Thin-wall part outer circle grinding clamp and thin-wall part

Abstract

The invention relates to a thin-wall part outer circle grinding clamp and a thin-wall part. The thin-wall part cylindrical grinding clamp comprises a positioning body, a clamping part, a clamping part and a clamping part, the positioning body is provided with a positioning end face, and an inner ring belt and an outer ring belt which are used for eliminating deformation springback are formed on the positioning end face; the pressing block is arranged on the positioning body in a sleeving mode and used for pressing the thin-wall part to be machined. The invention further provides a thin-wall part which is clamped by the thin-wall part outer circle grinding clamp and obtained through outer circle accurate grinding. The oil inlet valve solves the problems that an existing oil inlet valve for common rail oil injection is prone to deformation and low in precision in the outer circle accurate grinding process.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to a cylindrical grinding fixture for thin-walled parts and the thin-walled parts. Background Art

[0002] The marine common rail fuel injection pump is a precision manufacturing system, and its key performance indicators must be strictly controlled during the production process to ensure the reliability and consistency of the system. If the control of these key indicators exceeds the standard, it may cause the sliding pair to stick, the pump cannot work properly, and even lead to the serious consequence of failure of the entire fuel injection pump system.

[0003] The key to ensuring the quality and stability of the system is to use reliable fixtures to ensure the control of key performance indicators during the production process. This is not only a necessary measure to ensure the performance of the injection pump system, but also the basis for maintaining the reliability of the entire system.

[0004] As the core precision component of the common rail fuel injection pump, the main function of the fuel inlet valve is to control the entry of low-pressure fuel. It is a one-way valve that opens and closes by moving up and down. When the plunger moves downward, the fuel inlet valve opens and the low-pressure fuel flows into the plunger cavity; when the plunger moves upward, the fuel inlet valve closes, the inflow of fuel stops, and the fuel in the plunger cavity is prevented from flowing back, ensuring that the plunger cavity becomes a closed space, so that the fuel pressure can be established.

[0005] Since the oil inlet valve and the plunger sleeve together form a pair of high-precision sliding pairs, there are extremely high requirements for the roundness and cylindricity of the outer circle of the oil inlet valve; at the same time, the sealing surface formed by the large end face of the oil inlet valve and the lower end face of the oil outlet valve seat also needs to have high shape and position accuracy. Specific requirements include outer circle roundness of 0.001 mm, cylindricity of 0.002 mm, end face verticality of 0.01 mm, and center hole coaxiality of 0.02 mm.

[0006] This type of oil inlet valve is a high-hardness thin-walled part with a wall thickness ranging from 1 to 3 mm. When grinding the outer circle, clamping can easily cause the workpiece to deform, making it difficult to meet the precision of the outer circle and end face, which directly affects the performance of the assembly. Therefore, fine grinding of the outer circle of the oil inlet valve has become a major technical challenge in the manufacturing of the entire pump assembly. Summary of the invention

[0007] In view of this, the object of the present invention is to provide a thin-walled component outer cylindrical grinding fixture and a thin-walled component to solve the problems of easy deformation and low precision in the outer cylindrical fine grinding process of the existing common rail injection fuel inlet valve.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A cylindrical grinding fixture for thin-walled parts, comprising: A positioning body, wherein the positioning body has a positioning end surface, and the positioning end surface is formed with an inner ring belt and an outer ring belt for eliminating deformation rebound; The pressing block is sleeved on the positioning body and is used for pressing the thin-walled workpiece to be processed.

[0009] According to the above technical means, an inner ring belt and an outer ring belt for eliminating deformation rebound are formed on the positioning end face, so that the micron (μ) level micro deformation caused by grinding and compaction is offset by rebound after disassembly, thereby avoiding the deformation caused by the fine grinding process, improving the processing accuracy of thin-walled parts, and effectively solving the problems of easy deformation and low precision of the existing common rail injection oil inlet valve during the outer circle fine grinding process.

[0010] Preferably, the inner ring band and the outer ring band are protrusions formed circumferentially on the positioning end surface.

[0011] Preferably, the protrusion of the inner ring band is greater than the protrusion of the outer ring band.

