High-precision machining method for inner spherical cavity

Abstract

A high-precision machining method for an inner ball cavity is characterized in that a to-be-machined radius-passing spherical surface is arranged on the inner surface of the inner ball cavity, a window is formed in the side wall of the inner ball cavity, and the method comprises the steps that an inner ball cavity grinding tool is assembled, specifically, a fixing base and a plurality of grinding heads are arranged in the inner ball cavity through the window, and a grinding spherical surface matched with the to-be-machined radius-passing spherical surface is formed by a grinding cambered surface on each grinding head; the central through hole of the fixed seat is used for mounting the expansion shaft; adjusting the size of the grinding spherical surface: adjusting the axial relative position of the expansion shaft and the central through hole, and changing the relative position between the plurality of mounting parts for mounting the grinding heads, so that the grinding spherical surface is enlarged and is attached to the radius-passing spherical surface to be processed; grinding processing: taking the to-be-processed radius-passing spherical surface as a reference and guidance, enabling a grinding head to rotate and swing relative to an inner spherical cavity, and grinding the to-be-processed radius-passing spherical surface by a grinding spherical surface; and the grinding spherical surface size can be adjusted until the current spherical surface size meets the target spherical surface requirement, and high-precision integrated forming of the inner spherical surface is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of precision machining, in particular to a high-precision machining method for an inner spherical cavity. Background Art

[0002] At present, the precision of inner spherical surface machining is low, especially for the over-radius spherical surface (the spherical surface spans two mutually perpendicular central sections of the sphere). The machining tool needs to be inserted into the spherical cavity, and then gradually machine the inner wall surface of the spherical cavity to obtain multiple partial spherical surfaces to form a complete spherical surface. For example, the gooseneck knife is manually inserted into the cavity in an arc, and then the relative position of the tool and the workpiece is adjusted to machine the entire spherical surface.

[0003] For parts with an inner spherical cavity structure, different requirements are placed on the spherical surface accuracy of the inner spherical cavity depending on the type and purpose of the parts. For parts requiring high-precision inner spherical surface processing, such as standard samples used in inner spherical cavity measuring equipment for automobile differential housings, the above processing method cannot produce a spherical surface that meets the requirements due to the long tool length and easy tool vibration. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a high-precision processing method for the inner spherical cavity, thereby achieving high-precision one-piece molding of the inner spherical surface.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A high-precision processing method for an inner spherical cavity, wherein the inner surface of the inner spherical cavity is provided with a spherical surface with a radius to be processed, and a window is provided on the side wall of the inner spherical cavity, and the processing method comprises the following steps:

[0007] Inner spherical cavity grinding tool assembly: a fixed seat and a plurality of grinding heads are placed in the inner spherical cavity through a window, each grinding head is provided with a grinding arc surface, and the plurality of grinding heads are detachably connected to a plurality of mounting parts on the fixed seat one by one, the plurality of grinding arc surfaces form a grinding spherical surface matching the spherical surface with a radius to be processed, and the plurality of mounting parts are distributed along the circumferential direction with the central through hole of the fixed seat as the center, and the central through hole is used to install the expansion shaft;

[0008] Adjusting the size of the grinding spherical surface: the expansion shaft is installed in the central through hole, and the axial relative position of the expansion shaft and the central through hole is adjusted, thereby changing the relative positions between the multiple mounting parts, so that the grinding spherical surface is enlarged and fits with the spherical surface with a radius to be processed;

[0009] Grinding: After the grinding spherical surface is fitted with the spherical surface with the radius to be processed, the spherical surface with the radius to be processed is used as a reference and guide to rotate and swing the grinding head relative to the inner spherical cavity, and the grinding spherical surface grinds the spherical surface with the radius to be processed;

[0010] After one grinding process, the current spherical surface size is confirmed. If the target spherical surface requirements are met, the grinding process is completed. If the target spherical surface requirements are not met, the grinding spherical surface size adjustment step is performed and the grinding process is performed again until the current spherical surface size meets the target spherical surface requirements.

[0011] As a further improvement of the above technical solution:

[0012] In the assembly steps of the inner spherical cavity grinding tool, first, multiple grinding heads are placed into the inner spherical cavity through the window, so that the multiple grinding heads are distributed in the circumferential direction with the radius spherical surface to be processed as the base surface, and then the fixed seat is placed between the multiple grinding heads through the window, and the grinding heads are detachably connected to the mounting part on the fixed seat.

