fitted onto the rubber washer; the locking and limiting screw is located at the opening of the locking and limiting clamp; the transition support screw connects the locking and limiting clamp to the small-diameter section of the base body; screw tightening tool clearance windows are provided on the cylindrical walls of the large-diameter section of the base body on both sides of the jacking body locking and limiting assembly.

[0010] The radial support adjustment assembly includes a radial support rod, a ball-head block, a positioning block, a guide slide, a guide limiting slider, and a return spring. The radial support rod is inserted into the radial support adjustment assembly mounting slot, with one end of the radial support rod located inside the large-diameter section of the base body, and the other end extending outside the radial support adjustment assembly mounting slot of the base body. The ball-head block is fixedly disposed at one end of the radial support rod, and the ball-head block abuts against the outer arc surface of the semi-ellipsoidal section of the jacking body. The positioning block is fixedly disposed at the other end of the radial support rod, and the positioning block is located outside the radial support adjustment assembly mounting slot of the base body. The guide slide... A guide slide is fixedly installed in the middle of the radial support rod. The guide slide is located inside the radial support adjustment component mounting slot of the base body. A guide limiting slide groove is provided on the inner surface of the radial support adjustment component mounting slot. The guide limiting slider is fixedly installed on the guide slide and is located in the guide limiting slide groove. The radial support rod, ball head block, positioning block, guide slide, and guide limiting slider only have linear sliding freedom relative to the guide limiting slide groove. The return spring is sleeved on the radial support rod. One end of the return spring is in contact with the guide slide, and the other end of the return spring is in contact with the radial support adjustment component mounting slot.

[0011] Each set of three radial support adjustment components forms a group. The radial support rods in the three sets of radial support adjustment components in the same group have the same length, while the radial support rods in the radial support adjustment components in different groups have different lengths.

[0012] The workpiece clamping assembly includes a U-shaped support, a support adapter screw, a workpiece clamping rubber pad, a workpiece clamping clamping screw, and a workpiece clamping rubber pressure head. The U-shaped support has the same orientation as the cylindrical opening of the large-diameter section of the base body. The U-shaped support is mounted on the positioning block of the radial support adjustment assembly, and the U-shaped support and the positioning block are fixedly connected by the support adapter screw. The workpiece clamping clamping screw is mounted on the upper support arm of the U-shaped support, and the workpiece clamping rubber pressure head is fixedly mounted on the screw end of the workpiece clamping clamping screw. The workpiece clamping rubber pad is fixedly mounted on the lower support arm of the U-shaped support, and the workpiece clamping rubber pad is directly opposite the workpiece clamping rubber pressure head.

[0013] The beneficial effects of this utility model are:

[0014] This utility model discloses a universal auxiliary fixture for turning thin-walled cylindrical workpieces. It can be adapted to thin-walled cylindrical workpieces with different radial dimensions and wall thicknesses, significantly reducing the number of spare auxiliary fixtures, lowering auxiliary fixture costs, and further reducing workpiece processing costs. Thin-walled cylindrical workpieces only need to be clamped once to meet the processing requirements of the outer cylindrical surface and inner hole surface, eliminating the need for secondary clamping. This not only improves processing efficiency but also avoids the introduction of form and position errors, further improving the processing accuracy of the workpiece. Attached Figure Description

[0015] Figure 1 This is a schematic diagram (view 1) of a general-purpose auxiliary fixture (integral) for turning thin-walled cylindrical workpieces according to the present invention.

[0016] Figure 2 This is a schematic diagram (perspective 2) of a general-purpose auxiliary fixture (integral) for turning thin-walled cylindrical workpieces according to the present invention.