[0012] By limiting the protrusion of the inner ring band to be greater than the protrusion of the outer ring band, the problem of micro-deformation of thin-walled parts during grinding can be eliminated in reverse.

[0013] Among them, since the workpiece is a thin-walled part and the grinding roundness requirement is high, it is extremely sensitive to the influence of grinding pressure deformation. After clamping and grinding, the too thin outer circle will produce a micro-deformation inward due to the squeezing of the grinding wheel. After the grinding is completed and the clamping is released, an outward rebound release will be generated. If there is no protrusion or the protrusion of the inner ring is lower than that of the outer ring, this rebound release cannot be eliminated or intensified. Therefore, the protrusion of the inner ring needs to be greater than that of the outer ring to eliminate the grinding micro-deformation in reverse.

[0014] Preferably, the protrusion L1 of the inner ring belt is 0.3 to 0.5 mm; And / or, the protrusion amount L2 of the outer ring belt is [L1-(0.0015~0.003)] mm.

[0015] Preferably, the width B1 of the inner ring belt is 2.5 to 3 mm; And / or, the width B2 of the outer ring belt is 3 to 4 mm; and / or, the outer edge diameter D1 of the inner ring belt is 1.8-1.9d, where d is the diameter of the centering section of the positioning body; And / or, the outer edge diameter D2 of the outer ring belt is 0.9-0.95D, wherein D is the outer diameter of the thin-walled part.

[0016] Preferably, the pressing block comprises an inner ring pressing block and an outer ring pressing block; The inner ring pressing block is sleeved on the positioning body and is used to press the inner ring of the thin-walled workpiece to be processed; The outer ring pressing block is sleeved on the positioning body and is used to press the outer ring of the thin-walled workpiece to be processed.

[0017] By separately setting an inner ring pressing block for pressing the inner ring of the thin-walled workpiece to be processed and an outer ring pressing block for pressing the outer ring of the thin-walled workpiece to be processed, the inner ring and outer ring of the thin-walled workpiece to be processed are pressed respectively, thereby ensuring the stability of the fixture in clamping the thin-walled workpiece to be processed and improving the processing accuracy; by separately setting the pressing blocks, the overall deformation of the thin-walled workpiece during the processing is effectively reduced; by separately setting the pressing blocks, the inner ring pressing block and the outer ring pressing block can be adjusted independently, effectively adapting to thin-walled workpieces of different sizes and shapes; the separated pressing blocks can press the inner and outer rings at the same time, effectively improving the processing speed; the separate design of the inner ring pressing block and the outer ring pressing block facilitates maintenance and replacement of damaged parts.

[0018] Preferably, the inner ring pressing block is fixed by a first nut.

[0019] Preferably, the outer ring pressing block is fixed by a second nut.

[0020] Preferably, the inner ring pressure block has first bosses arranged at intervals along its circumferential direction.

[0021] Preferably, the outer ring pressure block has second bosses arranged at intervals along its circumferential direction.

[0022] By cleverly arranging bosses at intervals to respectively press parts of the inner pressure veneer and the outer pressure veneer of the thin-walled workpiece to be processed, not only the problem of large deformation caused by overall pressing is avoided, but also the problem of unevenness in certain parts of the thin-walled workpiece to be processed, which reduces the overall pressing effect and affects the processing accuracy.

[0023] Preferably, the inner ring pressure block has three first bosses arranged at intervals along its circumferential direction.

[0024] Preferably, the inner ring pressure block has three first bosses arranged at intervals along its circumferential direction.

[0025] By cleverly arranging three first bosses and three second bosses at even intervals on the inner ring pressing block and the outer ring pressing block, the inner pressure surface and the outer pressure surface of the thin-walled part to be processed are respectively pressed, thereby ensuring uniform distribution of the pressing force and ensuring the processing accuracy of the thin-walled part to be processed.

[0026] Preferably, a positioning shaft is extended and formed on the positioning end surface; The positioning shaft comprises a centering section close to the root of the positioning shaft and a threaded section away from the root of the positioning shaft; The end of the positioning shaft is provided with a first center hole.

[0027] Preferably, a second center hole is provided on the end surface of the positioning body away from the positioning axis.

