A machining tool and method for a ring-shaped flexible gear

Abstract

The application relates to a processing tool for a ring-shaped flexible gear, which comprises a boring inner hole tool, a flat grinding tool, a turning outer circle tool, a gear hobbing tool and a gear hobbing dismounting tool; the flat grinding tool comprises a pair of V-shaped bodies for fixing the ring-shaped flexible gear; the boring inner hole tool comprises a sleeve and a gland cap which is detachably matched on the upper end of the sleeve; the turning outer circle tool comprises a fine turning mandrel and a fine turning gasket; the gear hobbing tool comprises a taper mandrel and a gear hobbing mandrel which is detachably matched on the taper mandrel; the gear hobbing dismounting tool has an accommodating space inside and a dismounting tool hole is formed in the top center; the gear hobbing dismounting tool is matched and installed on the lower end of the gear hobbing mandrel through the dismounting tool hole. The application has reasonable design, simple and convenient clamping, high processing efficiency and high precision.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically relating to a machining fixture and method for a circular flexible wheel. Background Technology

[0002] Harmonic gear transmission is a widely used mechanical transmission technology. Its main components include flexible gears, rigid gears, and cams. Among them, the flexible gears come in various structural forms such as cup-shaped, bow-shaped, and ring-shaped. The ring-shaped flexible gear is the earliest form of flexible gear and is now mainly used in harmonic reducers for servo motors, drones, and missiles. Its original processing method is difficult to disassemble and is not suitable for mass production, resulting in a relatively poor yield and processing quality of the ring-shaped flexible gear.

[0003] See attached document Figure 7 The circular flexible gear 6 structure shown, for a flexible gear with a module of 0.2~0.4, has an overall wall thickness Δ1 of approximately 0.6mm~0.8mm, a lower wall thickness Δ2 at the tooth root of approximately 0.3mm~0.4mm, and a tooth ring outer circle runout requirement of 0.008mm. It belongs to the category of thin-walled parts with high precision requirements. The boring tooling originally used for machining this type of part is attached. Figure 8-9 As shown, an open cast iron sleeve 8 is fitted onto the outer diameter of the circular flexible wheel 6, and the inner holes øA and øB are bored. This machining method has two disadvantages: First, the thickness and opening size of the open cast iron sleeve 8 are difficult to determine. If it is too thin, it is easy to deform under clamping, resulting in poor machining accuracy and difficulty in disassembling the cast iron sleeve after machining. If it is too thick, it cannot completely cover the outer diameter of the circular flexible wheel 6, resulting in excessive runout of the inner hole of the part and inconsistent machining accuracy. Second, it is not suitable for mass production. Each clamping requires aligning the runout of the inner hole of the circular flexible wheel 6, which increases the machining time and cost.

[0004] In conclusion, it is necessary to further improve and innovate existing technologies. Summary of the Invention

[0005] To address the technical problems mentioned above, a machining tooling and method for circular flexible wheels is proposed, which features a reasonable design, high product assembly and disassembly efficiency, high controllability, high machining accuracy, and good machining effect, while reducing time costs and improving product yield.

[0006] The technical solution of the present invention is as follows:

[0007] The aforementioned machining fixtures for the circular flexible gear include internal boring fixtures, surface grinding fixtures, external turning fixtures, gear hobbing fixtures, and gear hobbing disassembly fixtures.

[0008] The surface grinding fixture includes a pair of V-shaped bodies for fixing a circular flexible wheel; during surface grinding, the circular flexible wheel is fixed between the pair of V-shaped bodies.

[0009] The boring tool includes a sleeve and a matching, detachable cap fitted onto the upper end of the sleeve; the upper inner wall of the sleeve has a circumferentially circumferentially formed lower annular groove for the flexible wheel; the cap has a through hole in the middle, and the upper inner wall has a matching circumferentially formed upper annular groove for the flexible wheel; during boring, the annular flexible wheel is pressed between the upper annular groove and the lower annular groove of the flexible wheel;

[0010] The external turning tooling includes a precision turning mandrel and a precision turning shim. During external turning, the upper end of the precision turning mandrel is fitted into the inner hole of the circular flexible wheel. The precision turning shim is placed on the upper end face of the circular flexible wheel and fixed to the precision turning mandrel with screws to press and fix the precision turning shim to the upper end face of the circular flexible wheel.