[0017] Figure 3 This is a structural schematic diagram (section view) of a general-purpose auxiliary fixture for turning thin-walled cylindrical workpieces according to the present invention (view 3);

[0018] Figure 4 This is a schematic diagram of the structure of the base body of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the jacking body of this utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the top-pushing body locking and limiting assembly of this utility model;

[0021] Figure 7 This is a schematic diagram of the radial support pitch adjustment assembly of this utility model;

[0022] Figure 8 This is a schematic diagram of the workpiece clamping assembly of this utility model;

[0023] Figure 9 This is a schematic diagram (view 1) of using the general-purpose auxiliary fixture (with short radial support rod) for turning thin-walled cylindrical workpieces of this utility model to clamp and fix thin-walled cylindrical workpieces (small radial dimension specification);

[0024] Figure 10 This is a schematic diagram (perspective 2) of using the general-purpose auxiliary fixture (with short radial support rod) for turning thin-walled cylindrical workpieces of this utility model to clamp and fix thin-walled cylindrical workpieces (small radial dimension specification);

[0025] Figure 11 This is a schematic diagram (perspective 2) of using the general-purpose auxiliary fixture (with the radial support rod being the long dimension) for machining thin-walled cylindrical workpieces of this utility model to clamp and fix thin-walled cylindrical workpieces (large radial dimension specification);

[0026] In the diagram, I—base body, II—pushing body, III—radial support adjustment assembly, IV—workpiece clamping assembly, V—pushing body locking and limiting assembly, 1—small diameter section base body, 2—large diameter section base body, 3—radial support adjustment assembly mounting slot, 4—straight rod section, 5—semi-ellipsoidal section, 6—internal hexagon countersunk hole, 7—locking and limiting clamp, 8—rubber washer, 9—locking and limiting screw, 10—adapter support screw, 11—radial support rod, 12—ball head block, 13—positioning block, 14—guide slide, 15—guide limiting slider, 16—reset spring, 17—guide limiting slide groove, 18—U-shaped support, 19—support adapter screw, 20—workpiece clamping rubber pad, 21—workpiece clamping clamping screw, 22—workpiece clamping rubber pressure head, 23—screw tightening tool clearance window, 24—thin-walled cylindrical workpiece. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1-11 As shown, a general-purpose auxiliary fixture for turning thin-walled cylindrical workpieces includes a base body I, a pusher body II, a radial support adjustment assembly III, a workpiece clamping assembly IV, and a pusher body locking and limiting assembly V. The pusher body II is disposed inside the base body I. The radial support adjustment assembly III is disposed on the base body I and is in contact with the pusher body II. There are three sets of radial support adjustment assemblies III, which are evenly distributed along the circumference of the base body I. The workpiece clamping assembly IV is disposed on the radial support adjustment assembly III. There are three sets of workpiece clamping assemblies IV, and each set of radial support adjustment assembly III is equipped with one set of workpiece clamping assembly IV. The pusher body locking and limiting assembly V is disposed between the pusher body II and the base body I.

[0029] The base body I adopts a two-stage stepped cylindrical structure, namely a small-diameter section base body 1 and a large-diameter section base body 2. The small-diameter section base body 1 is a solid structure, and the base body I is clamped and engaged with the three-jaw chuck of the lathe through the small-diameter section base body 1. The large-diameter section base body 2 is a hollow cylindrical structure, and a radial support adjustment component mounting slot 3 is provided at the opening of the large-diameter section base body 2. There are three radial support adjustment component mounting slots 3, and the three radial support adjustment component mounting slots 3 are evenly distributed along the circumference of the base body I.

[0030] The jacking body II adopts a two-stage stepped cylindrical structure, consisting of a straight rod section 4 and a semi-ellipsoidal section 5. The jacking body II is located inside the cylindrical cavity of the large-diameter section 2 of the base body I, and the jacking body II is coaxially distributed with the large-diameter section 2. One end of the straight rod section 4 is threadedly connected to the small-diameter section 1 of the base body I, and the other end of the straight rod section 4 is connected to the small end of the semi-ellipsoidal section 5. An internal hexagonal countersunk hole 6 is provided at the center of the large end of the semi-ellipsoidal section 5.

[0031] The jacking body locking and limiting assembly V includes a locking and limiting clamp 7, a rubber washer 8, a locking and limiting screw 9, and a transition support screw 10; the rubber washer 8 is fitted onto the straight rod section 4 of the jacking body II; the locking and limiting clamp 7 is fitted onto the rubber washer 8; the locking and limiting screw 9 is located at the opening of the locking and limiting clamp 7; the transition support screw 10 connects the locking and limiting clamp 7 to the small-diameter section seat 1 of the base body I; screw tightening tool clearance windows 23 are provided on the cylindrical walls of the large-diameter section seat 2 on both sides of the jacking body locking and limiting assembly V.

