A mirror polishing jig structure for a stepped hole of a thin-walled part

Abstract

The utility model belongs to the field of grinding technology of precision machining, disclose a kind of mirror surface grinding fixture structure of thin-walled class parts step inner hole, including support and the tooling base being fixed on support, tooling base inside is equipped with the assembly cavity for clamping the product to be ground, and the product to be ground and assembly cavity clearance fit;The inner wall of assembly cavity is the stepped structure that is adapted to the shape of the product to be ground;It further includes annular protective gasket being set at the assembly cavity clamping entrance, for the end of the product to be ground is protected;It further includes the cover plate being set at the outer side of protective gasket, and cover plate and tooling base detachably connect.The utility model's structure can be stabilized clamped and protected to the product to be ground, so that finished product has no pressure injury and collapse edge and other defects, improve the overall machining efficiency, quality and reliability of finished product.

Description

Technical Field

[0001] This utility model relates to the field of grinding technology in precision machining, and in particular to a mirror grinding fixture structure for the inner hole of stepped thin-walled parts. Background Technology

[0002] In the field of precision machining, the grinding quality of the stepped inner hole in thin-walled parts directly affects the performance and service life of the part. These parts have extremely high requirements for the surface roughness, dimensional accuracy, and concentricity of the inner hole. Typically, the inner hole needs to be ground to a mirror finish, with a surface roughness of Ra0.1μm or better, while ensuring dimensional accuracy within ±0.01 mm and concentricity not exceeding 0.01 mm. Furthermore, the grinding process must ensure that the thin-walled portion does not deform and that the inner hole edges are free from collapse or damage to maintain the overall performance and safety of the part.

[0003] However, existing grinding processes suffer from problems such as unreasonable clamping methods leading to thin-wall deformation, lack of inner hole edge protection causing edge collapse damage, insufficient grinding stability and precision, and poor consumable versatility and high costs, which severely restrict technological progress and production efficiency. Furthermore, in actual production, manual grinding is often relied upon to compensate for process deficiencies, but this is not only inefficient but also makes it difficult to guarantee the consistency and stability of grinding quality, failing to meet the requirements of large-scale production and high-quality applications. Utility Model Content

[0004] The purpose of this invention is to propose a mirror-polishing fixture structure for the stepped inner hole of thin-walled parts. This fixture can stably clamp and protect the stepped inner hole of thin-walled parts, ensuring that the finished product is free from defects such as pressure marks and edge collapse, thereby improving the overall processing efficiency, quality, and reliability of the finished product.

[0005] The technical solution adopted to achieve the purpose of this utility model is: A mirror polishing fixture structure for the stepped inner hole of a thin-walled part includes a bracket and a tooling base fixed on the bracket. The tooling base has an assembly cavity for clamping the product to be polished, and the product to be polished is clearance-fitted with the assembly cavity. The inner wall of the assembly cavity is a stepped structure adapted to the shape of the product to be polished. It also includes an annular protective gasket placed at the clamping entrance of the assembly cavity to protect the end of the product to be ground; It also includes a cover plate set on the outside of the protective pad, and the cover plate is detachably connected to the tooling base. The center of the cover plate is also provided with a clearance opening corresponding to the inner hole of the product to be ground.

[0006] Furthermore, the number of tooling bases is two or more.

[0007] Further, the protective shim includes an embedding portion and a clinging portion, and is integrally in a "convex" shape structure with a protruding inner edge; wherein the embedding portion is the protruding part of the inner edge, which is used to be embedded into the inner hole of the product to be ground and fit with the inner hole wall of the product to be ground; the clinging portion is arranged on the outer periphery of the embedding portion, and is used to closely fit with the end of the product to be ground.

[0008] Further, a shim embedding platform matched with the embedding portion is further opened on the inner hole wall of the end of the product to be ground that is matched with the protective shim.

[0009] Further, the product to be ground is in IT7 grade clearance fit with the assembly cavity.

[0010] Further, the cover plate includes a protective portion and a fixing portion, the protective portion is used to cover the end of the protective shim to protect the protective shim; the fixing portion is located on the outer periphery of the protective portion, and is used to connect with the tooling base.

[0011] Further, the bracket includes support plates and a connecting rod, the number of the support plates is two, which are respectively fixed at both ends of the connecting rod; the tooling base is fixedly connected to the connecting rod.

