High-precision machining tool and method for special-shaped shell part with male end

Abstract

According to the high-precision machining tool and method for the special-shaped shell part with the male end, a boring and milling hole is formed in the plane B of the shell part, and a male end boss concentric with the boring and milling hole is formed; the flatness of the plane B is not greater than 0.015 mm, and the perpendicularity of the plane B and the plane A is not greater than 0.01 mm; the roughness of the plane A and the plane B does not exceed Ra1.6 mu m; the tool is composed of a positioning tool shaft, a gland, a spring gasket and a fine thread nut. The positioning tool shaft penetrates through the boring and milling hole to concentrically position and clamp the male end boss; a gland is arranged on the opposite inner side surface of the plane B; the spring gasket and the fine thread nut sequentially penetrate through the front end of the positioning tool shaft, and the fine thread nut is screwed with the threads at the front end of the positioning tool shaft, so that the shell part and the positioning tool shaft are concentrically pressed and fixedly connected into a whole. According to the machining method, through the tool design and the mode that turning machining replaces machining of a numerical control boring and milling machining center, the flatness and perpendicularity of the plane B of the special-shaped shell part with the male end meet the requirements of customers.

Description

Technical Field

[0001] The invention belongs to the technical field of tooling for processing workpieces on operating and transporting machine tools, and in particular relates to a high-precision processing tooling and method for a special-shaped shell part with an external stop. Background Art

[0002] In the harmonic reducer industry, such as Figure 1 The special-shaped housing part with an external stop is a structural part that supports the internal structure and installs the motor in the reducer. The conventional structural design is that the motor stop is a boss, and this boss and the reducer groove are matched with a small gap to ensure that the cumulative error after the motor shaft and the reducer are assembled is very small. Due to the particularity of the design of this reducer and the motor structure connected to it, an annular sealing groove needs to be designed at the motor stop, and there needs to be space to install the sealing ring at the connection with the reducer, that is, the structure where the motor and the reducer match needs to be designed as a groove hole, and the reducer housing is designed as a boss. This plane B has a large area and high requirements for flatness and form and position tolerance accuracy. The conventional method is to mill plane B and the boss on a CNC machining center machine. During milling, due to the uneven thickness of this plane B, the flatness and verticality cannot meet the requirements. In view of this purpose, in order to meet customer requirements, the following technical solution is proposed. Summary of the invention

[0003] The technical problem solved by the present invention is: to provide a high-precision machining tool and method for a special-shaped shell part with an external stop, by designing the tool and using turning to replace the machining method of a CNC boring and milling machining center, the flatness and verticality of the plane B of the special-shaped shell part with an external stop can meet the customer's requirements.

[0004] The technical solution adopted by the present invention is as follows: a high-precision machining tool for a special-shaped shell part with an external stop, wherein a plane B of the shell part is provided with a ФD4H7 boring and milling hole, and an external stop boss is provided concentrically with the boring and milling hole ФD4H7; the flatness of plane B is not greater than 0.015mm, and the perpendicularity of plane B to reference plane A is not greater than 0.01mm; the surface roughness of plane B and reference plane A does not exceed Ra1.6μm; the tool consists of a positioning tool shaft, a pressure cover, a spring gasket, and a fine-pitch nut; the middle part of the positioning tool shaft passes through the boring and milling hole and concentrically positions and clamps the external stop boss of the shell part; a pressure cover is provided on the inner side surface on the opposite side of plane B of the shell part, and the pressure cover is used to press the shell part, and the pressure cover passes through the front end of the positioning tool shaft to increase the pressing area of ​​the pressure cover to press the shell part; the spring gasket and the fine-pitch nut successively pass through the front end of the positioning tool shaft, and the fine-pitch nut is screwed with the front end thread of the positioning tool shaft to concentrically press and fasten the shell part and the positioning tool shaft as a whole.

[0005] In the above technical solution: the outer diameter of the outer stop boss completed by turning is ФD2h7, the perpendicularity between the outer stop boss and the A reference plane is not greater than 0.01mm, and the surface roughness of the outer stop boss does not exceed Ra1.6μm.

[0006] In the above technical solution, preferably: the positioning tool shaft is made of a modulation-treated alloy structural steel material.