[0032] The radial support adjustment assembly III includes a radial support rod 11, a ball-head top block 12, a positioning block 13, a guide slide 14, a guide limiting slider 15, and a return spring 16. The radial support rod 11 is inserted into the radial support adjustment assembly mounting slot 3, with one end of the radial support rod 11 located inside the large-diameter section of the base body I, and the other end extending to the outside of the radial support adjustment assembly mounting slot 3 of the base body I. The ball-head top block 12 is fixedly disposed at one end of the radial support rod 11, and the ball-head top block 12 abuts against the outer arc surface of the semi-ellipsoidal section 5 of the jacking body II. The positioning block 13 is fixedly disposed at the other end of the radial support rod 11, and the positioning block 13 is located outside the radial support adjustment assembly mounting slot 3 of the base body I. The guide slide 14 is fixedly installed in the middle of the radial support rod 11. The guide slide 14 is located inside the radial support adjustment component mounting slot 3 of the base body I. A guide limiting slide groove 17 is provided on the inner surface of the radial support adjustment component mounting slot 3. The guide limiting slider 15 is fixedly installed on the guide slide 14 and is located in the guide limiting slide groove 17. The radial support rod 11, the ball head block 12, the positioning block 13, the guide slide 14, and the guide limiting slider 15 only have linear sliding freedom relative to the guide limiting slide groove 17. The return spring 16 is fitted on the radial support rod 11. One end of the return spring 16 is in abutting contact with the guide slide 14, and the other end of the return spring 16 is in abutting contact with the radial support adjustment component mounting slot 3.

[0033] Three sets of the radial support adjustment assembly III form a group. The radial support rods 11 in the three sets of radial support adjustment assembly III in the same group have the same length, while the radial support rods 11 in the radial support adjustment assembly III in different groups have different lengths.

[0034] The workpiece clamping assembly IV includes a U-shaped support 18, a support adapter screw 19, a workpiece clamping rubber pad 20, a workpiece clamping clamping screw 21, and a workpiece clamping rubber pressure head 22. The U-shaped support 18 has the same U-shaped opening orientation as the cylindrical opening orientation of the large-diameter section of the base body 2 of the base body I. The U-shaped support 18 is mounted on the positioning block 13 of the radial support adjustment assembly III, and the U-shaped support 18 and the positioning block 13 are fixedly connected by the support adapter screw 19. The workpiece clamping clamping screw 21 is mounted on the upper support arm of the U-shaped support 18, and the workpiece clamping rubber pressure head 22 is fixedly mounted on the screw end of the workpiece clamping clamping screw 21. The workpiece clamping rubber pad 20 is fixedly mounted on the lower support arm of the U-shaped support 18, and the workpiece clamping rubber pad 20 is directly opposite the workpiece clamping rubber pressure head 22.

[0035] The following describes a single use of this utility model with reference to the accompanying drawings:

[0036] Before use, first select a set of radial support adjustment components III and assemble them on the general auxiliary fixture of this utility model. The length of the radial support rod 11 of the three sets of radial support adjustment components III in this set is adapted to the radial dimension of the thin-walled cylindrical workpiece 24 to be processed.

[0037] Before machining, the small-diameter section of the base body I, the base body 1, is first fixedly clamped onto the three-jaw chuck of the machine tool, thus realizing the installation of the auxiliary fixture. Then, a suitable hexagonal wrench is inserted into the hexagonal countersunk hole 6 at the center of the large end of the semi-ellipsoidal section 5 of the pusher body II. The pusher body II is then tightened using the hexagonal wrench, causing it to rotate outwards axially. Simultaneously, the ball head block 12 of the radial support adjustment assembly III slides along the semi-ellipsoidal section 5 of the pusher body II from the large-diameter side to the small-diameter side. Under the thrust of the return spring 16, the assembly consisting of the radial support rod 11, the ball head block 12, the positioning block 13, the guide slide 14, and the guide limiting slider 15 moves along the guide limiting slide groove 17 toward the center of the auxiliary fixture, thereby driving the workpiece clamping assembly IV to move synchronously toward the center until the distance between the upper surface of the workpiece clamping rubber pad 20 on the lower support arm of the U-shaped support 18 of the workpiece clamping assembly IV and the center of the auxiliary fixture is less than the radius of the thin-walled cylindrical workpiece 24.

