CN114749971B - Method and tool for machining outer circle of thin-wall part - Google Patents

Abstract

Providing a thin-wall part excircle processing method and tool, wherein the thin-wall part excircle processing tool is provided with a split hollow structure; after the fixture is clamped on a numerical control lathe, a self-made compression nut and a compression nut glue block are used, a rotary axial displacement compression mode is adopted, parts are clamped on the fixture in an interference fit mode, and the fixture is fully supported from the inside to prevent the parts from deforming; after the processing is finished, the parts are removed by using a locating sleeve and a locating sleeve glue wood block and adopting a rotary axial displacement reverse pushing and withdrawing mode; and (5) re-clamping new parts for processing, and disassembling after processing, so that the efficient processing of the parts in batches is completed in a reciprocating way. By adopting the technical scheme of the invention, the tool has simple design structure, light dead weight and excellent anti-wear effect; the assembly and disassembly operations of the parts from the tool are simple, stable and efficient; the parts are not deformed, and the processing efficiency is high; the tool can be repeatedly used, is economical and practical, is stable, reliable and efficient, and is suitable for popularization and promotion.

Description

Thin-walled parts outer circle processing method and tooling

Technical Field

The invention belongs to the technical field of flexible wheels of mechanical engineering transmission parts, and in particular relates to a method and tooling for machining the outer circle of a thin-walled part.

Background Art

With the development and progress of social technology, harmonic reducers are widely used in special fields such as drones, radar antennas, rocket engines, and robot joints due to their compact structure, large reduction ratio, and large bearing torque. Among them, the flexspline is a key component of the harmonic reducer. However, the flexspline with a thin-walled structure is easy to deform and difficult to process, and is a typical representative of thin-walled parts.

The present invention takes the processing of the 200-type thin-walled cup-shaped flexible wheel as shown in FIG1 as an example, the inner hole diameter of the thin-walled cylindrical flexible wheel body is D1 (ф200H6mm), the axial depth of the cylinder is L1, the axial length of the cylinder is L2, the outer circle of the cylinder is D2, the outer circle of the gear ring is D3, and the total axial length of the flexible wheel is L2; wherein, the ratio of the inner hole diameter D1 of the flexible wheel to the wall thickness of the flexible wheel body is greater than 110.

Under the existing technology, the process method for machining the outer circle of the 200-type thin-walled cup-shaped flexible wheel as shown in Figure 1 is grinding: when grinding, a mandrel support with an interference fit with the inner hole D1 of the 200-type flexible wheel is required to grind the outer circle, and the grinding process takes a long time; furthermore, since the size of the 200-type flexible wheel parts is relatively large, the outer cylindrical grinding mandrel that matches it is also relatively large in size and has a high deadweight, which makes it difficult to load and unload the flexible wheel parts and the mandrel, and requires two people to cooperate to complete; not only that, there is also the problem of severe wear of the mandrel and inconvenient loading and unloading, which makes the outer circle processing of the flexible wheel labor-intensive, time-consuming, labor-intensive, and inefficient. In response to this, the following improved technical solutions are proposed.

Summary of the invention

The technical problem solved by the present invention is to provide a method and tooling for machining the outer circle of thin-walled parts, adopt a special split hollow protective anti-wear tooling, replace grinding with turning, so as to save time and cost, and solve the technical problems of the existing flexible wheel machining being labor-consuming, time-consuming and labor-intensive.

The technical solution adopted by the present invention is as follows: a method for processing the outer circle of a thin-walled part, using a split-type hollow structure anti-wear thin-walled part outer circle processing tooling; after the thin-walled part outer circle processing tooling is clamped on a CNC lathe, a self-made clamping nut and a clamping nut bakelite block in the thin-walled part outer circle processing tooling are used, and a rotary axial displacement clamping method is adopted to clamp and fix the thin-walled part to be processed on the tooling with a concentric interference fit, and the tooling fully supports the thin-walled part from the inside to prevent the thin-walled part from deforming; after the thin-walled part is processed, a positioning sleeve and a positioning sleeve bakelite block in the thin-walled part outer circle processing tooling are used, and a rotary axial displacement reverse pushing and exiting method is adopted to remove the processed thin-walled part from the tooling; a new thin-walled part to be processed is re-clamped, and the new thin-walled part is disassembled after processing, so as to complete the batch processing of thin-walled parts in this reciprocating manner.

The outer circle machining method of a thin-walled part comprises the following steps:

S1. Mandrels, cores, locating sleeves, locating sleeve bakelite blocks, clamping nut bakelite blocks and self-made clamping nuts for machining thin-walled parts external cylindrical machining tooling.

S2. Use the core fastening screw to first coaxially fasten the core and the core shaft together, and then clamp the outer circle C0 of the cylindrical clamping end of the core shaft end on the CNC lathe to install the outer circle processing tooling of the thin-walled part in place.

S3. Align the outer circle H2 of the mandrel so that the circular runout of the outer circle of the mandrel meets the process requirements; if the circular runout of the outer circle of the mandrel does not meet the process requirements, loosen the core fastening screw and withdraw the core fastening screw from the core fastening screw installation hole on the end face of the mandrel shaft, manually rotate and adjust the mandrel until the circular runout of the outer circle of the mandrel meets the requirements, and retighten the core fastening screw.

S4. Use a wrench to coaxially screw and fit the positioning sleeve on the fine-pitch external thread rod 3a at the other end of the core shaft, until the positioning sleeve is screwed into the concave step hole at the center of the outer side of the core shaft, and the vertical concave reference positioning surface F at the extreme position of the concave step hole is close to the inner shaft end face of the positioning sleeve; install the positioning sleeve bakelite block on the stepped shaft end face of the positioning sleeve.