[0013] The grinding head is provided with a perforation, the window includes an axial opening and a side opening, and the expansion shaft corresponds to the axial opening;

[0014] When assembling the fixing seat, the fixing seat is placed between the multiple grinding heads through the axial opening, the fasteners are installed in the through holes on the grinding heads through the side openings, and the grinding heads are detachably connected to the mounting portion through the fasteners.

[0015] A pair of adjacent mounting parts among the plurality of mounting parts are separated by an open gap, and the remaining adjacent mounting parts are elastically connected by elastic arms and are provided with deformation gaps that penetrate through both ends of the fixing seat, and the plurality of mounting parts and the elastic arms enclose the central through hole;

[0016] When adjusting the axial relative position of the expansion shaft and the center through hole, external force is applied to the fixing seat to cause elastic deformation of the elastic arm, increase the opening gap, reduce the deformation gap, increase the diameter of the center through hole, increase the grinding spherical surface and fit with the spherical surface of the radius to be processed.

[0017] The central through hole is a tapered circular hole, and the expansion shaft is provided with a tapered axial surface matching the central through hole. A limit assembly is installed at one end of the expansion shaft, and the limit assembly applies a tensile force to the expansion shaft and a pressure to the end surface of the fixing seat. The tensile force and the pressure are in opposite directions. After the tapered axial surface moves relative to the central through hole, the elastic arm undergoes elastic deformation and the diameter of the central through hole increases.

[0018] The limiting assembly includes a bolt and a gasket. A threaded hole is provided at the end of the tightening shaft on the small end of the tapered shaft surface. The bolt is threadedly connected to the threaded hole. The gasket contacts the end surface of the fixing seat. The pressure of the head of the bolt on the gasket is changed by changing the installation depth of the bolt in the threaded hole, thereby causing elastic deformation of the elastic arm.

[0019] The taper of the tapered axial surface is 1:20-1:30.

[0020] A weakening hole is provided between the elastic arm and the deformation gap. The weakening hole is consistent with the central through hole in length and direction, and the weakening hole is communicated with the deformation gap.

[0021] The process of placing the fixing seat between the plurality of grinding heads through the window includes the following steps:

[0022] The relative position of the grinding head and the mounting portion in a direction perpendicular to the axis of the central through hole is limited by simultaneously engaging the first positioning groove on the grinding head and the second positioning groove on the mounting portion with the positioning pin from both sides of the positioning pin;

[0023] By matching the boss at one end of the mounting portion with the groove at one end of the grinding head, the relative positions of the mounting portion and the grinding head in the axial direction of the central through hole are limited, and multiple grinding arc surfaces form a grinding spherical surface that matches the radius spherical surface to be processed.

[0024] In the grinding process, the grinding head is rotated and swung relative to the inner ball cavity by manually rotating and swung the expansion shaft regularly.

[0025] The beneficial effects of the present invention are as follows:

[0026] The present invention has a compact and reasonable structure and is easy to operate. The split-design grinding head enters the inner spherical cavity through a window on the side wall of the inner spherical cavity, and is assembled with a fixed seat in the inner spherical cavity to form a grinding spherical surface. After the grinding spherical surface is adjusted to fit the spherical surface with a radius to be processed, grinding is performed with the spherical surface with a radius to be processed as a reference and guide, thereby realizing high-precision one-piece molding of the inner spherical surface.

[0027] At the same time, the present invention also has the following advantages:

[0028] (1) By providing an elastically deformable fixing seat and expanding the central through hole of the fixing seat through a tapered shaft hole structure, the relative position of the grinding head installed on the fixing seat mounting portion is changed by increasing the diameter of the central through hole, thereby increasing the grinding spherical surface.

[0029] (2) The structure of the positioning pin and the two positioning grooves, and the structure of the boss and the groove realize the lateral and longitudinal positioning of the grinding head and the mounting part, which is convenient for the positioning and assembly operation of the auxiliary grinding head and the fixing seat inside the inner ball cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a schematic diagram of the state of a high-precision processing method for a spherical cavity according to an embodiment of the present invention.

[0031] Figure 2 It is a state schematic diagram of a high-precision processing method for a spherical cavity according to another embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the assembly process of the inner ball cavity grinding tool of the present invention.