[0007] In the above technical scheme, preferably: the positioning tooling shaft is composed of a ФD6h7 optical axis body I, a Ф33 optical axis body II, a ФD5h6 optical axis body III and a fine threaded portion, which are concentrically integrally formed and have successively decreasing diameters; the front end of the optical axis body II is used for concentrically and adapting to the external stop boss for positioning and clamping the shell parts; the transition between the rear end of the optical axis body II and the optical axis body I is used to provide an avoidance space when turning the external stop boss; the optical axis body III is used for concentrically and adapting to the ФD4H7 boring and milling hole for positioning and clamping the shell parts; the left end positioning surface of the axial length L5 formed concentrically by the aforementioned optical axis body III and the fine threaded portion meets the form and position tolerance requirements of plane B; the fine threaded portion is used for setting the pressure cover, spring gasket, and fine thread nut, wherein the fine thread nut is screwed to fit the fine threaded portion.

[0008] In the above technical scheme, preferably: the axial length of the optical axis shaft body III is smaller than the axial length of the ФD4H7 boring and milling hole of the shell part; the inner side surface of the pressure cover presses the opposite inner side surface of the shell part plane B, and the center through hole D4 of the pressure cover is gap-fitted with the fine thread part.

[0009] In the above technical solution, preferably: the fine pitch nut is a M8×1 fine pitch nut.

[0010] In the above technical solution, preferably: the surface roughness of the positioning tool shaft does not exceed Ra1.6μm, the circumferential runout tolerance is not greater than 0.015mmmm, and the coaxiality error between the axes does not exceed 0.015mmmm.

[0011] The present invention also seeks to protect a high-precision processing method for a special-shaped housing part with an external stop, comprising the following steps:

[0012] S1. Boring and milling of ФD4H7 boring and milling hole on plane B of shell part.

[0013] S2. Process the outer stop boss and plane B of the shell part, and reserve 0.015mm and 0.1mm machining allowances for the outer stop boss and plane B respectively.

[0014] S3. After clamping the shell part using any tool, turn the outer stop boss of plane B of the shell part so that plane B and the outer stop boss meet the process accuracy requirements.

[0015] In the above technical solution, the operation of clamping the shell parts with tooling in step S3 includes the following steps:

[0016] S301. Clamping of the tooling on the lathe: Install the positioning tooling shaft on the lathe, i.e. clamp the ФD6h7 optical axis body Ⅰ of the positioning tooling shaft.

[0017] S302. Alignment of the tooling on the lathe: Alignment makes sure that the outer circle of the ФD5h6 optical axis body III in the positioning tooling axis is within 0.005mm.

[0018] S303. Clamp the shell parts: Install the shell parts on the positioning fixture shaft and manually rotate the shell parts slowly to make the ФD4H7 boring and milling hole of the shell parts concentric with the ФD6h7 optical axis body Ⅰ of the positioning fixture shaft.

[0019] S303, clamp the shell parts: install the pressure cover, spring gasket and fine-pitch nut on the front end of the positioning tool shaft in sequence, and tighten the fine-pitch nut to complete the clamping of the shell parts on the tool.

[0020] In the above technical scheme, as a further improvement of the present invention: the positioning tool shaft can be reused. Every time a batch of shell parts are processed and a secondary clamping is needed, the left end face of the axial length L5 dimension composed of the optical axis shaft body III and the fine thread part concentrically formed in the positioning tool shaft can be turned to ensure the shape and position tolerance requirements of the positioning tool shaft clamping reference plane B and eliminate the wear of the end face during previous use.

[0021] The advantages of the present invention compared with the prior art are:

[0022] 1. The present invention replaces the boring and milling process with turning pin processing to ensure that the high precision and flatness of the external stop boss meet customer requirements. The technical solution is stable and has good processability in mass production of parts.

[0023] 2. The tooling parts of the present invention are simplified in number, the assembly operation is simple and convenient, the processing positioning is accurate, the M8 fine thread has a good self-locking and anti-loosening effect, the alloy structural steel material has excellent mechanical properties, the processing qualification rate is effectively improved, the tooling can be used repeatedly, and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of a housing part with an outer stop and a special shape related to the present invention;

[0025] Figure 2 for Figure 1 The AA process requires a cross-sectional view;

[0026] Figure 3 for Figure 1 Three-dimensional stereogram of the shell parts;

[0027] Figure 4For the tooling clamping of the present invention Figure 1 Schematic diagram of the assembly structure of the shell parts;