[0011] The gear hobbing fixture includes a tapered mandrel and a matching, detachable gear hobbing mandrel fitted onto the tapered mandrel; the upper sidewall of the gear hobbing mandrel is provided with an upper step, and a root cleaning groove is matchedly opened at the root of the longitudinal surface of the upper step; during gear hobbing, a circular flexible wheel is fitted onto the longitudinal surface of the upper step;

[0012] The gear hobbing disassembly fixture has an internal accommodating space and a disassembly fixture hole that is matched and opened through the center of the top; the gear hobbing disassembly fixture is matched and installed on the lower end of the gear hobbing mandrel through the disassembly fixture hole.

[0013] The machining fixture for the circular flexible wheel includes a clearance fit between the lower annular groove of the flexible wheel and the outer circle of the circular flexible wheel.

[0014] The machining fixture for the circular flexible wheel, wherein the circular flexible wheel and the outer circle of the longitudinal surface of the upper step are in a transition fit.

[0015] The machining fixture for the circular flexible wheel includes: an external thread on the upper outer wall of the sleeve along the circumferential direction; an internal thread on the lower inner wall of the gland along the circumferential direction; and the gland being connected to the external thread on the upper end of the sleeve via the internal thread.

[0016] The machining fixture for the circular flexible wheel includes: a central hole at the center of each end of the tapered mandrel; the outer diameter of the tapered mandrel increases from top to bottom and has a taper angle of 0.5°.

[0017] The machining fixture for the circular flexible wheel includes: a through hole in the middle of the gear hobbing mandrel and a fitting sleeve on the tapered mandrel through the through hole.

[0018] A method for machining a circular flexible wheel, based on the aforementioned machining fixture for the circular flexible wheel, mainly includes the following steps:

[0019] (1) Surface grinding;

[0020] The circular flexible wheel is fixed between a pair of V-shaped bodies of the flat grinding fixture to ensure the perpendicularity of the two end faces of the circular flexible wheel to the axis of the inner hole. The reference is then converted. First, the two end faces of the circular flexible wheel are flat ground, and then the inner hole is machined with the end face of the circular flexible wheel as the reference.

[0021] (2) Fine turning;

[0022] (2.1) Boring the inner hole, that is, clamping the sleeve of the boring tool through the three-jaw chuck of the machine tool, aligning the sleeve runout within 0.005mm, first placing the circular flexible wheel with both ends flat ground into the sleeve, positioning it at the lower end face of the circular flexible wheel, then screwing the pressure plate of the boring tool onto the sleeve, the upper end face of the circular flexible wheel close to the annular groove on the flexible wheel of the pressure plate, boring the inner hole øA and øB, ensuring the dimension L1, so as to ensure the perpendicularity of the end face of the circular flexible wheel to the center of the inner hole is 0.01mm;

[0023] (2.2) Turning the outer diameter, that is, using the machine tool's three-jaw chuck to clamp the precision turning mandrel of the outer diameter turning fixture and align the precision turning mandrel to within 0.005mm of runout. The ring-shaped flexible wheel with the inner hole finished is put into the precision turning mandrel and positioned at the lower end face 1b of the ring-shaped flexible wheel. Then, the precision turning shim and nut are used to press the upper end face 1a of the ring-shaped flexible wheel and turn the outer diameter øC of the ring-shaped flexible wheel.

[0024] (3) Gear hobbing;

[0025] First, assemble the hobbing mandrel and the circular flexible wheel of the hobbing fixture. Then, insert the tapered mandrel of the hobbing fixture into the inner hole of the hobbing mandrel. Align the outer circle runout of the circular flexible wheel within 0.01mm and begin hobbing.

[0026] (4) Disassembly;

[0027] Place the gear hobbing tool into the disassembly hole of the gear hobbing disassembly tool, and gently tap the upper surface of the gear hobbing mandrel to disassemble the circular flexible wheel.