[0028] By further extending the positioning end face to form a positioning shaft, and cleverly dividing the positioning shaft into a centering section and a threaded section, the centering section is used to realize the center positioning of the thin-walled workpiece to be processed, so that the center positioning and end face positioning of the thin-walled workpiece to be processed are combined into one, which significantly improves the positioning accuracy, thereby ensuring the processing accuracy. At the same time, the threaded section provides convenience for the assembly of the nut.

[0029] The present invention also provides a thin-walled part, which is clamped by the thin-walled part outer cylindrical grinding fixture of the present invention and obtained by outer cylindrical fine grinding.

[0030] Beneficial effects of the present invention: The thin-walled part outer cylindrical grinding fixture of the present invention forms an inner ring belt and an outer ring belt on the positioning end face for eliminating deformation rebound, so that the micron (μ) level micro deformation caused by grinding and compaction is offset by rebound after disassembly, thereby avoiding the deformation caused in the fine grinding process, improving the processing accuracy of thin-walled parts, and effectively solving the problems of easy deformation and low precision of the existing common rail injection oil inlet valve in the outer cylindrical fine grinding process. The whole fixture system has the advantages of strong reliability, high control accuracy and simple structure, and has promotion and application value in the field of mechanical processing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the cylindrical grinding fixture for thin-walled parts; Figure 2 is a schematic diagram of the structure of the positioning body; Figure 3 It is a schematic diagram of the structure of the inner ring pressing block; Figure 4 It is the right side view of the inner ring pressing block; Figure 5 It is a schematic diagram of the structure of the outer ring pressing block; Figure 6 It is the right side view of the outer ring pressing block; Figure 7 is a schematic structural diagram of a first nut; Figure 8 It is a schematic diagram of the structure during grinding; Among them, 1-positioning body, 11-positioning end face, 12-inner ring belt, 13-outer ring belt, 14-positioning shaft, 141-centering section, 142-threaded section, 15-first center hole, 16-second center hole; 2-pressure block, 21-inner ring pressure block, 211-first boss, 212-guide hole, 22-outer ring pressure block, 221-second boss; 3-first nut; 4-second nut; 5-oil inlet valve to be processed; 6-driving clamp; 7-left center; 8-right center; 9-grinding wheel. DETAILED DESCRIPTION

[0032] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0033] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0034] The present invention intends to disclose a thin-walled component outer cylindrical grinding fixture and a thin-walled component, so as to solve the problems of easy deformation and low precision of the existing common rail fuel injection oil inlet valve during the outer cylindrical fine grinding process.

[0035] Among them, Figures 1 to 8 As shown, a thin-walled workpiece cylindrical grinding fixture comprises: A positioning body 1, the positioning body 1 having a positioning end surface 11, and the positioning end surface 11 is formed with an inner ring belt 12 and an outer ring belt 13 for eliminating deformation rebound; The pressing block 2 is mounted on the positioning body 1 and is used to press the thin-walled workpiece to be processed.

[0036] Among them, the positioning body, as the basis of the entire fixture, has a novel structural design. By arranging a new structure of an inner ring belt and an outer ring belt on the positioning end face of the positioning body, the micro-deformation caused by grinding and pressing is eliminated through deformation rebound.

[0037] In some embodiments, the inner annular band 12 and the outer annular band 13 are protrusions formed circumferentially on the positioning end surface 11 .

[0038] In some embodiments, the protrusion of the inner ring band 12 is greater than the protrusion of the outer ring band 13 .

[0039] In some embodiments, the protrusion L1 of the inner ring belt 12 is 0.3 to 0.5 mm; The protrusion amount L2 of the outer ring belt 13 is [L1-(0.0015~0.003)] mm.

[0040] In some embodiments, B1 of the inner ring band 12 is 2.5 to 3 mm; In some embodiments, the width B2 of the outer ring band 13 is 3 to 4 mm; In some embodiments, the outer edge diameter D1 of the inner ring belt 12 is 1.8 to 1.9d, where d is the diameter of the centering segment 141 of the positioning body 1; In some embodiments, the outer edge diameter D2 of the outer ring belt 13 is 0.9-0.95D, where D is the outer diameter of the thin-walled part.