[0028] Figure 5 For the present invention Figure 4 The structure and dimension process diagram of the center positioning fixture shaft;

[0029] Figure 6 For the present invention Figure 4 Schematic diagram of the middle gland structure;

[0030] Figure 7 For the present invention Figure 4 Front view of medium fine pitch nut;

[0031] Figure 8 for Figure 7 Side view of

[0032] In the figure: 1-housing parts, 2-positioning tooling shaft, 201-optical axis shaft body I, 202-optical axis shaft body II, 203-optical axis shaft body III, 204-fine threaded part, 3-pressure cover, 4-spring gasket, 5-fine thread nut. DETAILED DESCRIPTION

[0033] The following will be combined with the attached embodiment of the present invention Figure 1-8 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention claims a high-precision processing tool for a special-shaped shell part with an external stop, (such as Figure 1-3 As shown in the figure, regarding the geometric tolerance requirements of the housing part 1, the plane B of the housing part 1 is provided with a ФD4H7 boring and milling hole. It should be noted that ФD4H7 should be understood as a diameter of D4 and a tolerance grade of H7. An external stop boss is provided concentrically with the boring and milling hole ФD4H7; the flatness of plane B is not greater than 0.015mm, and the perpendicularity between plane B and reference plane A is not greater than 0.01mm; the surface roughness of plane B and reference plane A does not exceed Ra1.6μm. That is, the present invention is applicable to the processing of special-shaped housing parts with external stops that meet the above-mentioned process requirements.

[0035] Due to the high-precision structural characteristics of the outer stop boss of the housing part 1, this position is the motor mounting surface, which has the characteristics of high dimensional accuracy and strict form and position tolerance. The commonly used processing method is milling. The milling of the structure here is prone to deformation and cannot meet the requirements. Therefore, the following tooling design is proposed:

[0036] (like Figure 4-5The tooling is composed of a positioning tooling shaft 2, a pressure cover 3, a spring washer 4, and a fine-pitch nut 5. The tooling structure of the present invention has a simplified number of components, simplified operation, and reduced costs.

[0037] Moreover, the middle part of the positioning tool shaft 2 passes through the boring and milling hole and is concentrically positioned to clamp the outer stop boss of the shell part 1. A pressure cover 3 is provided on the inner side opposite to the plane B of the shell part 1. The pressure cover 3 is used to press the shell part 1, and the pressure cover 3 passes through the front end of the positioning tool shaft 2 to increase the pressing area of ​​the pressure cover 3 pressing the shell part 1, thereby improving the firmness and reliability of the pressing. The spring gasket 4 and the fine-pitch nut 5 successively pass through the front end of the positioning tool shaft 2, and the fine-pitch nut 5 is screwed into the front end thread of the positioning tool shaft 2 to concentrically press and fix the shell part 1 and the positioning tool shaft 2 into one body, with accurate positioning and easy assembly. Therefore, the tool design structure of the present invention is simple, the loading and unloading positioning is convenient to use, the processability is good, the processing qualification rate is improved, the cost is reduced, and the tool can be used repeatedly.

[0038] In the above embodiment, preferably: the outer diameter of the outer stop boss completed by turning is ФD2h7, that is, the outer diameter of the outer stop boss is D2, and the tolerance zone is h7. Figure 2 (As shown in the figure), the perpendicularity between the outer stop boss and the A reference plane shall not exceed 0.01mm, and the surface roughness of the outer stop boss shall not exceed Ra1.6μm.

[0039] In the above embodiment, preferably, the positioning fixture shaft 2 is made of a conditioned alloy structural steel. Since alloy structural steel contains a certain amount of alloy elements, its microstructure is usually more complex than that of carbon steel. After appropriate heat treatment, the alloy structural steel can obtain a uniform troostite, bainite or extremely fine pearlite structure, thereby having excellent mechanical properties. Therefore, the positioning fixture shaft 2 has a certain hardness and is wear-resistant for repeated use.

[0040] In the above embodiment, preferably, the positioning fixture shaft 2 is composed of a ØD6h7 optical axis body I 201, a Ø33 optical axis body II 202, a ØD5h6 optical axis body III 203 and a fine thread portion 204, which are coaxially formed and have successively decreasing diameters. That is, the diameter of the optical axis body I 201 is D6, and the tolerance zone is h7; the diameter of the optical axis body II 202 is 33 mm; the diameter of the optical axis body III 203 is D5, and the tolerance zone is h6.