[0028] The machining method of the circular flexible wheel, wherein: in step (2.2), the boring of the inner hole and turning of the outer circle are both divided into three passes, with the first pass feed amount being 0.4mm, the second pass feed amount being 0.4mm, and the third pass feed amount being 0.1mm. Beneficial effects

[0029] The machining tooling structure of the circular flexible wheel of this invention is simple and reasonable, the product clamping is simple and convenient, the product processing efficiency is improved, the product processing accuracy is high and the consistency is good, and the product yield is improved.

[0030] The proposed machining method for the circular flexible wheel is rationally conceived and optimizes the entire machining process. The perpendicularity of both end faces of the circular flexible wheel is ensured by a surface grinding process. Using end face positioning for machining the inner hole is more effective than the previous precision turning method. Since precision turning can only guarantee the perpendicularity of one end face to the inner hole, the inner hole needs to be re-aligned when turning the other end face. However, because the flexible wheel is now a thin-walled part, the alignment result is inaccurate, resulting in one end face not being perpendicular. This invention achieves higher machining accuracy. Secondly, the use of various simple toolings reduces the time spent on repeated alignment during processes such as boring the inner hole and turning the outer diameter when mass-producing circular flexible wheels, thus lowering time costs. Simultaneously, the machining quality is largely guaranteed by the tooling, preventing large-scale scrap due to operator retirement and replacement, resulting in higher controllability and better precision consistency. The previous machining process used open cast iron sleeves, relying heavily on the operator's experience to judge the clamping force. At the same time, a special gear hobbing disassembly fixture is designed, which changes the previous reliance on striking the circular flexible wheel parts to a striking fixture, avoiding product scrapping in the final step of product forming, reducing disassembly time, lowering time costs, and improving yield. Attached Figure Description

[0031] Figure 1 This is a front view of the surface grinding fixture used for machining the circular flexible wheel of the present invention.

[0032] Figure 2 This is a top view of the surface grinding fixture used for machining the circular flexible wheel of the present invention.

[0033] Figure 3 This is a schematic diagram of the boring tool for the machining fixture of the circular flexible wheel of the present invention;

[0034] Figure 4 This is a schematic diagram of the outer cylindrical machining fixture of the machining tooling for the circular flexible wheel of the present invention;

[0035] Figure 5 This is a schematic diagram of the gear hobbing fixture used in the machining of the circular flexible wheel of the present invention.

[0036] Figure 6 This is a schematic diagram of the gear hobbing disassembly fixture for the machining tooling of the circular flexible wheel of the present invention.

[0037] Figure 7 This is a schematic diagram of the structure of a circular flexible wheel;

[0038] Figure 8 This is the front view of the boring tooling used in the original machining process;

[0039] Figure 9 This is a top view of the boring tool used in the original machining process. Detailed Implementation

[0040] The machining fixture for the circular flexible wheel of the present invention includes a flat grinding fixture 1, an inner hole boring fixture 2, an outer diameter turning fixture 3, a gear hobbing fixture 4, and a gear hobbing disassembly fixture 5.

[0041] like Figure 1-2 As shown, the flat grinding fixture 1 includes a pair of V-shaped bodies 11 for fixing the flat grinding parts, and one side of each V-shaped body 11 is provided with a V-shaped groove 111 for engaging the outer circular surface of the ring-shaped flexible wheel 6.

[0042] like Figure 3 As shown, the boring tool 2 includes a sleeve 21 and a pressure cap 22. The upper outer wall of the sleeve 21 is provided with an external thread 211 along the circumferential direction, and the upper inner wall is provided with a lower annular groove 212 for the flexible wheel along the circumferential direction. The hollow inner hole of the sleeve 21 facilitates the discharge of iron filings when boring the inner hole of the annular flexible wheel 6, and prevents damage to the inner hole of the annular flexible wheel 6 due to iron filings. The pressure cap 22 is a circular cap with a through hole 221 in the middle, an internal thread 222 along the circumferential direction on the lower inner wall, and an upper annular groove for the flexible wheel along the circumferential direction on the upper inner wall. The pressure cap 22 is connected to the external thread 211 at the upper end of the sleeve 21 through the internal thread 222. The annular flexible wheel 6 is pressed between the sleeve 21 and the pressure cap 22. Its upper end engages with the annular groove on the flexible wheel of the pressure cap 22, and its lower end engages with the lower annular groove 212 on the flexible wheel of the sleeve 21. The lower annular groove 212 on the flexible wheel of the sleeve 21 has a clearance fit with the outer circle of the annular flexible wheel 6, preventing it from seizing and facilitating disassembly and replacement. The inner diameter øE of the sleeve 21 is approximately... (øA+øC) (refers to half the sum of the small circle diameter of the stepped inner hole of the annular flexible wheel 6 and the maximum outer circle diameter of the annular flexible wheel 6 during this process); the diameter øD of the pressure cap 22 is approximately (øB+øC) (refers to half the sum of the large circle diameter of the stepped inner hole of the circular flexible wheel 6 and the maximum outer circle diameter of the circular flexible wheel 6 during this process). This structural design is to ensure that the circular flexible wheel 6 will not bend when it is pressed between the sleeve 21 and the pressure cap 22.