[0012] The beneficial effects of the utility model are as follows: The structure of the utility model can stably clamp and protect the stepped inner hole of thin-walled parts. The protective shim can avoid defects such as crush damage and edge collapse caused by the end of the product to be ground being directly impacted by the grinding medium. The cover plate further limits the axial degree of freedom of the product to be ground, preventing the product to be ground from axial movement due to vibration or centrifugal force during the grinding process, so as to ensure the stability and consistency of the grinding process; moreover, the arrangement of a plurality of tooling bases fully utilizes the space and working capacity of the grinding equipment, so that more products to be ground can be polished in the same time, and the overall production efficiency is improved. Brief Description of the Drawings

[0013] In order to illustrate the embodiments of the utility model or the technical solutions in the prior art more clearly, the utility model will be further described below with reference to the accompanying drawings and embodiments. The following described accompanying drawings are only part of the embodiments of the utility model, and those of ordinary skill in the art can further obtain other accompanying drawings based on these accompanying drawings without creative efforts. Figure 1 is a schematic diagram of a three-dimensional structure of the structure of the utility model; Figure 2 is Figure 1 a schematic diagram of an exploded structure; Figure 3 is a schematic diagram of a front view structure of the structure of the utility model; Figure 4 is along Figure 3 a schematic diagram of a structure sectioned along the A-A plane therein; Figure 5 yes Figure 4 An enlarged schematic diagram of point A in the middle; Figure 6 It is a structural schematic diagram of the tooling base and its assembled components; Figure 7 yes Figure 6 A schematic diagram of an exploded structure; Figure 8 This is a schematic diagram of the main structure of a tooling base of this utility model; Figure 9 It is along Figure 8 A schematic diagram of a structure viewed in cross section BB; Figure 10 This is a three-dimensional structural diagram of the product to be ground according to this utility model; Figure 11 This is a schematic diagram of the main structure of the product to be ground according to this utility model; Figure 12 It is along Figure 11 A schematic diagram of a structure viewed in cross-section via the C-plane; Figure 13 This is a three-dimensional structural diagram of the cover plate of this utility model; Figure 14 yes Figure 13 A structural diagram from another perspective; Figure 15 This is a schematic diagram of the structure of a protective gasket of this utility model.

[0014] In the diagram: 1. Bracket; 2. Tooling base; 3. Product to be ground; 4. Assembly cavity; 5. Protective gasket; 6. Cover plate; 7. Gasket embedding platform; 8. Fastener; 9. First fastening hole; 10. Second fastening hole; 11. First connecting hole; 12. Second connecting hole; 13. First locking hole; 14. Second locking hole; 15. First locking element; 16. Second locking element; 101. Support plate; 102. Connecting rod; 201. Assembly part; 202. Connecting part; 501. Embedded part; 502. Fitting part; 601. Protective part; 602. Fixing part. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] like Figures 1 to 15 As shown, a mirror polishing fixture structure for a stepped inner hole of a thin-walled part includes a bracket 1 and a tooling base 2 fixed on the bracket 1. The tooling base 2 has an assembly cavity 4 for clamping the product 3 to be polished. The product 3 to be polished is clearance-fitted with the assembly cavity 4. The inner wall of the assembly cavity 4 is a stepped structure adapted to the shape of the product 3 to be polished. It also includes an annular protective gasket 5 set at the clamping entrance of the assembly cavity 4, which is used to protect the end of the product 3 to be ground; It also includes a cover plate 6 located on the outside of the protective pad 5, and the cover plate 6 is detachably connected to the tooling base 2. The center of the cover plate 6 is also provided with a clearance opening corresponding to the inner hole of the product 3 to be ground.

[0017] In this invention, the assembly cavity 4 inside the tooling base 2 is designed as a stepped structure that adapts to the shape of the product 3 to be ground, facilitating clamping of the product 3. When the product 3 to be ground is inserted into the assembly cavity 4, due to the shape adaptation between the product 3 and the assembly cavity 4, the product 3 will naturally be positioned along the stepped structure. Each surface of the step can constrain the product 3 from different directions, limiting some degrees of freedom of the product 3 in the radial and axial directions, achieving preliminary precise positioning. At the same time, the product 3 to be ground and the assembly cavity 4 adopt a clearance fit, which not only ensures that the product 3 can be smoothly inserted and removed, but also accommodates to a certain extent the slight dimensional deviations of the product 3 caused by manufacturing errors, allowing the product 3 to fit better with the assembly cavity 4, further enhancing the stability of the clamping.