[0041] The positioning tool shaft 2 of the present invention is integrally formed, which reduces the detailed processing and splicing of multiple parts, saves production time, improves overall production efficiency, and reduces production costs. The design of the optical axis shaft body with a diameter that decreases sequentially makes it easier to achieve precise positioning of the tool shaft during assembly, reduces assembly errors, and improves the accuracy and consistency of the product. The design of sequentially decreasing diameters makes the assembly process smoother, reduces resistance and friction during assembly, increases assembly speed, and reduces assembly costs. Although the diameter gradually decreases, the overall structure remains compact and sturdy. It can withstand large loads and impacts, which improves the durability of the product. The fine thread has a small pitch, which makes it have higher accuracy and stability.

[0042] The front end of the optical axis body II 202 is used for concentric and adapting positioning and clamping the outer stop boss of the housing part 1. The transition between the rear end of the optical axis body II 202 and the optical axis body I 201 is used to provide an escape space for turning the outer stop boss.

[0043] (like Figure 2 , Figure 4 , Figure 5 As shown in the figure, the optical axis shaft body III203 is used to be concentric and adaptable to the positioning and clamping of the ФD4H7 boring and milling hole (D4=D5) of the shell part 1. This fit serves as a positioning reference for the fit between the tooling and the shell part 1. A small gap is adapted to ensure centering during assembly and to ensure that the tooling and the shell part 1 are coaxial.

[0044] The left end positioning surface of the axial length L5 formed concentrically by the aforementioned optical axis shaft body III 203 and the fine pitch thread portion 204 meets the form and position tolerance requirements of plane B (the form and position tolerance requirements are described above) to ensure that this end face of the tooling is firmly attached to the mating end face of the shell part 1, to ensure that this position does not move, and to improve the positioning accuracy.

[0045] The fine thread portion 204 is used to fit the gland 3, the spring washer 4, and the fine nut 5, wherein the fine nut 5 is screwed to fit the fine thread portion 204. This ensures that the tooling and the housing part 1 are pressed tightly to avoid displacement of the housing part 1 due to machining and cutting during machining.

[0046] (like Figure 7 , 8(As shown) In the above embodiment, preferably: the fine pitch nut 5 is an M8×1 fine pitch nut. The internal thread diameter of the M8×1 fine pitch nut is 8 mm and the pitch is 1 mm. This specification allows the nut to have a smaller volume and weight while maintaining sufficient connection strength, and is suitable for occasions with strict requirements on space and weight. The fine pitch nut is characterized by its smaller pitch, which makes the nut have a better anti-loosening effect after being locked or back-locked. In addition, the fine pitch design also enables the nut to provide a more uniform stress distribution during the connection process, thereby improving the reliability and durability of the connection. Since the fine pitch nut has a smaller helix angle, when the nut is locked or back-locked, its self-locking and anti-loosening effects are better than those of the coarse pitch nut. This makes the M8×1 fine pitch nut perform well in the connection of high-speed rotating or moving parts, and can effectively prevent loosening caused by vibration or impact.

[0047] In the above embodiment, preferably: the axial length of the optical axis shaft body III203 is less than the axial length of the ФD4H7 boring and milling hole of the housing part 1; the inner side surface of the pressure cover 3 presses the inner side surface on the opposite side of the plane B of the housing part 1, (combined with Figure 6 As shown), the central through hole D4 of the gland 3 is fitted with the fine thread portion 204 to facilitate quick assembly of the gland 3.

[0048] Preferred: The surface roughness of the positioning fixture shaft 1 does not exceed Ra1.6μm, the circumferential runout tolerance is not greater than 0.015mmmm, and the coaxiality error between the axes does not exceed 0.015mm. The smaller the surface roughness, the smaller the fit clearance between the parts, thereby improving the fit accuracy. It helps to reduce errors and deviations during assembly and ensure a tight fit between parts. A smooth surface can reduce friction and wear and extend the service life of parts. The smaller the circumferential runout tolerance, the better the stability of the parts during rotation. It helps to reduce vibration and noise and improve the operating efficiency of the machine. The smaller the coaxiality error, the higher the assembly accuracy between the axes, which helps to ensure the overall performance and stability of the mechanical system. A shaft system with good coaxiality can reduce vibration and noise and improve the smooth operation of the machine.