S5. Use a homemade clamping nut and a nut bakelite block on the outer side of the core shaft to install thin-walled parts by coaxial interference fit.

S6. Turning the outer circle of thin-walled parts.

S7. Disassemble the homemade clamping nut and the clamping nut bakelite block in turn, and use the positioning sleeve and the positioning sleeve bakelite block to disassemble the processed thin-walled parts.

S8. Repeat steps S5, S6 and S7 to process thin-walled parts in batches.

The tooling for machining the outer circle of thin-walled parts is composed of a core spindle, a core fastening screw, a positioning sleeve, a positioning sleeve bakelite block, a clamping nut bakelite block, and a self-made clamping nut which are sequentially assembled on a CNC lathe.

A cylindrical clamping end is formed at one end of the core shaft end; the cylindrical clamping end is used to coaxially clamp and fix the core on the CNC lathe; a mounting flange is formed in the middle of the core shaft body; the mounting flange uses a core fastening screw to coaxially fasten the core and the core shaft into one; a fine-pitch external thread rod is formed at the other end of the core shaft end, and the fine-pitch external thread rod extends from the inner side of the core shaft to the outer side of the core shaft end; a concave step hole is formed at the center of the outer side of the core shaft end; the concave step hole is used to accommodate one end of the positioning sleeve and the positioning sleeve bakelite block; the other end of the positioning sleeve extends out from the concave step hole of the core shaft; and the positioning sleeve is screwed on the fine-pitch external thread rod to be installed in the concave step hole; the positioning sleeve is accommodated in the outer step of the concave step hole A positioning sleeve bakelite block is provided on the shaft end face; the outer shaft end face of the core shaft and the outer cylindrical surface are concentrically interference fit to install the open end of the cylindrical flexible wheel body of the thin-walled part; and the outer shaft end face of the core shaft is close to the inner shaft end face of the flexible wheel body, and the core shaft fills the flexible wheel body; a nut bakelite block is provided on the outer shaft end face of the flexible wheel flange of the thin-walled part; a self-made clamping nut is provided on the outer shaft end face of the nut bakelite block; the self-made clamping nut is screwed to fit the fine-pitch external threaded rod; when the self-made clamping nut and the nut bakelite block are displaced axially inwardly, they are used to assemble the thin-walled part with interference fit on the core shaft; when the positioning sleeve and the positioning sleeve bakelite block are displaced axially outwardly, they are used to remove the thin-walled part with interference fit on the core shaft.

In the above technical scheme, further: the thin-walled part is a flexible wheel of a harmonic reducer; the flexible wheel is a thin-walled cup-shaped flexible wheel, and the thin-walled cup-shaped flexible wheel includes a hollow thin-walled cylindrical flexible wheel body, a flexible wheel flange is formed at one end of the flexible wheel body; a flexible wheel gear ring is formed on the outer circle of the other end of the flexible wheel body; wherein the ratio of the diameter D1 of the inner hole of the flexible wheel body cylinder to the wall thickness of the flexible wheel body is greater than.

In the above technical solution, further: step S5 includes the following steps:

S501, align the open end of the inner hole of the cylinder of the thin-walled part, the flexible wheel body, toward the axial end vertical reference positioning surface G of the mandrel, so that the inner hole D1 of the cylinder is placed on the outer end of the outer circle H2 of the mandrel.

S502. Install a compression nut bakelite block 7 on the vertical shaft end face outside the flange of the thin-walled part.

S503. Use a wrench to screw and fit the self-made compression nut onto the fine-threaded external threaded rod 3a at the end of the core shaft.

S504. Rotate the self-made clamping nut to fit the inner vertical shaft end face of the self-made clamping nut with the outer vertical shaft end face of the nut bakelite block, so as to push the clamping nut bakelite block to axially displace, until the clamping nut bakelite block pushes the thin-walled part to axially displace, and presses and fixes the thin-walled part tightly on the vertical reference positioning surface G at the end of the core shaft. At this point, the thin-walled part is clamped in place with a concentric interference fit on the outer circle H2 of the core shaft.

In the above technical solution, further: in step S6, the trajectory of the turning tool is from the axial outer side to the axial inner side of the thin-walled part; the turning process of the outer circle D2 of the thin-walled part flexible wheel body and the turning process of the outer circle D3 of the thin-walled part flexible wheel gear ring, when the blanks of the outer circle D2 and the outer circle D3 have a 0.25mm allowance respectively, the turning processing of the outer circle D2 and the outer circle D3 is divided into four feed adjustment processing: the first feed is 0.05mm/r, the second feed is 0.05mm/r, the third feed is 0.02mm/r, and the fourth feed is 0.005mm~0.01mm/r.

In the above technical scheme, further: in step S7, the method for disassembling the processed thin-walled part on the core shaft with coaxial interference fit therewith is as follows: after the homemade clamping nut and the clamping nut bakelite block are removed successively, use a wrench to rotate the protruding end of the positioning sleeve, so that the outer step shaft end face of the positioning sleeve pushes the positioning sleeve bakelite block to move axially outward, and the outer shaft end face of the positioning sleeve bakelite block that is displaced axially outward is fit with the inner shaft end face of the thin-walled part flexible wheel flange 102 to push the thin-walled part to move axially outward until the thin-walled part is completely separated from the core shaft, thereby completing the removal of the thin-walled part from the core shaft.