[0033] Figure 4 It is a schematic structural diagram of the inner ball cavity grinding tool of the present invention.

[0034] Figure 5 It is a top view of the inner ball cavity grinding tool of the present invention.

[0035] Figure 6 It is a front view of the inner ball cavity grinding tool of the present invention.

[0036] Figure 7 It is an exploded view of the inner ball cavity grinding tool of the present invention.

[0037] Figure 8 It is a schematic structural diagram of the grinding head of the present invention.

[0038] Fig. 9 It is a structural schematic diagram of the fixing seat of the present invention.

[0039] in:

[0040] 1. Grinding head; 10. Grinding arc surface; 11. Perforation; 12. First positioning groove; 13. Groove;

[0041] 2. Fixed seat;

[0042] 21. mounting portion; 211. second positioning groove; 212. positioning pin;

[0043] 22. elastic arm; 221. deformation gap; 222. weakening hole;

[0044] 23. Center through hole; 24. Opening gap; 25. Boss;

[0045] 3. Limiting assembly; 31. Bolt; 32. Gasket;

[0046] 4. Expansion shaft; 41. Conical shaft surface;

[0047] 5. Workpiece body; 50. Discontinuous spherical surface;

[0048] 6. Window; 61. Side opening; 62. Axial opening. DETAILED DESCRIPTION

[0049] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0050] Embodiment 1:

[0051] like Figure 1-Figure 6 As shown, a high-precision processing method for an inner spherical cavity according to an embodiment of the present application, the inner surface of the inner spherical cavity is provided with a spherical surface with a radius to be processed, and a window 6 is provided on the side wall of the inner spherical cavity. The processing method includes the following steps:

[0052] Inner spherical cavity grinding tool assembly: the fixed seat 2 and the plurality of grinding heads 1 are placed in the inner spherical cavity through the window 6, each grinding head 1 is provided with a grinding arc surface 10, the plurality of grinding heads 1 are detachably connected to the plurality of mounting parts 21 on the fixed seat 2 one by one, the plurality of grinding arc surfaces 10 form a grinding spherical surface matching the spherical surface with a radius to be processed, the plurality of mounting parts 21 are distributed along the circumferential direction with the central through hole 23 of the fixed seat 2 as the center, and the central through hole 23 is used to mount the expansion shaft 4;

[0053] Adjust the size of the grinding spherical surface: the expansion shaft 4 is installed in the central through hole 23, and the axial relative position of the expansion shaft 4 and the central through hole 23 is adjusted, thereby changing the relative positions between the multiple mounting parts 21, so that the grinding spherical surface is enlarged and fits with the spherical surface with a radius to be processed;

[0054] Grinding: After the grinding spherical surface is fitted with the spherical surface with the radius to be processed, the spherical surface with the radius to be processed is used as a reference and guide to rotate and swing the grinding head 1 relative to the inner spherical cavity, and the grinding spherical surface grinds the spherical surface with the radius to be processed. Specifically, in the grinding process, the grinding head 1 can be rotated and swung relative to the inner spherical cavity by manually rotating and swinging the expansion shaft 4 regularly;

[0055] After a grinding process, the current spherical surface size is confirmed. If the target spherical surface requirements are met, the grinding process is completed. If the target spherical surface requirements are not met, the grinding spherical surface size adjustment step is performed and the grinding process is performed again until the current spherical surface size reaches the target spherical surface requirements. Before confirming the current spherical surface size, the fixed seat 2 and the grinding head 1 can be disconnected and removed from the inner ball cavity.

[0056] The inner spherical cavity is located on the workpiece body 5, and the cross-radius spherical surface is a spherical surface that spans two mutually perpendicular central sections of the sphere. The cross-radius spherical surface to be processed in this embodiment can be a relatively continuous spherical surface, such as Figure 1 It can also be a plurality of discontinuous spherical surfaces 50, all of which are located on a sphere, such as Figure 2 The inner ball cavity grinding tool comprises a grinding head 1, a fixing seat 2 and a tightening shaft 4.

[0057] The initial state of the spherical surface to be processed with a radius is processed by turning, and a grinding allowance of 0.02mm-0.05mm is retained relative to the target spherical surface size. For example, when the target spherical surface diameter is 178mm, it is first processed to 177.97mm by turning, which can be obtained by the gooseneck knife in the prior art.