[0038] The axial end edge of the thin-walled cylindrical workpiece 24 is inserted into the gap between the upper and lower support arms of the U-shaped support 18 of the workpiece clamping assembly IV until the axial end edge of the thin-walled cylindrical workpiece 24 abuts against the inner surface of the sealed end of the U-shaped support 18, thereby achieving axial positioning of the thin-walled cylindrical workpiece 24. In the axial direction, there is no interference between the outer circular surface and the inner hole surface of the thin-walled cylindrical workpiece 24 outside the clamping range of the workpiece clamping assembly IV, which provides the conditions for the continuous machining of the outer circular surface and the inner hole surface of the thin-walled cylindrical workpiece 24.

[0039] The pusher II is tightened again using the appropriate Allen wrench, causing it to rotate inward along the axial direction. This causes the ball head block 12 to slide along the semi-ellipsoidal segment 5 of the pusher II from the small diameter side to the large diameter side. This, in turn, causes the entire assembly consisting of the radial support rod 11, the ball head block 12, the positioning block 13, the guide slide 14, and the guide limiting slider 15 to move along the guide limiting slide groove 17 toward the circumference of the auxiliary fixture. During this process, the return spring 16 is compressed until the lower support arm of the U-shaped support 18 of the workpiece clamping assembly IV radially supports the thin-walled cylindrical workpiece 24 through the workpiece clamping rubber pad 20, thereby achieving the initial radial positioning of the thin-walled cylindrical workpiece 24.

[0040] Select a wrench that matches the workpiece clamping screw 21, and use the wrench to tighten the two workpiece clamping screws 21 on the upper support arm of the U-shaped support 18 until the workpiece clamping screw 21 is radially pressed onto the thin-walled cylindrical workpiece 24 through the workpiece clamping rubber pressure head 22, thereby achieving complete radial positioning of the thin-walled cylindrical workpiece 24.

[0041] After the thin-walled cylindrical workpiece 24 is completely fixed and clamped onto the auxiliary fixture of this utility model, select a suitable hex wrench and use the screw tightening tool to make way for the locking limit screw 9 through the screw tightening tool window 23, thereby causing the locking limit clamp 7 to deform inward and at the same time, the straight rod section 4 of the push body II is locked and fixed through the rubber washer 8, so that the rotational motion of the push body II is locked.

[0042] Once all the above preparations are completed, the outer cylindrical surface and inner hole surface of the thin-walled cylindrical workpiece 24 can be continuously machined using a lathe, eliminating the need for secondary clamping. This not only avoids the introduction of form and position errors, but also further improves the machining accuracy of the workpiece and increases machining efficiency.

[0043] The solutions in the embodiments are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications that do not depart from the scope of protection of this utility model are included in the scope of protection of this utility model.

Claims

1. A general-purpose auxiliary fixture for turning thin-walled cylindrical workpieces, characterized in that: The device includes a base body, a pushing body, a radial support adjustment assembly, a workpiece clamping assembly, and a pushing body locking and limiting assembly. The pushing body is disposed within the base body. The radial support adjustment assembly is disposed on the base body and engages with the pushing body. There are three sets of radial support adjustment assemblies, which are evenly distributed along the circumference of the base body. The workpiece clamping assembly is disposed on the radial support adjustment assembly. There are three sets of workpiece clamping assemblies, with each set of radial support adjustment assemblies equipped with one workpiece clamping assembly. The pushing body locking and limiting assembly is disposed between the pushing body and the base body.

2. The general-purpose auxiliary fixture for turning thin-walled cylindrical workpieces according to claim 1, characterized in that: The base body adopts a two-stage stepped cylindrical structure, consisting of a small-diameter section and a large-diameter section. The small-diameter section is a solid structure, and the base body is clamped and engaged with the three-jaw chuck of the lathe via the small-diameter section. The large-diameter section is a hollow cylindrical structure, and three radial support adjustment component mounting slots are provided at the opening of the large-diameter section. The three radial support adjustment component mounting slots are evenly distributed along the circumference of the base body.