[0041] Among them, the position of the ring belt and the protrusion of the ring belt are designed and fine-tuned according to the different wall thickness structures of the oil inlet valve and corrected through experiments.

[0042] In some embodiments, the pressing block 2 includes an inner ring pressing block 21 and an outer ring pressing block 22; The inner ring pressing block 21 is sleeved on the positioning body 1 and is used to press the inner ring of the thin-walled workpiece to be processed; The outer ring pressing block 22 is sleeved on the positioning body 1 and is used to press the outer ring of the thin-walled workpiece to be processed.

[0043] By separately setting an inner ring pressing block for pressing the inner ring of the thin-walled workpiece to be processed and an outer ring pressing block for pressing the outer ring of the thin-walled workpiece to be processed, the inner ring and outer ring of the thin-walled workpiece to be processed are pressed respectively, thereby ensuring the stability of the fixture in clamping the thin-walled workpiece to be processed and improving the processing accuracy; by separately setting the pressing blocks, the overall deformation of the thin-walled workpiece during the processing is effectively reduced; by separately setting the pressing blocks, the inner ring pressing block and the outer ring pressing block can be adjusted independently, effectively adapting to thin-walled workpieces of different sizes and shapes; the separated pressing blocks can press the inner and outer rings at the same time, effectively improving the processing speed; the separate design of the inner ring pressing block and the outer ring pressing block facilitates maintenance and replacement of damaged parts.

[0044] In some embodiments, the pressing block 2 includes an inner ring pressing block 21 and an outer ring pressing block 22; The inner ring pressing block 21 is sleeved on the positioning body 1 and is used to press the inner ring of the thin-walled workpiece to be processed; The outer ring pressing block 22 is sleeved on the positioning body 1 and is used to press the outer ring of the thin-walled workpiece to be processed.

[0045] Through the design of the inner and outer ring belts combined with the inner and outer ring pressure blocks, the synergistic effect is effectively guaranteed to ensure the positioning and clamping effect, and to ensure the precise and stable control of the outer circle fine grinding precision indicators.

[0046] Among them, the inner ring pressing block 21 is used for the inner ring pressing of the end face of the thin-walled workpiece to be processed, and its structural features are as follows: (1) The precision control design of the guide hole and the end face. On the one hand, the diameter D3 of the guide hole 212 of the inner ring pressing block 21 and the outer diameter d of the centering section 141 of the positioning body 1 are matched with a clearance of 0.01~0.015mm, that is, D3=[d+(0.01~0.015)]mm; on the other hand, the flatness of the end face of the inner ring pressing block 21 and the perpendicularity of the hole are optimized to meet the perpendicularity requirements of the guide hole. Through these two aspects, the accuracy and stability of the flat pressure produced by tightening the nut are ensured.

[0047] The outer ring pressing block 22 is used for pressing the outer ring of the end surface of the thin-walled workpiece to be processed, and its structural features are basically the same as those of the inner ring pressing block 21. Through the structural design, the deformation of the pressed outer ring is reduced.

[0048] In some embodiments, the inner ring pressing block 21 is fixed by a first nut 3; In some embodiments, the outer ring pressing block 22 is fixed by a second nut 4 .

[0049] Exemplarily, the first nut 3 and the second nut 4 are both flat compression nuts.

[0050] The flat pressing nut is a special nut. The end face of the flat pressing nut that contacts the inner ring pressing block 21 is provided with a countersunk hole 31, so that the fitting surface between the flat pressing nut and the inner ring pressing block 21 is a circle (not a whole surface), reducing the contact surface, forming a floating fit of the pressing surface, generating parallel thrust, reducing the pressing deformation, and thus reducing the pressing deformation of the thin-walled parts to be processed.

[0051] In some embodiments, the inner ring pressing block 21 is provided with first bosses 211 spaced apart along its circumferential direction; The outer ring pressing block 22 is provided with second bosses 221 spaced apart along its circumferential direction; By cleverly adopting the method of arranging bosses at intervals to press partial positions of the thin-walled workpiece to be processed, not only the problem of large deformation caused by overall pressing is avoided, but also the problem of unevenness in certain parts of the thin-walled workpiece to be processed, which reduces the overall pressing effect and affects the processing accuracy.