[0018] The protective gasket 5 is installed at the clamping entrance of the assembly cavity 4. Its main function is to protect the end of the product 3 to be ground during the grinding process. During grinding, the grinding media such as grinding particles and polishing fluid will generate impact and friction on the product 3 to be ground. The protective gasket 5, with its good elasticity and wear resistance, prevents the end of the product 3 to be ground from being directly impacted by the grinding media, thus avoiding defects such as crushing and edge collapse.

[0019] The cover plate 6 is detachably connected to the fixture base 2. After being installed on the outer side of the protective gasket 5, it will apply a certain pressure to the protective gasket 5, making it closely fit the end of the product 3 to be ground, while further restricting the axial degree of freedom of the product 3 to be ground, preventing the product 3 to be ground from axial movement due to vibration, centrifugal force or other effects during the grinding process, and ensuring the stability and consistency of the grinding process.

[0020] As shown in Figures 1 to 3 , in the present utility model, the number of the fixture bases 2 is two or more. Setting the number of the fixture bases 2 to two or more enables batch processing. During the grinding operation, a plurality of fixture bases 2 can clamp the products 3 to be ground at the same time, changing the original processing mode of a single product 3 to be ground into parallel processing of a plurality of products 3 to be ground. The space and working capacity of the grinding equipment are fully utilized, so that more products 3 to be ground can be ground within the same time, and the overall production efficiency is improved. In a preferred embodiment of the present utility model, the number of the fixture bases 2 is five, which can clamp a plurality of products 3 to be ground at one time and realize simultaneous grinding.

[0021] As shown in Figure 5 and Figure 7 , in the present utility model, the protective gasket 5 comprises an embedded part 501 and a clinging part 502, and is integrally in a "convex" structure with a protruding inner edge; wherein the embedded part 501 is the protruding part of the inner edge, which is used for being embedded into the inner hole of the product 3 to be ground and clinging to the inner hole wall of the product 3 to be ground; the clinging part 502 is arranged on the outer periphery of the embedded part 501, and is used for closely clinging to the end of the product 3 to be ground. The inner hole wall of the end where the product 3 to be ground is matched with the protective gasket 5 is further provided with a gasket embedding table 7 matched with the embedded part 501.

[0022] In actual operation, the end of the product 3 to be ground where the protective gasket 5 is arranged has a requirement for maintaining an acute angle at the product opening, while the other end of the product has no acute angle requirement, so that the other end does not need to be provided with a corresponding gasket. In addition, the other end of the fixture structure of the present utility model has extended beyond the end of the product 3 to be ground, and has a certain protective effect on the other end of the product 3 to be ground, as specifically shown in Figure 5 .

[0023] The insert portion 501 of the protective gasket 5 can position the protective gasket 5 from inside the product 3 to be ground, restricting the radial freedom of the protective gasket 5 and preventing radial wobbling caused by the impact of the grinding media during the grinding process. The close-fitting portion 502 is provided on the outer periphery of the insert portion 501 and fits tightly against the end of the product 3 to be ground, further fixing the product 3 to be ground in the axial direction, while protecting the end of the product 3 from direct impact and wear of the grinding media. In addition, the gasket insertion platform 7 opened on the inner wall of the product 3 to be ground cooperates with the insert portion 501 of the protective gasket 5, further enhancing the accuracy and stability of the positioning, ensuring a tight fit between the protective gasket 5 and the product 3 to be ground, and preventing loosening during the grinding process.

[0024] In this invention, the product to be ground 3 and the assembly cavity 4 are fitted with an IT7 clearance. This IT7 clearance fit ensures smooth insertion and removal of the product 3 from the assembly cavity 4 while providing precise positioning. The small tolerance range of the IT7 clearance fit prevents excessive movement of the product 3 within the assembly cavity 4, thus avoiding impacts on grinding accuracy, while also preventing clamping difficulties or damage to the surface of the product 3 due to insufficient clearance. This precise clearance fit achieves stable clamping of the product 3 during the grinding process, providing a foundation for high-quality mirror polishing.

[0025] like Figures 1 to 3 , Figures 6 to 7 As shown, in this utility model, the cover plate 6 includes a protective part 601 and a fixing part 602. The protective part 601 is used to cover the end of the protective pad 5 and protect the protective pad 5. The fixing part 602 is located on the outer periphery of the protective part 601 and is used to connect with the tooling base 2.