It also includes a thin-walled part outer circle processing tool used in the thin-walled part outer circle processing method. The thin-walled part outer circle processing tool consists of a core, a core shaft, a core fastening screw, a positioning sleeve, a positioning sleeve bakelite block, a clamping nut bakelite block, and a homemade clamping nut assembled in sequence on a CNC lathe.

A cylindrical clamping end is formed at one end of the core shaft end; the cylindrical clamping end is used to coaxially clamp and fix the core on the CNC lathe; a mounting flange is formed in the middle of the core shaft body; the mounting flange uses a core fastening screw to coaxially fasten the core and the core shaft into one; a fine-pitch external thread rod is formed at the other end of the core shaft end, and the fine-pitch external thread rod extends from the inner side of the core shaft to the outer side of the core shaft end; a concave step hole is formed at the center of the outer side of the core shaft end; the concave step hole is used to accommodate one end of the positioning sleeve and the positioning sleeve bakelite block; the other end of the positioning sleeve extends out from the concave step hole of the core shaft; and the positioning sleeve is screwed on the fine-pitch external thread rod to be installed in the concave step hole; the positioning sleeve is accommodated in the outer step of the concave step hole A positioning sleeve bakelite block is provided on the shaft end face; the outer shaft end face of the core shaft and the outer cylindrical surface are concentrically interference fit to install the open end of the cylindrical flexible wheel body of the thin-walled part; and the outer shaft end face of the core shaft is close to the inner shaft end face of the flexible wheel body, and the core shaft fills the flexible wheel body; a nut bakelite block is provided on the outer shaft end face of the flexible wheel flange of the thin-walled part; a self-made clamping nut is provided on the outer shaft end face of the nut bakelite block; the self-made clamping nut is screwed to fit the fine-pitch external threaded rod; when the self-made clamping nut and the nut bakelite block are displaced axially inwardly, they are used to assemble the thin-walled part with interference fit on the core shaft; when the positioning sleeve and the positioning sleeve bakelite block are displaced axially outwardly, they are used to remove the thin-walled part with interference fit on the core shaft.

In the above technical scheme, further: the mandrel is a cast iron mandrel; the core is a steel core; the mandrel, core, positioning sleeve, and homemade clamping nut are all high-hardness, non-wear-resistant parts that have been heat-treated and aged; the outer circle H2 runout of the mandrel is no more than 0.010mm; a weight-reducing hole is provided in the center of the mandrel.

In the above technical solution, further: the outer diameter of the self-made clamping nut and the nut bakelite block clamping working end surface is less than or equal to the outer diameter of the flexible wheel flange of the thin-walled part.

In the above technical solution, further: the end of the positioning sleeve extending from the concave step hole formed on the core shaft and the outer non-working shaft end surface of the homemade clamping nut are respectively formed with square handles; the size of the square handle is compatible with the working size of the wrench.

In the above technical solution, further: the outer end face edge of the mandrel is provided with a fillet R2; the inner end face corner of the thin-walled part flexspline body is provided with a fillet R1; and a gap is left between the fillet R2 and the fillet R1.

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

1. The present invention adopts a purely mechanical split hollow structure tooling design, and a single operator can complete the loading and unloading of the tooling on the CNC lathe, thereby solving the technical problems of the existing tooling being heavy and inconvenient to disassemble and clamp.

2. The disassembly tool composed of a positioning sleeve and a positioning sleeve bakelite block of the present invention; and the clamping tool composed of a clamping nut bakelite block and a homemade clamping nut; the disassembly tool and the clamping tool both contact the workpiece through the bakelite block structure, and the bakelite block design is specially designed to prevent steel parts from contacting and being scratched by two protective parts, which facilitates the reuse of tooling and is used to reduce wear and vibration, and solves the problem of severe wear of existing thin-walled parts and loading and unloading tooling.

3. The present invention adopts a simple rotating operation and cooperates with the fine-pitch external threaded rod design, which not only can realize the interference fit installation of the tooling on the core shaft, but also makes the clamping operation of the workpiece on the tooling simple and convenient, which is beneficial to improving the processing efficiency; and the fine-pitch external threaded rod can effectively improve the coaxial positioning accuracy, the coaxial fit of the parts and the core shaft is tight, and the interference fit assembly has good stability.

4. The thin-walled parts of the present invention are installed with interference fit on the mandrel, which effectively expands the inner hole of the thin-walled part cylinder and prevents the outer circle of the part from being deformed during machining; the outer diameter of the homemade clamping nut is not larger than the outer diameter of the flexible wheel flange of the thin-walled part, and when the homemade clamping nut axially clamps the workpiece, the outer side of the flexible wheel flange is prevented from being deformed; a gap is left between the edge fillet R2 of the mandrel and the inner fillet R1 of the flexible wheel body, so that the thin-walled part can be easily disassembled after the outer circle turning is completed, which is also used to reduce the deformation of the parts.

5. The split hollow structure tooling of the present invention realizes machining by turning instead of grinding, thereby saving time and cost and improving efficiency; the tooling design of the pure mechanical structure has the advantages of simple structure, convenient machining and manufacturing, excellent processability, reusability, economy and practicality, and is suitable for popularization and promotion.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a thin-walled part of the present invention;

Fig. 2 is a front view of the core of the present invention;

FIG3 is a schematic diagram of the structure of the core and the mandrel after being concentrically assembled;

FIG4 is a structural diagram of the disassembly and assembly mechanism used for the interference fit disassembly and assembly of thin-walled parts on the mandrel of the present invention;

FIG5 is a front view of the self-made compression nut in FIG4 of the present invention;

FIG6 is an overall assembly diagram of the tooling and parts of the present invention;

FIG7 is an enlarged detail view of Part I of FIG6;

FIG8 is an enlarged detail view of part II of FIG6;

In the figure: 1-thin-walled parts, 101-flexible wheel body, 102-flexible wheel flange, 103-flexible wheel gear ring, 104-cylinder inner hole; 2-core shaft 2, 201-outer circle H2, 202-concave step hole, 2021-concave reference positioning surface F, 203-weight reduction hole, 204-axis end vertical reference positioning surface G; 3-core, 301-cylindrical clamping end, 302-fine pitch external thread rod, 303-mounting flange; 4-core fastening screw; 5-positioning sleeve, 501-step shaft end face, 502-extending end; 6-positioning sleeve bakelite block, 7-pressure nut bakelite block, 8-self-made pressure nut, 9-square handle.