3. A general-purpose auxiliary fixture for turning thin-walled cylindrical workpieces according to claim 2, characterized in that: The jacking body adopts a two-stage stepped cylindrical structure, consisting of a straight rod section and a semi-ellipsoidal section. The jacking body is located inside the cylindrical cavity of the large-diameter section of the base body, and the jacking body and the large-diameter section of the base body are coaxially distributed. One end of the straight rod section is threadedly connected to the small-diameter section of the base body, and the other end of the straight rod section is connected to the small end of the semi-ellipsoidal section. An internal hexagonal countersunk hole is provided at the center of the large end of the semi-ellipsoidal section.

4. A general-purpose auxiliary fixture for turning thin-walled cylindrical workpieces according to claim 3, characterized in that: The jacking body locking and limiting assembly includes a locking and limiting clamp, a rubber washer, a locking and limiting screw, and a transition support screw; the rubber washer is fitted onto the straight rod section of the jacking body; the locking and limiting clamp is fitted onto the rubber washer; the locking and limiting screw is located at the opening of the locking and limiting clamp; the transition support screw connects the locking and limiting clamp to the small-diameter section of the base body; screw tightening tool clearance windows are provided on the cylindrical walls of the large-diameter section of the base body on both sides of the jacking body locking and limiting assembly.

5. A general-purpose auxiliary fixture for turning thin-walled cylindrical workpieces according to claim 3, characterized in that: The radial support adjustment assembly includes a radial support rod, a ball-head block, a positioning block, a guide slide, a guide limiting slider, and a return spring. The radial support rod is inserted into the radial support adjustment assembly mounting slot, with one end of the radial support rod located inside the large-diameter section of the base body, and the other end extending outside the radial support adjustment assembly mounting slot of the base body. The ball-head block is fixedly disposed at one end of the radial support rod, and the ball-head block abuts against the outer arc surface of the semi-ellipsoidal section of the jacking body. The positioning block is fixedly disposed at the other end of the radial support rod, and the positioning block is located outside the radial support adjustment assembly mounting slot of the base body. The guide slide... A guide slide is fixedly installed in the middle of the radial support rod. The guide slide is located inside the radial support adjustment component mounting slot of the base body. A guide limiting slide groove is provided on the inner surface of the radial support adjustment component mounting slot. The guide limiting slider is fixedly installed on the guide slide and is located in the guide limiting slide groove. The radial support rod, ball head block, positioning block, guide slide, and guide limiting slider only have linear sliding freedom relative to the guide limiting slide groove. The return spring is sleeved on the radial support rod. One end of the return spring is in contact with the guide slide, and the other end of the return spring is in contact with the radial support adjustment component mounting slot.

6. A general-purpose auxiliary fixture for turning thin-walled cylindrical workpieces according to claim 5, characterized in that: Each set of three radial support adjustment components forms a group. The radial support rods in the three sets of radial support adjustment components in the same group have the same length, while the radial support rods in the radial support adjustment components in different groups have different lengths.

7. A general-purpose auxiliary fixture for turning thin-walled cylindrical workpieces according to claim 5, characterized in that: The workpiece clamping assembly includes a U-shaped support, a support adapter screw, a workpiece clamping rubber pad, a workpiece clamping clamping screw, and a workpiece clamping rubber pressure head. The U-shaped support has the same orientation as the cylindrical opening of the large-diameter section of the base body. The U-shaped support is mounted on the positioning block of the radial support adjustment assembly, and the U-shaped support and the positioning block are fixedly connected by the support adapter screw. The workpiece clamping clamping screw is mounted on the upper support arm of the U-shaped support, and the workpiece clamping rubber pressure head is fixedly mounted on the screw end of the workpiece clamping clamping screw. The workpiece clamping rubber pad is fixedly mounted on the lower support arm of the U-shaped support, and the workpiece clamping rubber pad is directly opposite the workpiece clamping rubber pressure head.

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