[0052] In some embodiments, the inner ring pressing block 21 has three first bosses 211 arranged at intervals along its circumferential direction; The inner ring pressing block 21 has three first bosses 211 arranged at intervals along the circumferential direction thereof.

[0053] The three-point pressing end face design is cleverly adopted to reduce the adverse effects caused by the uneven pressing surface. The boss structure design reduces the deformation of the pressing inner ring.

[0054] In some embodiments, a positioning shaft 14 is extended and formed on the positioning end surface 11; The positioning shaft 14 includes a centering section 141 close to the root of the positioning shaft 14 and a threaded section 142 away from the root of the positioning shaft 14 .

[0055] By further extending the positioning end face to form a positioning shaft, and cleverly dividing the positioning shaft into a centering section and a threaded section, the centering section is used to realize the center positioning of the thin-walled workpiece to be processed, so that the center positioning and end face positioning of the thin-walled workpiece to be processed are combined into one, which significantly improves the positioning accuracy, thereby ensuring the processing accuracy. At the same time, the threaded section provides convenience for the assembly of the nut.

[0056] Exemplarily, the end of the positioning shaft 14 is provided with a first central hole 15; A second center hole 16 is provided on the end surface of the positioning body 1 away from the positioning axis 14 .

[0057] Among them, the centering and end face positioning are integrated into the positioning body, so that the shape and position accuracy can be copied to the thin-walled parts to be processed, ensuring the assembly accuracy and processing progress.

[0058] Specifically: On the one hand, the locating body is designed and manufactured with a higher shape and position accuracy than the oil inlet valve; on the other hand, the outer diameter of the centering section of the locating body is manufactured in grades according to the tolerance of the centering hole of the oil inlet valve, and is selected according to the minimum clearance during use to ensure reliable positioning, thereby copying the shape and position accuracy of the locating body to the grinding part.

[0059] At the same time, a threaded section for assembling the nut of the inner ring pressure block and a threaded section for assembling the nut of the outer ring pressure block are formed on the positioning shaft, which effectively ensures the coaxiality control of the major diameter of the thread, facilitates the flat pressing and guiding of the inner ring pressure block and the outer ring pressure block, and effectively reduces the compression deformation of thin-walled parts.

[0060] Taking the oil inlet valve as an example, as a thin-walled part to be processed, during the actual use of the thin-walled part external cylindrical grinding fixture, first, the centering section 141 of the positioning body 1 and the centering hole of the oil inlet valve are selected according to the principle of minimum clearance, and then the oil inlet valve 5 to be processed is placed on the positioning end face 11 of the positioning body 1, and the inner ring of the oil inlet valve 5 to be processed is pressed by the inner ring pressure block 21, and locked by the flat nut, and the outer ring of the oil inlet valve 5 to be processed is pressed by the outer ring pressure block 22, and locked by the flat nut, and then the positioning body 1 is installed on the driving clamp 6, and the left center point 7 is installed in the second center hole 16 of the positioning body 1, and the right center point 8 is installed in the first center hole 15, and then the grinding wheel 9 is used to perform fine grinding on the outer circle of the oil inlet valve 5 to be processed, so as to achieve fine grinding of the outer circle of the thin-walled and easily deformable part.

[0061] The oil inlet valve obtained after fine grinding was tested and found to have an outer roundness of 0.00035-0.0006mm, a cylindricity of 0.0007-0.0012mm, a perpendicularity to the end face of 0.005-0.008mm, and a coaxiality of the center hole of 0.004-0.0065mm, which met the shape and position accuracy requirements. This proves that the fixture of the present invention can ensure the outer roundness position accuracy requirements of the oil inlet valve and improve the basic guarantee conditions for stable mass production of common rail injection pumps.

[0062] In some embodiments, there is also provided a method of clamping a thin-walled part by a cylindrical grinding fixture according to any of the above embodiments, and obtaining a thin-walled part by cylindrical fine grinding.