DETAILED DESCRIPTION

The following will be combined with Figures 1-8 of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

The thin-walled parts outer circle processing method uses a split hollow structure anti-wear thin-walled parts outer circle processing tooling. It can be seen that the tooling is a split hollow structure, which solves the technical problem that the existing tooling is heavy and inconvenient for one person to operate and clamp.

After the thin-walled parts outer cylindrical processing tooling is clamped on the CNC lathe, the CNC lathe is used to replace the grinding process with turning, which is beneficial to improve the processing efficiency.

Using the homemade clamping nut 8 and the clamping nut bakelite block 7 in the thin-walled part external cylindrical processing tooling, the thin-walled part 1 to be processed is concentrically clamped and fixed on the tooling by interference fit using a rotary axial displacement clamping method, and the tooling supports the thin-walled part 1 from the inside to prevent the thin-walled part from deformation.

The clamping nut bakelite block 7 is used to prevent the tooling and workpiece from being worn. The parts are clamped by a rotary axial displacement clamping method, which makes the operation of interference fit installation of the parts on the tooling simple, and solves the problem of difficult clamping and easy deformation of the parts in the concentric interference fit installation of the parts on the tooling.

After the thin-walled parts are processed, the positioning sleeve 5 and the positioning sleeve bakelite block 6 in the thin-walled parts outer circle processing tooling are used. The positioning sleeve 5 and the positioning sleeve bakelite block 6 adopt a rotary axial displacement reverse pushing and exiting method to remove the processed thin-walled parts 1 from the tooling.

The same principle as the installation of parts, the positioning sleeve bakelite block 6 is used to prevent the wear of the tooling and parts. The processed parts are disassembled by the method of rotary axial displacement reverse push and exit, which makes it easy to remove the parts installed by interference fit from the tooling, and solves the problem that the concentric interference fit between the parts and the tooling is difficult to remove and the parts are easy to deform.

The aforementioned method is adopted, that is, the self-made clamping nut 8 and the clamping nut bakelite block 7 are used to clamp the new thin-walled part 1 to be processed; after the part processing is completed, the positioning sleeve 5 and the positioning sleeve bakelite block 6 are used to disassemble the part, and the batch processing of the thin-walled parts 1 can be completed by this reciprocating process.

The present invention relates to a method for machining the outer circle of a thin-walled part, comprising the following steps:

Step S1, processing and manufacturing the mandrel 2, core 3, positioning sleeve 5, positioning sleeve bakelite block 6, clamping nut bakelite block 7 and self-made clamping nut 8 of the thin-walled part outer circle processing tool. The above components are self-made parts, and the size of the self-made parts is designed according to the thin-walled part 1.

(As shown in Figure 1) The specific size requirements of the thin-walled part 1 are: inner hole D1ф200H6, depth L1 is 181.8mm, the outer circle D2 of the cylinder of the flexible wheel body 101 is ф203.4h7mm, the outer circle D3 of the tooth of the flexible wheel gear ring 103 is ф206.972h6mm, the length L2＝194mm, L3＝183.5mm, and after calculation, the arm thickness at the two places is 1.7mm and 3.486mm respectively. The ratio of the inner hole to the wall thickness of the part is greater than 110, which is an easily deformed part.

The thin-walled parts outer circle processing tooling consists of a core 3, a core shaft 2, a core fastening screw 4, a positioning sleeve 5, a positioning sleeve bakelite block 6, a clamping nut bakelite block 7, and a self-made clamping nut 8 which are assembled in sequence on a CNC lathe.

(As shown in FIG. 2 ) A cylindrical clamping end 301 is formed at one end of the core 3 axial end; the cylindrical clamping end 301 is used to coaxially clamp the core 3 on the CNC lathe. The cylindrical clamping end 301 design facilitates rapid and high-precision positioning and clamping of the tooling on the CNC lathe.

A mounting flange 303 is formed in the middle of the shaft of the core 3; the mounting flange 303 uses the core fastening screws 4 and gaskets to coaxially fasten the core 3 and the core shaft 2 into one.

It can be seen that the tooling body, namely the core 3 and the mandrel 2, is designed as a split structure, which is convenient for the split processing of the supporting structure, saves materials, makes the tooling light, and facilitates one person to complete the clamping of the tooling.

Therefore, the present invention adopts a split type and a tooling design with a hollow core shaft structure described later, so that a single person can complete the loading and unloading of the tooling on the CNC lathe, thereby solving the technical problems of the existing tooling having a large dead weight and being inconvenient to disassemble and clamp.

The other end of the core 3 is provided with a fine-pitch external thread rod 302, which adopts a fine-pitch thread design to realize the rotation operation of the positioning sleeve 5 and the homemade clamping nut 8 on the fine-pitch external thread, which is beneficial to improve the axial displacement positioning assembly accuracy and the parts disassembly and assembly are stable.