[0058] The grinding spherical surface fits with the spherical surface of the radius to be processed, which can ensure that the grinding head 1 can rotate and swing relative to the inner spherical cavity. There is a grinding medium, such as grinding sand, between the spherical surface of the radius to be processed and the grinding arc surface 10.

[0059] The spherical surface to be processed has a grinding allowance of 0.02mm-0.05mm. After the inner spherical cavity grinding tool is assembled, there is an assembly gap between the grinding spherical surface and the spherical surface to be processed, and the assembly gap is 0.01mm or even micron level. Since the grinding allowance and assembly gap are very small, the size change of the grinding spherical surface is very small.

[0060] The grinding spherical surface fits with the spherical surface with the radius to be processed, so as to increase the force between the grinding spherical surface and the spherical surface with the radius to be processed, and make the grinding spherical surface and the spherical surface with the radius to be processed evenly contact. During the grinding process, the spherical surface with the radius to be processed is used as a reference and guide, and the expansion shaft 4 is rotated and swung, so that the grinding head 1 moves in accordance with the guiding effect of the inner ball cavity, wherein the rotation and swinging action of the expansion shaft 4 can be realized manually or with the assistance of a swinging machine.

[0061] The grinding head 1 further precisely grinds the spherical surface with the radius to be processed to obtain a target spherical surface with a smoother surface and more precise size, so that the size of the target spherical surface is accurate to the micron level of 0.001-0.002 microns.

[0062] The split-design grinding head 1 enters the inner spherical cavity through the window 6 on the side wall of the inner spherical cavity, and is assembled with the fixed seat 2 in the inner spherical cavity to form a grinding spherical surface. After the grinding spherical surface is adjusted to fit the spherical surface with the radius to be processed, grinding is performed with the spherical surface with the radius to be processed as the reference and guide, thereby realizing high-precision one-piece molding of the inner spherical surface.

[0063] Embodiment 2:

[0064] In this embodiment, based on the first embodiment, a through hole 11 is provided on the grinding head 1, the window 6 includes an axial opening 62 and a side opening 61, the expansion shaft 4 corresponds to the axial opening 62, and the assembly steps of the inner ball cavity grinding tool are as follows:

[0065] First, multiple grinding heads 1 are placed into the inner spherical cavity through the window 6, so that the multiple grinding heads 1 are distributed and arranged in the circumferential direction with the spherical surface of the radius to be processed as the base surface. Each grinding head 1 is provided with a grinding arc surface 10, which can be placed through the axial opening 62 or the side opening 61 according to the size. After the multiple grinding heads 1 are distributed along the circumferential direction, the grinding heads 1 are preliminarily fitted with the spherical surface of the radius to be processed;

[0066] After the fixing seat 2 is placed between the multiple grinding heads 1 through the window 6, the grinding heads 1 are detachably connected to the mounting parts 21 on the fixing seat 2. The multiple grinding heads 1 correspond to the multiple mounting parts 21 on the fixing seat 2 one by one. The multiple grinding arc surfaces 10 form a grinding spherical surface that matches the spherical surface with a radius to be processed. The multiple mounting parts 21 are distributed along the circumferential direction with the central through hole 23 of the fixing seat 2 as the center. The central through hole 23 is used to install the expansion shaft 4.

[0067] When assembling the fixing seat 2, the fixing seat 2 is placed between the plurality of grinding heads 1 through the axial opening 62, the fasteners are installed in the through holes 11 on the grinding heads 1 through the side openings 61, and the grinding heads 1 are detachably connected to the mounting portion 21 through the fasteners.

[0068] The expansion shaft 4 can be installed through the axial opening 62 , and the fixing seat 2 with the expansion shaft 4 installed and the grinding head 1 can also be assembled in the inner spherical cavity, and specifically one end of the expansion shaft 4 is located outside the inner spherical cavity.