[0043] like Figure 4 As shown, the outer diameter tooling 3 includes a precision machining mandrel 31, a precision machining washer 32, and a screw 33. The upper end of the precision machining mandrel 31 is fitted into the inner hole of the circular flexible wheel 6. The precision machining washer 32 (with a diameter of øS) is fitted onto the upper end face of the circular flexible wheel 6. The screw 33 passes through the inner hole of the circular flexible wheel 6 of the precision machining washer 32 from top to bottom and is screwed into the upper end of the precision machining mandrel 31 to press and fix the precision machining washer 32 to the upper end face of the circular flexible wheel 6.

[0044] like Figure 5As shown, the gear hobbing fixture 4 includes a tapered mandrel 41 and a gear hobbing mandrel 42. The tapered mandrel 41 has a central hole 411 at both ends, a taper angle r of 0.5°, and an outer diameter that increases from top to bottom. The gear hobbing mandrel 42 has a through-hole in its middle section, which is fitted onto the tapered mandrel 41. The upper sidewall of the gear hobbing mandrel 42 has an upper step 422 (diameter øG). A root-cleaning groove 423 is provided at the longitudinal root of the upper step 422. Because the wall thickness of the annular flexible wheel 6 is relatively thin and the upper step 422 is small, the root-cleaning groove 423 is provided here to ensure that the end face of the annular flexible wheel 6 is in close contact with the upper step 422. The outer circle of the tapered mandrel 41 and the shaft hole of the hobbing mandrel 42 achieve a tight fit in a suitable position, so no additional washers or nuts are required. The circular flexible wheel 6 is fitted onto the longitudinal surface of the upper step 422 of the hobbing mandrel 42 and transitionally connected to the outer circle of the longitudinal surface of the upper step 422. In the hobbing fixture 4, Δ3 = (Δ2 - 0.06) mm (the width of the upper step 422 is generally the thickness of the lower wall of the tooth root of the circular flexible wheel reduced by 0.06 mm; this is an approximate size, mainly indicating that the outer diameter of the upper step 422 is smaller than the tooth root diameter of the circular flexible wheel 6). This allows the end face of the circular flexible wheel 6 to be positioned without affecting the hobbing process or damaging the hobbing cutter.

[0045] like Figure 6 As shown, the gear hobbing disassembly fixture 5 has an internal accommodating space and a disassembly fixture hole 51 that is connected through the top center. A gap Δ5, 0.1mm, is left between the diameter øH of the disassembly fixture hole 51 and the outer diameter øF of the gear hobbing mandrel 42. The gear hobbing disassembly fixture 5 is fitted onto the lower end of the gear hobbing mandrel 42 of the gear hobbing fixture 4 through the disassembly fixture hole 51. Because the tapered mandrel 41 has a taper angle r, it can be easily disassembled from the opposite direction. The gear hobbing disassembly fixture 5 is needed to disassemble the gear hobbing mandrel 42. The gear hobbing fixture 4 is placed into the disassembly fixture hole 51, and the upper surface of the gear hobbing mandrel 42 is gently tapped, allowing the circular flexible wheel 6 to be disassembled. The dimension Δ4 on the gear hobbing disassembly fixture 5 is Δ1 - ΔH. Δ2 (Δ1 is the difference between the tooth tip circle diameter of the ring-shaped flexible wheel 6 and the large circle diameter of the stepped inner hole, and Δ2 is the lower wall thickness of the tooth root of the ring-shaped flexible wheel 6); Δ4 and Δ5 (the dimensions of Δ4 and Δ5 are designed to enable the hobbing disassembly fixture 5 to perform better and achieve easy disassembly; a gap Δ5 is left between the diameter øH of the disassembly fixture hole 51 and the outer circle dimension øF of the hobbing mandrel 42, and its Δ5=0.1mm) can ensure that the disassembly fixture is easy to disassemble and will not damage the ring-shaped flexible wheel 6.