During production, the positioning sleeve 5 is provided with an internal thread 5a, and the homemade clamping nut 8 is provided with an internal thread 8a. The internal threads 5a and 8a of the two parts and the external thread 3a of the core 3 need to be processed in coordination to ensure that the internal thread and the external thread have the smallest possible matching clearance and can be smoothly screwed in and out without jamming, so as to facilitate the rapid disassembly and assembly of the parts.

Moreover, the parallelism of the two vertical end faces of the positioning sleeve 5 and the homemade clamping nut 8 parts is not greater than 0.015 mm, so as to ensure that after the positioning sleeve 5 and the homemade clamping nut 8 are rotated and axially displaced for installation, they are stably attached to the vertical end faces of the parts.

The fine-pitch external thread rod 302 extends from the inner side of the core shaft 2 to the outer side of the axial end of the core shaft 2, so that a positioning sleeve 5 and a self-made clamping nut 8 are assembled at the protruding end.

The outer center of the axial end of the core shaft 2 is formed with a concave step hole 202; the concave step hole 202 is used to accommodate one end of the positioning sleeve 5 and the positioning sleeve bakelite block 6, that is, to realize the pre-installation of the disassembly mechanism composed of the positioning sleeve 5 and the positioning sleeve bakelite block 6.

The other end of the positioning sleeve 5 extends out from the concave step hole 202 of the mandrel 2; the other end of the positioning sleeve 5 extends out to facilitate the hand-held wrench to screw the positioning sleeve 5 and rotate and disassemble the positioning sleeve 5. That is, the positioning sleeve 5 is screwed with the fine-pitch external thread rod 302 to be installed in the concave step hole 202.

The longitudinal section of the positioning sleeve 5 is a T-shaped structure, and the outer step shaft end face 501 of the positioning sleeve 5 accommodated in the concave step hole 202 is provided with a positioning sleeve bakelite block 6. That is, it is equivalent to setting a bakelite block on the working surface of the positioning sleeve 5, and the bakelite block is used to buffer the vibration of the processing, especially to protect the workpiece from damage and wear of the parts.

The outer shaft end face and outer cylindrical surface of the mandrel 2 are both concentrically interference fit with the open end of the cylindrical flexible wheel body 101 of the thin-walled part 1. The outer shaft end face of the mandrel 2 is close to the inner shaft end face of the flexible wheel body 101, and the mandrel 2 fills the flexible wheel body 101.

That is, the inner hollow structure of the part to be processed is filled from the inside by the tooling, thereby preventing the part from deforming during the external turning process, and solving the problem of easy deformation of thin-walled parts.

On this basis: the outer axial end face of the flexible wheel flange 102 of the thin-walled part 1 is provided with a nut bakelite block 7; that is, the strongest part of the thin-walled part 1 itself, namely the flexible wheel flange 102, is utilized to apply axial thrust to the part with the help of the flexible wheel flange 102 to prevent the part from deformation.

A self-made clamping nut 8 is provided on the outer axial end surface of the nut bakelite block 7; the self-made clamping nut 8 is screwed to fit the fine-pitch external threaded rod 302; when the self-made clamping nut 8 and the nut bakelite block 7 are axially displaced inward, they are used to assemble the thin-walled part 1 by interference fit on the mandrel 2. Similarly, when the positioning sleeve 5 and the positioning sleeve bakelite block 6 are axially displaced outward, they are used to remove the thin-walled part 1 by interference fit on the mandrel 2.

It can be seen that by adopting the rotary operation and the axial micro-displacement of the disassembly and assembly mechanism, the interference fit disassembly and assembly operation of the parts can be stably, reliably, concentrically, efficiently and simply achieved. The design structure is simple, but it effectively simplifies the clamping difficulty of the interference fit, while ensuring the processing accuracy and improving the processing efficiency.

(As shown in FIG1 ) In the above embodiment, further: the thin-walled part 1 referred to in the present invention is a flexible wheel of a harmonic reducer; the flexible wheel is a thin-walled cup-shaped flexible wheel, and the thin-walled cup-shaped flexible wheel comprises a hollow thin-walled cylindrical flexible wheel body 101, one end of the flexible wheel body 101 is provided with a flexible wheel flange 102; the outer circle of the other end of the flexible wheel body 101 is provided with a flexible wheel gear ring 103; wherein the ratio of the diameter D1 of the inner hole 104 of the cylinder of the flexible wheel body 101 to the wall thickness of the flexible wheel body 101 is greater than 110.

(As shown in Figure 3) Step S2, use the core fastening screw 4 to first coaxially fasten the core 3 and the core shaft 2 into one; then clamp and fix the outer circle C0 of the cylindrical clamping end 301 at the axial end of the core 3 on the CNC lathe to install the thin-walled part outer circle processing tooling in place.

The size L5 of the core 3 must be larger than the axial length of the size L2 of the large thin-walled part 1 to ensure smooth removal of the part after the outer circle machining of the thin-walled part 1 is completed.

The core 3 size C1 and the mandrel 3 size C2 can be designed to be clearance-matched for easy disassembly and assembly; and the clearance should be small enough to ensure the coaxiality of the mandrel and the core. Preferably, the outer circle C0 tolerance of the core 3 is h6, which is the reference for the tooling support positioning assembly.

Step S3, align the outer circle H2 201 of the mandrel 2 so that the circular runout of the outer circle of the mandrel 2 meets the process requirements. If the circular runout of the outer circle of the mandrel 2 does not meet the process requirements, loosen the core fastening screw 4 and withdraw the core fastening screw 4 from the core fastening screw installation hole formed on the end surface of the mandrel 2, manually rotate and adjust the mandrel 2 until the circular runout of the outer circle of the mandrel 2 meets the requirements, and re-tighten the core fastening screw 4.