[0069] Embodiment three:

[0070] Based on the above embodiments, this embodiment provides a method and principle for adjusting the size of the grinding spherical surface to increase the grinding spherical surface, as follows:

[0071] A pair of adjacent mounting portions 21 among the plurality of mounting portions 21 are separated by an opening gap 24, and the remaining adjacent mounting portions 21 are elastically connected by elastic arms 22 and are provided with deformation gaps 221 penetrating through both ends of the fixing seat 2. The plurality of mounting portions 21 and the elastic arms 22 enclose a central through hole 23;

[0072] When adjusting the axial relative position of the expansion shaft 4 and the central through hole 23, an external force is applied to the fixing seat 2 to cause elastic deformation of the elastic arm 22, thereby increasing the opening gap 24, reducing the deformation gap 221, and increasing the diameter of the central through hole 23, thereby increasing the grinding spherical surface and fitting it with the spherical surface of the radius to be processed.

[0073] The deformation gap 221 is located on the circumferential outer side of the fixing seat 2, providing a deformation space for the relative position change of the mounting portion 21. Due to the small grinding allowance, the deformation amount of the elastic arm 22 is also small.

[0074] In this embodiment, there are four mounting parts 21. The more mounting parts 21 there are, the more grinding heads 1 there are, and the higher the grinding accuracy is.

[0075] Furthermore, the center through hole 23 is a tapered circular hole, and a tapered axial surface 41 matching the center through hole 23 is provided on the expansion shaft 4. A limit assembly 3 is installed at one end of the expansion shaft 4. The limit assembly 3 applies a tensile force to the expansion shaft 4 and applies pressure to the end surface of the fixed seat 2. The tensile force and the pressure are in opposite directions. After the tapered axial surface 41 moves relative to the center through hole 23, the elastic arm 22 undergoes elastic deformation and the diameter of the center through hole 23 increases.

[0076] Furthermore, the limiting assembly 3 includes a bolt 31 and a gasket 32. A threaded hole is provided at the end of the tightening shaft 4 on the small end side of the tapered shaft surface 41. The bolt 31 is threadedly connected to the threaded hole. The gasket 32 ​​contacts the end surface of the fixing seat 2. By changing the installation depth of the bolt 31 in the threaded hole, the pressure of the head of the bolt 31 on the gasket 32 ​​is changed, thereby causing the elastic arm 22 to undergo elastic deformation.

[0077] The grinding head 1, the fixing seat 2 and the expansion shaft 4 are relatively fixed in the cross-sectional direction to ensure that the grinding head 1, the fixing seat 2 and the expansion shaft 4 as a whole rotate relative to the workpiece body 5. Specifically, in this embodiment, the conical shaft surface 41 expands the central through hole 23 of the conical circular hole structure, causing the elastic arm 22 to undergo elastic deformation.

[0078] After the fixing seat 2 is placed in the inner spherical cavity, the bolts 31 and the gaskets 32 can be installed through the axial opening 62 to connect the expansion shaft 4 to the fixing seat 2, and the fasteners can be installed through the side opening 61 to detachably connect the grinding head 1 to the mounting portion 21 on the fixing seat 2.

[0079] Exemplarily, the taper of the tapered shaft surface 41 is 1:20-1:30.

[0080] Specifically, when the taper of the tapered shaft surface 41 is 1:25, when the installation depth of the bolt 31 in the threaded hole increases by 0.5 mm, the diameter of the grinding spherical surface increases by 0.01 mm. By rotating the bolt 31 to adjust the installation depth of the bolt 31 in the threaded hole, the adjustment of the installation depth can be achieved in a slight amount. The change of the central through hole 23 caused by rotating the bolt 31 is slight, and the size of the grinding spherical surface can be fine-tuned.

[0081] Exemplarily, a weakening hole 222 is provided between the elastic arm 22 and the deformation gap 221 . The weakening hole 222 is consistent with the central through hole 23 in length and direction, and the weakening hole 222 is communicated with the deformation gap 221 .

[0082] The fixing seat 2 is made of an integral steel piece, a weakened hole 222 is arranged at the end of the deformation gap 221 , and an elastic arm 22 is formed between the weakened hole 222 and the central through hole 23 .

[0083] Preferably, the cross section of the weakened hole 222 is circular, so as to achieve a better elastic deformation effect.

[0084] By providing an elastically deformable fixing seat 2 and a tapered shaft hole structure, the central through hole 23 of the fixing seat 2 is expanded, and the relative position of the grinding head 1 installed on the mounting portion 21 of the fixing seat 2 is changed by increasing the diameter of the central through hole 23, thereby increasing the grinding spherical surface.