[0046] The processing method of the circular flexible wheel of the present invention mainly includes the following steps:

[0047] (1) Grind flat to ensure the overall length;

[0048] In the surface grinding process, if the contact area between the part and the machine tool table is less than 4mm, surface grinding cannot be performed. The thickness Δ1 of both ends of the circular flexible wheel 6 is relatively small, resulting in insufficient suction, making direct surface grinding impossible. Originally, a precision turning process was used to ensure the overall length, but this resulted in poor machining accuracy. Therefore, the design... Figure 1-2 The V-shaped body 11 of the surface grinding fixture 1 shown is fixed. During surface grinding, the annular flexible wheel 6 is fixed between the two V-shaped bodies 11. Because the contact area between the V-shaped body 11 and the machine tool table is large, the V-shaped body 11 can be fixed to the machine tool table by suction, thus ensuring that the annular flexible wheel 6 clamped between the two V-shaped bodies 11 will not move during surface grinding, completing the surface grinding process and ensuring the overall length dimension; the drawing of the annular flexible wheel 6 requires that the two end faces be aligned with the inner hole axis of the annular flexible wheel 6 ( Figure 7 The perpendicularity of datum A shown is used for datum conversion. First, the end face is ground flat, and then the inner hole is machined with the end face as the datum.

[0049] The method of using V-shaped body 11 to fix the surface grinding parts can be used to process all parts with similar small contact areas between the surface and the surface grinding machine table.

[0050] The height L3 of V-shaped body 11 is approximately The height L2 is twice that of the inner diameter øB of the circular flexible wheel 6, because the ratio of the inner diameter øB to the thickness Δ1 is 60~80. The circular flexible wheel 6 is prone to tilting during the flat grinding process. Therefore, the height L3 of the V-shaped body 11 should be as large as possible to protect the circular flexible wheel 6 from tilting during the flat grinding process.

[0051] (2) Finish turning, including boring the inner hole and turning the outer circle;

[0052] (2.1) Refer to Appendix Figure 3 During machining, the machine tool's three-jaw chuck clamps the sleeve 21, aligning the sleeve 21 to within 0.005mm of runout. The circular flexible wheel 6, with its two end faces flat ground, is first placed into the sleeve 21 and positioned at its lower end face. Then, the pressure cap 22 is screwed onto the sleeve 21, with the upper end face of the circular flexible wheel 6 abutting against the end face of the annular groove on the flexible wheel of the pressure cap 22. The inner holes øA and øB are bored to ensure dimension L1. This ensures that the perpendicularity between the end face of the circular flexible wheel 6 and the center of the inner hole is 0.01mm. At the same time, the positioning reference changes from the outer circle of the circular flexible wheel 6 in the original boring tool 2 to the two end faces of the circular flexible wheel 6. The inner hole of the sleeve 21 and the outer circle of the circular flexible wheel 6 will not lock together, facilitating disassembly and replacement.

[0053] The boring fixture 2 is suitable for mass production. During the machining process, it only needs to be aligned once. The circular runout at 4b and the end face runout at 4c of the inner hole of the alignment sleeve 21 are within 0.005mm. Afterward, the inner hole can be bored by simply installing the circular flexible wheel 6. There is no need to repeatedly align the inner hole runout of the circular flexible wheel 6, which can shorten the machining cycle.

[0054] The positioning reference of the boring inner hole tool 2 is changed from the outer circle of the circular flexible wheel 6 of the original boring inner hole tool to the two end faces of the circular flexible wheel 6. The inner hole 4c of the sleeve 21 is in clearance fit with the outer circle of the circular flexible wheel 6, which will not lock up and is easy to disassemble and replace.