In the above embodiment, preferably: the outer circle H2 of the core shaft 2 has a circular runout of no more than 0.010 mm.

Step S4, use a spanner to coaxially screw and fit the positioning sleeve 5 on the fine-pitch external thread rod 3a formed at the other end of the shaft end of the core 3, until the positioning sleeve 5 is screwed into the concave step hole 202 formed at the center of the outer side of the core shaft 2, and the vertical concave reference positioning surface F 2021 at the limit position of the concave step hole 202 is close to the inner side shaft end surface of the positioning sleeve 5; and the positioning sleeve bakelite block 6 is mounted on the outer side step shaft end surface 501 of the positioning sleeve 5. That is, the disassembly mechanism is pre-installed on the tooling, and the disassembly operation of the disassembly mechanism is convenient.

Step S5: Use a self-made compression nut 8 and a nut bakelite block 7 on the outer shaft of the mandrel 2 to coaxially install the thin-walled part 1 on the mandrel 2 with interference fit. To solve the problem of difficulty in installing the part with interference fit on the mandrel:

In the above embodiment, further: step S5 includes the following steps:

Step S501, align the open end of the cylinder inner hole 104 of the flexible wheel body 101 of the thin-walled part 1 toward the axial end vertical reference positioning surface G204 of the core shaft 2, so that the cylinder inner hole 104D1 is placed on the outer end of the outer circle H2 of the core shaft 2, that is, the head recognition operation is realized.

Step S502 , installing a compression nut bakelite block 7 on the vertical shaft end surface outside the flexible wheel flange 102 of the thin-walled part 1 .

Step S503: Use a wrench to screw and fit the self-made clamping nut 8 onto the fine-pitch external threaded rod 302 3a at the axial end of the core 3.

Step S504, rotate the self-made clamping nut 8, and fit the inner vertical shaft end face of the self-made clamping nut 8 with the outer vertical shaft end face of the nut bakelite block 7, so as to push the clamping nut bakelite block 7 to axially displace, until the clamping nut bakelite block 7 pushes the thin-walled part 1 to axially displace, and presses and fixes the thin-walled part 1 tightly on the vertical reference positioning surface G at the axial end of the core shaft 2. At this point, the thin-walled part 1 is clamped in place with a concentric interference fit on the outer circle H2 of the core shaft 2.

It can be seen that the interference fit installation of the thin-walled part 1 of the present invention and the outer circle H2 of the core shaft 2 effectively expands the inner hole 104 of the cylinder of the thin-walled part 1, namely D1, to prevent the outer circle of the part from being deformed during processing.

Step S6, turning the outer circle of the thin-walled part 1. In the process of machining the outer circles D2 and D3 of the thin-walled parts, the inner hole B1 of the thin-walled part 1 and the outer circle B2 of the mandrel 2 are interference fit, so the supporting mechanism and the disassembly mechanism are also connected to the thin-walled part 1 as a whole, ensuring that the thin-walled part 1 will not be deformed too much during the turning process.

(Combined with FIG. 6 and FIG. 7) To ensure turning accuracy: In the above embodiment, further: In step S6, the trajectory of the turning tool is from the axial outer side to the axial inner side of the thin-walled part 1. That is, the trajectory of the tool during the turning process is A→B (circular arc)→C→D (circular arc)→E.

The turning process of the outer circle D2 of the thin-walled part 1 flexible wheel body 101 and the turning process of the outer circle D3 of the thin-walled part 1 flexible wheel gear ring 103 are four times: that is, when the blanks of the outer circle D2 and the outer circle D3 have a reserve of 0.25mm respectively, the turning processing of the outer circle D2 and the outer circle D3 is divided into four feed adjustment processing: the first feed is 0.05mm/r, the second feed is 0.05mm/r, the third feed is 0.02mm/r, and the fourth feed is 0.005mm~0.01mm/r, until the turning processing is completed.

Among them, the fourth feed should be adjusted according to the actual measured outer circle size to meet the outer circle size requirements of thin-walled parts D2 (ф203.4h7mm) and D3 (ф206.972h6mm). In addition, the inspection of the D2 and D3 dimensions of thin-walled parts needs to be carried out on the equipment to ensure that the inspection data is consistent with the processing status.

Step S7, after the processing of the outer circles D2 and D3 of the thin-walled part 1 is completed, the homemade clamping nut 8 and the clamping nut bakelite block 7 are disassembled in sequence, and then the positioning sleeve 5 and the positioning sleeve bakelite block 6 are used to disassemble the processed thin-walled part 1.

To solve the problem of difficulty in disassembling parts with interference fit on the core shaft: In the above embodiment, further: In step S7, the method for disassembling the processed thin-walled part 1 on the core shaft 2 with coaxial interference fit therewith is as follows: After the homemade clamping nut 8 and the clamping nut bakelite block 7 are removed successively, use a wrench to rotate the protruding end 502 of the positioning sleeve 5, so that the outer step shaft end face 501 of the positioning sleeve 5 pushes the positioning sleeve bakelite block 6 to move axially outward, and the outer shaft end face of the positioning sleeve bakelite block 6 that is displaced axially outward is attached to the inner shaft end face of the flexible wheel flange 102 of the thin-walled part 1, pushing the thin-walled part 1 to move axially outward in a wear-resistant manner until the thin-walled part 1 is completely separated from the core shaft 2, thereby completing the disassembly of the thin-walled part 1 from the core shaft 2.