[0085] Embodiment 4:

[0086] Based on the second embodiment, the assembly steps of the inner ball cavity grinding tool are as follows:

[0087] First, multiple grinding heads 1 are placed into the inner spherical cavity through the window 6, so that the multiple grinding heads 1 are distributed and arranged in the circumferential direction with the spherical surface of the radius to be processed as the base surface. Each grinding head 1 is provided with a grinding arc surface 10, which can be placed through the axial opening 62 or the side opening 61 according to the size. After the multiple grinding heads 1 are distributed along the circumferential direction, the grinding heads 1 are preliminarily fitted with the spherical surface of the radius to be processed;

[0088] The fixing seat 2 is placed between the plurality of grinding heads 1 through the window 6, and firstly, the first positioning groove 12 on the grinding head 1 and the second positioning groove 211 on the mounting portion 21 are matched with the positioning pin 212 from both sides of the positioning pin 212 to define the relative position of the grinding head 1 and the mounting portion 21 in a direction perpendicular to the axis of the central through hole 23;

[0089] Then, by matching the boss 25 at one end of the mounting portion 21 with the groove 13 at one end of the grinding head 1, the relative positions of the mounting portion 21 and the grinding head 1 in the axial direction of the central through hole 23 are defined, and the plurality of grinding arc surfaces 10 form a grinding spherical surface that matches the spherical surface with the radius to be processed;

[0090] The fastener is installed in the through hole 11 on the grinding head 1 through the side opening 61 , and the grinding head 1 is detachably connected to the mounting portion 21 through the fastener.

[0091] Specifically, the positioning pin 212 is in the shape of a round rod, and its axis is consistent with the axis direction of the expansion shaft 4 after installation. Two second positioning grooves 211 parallel to each other are provided on each installation portion 21 .

[0092] The structure of the positioning pin 212 cooperating with the two positioning grooves, and the structure of the boss 25 cooperating with the groove 13 realize the lateral positioning and longitudinal positioning of the grinding head 1 and the mounting portion 21. The grinding head 1 and the fixing seat 2 are put into the inner ball cavity through the window 6 and assembled together. The above positioning structure facilitates the positioning and assembly operation of the auxiliary grinding head 1 and the fixing seat 2 inside the inner ball cavity.

[0093] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A high-precision processing method for an inner spherical cavity, characterized in that: The inner surface of the inner spherical cavity is provided with a spherical surface with a radius to be processed, and a window (6) is provided on the side wall of the inner spherical cavity. The processing method comprises the following steps: Inner spherical cavity grinding tool assembly: a fixed seat (2) and a plurality of grinding heads (1) are placed in the inner spherical cavity through a window (6), each grinding head (1) is provided with a grinding arc surface (10), the plurality of grinding heads (1) are detachably connected to a plurality of mounting parts (21) on the fixed seat (2), the plurality of grinding arc surfaces (10) form a grinding spherical surface matching the spherical surface with a radius to be processed, the plurality of mounting parts (21) are distributed along a circumferential direction with a central through hole (23) of the fixed seat (2) as the center, and the central through hole (23) is used to mount a tensioning shaft (4); Adjusting the size of the grinding spherical surface: the expansion shaft (4) is installed in the central through hole (23), and the axial relative position of the expansion shaft (4) and the central through hole (23) is adjusted, thereby changing the relative positions between the plurality of mounting parts (21), so that the grinding spherical surface is enlarged and fits with the spherical surface of the radius to be processed; Grinding: After the grinding spherical surface is fitted with the spherical surface with the radius to be processed, the grinding head (1) is rotated and swung relative to the inner spherical cavity with the spherical surface with the radius to be processed as a reference and guide, and the grinding spherical surface grinds the spherical surface with the radius to be processed; After one grinding process, the current spherical surface size is confirmed. If the target spherical surface requirements are met, the grinding process is completed. If the target spherical surface requirements are not met, the grinding spherical surface size adjustment step is performed and the grinding process is performed again until the current spherical surface size meets the target spherical surface requirements.