[0055] (2.2) Refer to Appendix Figure 4 The external cylindrical tooling 3 shown is used for machining. During machining, the machine tool's three-jaw chuck clamps the precision turning mandrel 31 and aligns the precision turning mandrel 31 so that its runout is within 0.005mm. The circular flexible wheel 6 with its inner hole machined is then fitted onto the precision turning mandrel 31 and positioned at the lower end face 1b of the circular flexible wheel 6. Then, the precision turning shim 32 and screw 33 are used to press the upper end face 1a of the circular flexible wheel 6 together, and the circle øC of the circular flexible wheel 6 is machined.

[0056] The external cylindrical tooling 3 is suitable for mass production. During processing, it only needs to be aligned once to correct the runout of the outer diameter of the precision machining mandrel 31. It is not necessary to align the outer diameter every time the circular flexible wheel 6 is installed, thus shortening the processing time.

[0057] The boring of the inner hole and turning of the outer diameter both require three passes. The feed rate for the first pass is 0.4mm, the feed rate for the second pass is 0.4mm, and the feed rate for the third pass is 0.1mm. The third pass is a finishing process. This feed method is suitable for machining all thin-walled parts, reducing part deformation and improving the surface finish of the parts.

[0058] (3) Gear hobbing;

[0059] See attached document Figure 5 When using the gear hobbing fixture 4 shown, first assemble the gear hobbing mandrel 42 and the circular flexible wheel 6, then insert the tapered mandrel 41 into the inner hole of the gear hobbing mandrel 42, align the outer circle runout of the circular flexible wheel 6 within 0.01mm, and start gear hobbing.

[0060] See attached document Figure 6 The gear hobbing disassembly fixture 5 shown can be easily disassembled from the opposite direction because the tapered mandrel 41 has a taper angle r. The gear hobbing disassembly fixture 5 is required when disassembling the gear hobbing mandrel 42. The gear hobbing fixture 4 is placed into the disassembly fixture hole 51 of the gear hobbing disassembly fixture 5, and the upper surface of the gear hobbing mandrel 42 is gently tapped, and the circular flexible wheel 6 can be disassembled.

[0061] This invention has a reasonable concept, simple and convenient product clamping, improves product processing efficiency, high product processing accuracy and good consistency, and improves product yield.