[0026] During the grinding process, the grinding media may cause some impact and wear to the protective gasket 5. The protective part 601 can absorb and disperse these forces, extending the service life of the protective gasket 5. The fixing part 602 is located on the outer periphery of the protective part 601 and is used to connect with the tooling base 2. The fixing part 602 and the tooling base 2 are fixedly connected by fasteners 8, and the fasteners 8 are bolts. This utility model uses bolt connection to firmly fix the cover plate 6 to the tooling base 2, thereby further pressing the protective gasket 5 and the product to be ground 3, ensuring that the product to be ground 3 will not undergo axial displacement during the grinding process, and ensuring the stability and consistency of the grinding.

[0027] In actual design, the fixing part 602 consists of several protrusions evenly distributed around the outer periphery of the protective part 601. Each protrusion has a first fastening hole 9, and the tooling base 2 has a second fastening hole 10 corresponding to the first fastening hole 9. There are two or more fixing parts 602, and the number of first fastening holes 9 and second fastening holes 10 corresponds. To ensure connection stability, it is preferable to have three fixing parts 602.

[0028] In this utility model, the tooling base 2 is integrally formed and includes an assembly part 201 and a connecting part 202. The assembly cavity 4 is opened in the assembly part 201, and the cover plate 6 is fixed on the assembly part 201. The connecting part 202 is used to fix and connect with the bracket 1.

[0029] like Figures 1 to 3 As shown, in this utility model, the bracket 1 includes a support plate 101 and a connecting rod 102. There are two support plates 101, which are respectively fixed at both ends of the connecting rod 102; the tooling base 2 is fixedly connected to the connecting rod 102.

[0030] The bracket 1 of this utility model, using the above-described structure, forms a stable frame structure. During actual assembly, the support plate 101 is fixed inside the hexagonal roller. The tooling base 2 is fixedly connected to the connecting rod 102, which enables the entire fixture structure to have high stability and rigidity. During the grinding process, the vibration and impact force generated by the grinding equipment can be effectively transmitted and dispersed through the bracket 1, reducing the impact on the tooling base 2 and the product to be ground 3, and ensuring the smooth progress of the grinding process.

[0031] like Figures 1 to 14 As shown, in one embodiment of this utility model, the connecting portion 202 of the tooling base 2 is provided with a first connecting hole 11 and a first locking hole 13 communicating with the first connecting hole 11, and the support plate 101 is provided with a second connecting hole 12 and a second locking hole 14 communicating with the second connecting hole 12. It also includes a first locking member 15 and a second locking member 16 corresponding to the first locking hole 13 and the second locking hole 14, and both the first locking member 15 and the second locking member 16 are locking bolts.

[0032] The connecting rod 102 passes through the first connecting hole 11 and its two ends are embedded in the second connecting holes 12. At the same time, after the first locking member 15 and the second locking member 16 pass through the first locking hole 13 and the second locking hole 14 respectively, the support plate 101 and the connecting part 202 are locked to the connecting rod 102.

[0033] The structure described above is mainly applicable to grinding the stepped inner holes of commonly used thin-walled parts, such as precision components that come into contact with blood.

[0034] The following is a detailed description of the processing technology using the structure of this utility model.

[0035] This process is mainly applicable to grinding the stepped inner holes of commonly used thin-walled parts, such as precision components involving blood contact, such as headless cannulas and extension tubes.

[0036] A mirror polishing process for stepped inner holes of thin-walled parts specifically includes the following steps: Step S1: Set a bracket 1 inside the hexagonal roller, and set a tooling base 2 on the bracket 1.

[0037] In this step, the hexagonal roller is a commonly used device in the field, such as the LMJ30 centrifugal grinding and polishing machine. It has six sides, which, when rotated by the centrifugal grinding equipment, create a complex and uniform motion trajectory for the internal abrasive particles and polishing fluid, thus ensuring better contact with the product 3 to be ground. The fixture base 2 is specially designed according to the shape and size of the product 3 to be ground, used for precise clamping of the product 3 to ensure the stability of the finished product during the grinding process.

[0038] In this step, the number of tooling bases 2 is two or more. By setting two or more tooling bases 2, this invention allows for the simultaneous grinding of multiple products 3 to be ground, achieving mass production, significantly improving production efficiency, and making it suitable for large-scale industrial production. In a preferred embodiment of this invention, the number of tooling bases 2 is five, which can clamp multiple products 3 to be ground at once and achieve simultaneous grinding.

[0039] Step S2: Embed the product 3 to be ground into the tooling base 2, and place a protective pad 5 at the end of the inner hole of the product 3 with a step.