It should be noted that all bakelite block structures are used to prevent steel parts from contacting and being damaged. They are two specially designed protective parts to reduce wear and vibration, thereby further increasing the service life of the tooling.

Step S8, repeating steps S5, S6 and S7, i.e. reassembling new parts to be processed, and disassembling the newly processed parts after the new parts are processed; repeating this process, repeatedly using the same tooling, and realizing batch processing of thin-walled parts 1.

It can be seen that the disassembly tool composed of the positioning sleeve 5 and the positioning sleeve bakelite block 6 of the present invention; and the clamping tool composed of the clamping nut bakelite block 7 and the homemade clamping nut 8; the disassembly tool and the clamping tool both fit and contact the workpiece through the bakelite block structure; the bakelite block design facilitates the reuse of tooling, is used to reduce wear and vibration, and solves the problem of severe wear of existing thin-walled parts and loading and unloading tooling.

The present invention also includes a tool for processing the outer diameter of thin-walled parts, which consists of a core 3, a core shaft 2, a core fastening screw 4, a positioning sleeve 5, a positioning sleeve bakelite block 6, a clamping nut bakelite block 7, and a homemade clamping nut 8 assembled in sequence on a CNC lathe.

One end of the core 3 is provided with a cylindrical clamping end 301, which is used to coaxially clamp the core 3 on a numerically controlled lathe to ensure clamping accuracy and improve clamping speed.

The core 3 is provided with a mounting flange 303 in the middle of the shaft, which facilitates the coaxial connection between the core and the mandrel. That is, the mounting flange 303 uses the core fastening screw 4 to coaxially fasten the core 3 and the mandrel 2 into one.

The other end of the core 3 is provided with a fine pitch external thread rod 302, which extends from the inner side of the mandrel 2 to the outer side of the mandrel 2. The fine pitch thread design effectively improves the clamping accuracy of parts and the stability of assembly and disassembly of parts.

When in use, the present invention adopts a simple rotating operation, which works together with the design of the fine-pitch external threaded rod 302, which can not only realize the interference fit installation of the part on the core shaft 2, but also makes the clamping operation of the part 1 on the tooling simple and convenient, which is beneficial to improving the processing efficiency; and the fine-pitch external threaded rod 302 can effectively improve the coaxial positioning accuracy of the part and the tooling, so that the coaxial fit of the part and the tooling core shaft is tight and stable.

The center of the outer side of the shaft end of the mandrel 2 is formed with a concave step hole 202; the concave step hole 202 is used to accommodate one end of the positioning sleeve 5 and the positioning sleeve bakelite block 6.

The other end of the positioning sleeve 5 extends out from the concave step hole 202 in the core shaft 2, and the extended end of the positioning sleeve 5 is used to facilitate the rotating operation of the wrench.

The positioning sleeve 5 is screwed with the fine-pitch external thread rod 302 to be installed in the concave step hole 202, that is, the tooling is designed to be compact.

The outer step shaft end face 501 of the positioning sleeve 5 accommodated in the concave step hole 202 is provided with a positioning sleeve bakelite block 6. The positioning sleeve bakelite block 6 is installed on the working surface of the positioning sleeve 5 to prevent the tooling from wearing the parts.

The outer axial end surface of the mandrel 2 and the outer cylindrical surface are both concentrically interference fit to install the open end of the cylindrical flexible wheel body 101 of the thin-walled part 1. That is, the tooling is full of the part flexible wheel body 101 to achieve the recognition.

The outer axial end surface of the core shaft 2 is closely attached to the inner axial end surface of the flexible spline body 101, and the core shaft 2 is made to fill the flexible spline body 101, so as to prevent the deformation of the part when the outer circle of the part is turned.

The outer axial end surface of the flexible wheel flange 102 of the thin-walled part 1 is provided with a nut bakelite block 7; similarly, the nut bakelite block 7 is used for vibration reduction and also for preventing the tooling from wearing the parts.

A self-made clamping nut 8 is provided on the outer axial end surface of the nut bakelite block 7; the self-made clamping nut 8 is screwed to fit the fine-pitch external threaded rod 302; when the self-made clamping nut 8 and the nut bakelite block 7 are axially displaced inward, they are used to assemble the thin-walled part 1 on the core shaft 2 by interference fit. It can be seen that the use of a screwing method to axially compress and install the parts by interference fit makes the interference fit installation operation of the parts simpler, more stable and efficient.

That is, when the positioning sleeve 5 and the positioning sleeve bakelite block 6 are axially rotated and displaced outward, the positioning sleeve 5 and the positioning sleeve bakelite block 6 with axial micro-displacement are used to remove the thin-walled part 1 with interference fit on the core shaft 2, making the interference fit removal operation simple and easy.

In the above embodiment, further: the mandrel 2 is a cast iron mandrel; the core 3 is a steel core. When the tooling parts are made of the above materials, the tooling is more durable.

The mandrel 2, core 3, positioning sleeve 5, and self-made clamping nut 8 are all high-hardness, non-wearable parts that have undergone heat treatment and aging treatment, which extend the life of the tooling and are suitable for repeated use.

The center of the mandrel 2 is provided with a weight-reducing hole 203. The tooling is designed as a hollow structure to solve the problem that the original tooling is heavy and inconvenient for one person to disassemble and assemble.

In the above embodiment, further: the outer diameter of the self-made clamping nut 8 and the nut bakelite block 7 clamping working end surface is less than or equal to the outer diameter of the flexible wheel flange 102 of the thin-walled part 1.

It can be seen that the outer diameter of the homemade clamping nut 8 is not larger than the outer diameter of the flexible wheel flange 102 of the thin-walled part 1. When the homemade clamping nut 8 axially clamps the workpiece 1, the edge deformation of the flexible wheel flange 102 is prevented.