Claims

1. A method for machining a circular flexible wheel, based on a machining fixture for the circular flexible wheel, characterized in that: (1) Surface grinding; The circular flexible wheel (6) is fixed between a pair of V-shaped bodies (11) of the flat grinding fixture (1) to ensure the perpendicularity of the two end faces of the circular flexible wheel (6) to the inner hole axis. The reference conversion is then performed. The two end faces of the circular flexible wheel (6) are first flat ground, and then the inner hole is machined with the end face of the circular flexible wheel (6) as the reference. (2) Fine turning; (2.1) Boring the inner hole, that is, clamping the sleeve (21) of the boring tool (2) with the three-jaw chuck of the machine tool, aligning the runout of the sleeve (21) within 0.005mm, first placing the circular flexible wheel (6) with the flat ground end face into the sleeve (21), positioning it at the lower end face of the circular flexible wheel (6), then screwing the pressure plate (22) of the boring tool (2) onto the sleeve (21), the upper end face of the circular flexible wheel (6) close to the annular groove on the flexible wheel of the pressure plate (22), boring the inner hole øA and øB, ensuring the dimension L1, so as to ensure that the perpendicularity between the end face of the circular flexible wheel (6) and the center of the inner hole is 0.01mm; (2.2) Turn the outer diameter, that is, clamp the precision turning mandrel (31) of the outer diameter turning fixture (3) with the three-jaw chuck of the machine tool, align the precision turning mandrel (31) to runout within 0.005mm, put the ring-shaped flexible wheel (6) with the inner hole completed into the precision turning mandrel (31), and position it at the lower end face 1b of the ring-shaped flexible wheel (6), and then use the precision turning shim (32) and screw (33) to press the upper end face 1a of the ring-shaped flexible wheel (6) to turn the outer diameter øC of the ring-shaped flexible wheel (6); (3) Gear hobbing; First, assemble the hobbing mandrel (42) and the circular flexible wheel (6) of the hobbing fixture (4). Then, insert the tapered mandrel (41) of the hobbing fixture (4) into the inner hole of the hobbing mandrel (42), align the outer circle runout of the circular flexible wheel (6) within 0.01mm, and start hobbing. (4) Disassembly; Place the gear hobbing tool (4) into the disassembly tool hole (51) of the gear hobbing disassembly tool (5), and gently tap the upper surface of the gear hobbing mandrel (42) to disassemble the circular flexible wheel (6). The machining fixture for the circular flexible wheel includes a boring fixture (2); the machining fixture also includes a surface grinding fixture (1), an external turning fixture (3), a gear hobbing fixture (4), and a gear hobbing disassembly fixture (5). The flat grinding fixture (1) includes a pair of V-shaped bodies (11) for fixing the circular flexible wheel (6); during the flat grinding process, the circular flexible wheel (6) is fixed between the pair of V-shaped bodies (11); The boring tool (2) includes a sleeve (21) and a cap (22) that is detachably fitted onto the upper end of the sleeve (21); the upper inner wall of the sleeve (21) is provided with a lower annular groove (212) for the flexible wheel along the circumferential direction; the middle of the cap (22) is provided with a through hole (221), and the upper inner wall is provided with a matching upper annular groove for the flexible wheel along the circumferential direction; during boring, the annular flexible wheel (6) is pressed between the upper annular groove and the lower annular groove (212) for the flexible wheel; The external turning tool (3) includes a precision turning mandrel (31) and a precision turning shim (32); during external turning, the upper end of the precision turning mandrel (31) is fitted into the inner hole of the circular flexible wheel (6); the precision turning shim (32) is placed on the upper end face of the circular flexible wheel (6) and fixed to the precision turning mandrel (31) by screws (33) to press and fix the precision turning shim (32) to the upper end face of the circular flexible wheel (6); The gear hobbing fixture (4) includes a tapered mandrel (41) and a gear hobbing mandrel (42) that is detachably fitted onto the tapered mandrel (41); the upper side wall of the gear hobbing mandrel (42) is provided with an upper step (422), and a root cleaning groove (423) is provided at the root of the longitudinal surface of the upper step (422); during gear hobbing, a circular flexible wheel (6) is fitted onto the longitudinal surface of the upper step (422); The gear hobbing disassembly fixture (5) has an internal accommodating space and a disassembly fixture hole (51) is provided in the center of the top; the gear hobbing disassembly fixture (5) is installed on the lower end of the gear hobbing mandrel (42) through the disassembly fixture hole (51).

2. The processing method of the circular flexible wheel as described in claim 1, characterized in that: In step (2.2), the boring of the inner hole and turning of the outer circle both require three passes: the first pass has a feed of 0.4 mm, the second pass has a feed of 0.4 mm, and the third pass has a feed of 0.1 mm.

3. The processing method of the circular flexible wheel as described in claim 1, characterized in that: The annular groove (212) under the flexible wheel and the outer circle of the circular flexible wheel (6) are in clearance fit.

4. The processing method of the circular flexible wheel as described in claim 1, characterized in that: The circular flexible wheel (6) and the longitudinal outer circle of the upper step (422) are in a transition fit.

5. The processing method of the circular flexible wheel as described in claim 1, characterized in that: The upper outer wall of the sleeve (21) is provided with an external thread (211) in the circumferential direction; the lower inner wall of the pressure cap (22) is provided with an internal thread (222) in the circumferential direction; the pressure cap (22) is connected to the external thread (211) at the upper end of the sleeve (21) through the internal thread (222).

6. The processing method of the circular flexible wheel as described in claim 1, characterized in that: The tapered mandrel (41) has a central hole (411) at the center of each end; the outer diameter of the tapered mandrel (41) increases from top to bottom and has a taper angle of 0.5°.

7. The processing method of the circular flexible wheel as described in claim 1: the hobbing mandrel (42) has a through hole in the middle and is fitted onto the tapered mandrel (41) through the through hole.

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