[0040] In this step, the protective gasket 5 is made of materials with a certain degree of elasticity and wear resistance, such as rubber or specific plastics, selected according to actual needs. Its main function is to protect the end of the product 3 to be ground, preventing damage and edge collapse caused by the squeezing and collision of grinding particles during the grinding process, thus improving the overall quality and reliability of the finished product. Simultaneously, the protective gasket 5 can precisely fit the stepped area of ​​the inner hole of the product 3 to be ground, ensuring the dimensional accuracy of the inner hole grinding. In actual use, even if the gasket wears out during long-term use, only the gasket needs to be replaced; there is no need to replace the entire tooling base 2, greatly reducing consumable costs.

[0041] In this step, the concentricity between the protective gasket 5 and the inner hole of the product 3 to be ground is ≤0.01. Maintaining an extremely high concentricity of ≤0.01 between the protective gasket 5 and the inner hole of the product 3 to be ground ensures that the abrasive particles and polishing fluid have a uniform and consistent effect on all parts of the inner hole during the grinding process, further guaranteeing key quality indicators such as the dimensional accuracy, concentricity, and surface roughness of the inner hole.

[0042] Step S3: A cover plate 6 is installed on the outside of the protective gasket 5, and the cover plate 6 is fixedly connected to the tooling base 2. The cover plate 6 serves to limit and protect the protective gasket 5.

[0043] In this step, the cover plate 6 and the tooling base 2 are fixedly connected by fasteners 8, which are bolts. The cover plate 6 mainly serves to limit and protect the protective gasket 5, preventing the protective gasket 5 from shifting or falling off during the grinding process, ensuring that the protective gasket 5 is always in the correct position, and providing stable protection for the product 3 to be ground.

[0044] The protective pad 5 and cover plate 6 of this utility model effectively prevent the product 3 to be ground from being crushed or collapsing during the grinding process, ensuring the structural integrity and dimensional accuracy of the finished product, reducing the scrap rate and improving the finished product qualification rate.

[0045] Step S4: Pour abrasive particles and polishing liquid into the hexagonal roller.

[0046] In this step, the abrasive grains are selected according to the material and grinding requirements of the product 3 to be ground. For products 3 with high hardness, abrasive grains with high hardness such as silicon carbide can be selected. For products 3 with high precision requirements and softer materials, such as headless inserts and extension tubes, a conical resin abrasive of about 4mm in size can be selected for rough grinding, and a walnut shell abrasive of about 0.5mm in size can be selected for fine polishing. In actual operation, the abrasive grains and polishing fluid can be adjusted according to the different materials, sizes, and precision requirements of the thin-walled parts with stepped inner holes. By selecting appropriate abrasive grains and polishing fluids and controlling the grinding parameters, diverse production needs can be met, and the process adaptability and flexibility are strong.

[0047] Polishing fluid mainly serves to lubricate, cool, and assist in grinding, which can improve grinding efficiency and quality, and reduce the impact of heat generated during the grinding process on the product to be ground.

[0048] Step S5: Install the hexagonal roller into the centrifugal grinding equipment, start the centrifugal grinding equipment to drive the hexagonal roller to rotate, and grind the product 3 to be ground.

[0049] This step involves installing the hexagonal roller into the centrifugal grinding equipment and starting the equipment, which then drives the hexagonal roller to rotate at high speed. In actual assembly, first, the hexagonal roller is installed into the corresponding station of the centrifugal grinding equipment, then the station's fastening screws are tightened, the protective cover is closed, the rotation speed is set, and the equipment is started. Under centrifugal force, the abrasive particles and polishing fluid undergo intense friction and collision with the inner surface of the product to be ground (3), thus grinding the product (3). By controlling parameters such as the equipment's rotation speed and grinding time, the degree of grinding can be precisely controlled, ultimately achieving mirror-finish grinding of the inner hole of the product (3).

[0050] In actual operation, after grinding the product 3, the inner hole of the finished product achieves a dimensional accuracy of ±0.01, a concentricity of 0.01mm, and a surface roughness Ra≤0.1μm, and the product is free from deformation and the inner hole edge is free from collapse damage.