[0049] The present invention also seeks to protect a high-precision processing method for a special-shaped housing part with an external stop, comprising the following steps:

[0050] Step S1, boring and milling a ФD4H7 boring and milling hole on plane B of the housing part 1.

[0051] Step S2, boring and milling the outer stop boss and plane B of the housing part 1, and leaving machining allowances of 0.015 mm and 0.1 mm for the outer stop boss and plane B respectively.

[0052] Step S3: After clamping the shell part 1 using any of the tools described above, turning the outer stop boss of plane B of the shell part 1 so that the plane B and the outer stop boss meet the process accuracy requirements.

[0053] The design principle of the method of the present invention is as follows: first, the outer stop boss and plane B are roughly milled on a machining center machine tool, and appropriate reservations are made for the outer stop boss and plane B respectively to allow the parts to deform as much as possible; secondly, the shell part 1 is clamped on a lathe through the designed tooling to complete the deformation repair of the shell part 1 and the fine processing required by the process.

[0054] In the above embodiment, further: the operation of clamping the housing part 1 with a tool in step S3 includes the following steps:

[0055] S301. Clamping of the tooling on the lathe: Install the positioning tooling shaft 2 on the lathe, i.e. clamp the ФD6h7 optical axis body Ⅰ201 of the positioning tooling shaft 2.

[0056] S302. Alignment of the tooling on the lathe: Alignment makes the outer circle of the ФD5h6 optical axis body III203 in the positioning tooling axis 2 within 0.005mm.

[0057] S303, clamping the shell parts: install the shell part 1 on the positioning fixture shaft 2 and manually rotate the shell part 1 slowly to make the ФD4H7 boring and milling hole of the shell part 1 concentric with the ФD6h7 optical axis body Ⅰ201 of the positioning fixture shaft 2.

[0058] S303, clamping the housing part: install the pressure cover 3, the spring washer 4, and the fine-thread nut 5 in sequence on the front end of the positioning tool shaft 2, and tighten the fine-thread nut 5 to complete the clamping of the housing part 1 on the tool.

[0059] In the above embodiment, further: the positioning tool shaft 2 is reusable, and each time a batch of shell parts 1 is processed and needs to be used for secondary clamping again, the left end face of the axial length L5 dimension composed of the optical axis shaft body III 203 and the fine threaded portion 204 in the positioning tool shaft 2 can be turned to ensure the shape and position tolerance requirements of the clamping reference plane B of the positioning tool shaft 2, thereby eliminating the wear of the end face during previous use.

[0060] From the above description, it can be found that the present invention replaces the boring and milling process with turning pin processing, ensuring the high precision and flatness of the external stop boss to meet customer requirements, the technical solution is stable, and it has good processability in mass production of parts.

[0061] The tooling parts of the present invention are simplified in number, the assembly operation is simple and convenient, the processing positioning is accurate, the M8 fine pitch thread has a good self-locking and anti-loosening effect, the alloy structural steel material has excellent mechanical properties, the processing qualification rate is effectively improved, the tooling can be used repeatedly, and the cost is reduced.

[0062] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification and equivalent replacement made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A high-precision machining tool for special-shaped shell parts with external stoppers, characterized in that: The shell part (1) has a boring and milling hole of ØD4H7 on plane B, and an external stop boss is formed concentrically with the boring and milling hole of ØD4H7; the flatness of plane B is not greater than 0.015 mm, and the perpendicularity between plane B and reference plane A is not greater than 0.01 mm; the surface roughness of plane B and reference plane A does not exceed Ra1.6 μm; The tooling is composed of a positioning tooling shaft (2), a pressure cover (3), a spring washer (4), and a fine-pitch nut (5); the middle part of the positioning tooling shaft (2) passes through the boring and milling hole and is concentrically positioned to clamp the outer stop boss of the shell part (1); a pressure cover (3) is provided on the inner side surface opposite to the plane B of the shell part (1), and the pressure cover (3) is used to press the shell part (1), and the pressure cover (3) passes through the front end of the positioning tooling shaft (2) to increase the pressing area of ​​the pressure cover (3) pressing the shell part (1); the spring washer (4) and the fine-pitch nut (5) successively pass through the front end of the positioning tooling shaft (2), and the fine-pitch nut (5) is screwed into the front end thread of the positioning tooling shaft (2) so as to concentrically press and fix the shell part (1) and the positioning tooling shaft (2) into one.

