Machining clamp for thin-wall cylindrical part

Abstract

The utility model provides a thin-wall cylindrical part machining clamp which comprises a clamp base and a clamp cover, and the clamp cover is arranged above the clamp base and connected with the clamp base through threads. And a positioning ring which is the same as a part to be machined in outer diameter is arranged in the clamp cover. The clamping mode of axial compression is adopted, stress concentration after a workpiece is machined is avoided, the problem that stress deformation is prone to occurring after a traditional clamp clamps the outer side or the inner side of a thin-wall part for machining is solved, the overall structure is simple and practical, positioning precision is high, machining is easy, maintenance cost is low, and the clamping device is suitable for cylindrical parts of various sizes.

Description

Technical Field

[0001] This utility model relates to the field of ultra-precision parts processing and manufacturing technology, specifically a processing fixture for thin-walled cylindrical parts. Background Technology

[0002] In recent years, ultra-precision machining technology has been increasingly applied in aerospace, advanced optics, and other fields. With the improvement of ultra-precision machining accuracy and optical design levels, the requirements for the relative positions of products have become more stringent. However, in actual production, due to the thinness and length of the machined parts, the workpiece is easily affected by machining and clamping forces, and residual stress is easily generated inside the workpiece, making it prone to deformation after disassembly. Previous technologies have designed dedicated fixtures for long, thin-walled cylindrical parts, but the design and manufacturing of these fixtures are extremely difficult. To save costs and improve processes, it is necessary to design dedicated fixtures to ensure the internal cylindricity accuracy after machining. Summary of the Invention

[0003] Purpose of the utility model: The purpose of this utility model is to solve the above-mentioned technical problems and provide a machining fixture for thin-walled cylindrical parts.

[0004] Technical solution: The present invention provides a machining fixture for thin-walled cylindrical parts, comprising a fixture base and a fixture cover. The fixture cover is disposed above the fixture base and is connected to the fixture base by threads. A positioning ring with the same outer diameter as the part to be machined is provided inside the fixture cover.

[0005] Furthermore, the upper part of the fixture base is a support platform, and the support platform is provided with a clearance hole, which is coaxial with the positioning ring.

[0006] Furthermore, the diameter of the clearance hole is larger than the inner diameter of the part to be processed but smaller than the outer diameter of the part to be processed.

[0007] Furthermore, the fixture cover is provided with multiple parallelism detection holes.

[0008] Beneficial effects: The machining fixture for thin-walled cylindrical parts of this utility model has the following beneficial effects:

[0009] 1. This utility model adopts an axial clamping clamping method, which avoids stress concentration after workpiece processing and reduces the problem of stress deformation that easily occurs after traditional fixtures are clamped on the outside or inside of thin-walled parts. The overall structure is simple and practical, with high positioning accuracy, easy processing, low maintenance cost, and is suitable for cylindrical parts of various sizes.

[0010] 2. The clearance hole provides clearance space for the grinding wheel used to machine thin-walled parts;

[0011] 3. Using a height gauge, the parallelism is measured by detecting the height difference at multiple locations through the parallelism detection hole;

[0012] 4. The locating ring is used to ensure the positioning accuracy of the part to be processed and to ensure the coaxiality of the part to be processed and the clearance hole. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the fixture cover.

[0015] Figure 3 for Figure 2 Top view;

[0016] Figure 4 This is a schematic diagram of the fixture base.

[0017] In the figure: 1-Clamp cover; 2-Clamp base; 11-Parallelism detection hole; 12-Positioning ring; 21-Supporting platform; 22-Void hole; 3-Part to be processed. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1-4 As shown, this utility model discloses a machining fixture for thin-walled cylindrical parts, comprising a fixture base 2 and a fixture cover 1. The fixture cover 1 is disposed above the fixture base 2 and is threadedly connected to the fixture base 2. A positioning ring 12 with the same outer diameter as the part 3 to be machined is provided inside the fixture cover 1 for positioning the part 3 and ensuring that the part is coaxial with the clearance hole 22. Above the fixture base 2 is a support platform 21, on which the clearance hole 22 is provided, coaxial with the positioning ring 12. The diameter of the clearance hole 22 is larger than the inner diameter of the part 3 to be machined but smaller than the outer diameter of the part 3 to be machined, for clearance when a grinding stone passes through the part 3. The fixture cover 1 is provided with multiple parallelism detection holes 11 for using a height gauge to check the parallelism of the part 3 to be machined. If the data measured by the height gauge at different locations are the same, it proves that the parallelism of the upper and lower end faces of the part 3 to be machined is not a problem; otherwise, there is a problem.

[0020] In practical use, first process the cylindrical part 3 to be processed until both ends are parallel, place it on the support platform 21 of the fixture base 2, then connect the fixture cover 1 to the fixture base 2 by thread, rotate the fixture cover 1 to press the cylindrical part to be processed, the upper end of the part 3 to be processed is located in the positioning ring 12, and the lower end is supported by the support platform 21; the parallelism of the part 3 to be processed can be checked by using a height gauge through the parallelism detection hole 11. If there is no problem, use a grinding stone to rotate at high speed through the inner wall of the part 3 to reach the clearance hole 22 for processing.

[0021] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A machining jig for a thin-walled cylindrical part, characterized by: The clamp base and the clamp cover are provided, the clamp cover is arranged above the clamp base and is connected with the clamp base through threads, and a positioning ring with the same outer diameter as the part to be machined is arranged in the clamp cover.

2. The machining jig for a thin-walled cylindrical part according to claim 1, characterized in that: The clamp base is provided with a bearing platform, and the bearing platform is provided with a clearance hole coaxial with the positioning ring.

3. A thin-walled cylindrical part machining jig according to claim 2, characterized in that: The diameter of the clearance hole is greater than the inner diameter of the part to be machined but less than the outer diameter of the part to be machined.

4. The machining fixture for thin-walled cylindrical parts according to claim 1, characterized in that: The clamp cover is provided with a plurality of parallelism detection holes.

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