[0051] The process of this invention is mainly based on the principle of centrifugal grinding. It utilizes the centrifugal force generated by the high-speed rotation of the centrifugal grinding equipment to create relative motion and friction between the abrasive particles and polishing fluid inside the hexagonal drum and the product to be ground. Through this friction during grinding, microscopic protrusions and burrs on the inner surface of the product are removed, gradually achieving a smooth and even inner surface, ultimately achieving a mirror-finish grinding effect. Simultaneously, protective gaskets and cover plates serve as protective measures to ensure effective protection of the product during the grinding process, guaranteeing dimensional accuracy and finished product quality.

[0052] The grinding process of this invention can achieve mirror grinding of the stepped inner hole of thin-walled parts, effectively remove micro-defects on the inner hole surface, and make the surface roughness of the inner hole extremely low, which greatly improves the surface quality and precision of the finished product, meets the requirements of high-end finished products for the surface quality of the inner hole, and enhances the market competitiveness of the finished product.

[0053] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific implementation method of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, and improvements made within the scope of the spirit of this utility model should be included within the protection scope of this utility model.

Claims

1. A mirror-polishing fixture structure for the stepped inner hole of a thin-walled part, characterized in that, It includes a bracket (1) and a tooling base (2) fixed on the bracket (1). The tooling base (2) has an assembly cavity (4) for clamping the product to be ground (3). The product to be ground (3) is in clearance fit with the assembly cavity (4). The inner wall of the assembly cavity (4) is a stepped structure adapted to the shape of the product to be ground (3). It also includes an annular protective gasket (5) set at the clamping entrance of the assembly cavity (4) for protecting the end of the product (3) to be ground; It also includes a cover plate (6) set on the outside of the protective pad (5), and the cover plate (6) is detachably connected to the tooling base (2). The center of the cover plate (6) is also provided with a clearance opening corresponding to the inner hole of the product to be ground (3).

2. The mirror polishing fixture structure for the stepped inner hole of thin-walled parts according to claim 1, characterized in that, The number of tooling bases (2) is two or more.

3. The mirror polishing fixture structure for the stepped inner hole of a thin-walled part according to claim 1 or 2, characterized in that, The protective pad (5) includes an insert (501) and a close-fitting part (502), and is an overall "convex" shaped structure with an inner edge protruding. The insert (501) is the inner edge protruding part, which is used to insert into the inner hole of the product to be ground (3) and fit against the inner hole wall of the product to be ground (3). The close-fitting part (502) is disposed on the outer periphery of the insert (501) and is used to fit tightly against the end of the product to be ground (3).

4. The mirror polishing fixture structure for the stepped inner hole of thin-walled parts according to claim 3, characterized in that, The inner wall of the end of the product to be ground (3) that mates with the protective gasket (5) is also provided with a gasket embedding platform (7) that mates with the embedding part (501).

5. The mirror polishing fixture structure for stepped inner holes of thin-walled parts according to claim 1, 2, or 4, characterized in that, The product to be ground (3) and the assembly cavity (4) are IT7 grade clearance fit.

6. The mirror polishing fixture structure for the stepped inner hole of thin-walled parts according to claim 3, characterized in that, The product to be ground (3) and the assembly cavity (4) are IT7 grade clearance fit.

7. The mirror polishing fixture structure for stepped inner holes of thin-walled parts according to claim 1, 2, 4 or 6, characterized in that, The cover plate (6) includes a protective part (601) and a fixing part (602). The protective part (601) is used to cover the end of the protective pad (5) and protect the protective pad (5). The fixing part (602) is located on the outer periphery of the protective part (601) and is used to connect with the tooling base (2).

8. The mirror polishing fixture structure for the stepped inner hole of a thin-walled part according to claim 3, characterized in that, The cover plate (6) includes a protective part (601) and a fixing part (602). The protective part (601) is used to cover the end of the protective pad (5) and protect the protective pad (5). The fixing part (602) is located on the outer periphery of the protective part (601) and is used to connect with the tooling base (2).

9. The mirror polishing fixture structure for the stepped inner hole of a thin-walled part according to claim 5, characterized in that, The cover plate (6) includes a protective part (601) and a fixing part (602). The protective part (601) is used to cover the end of the protective pad (5) and protect the protective pad (5). The fixing part (602) is located on the outer periphery of the protective part (601) and is used to connect with the tooling base (2).

10. The mirror polishing fixture structure for stepped inner holes of thin-walled parts according to claims 1, 2, 4, 6, 8 or 9, characterized in that, The bracket (1) includes a support plate (101) and a connecting rod (102). There are two support plates (101), which are fixed at both ends of the connecting rod (102). The tooling base (2) is fixedly connected to the connecting rod (102).

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