2. The high-precision processing method for the inner spherical cavity according to claim 1, characterized in that: In the steps of assembling the inner spherical cavity grinding tool, a plurality of grinding heads (1) are first placed into the inner spherical cavity through the window (6), so that the plurality of grinding heads (1) are arranged in a circumferential direction with the spherical surface of the radius to be processed as the base surface, and then a fixing seat (2) is placed between the plurality of grinding heads (1) through the window (6), and the grinding heads (1) are detachably connected to the mounting portion (21) on the fixing seat (2).

3. The high-precision processing method for the inner spherical cavity according to claim 2, characterized in that: The grinding head (1) is provided with a through hole (11), the window (6) comprises an axial opening (62) and a side opening (61), and the expansion shaft (4) corresponds to the axial opening (62); When assembling the fixing seat (2), the fixing seat (2) is placed between the plurality of grinding heads (1) through the axial opening (62), the fastener is installed in the through hole (11) on the grinding head (1) through the side opening (61), and the grinding head (1) is detachably connected to the mounting portion (21) through the fastener.

4. The high-precision processing method for inner spherical cavity according to claim 1, characterized in that: A pair of adjacent mounting portions (21) among the plurality of mounting portions (21) are separated by an open gap (24), and the remaining adjacent mounting portions (21) are elastically connected by elastic arms (22) and are provided with deformation gaps (221) that penetrate through both ends of the fixing seat (2), and the plurality of mounting portions (21) and the elastic arms (22) enclose the central through hole (23); When adjusting the axial relative position of the expansion shaft (4) and the central through hole (23), an external force is applied to the fixing seat (2), causing the elastic arm (22) to undergo elastic deformation, thereby increasing the opening gap (24) and reducing the deformation gap (221). The diameter of the central through hole (23) increases, thereby increasing the size of the ground spherical surface and making it fit with the spherical surface of the radius to be processed.

5. The high-precision processing method for the inner spherical cavity according to claim 4, characterized in that: The central through hole (23) is a tapered circular hole. The expansion shaft (4) is provided with a tapered axial surface (41) matching the central through hole (23). A limiting assembly (3) is installed at one end of the expansion shaft (4). The limiting assembly (3) applies a tensile force to the expansion shaft (4) and applies pressure to the end surface of the fixing seat (2). The tensile force and the pressure are in opposite directions. After the tapered axial surface (41) moves relative to the central through hole (23), the elastic arm (22) undergoes elastic deformation, and the diameter of the central through hole (23) increases.

6. The high-precision processing method for the inner spherical cavity according to claim 5, characterized in that: The limiting assembly (3) comprises a bolt (31) and a gasket (32); a threaded hole is provided at the end of the expansion shaft (4) on the small end side of the tapered shaft surface (41); the bolt (31) is threadedly connected to the threaded hole; the gasket (32) contacts the end surface of the fixing seat (2); and the pressure of the head of the bolt (31) on the gasket (32) is changed by changing the installation depth of the bolt (31) in the threaded hole, thereby causing the elastic arm (22) to undergo elastic deformation.

7. The high-precision processing method for the inner spherical cavity according to claim 5, characterized in that: The taper of the tapered axial surface (41) is 1:20-1:

30.

8. The high-precision processing method for inner spherical cavity according to claim 4, characterized in that: A weakening hole (222) is provided between the elastic arm (22) and the deformation gap (221); the weakening hole (222) is consistent in length and direction with the central through hole (23); and the weakening hole (222) is in communication with the deformation gap (221).

9. The high-precision inner spherical cavity processing method according to claim 2, characterized in that: The process of placing the fixing seat (2) between the plurality of grinding heads (1) through the window (6) comprises the following steps: The relative position of the grinding head (1) and the mounting portion (21) in a direction perpendicular to the axis of the central through hole (23) is limited by simultaneously engaging the first positioning groove (12) on the grinding head (1) and the second positioning groove (211) on the mounting portion (21) with the positioning pin (212) from both sides of the positioning pin (212); By matching the boss (25) at one end of the mounting portion (21) with the groove (13) at one end of the grinding head (1), the relative positions of the mounting portion (21) and the grinding head (1) in the axial direction of the central through hole (23) are limited, and a plurality of grinding arc surfaces (10) form a grinding spherical surface that matches the spherical surface with the radius to be processed.

10. The high-precision processing method for inner spherical cavity according to claim 1, characterized in that: In the grinding process, the grinding head (1) is rotated and swung relative to the inner ball cavity by manually rotating and oscillating the expansion shaft (4) regularly.

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