[0063] In summary, the thin-walled workpiece outer cylindrical grinding fixture of the present invention, firstly, forms an inner ring band and an outer ring band on the positioning end face for eliminating deformation rebound, so that the micron (μ) level micro deformation caused by grinding and pressing is offset by rebound after disassembly, thereby avoiding the deformation caused in the fine grinding process, improving the processing accuracy of thin-walled parts, and effectively solving the problems of easy deformation and low precision of the existing common rail injection oil inlet valve in the outer cylindrical fine grinding process; secondly, by integrating the centering and end face positioning of the positioning body, the shape and position accuracy of the positioning body is copied to the workpiece, which effectively ensures the assembly accuracy, thereby ensuring the processing accuracy; thirdly, by the unique design of separately setting the inner ring pressure block and the outer ring pressure block, the compression deformation of the thin-walled parts is reduced; the entire fixture system has the advantages of strong reliability, simple structure and high control accuracy, and has the value of promotion and application in the field of mechanical processing technology.

[0064] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A cylindrical grinding fixture for thin-walled parts, characterized in that: include: A positioning body (1), the positioning body (1) having a positioning end surface (11), the positioning end surface (11) being formed with an inner ring band (12) and an outer ring band (13) for eliminating deformation springback; The pressing block (2) is mounted on the positioning body (1) and is used to press the thin-walled workpiece to be processed.

2. The cylindrical grinding fixture for thin-walled parts according to claim 1, characterized in that: The inner annular band (12) and the outer annular band (13) are protrusions formed in an annular direction on the positioning end surface (11).

3. The cylindrical grinding fixture for thin-walled parts according to claim 2, characterized in that: The protrusion amount of the inner ring belt (12) is greater than the protrusion amount of the outer ring belt (13).

4. The cylindrical grinding fixture for thin-walled parts according to claim 3, characterized in that: The protrusion amount L1 of the inner ring belt (12) is 0.3 to 0.5 mm; And / or, the protrusion amount L2 of the outer ring belt (13) is [L1-(0.001~0.003)] mm.

5. The cylindrical grinding fixture for thin-walled parts according to claim 3, characterized in that: The width of the inner ring belt (12) is 2.5 to 3 mm; And / or, the width of the outer ring belt (13) is 3 to 4 mm; And / or, the outer edge diameter of the inner ring belt (12) is 1.4 to 1.5d, wherein d is the diameter of the centering section (141) of the positioning body (1); And / or, the outer edge diameter of the outer ring belt (13) is 0.9 to 0.95D, wherein D is the outer diameter of the thin-walled workpiece to be processed.

6. The cylindrical grinding fixture for thin-walled parts according to claim 1, characterized in that: The pressing block (2) comprises an inner ring pressing block (21) and an outer ring pressing block (22); The inner ring pressing block (21) is sleeved on the positioning body (1) and is used to press the inner ring of the thin-walled workpiece to be processed; The outer ring pressing block (22) is sleeved on the positioning body (1) and is used to press the outer ring of the thin-walled workpiece to be processed.

7. The cylindrical grinding fixture for thin-walled parts according to claim 6, characterized in that: The inner ring pressing block (21) is fixed by a first nut (3); And / or, the outer ring pressing block (22) is fixed by a second nut (4).

8. The cylindrical grinding fixture for thin-walled parts according to claim 6, characterized in that: The inner ring pressing blocks (21) are arranged at intervals along the circumferential direction of the thin-walled workpiece to be processed; And / or, the outer ring pressing blocks (22) are arranged at intervals along the circumferential direction of the thin-walled workpiece to be processed; And / or, the inner ring pressure block (21) is provided with first bosses (211) arranged at intervals along its circumferential direction; And / or, the outer ring pressure block (22) is provided with second bosses (221) arranged at intervals along its circumferential direction.

9. The cylindrical grinding fixture for thin-walled parts according to claim 1, characterized in that: A positioning shaft (14) is formed extending from the positioning end surface (11); The positioning shaft (14) comprises a centering section (141) close to the root of the positioning shaft (14) and a threaded section (142) away from the root of the positioning shaft (14); A first central hole (15) is provided at the end of the positioning shaft (14); And / or, a second center hole (16) is provided on the end surface of the positioning body (1) away from the positioning axis (14).

10. A thin-walled part, characterized in that: The thin-walled part is clamped by the cylindrical grinding fixture as described in any one of claims 1 to 9 and is obtained by cylindrical fine grinding.

Images