2. The tooling according to claim 1, characterized in that: The outer diameter of the outer stop boss completed by turning is ФD2h7, the perpendicularity between the outer stop boss and the A reference plane is not greater than 0.01mm, and the surface roughness of the outer stop boss is not greater than Ra1.6μm.

3. The tooling according to claim 1, characterized in that: The positioning fixture shaft (2) is made of a modulated alloy structural steel material.

4. The tooling according to claim 1 or 3, characterized in that: The positioning tool shaft (2) is composed of a ØD6h7 optical axis body I (201), a Ø33 optical axis body II (202), a ØD5h6 optical axis body III (203) and a fine threaded portion (204) which are coaxially integrally formed and have successively decreasing diameters; the front end of the optical axis body II (202) is used for concentrically fitting and locating an outer stop boss of the housing part (1); the transition between the rear end of the optical axis body II (202) and the optical axis body I (201) is used for turning the outer stop boss The boss provides an avoidance space; the optical axis shaft body III (203) is used for concentrically and adapting to the ФD4H7 boring and milling hole of the housing part (1); the left end positioning surface of the axial length L5 formed by the concentricity of the optical axis shaft body III (203) and the fine pitch thread part (204) meets the form and position tolerance requirements of plane B; the fine pitch thread part (204) is used for fitting the pressure cover (3), the spring gasket (4), and the fine pitch nut (5), wherein the fine pitch nut (5) is screwed to fit the fine pitch thread part (204).

5. The tooling according to claim 4, characterized in that: The axial length of the optical axis shaft body III (203) is smaller than the axial length of the ФD4H7 boring and milling hole of the housing part (1); the inner side surface of the pressure cover (3) presses the inner side surface opposite to the plane B of the housing part (1), and the center through hole D4 of the pressure cover (3) is gap-fitted with the fine threaded portion (204).

6. The tooling according to claim 5, characterized in that: The fine pitch nut (5) is an M8×1 fine pitch nut.

7. The tooling according to claim 4, characterized in that: The surface roughness of the positioning fixture shaft (2) does not exceed Ra1.6μm, the circumferential runout tolerance is not greater than 0.015mm, and the coaxiality error between the shafts does not exceed 0.015mmmm.

8. A high-precision processing method for a special-shaped housing part with an external stop, characterized in that: The steps include: S1. Boring and milling of the housing part (1) Boring and milling of a ØD4H7 hole on plane B; S2, processing the outer stop boss and plane B of the housing part (1), and leaving a processing allowance of 0.015 mm and 0.1 mm for the outer stop boss and plane B respectively; S3. After clamping the shell part (1) using the tooling as described in any one of claims 1 to 7, the outer stop boss of plane B of the shell part (1) is turned so that plane B and the outer stop boss meet the process accuracy requirements.

9. The method according to claim 8, characterized in that: The operation of clamping the housing part (1) with a tool in step S3 comprises the following steps: S301, clamping the tooling on the lathe: installing the positioning tooling shaft (2) on the lathe, i.e. clamping the ФD6h7 optical axis shaft body Ⅰ (201) of the positioning tooling shaft (2); S302, alignment of the tooling on the lathe: alignment so that the outer circle of the ØD5h6 optical axis shaft body III (203) in the positioning tooling shaft (2) is within 0.005 mm; S303, clamping the housing part: mounting the housing part (1) on the positioning fixture shaft (2) and manually rotating the housing part (1) slowly, so that the ФD4H7 boring and milling hole of the housing part (1) is concentric with the ФD6h7 optical axis body Ⅰ (201) of the positioning fixture shaft (2); S303, clamping the housing part: install the pressure cover (3), spring washer (4), and fine-thread nut (5) on the front end of the positioning fixture shaft (2) in sequence, and tighten the fine-thread nut (5) to complete the clamping of the housing part (1) on the fixture.

10. The method according to claim 8 or 9, characterized in that: The positioning fixture shaft (2) is reusable. When a batch of shell parts (1) is processed and needs to be clamped again for a second time, the left end face of the axial length L5 dimension formed by the concentricity of the optical axis shaft body III (203) and the fine thread part (204) in the positioning fixture shaft (2) can be turned to ensure the shape and position tolerance requirements of the clamping reference plane B of the positioning fixture shaft (2) and eliminate the wear of the end face during previous use.

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