(As shown in Figure 5) In the above embodiment, further: the end 502 of the positioning sleeve 5 extending from the concave step hole 202 formed on the core shaft 2, and the outer non-working shaft end surface of the self-made clamping nut 8 are respectively formed with a square handle 9; the size D7 of the square handle 9 is compatible with the size of the wrench and D6.

(Combined with Figure 3 and Figure 6) Take the installation of the self-made clamping nut 8 as an example: During installation, the wrench needs to be clamped on the D7 flat head structure on both sides of the self-made clamping nut 8, and it needs to be manually rotated and slowly screwed in until the reference E end face of the thin-walled part 1 is firmly attached to the reference G end face of the core shaft 2. At this time, it is proved that the thin-walled part 1 has been installed in place.

(As shown in Figures 1, 3, and 7) In the above embodiment, further: the outer end face edge of the core shaft 2 is formed with a fillet R2; the inner end face corner of the flexible wheel body 101 of the thin-walled part 1 is formed with a fillet R1; a gap is left between the fillet R2 and the fillet R1.

It can be seen that there is a gap between the edge fillet R2 of the mandrel 2 and the inner fillet R1 of the flexible wheel body 101 of the thin-walled part 1, so that the thin-walled part 1 can be easily disassembled after the outer circle turning is completed, thereby reducing the deformation of the part.

Through the above description, it can be found that: the split hollow structure tooling of the present invention realizes machining by turning instead of grinding, thus saving time and cost and improving efficiency; the tooling structure is simple, convenient for machining and manufacturing, has excellent processability, can be reused, is economical and practical, and is suitable for popularization and promotion. The present invention expands the scope of external cylindrical machining of thin-walled parts, and can process thin-walled parts such as 120-type flexible wheels, 160-type flexible wheels, and 250-type flexible wheels, with good processability and high qualified rate.

In summary, the present invention adopts a special split hollow protective anti-wear tooling with a purely mechanical structure, and replaces grinding with turning to achieve the purpose of saving time and cost, and solve the technical problems of the existing flexible wheel processing, which is labor-consuming, time-consuming and labor-intensive. The tooling of the present invention has a simple design structure, light weight, and excellent anti-wear effect; the assembly and disassembly of parts from the tooling are simple, stable and efficient; the parts are not deformed, and the processing efficiency is high; the tooling is reusable, economical and practical; stable, reliable and efficient, and suitable for popularization and promotion.

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.

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, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (9)

1. The method for processing the outer circle of the thin-wall part, the method is characterized in that: an excircle machining tool of a thin-wall part with a split hollow structure and wear resistance is used; after the outer circle processing tool of the thin-wall part is clamped on a numerical control lathe, a self-made compression nut (8) and a compression nut glue wood block (7) in the outer circle processing tool of the thin-wall part are used, the thin-wall part (1) to be processed is clamped and fixed on the tool in a concentric interference fit manner in a rotary axial displacement compression mode, and the tool is fully supported with the thin-wall part (1) from the inside to prevent the thin-wall part from deforming; after the thin-wall part is machined, a locating sleeve (5) and a locating sleeve rubber wood block (6) in an excircle machining tool of the thin-wall part are used, and the machined thin-wall part (1) is removed from the tool in a rotary axial displacement reverse pushing and withdrawing mode; re-clamping a new thin-wall part (1) to be processed, and disassembling the new thin-wall part after the new thin-wall part is processed, so that batch processing of the thin-wall part (1) is completed in a reciprocating manner;

the method comprises the following steps:

S1, machining and manufacturing a mandrel (2), a core (3), a positioning sleeve (5), a positioning sleeve rubber wood block (6), a compression nut rubber wood block (7) and a self-made compression nut (8) of a thin-wall part excircle machining tool;

s2, a core (3) and a mandrel (2) are coaxially fastened and connected into a whole by using a core fastening screw (4), and then an outer circle C0 of a cylindrical clamping end (301) at the shaft end of the core (3) is clamped and fixed on a numerical control lathe so as to install a thin-wall part outer circle machining tool in place;

S3, aligning the outer circle H2 (201) of the mandrel (2) to enable the circle runout of the outer circle of the mandrel (2) to meet the process requirement; if the circle runout of the outer circle of the mandrel (2) does not meet the process requirement, loosening the core fastening screw (4) and manually rotating the adjusting mandrel (2) after the core fastening screw (4) is withdrawn from a core fastening screw mounting hole formed in the shaft end surface of the mandrel (2) until the circle runout of the outer circle of the mandrel (2) meets the requirement, and re-fastening the core fastening screw (4);

S4, coaxially screwing a locating sleeve (5) on a fine tooth external threaded rod (302) 3a which is arranged at the other end of the shaft end of the core (3) by using a spanner until the locating sleeve (5) is screwed into an inward concave stepped hole (202) which is arranged at the center of the outer side of the mandrel (2), and enabling a vertical inward concave reference locating surface F (2021) at the limit position of the inward concave stepped hole (202) to be stuck on the end face of the inner side shaft of the locating sleeve (5); a step shaft end surface (501) provided with a positioning sleeve (5) is sleeved with a positioning sleeve rubber wood block (6);

S5, coaxially and interference-fitting a self-made compression nut (8) and a nut glue wood block (7) on the outer shaft body of the mandrel (2) to install the thin-wall part (1);

s6, turning an outer circle of the thin-wall part (1);

s7, sequentially disassembling the self-made compression nut (8) and the compression nut glue wood block (7), and disassembling the processed thin-wall part (1) by using the positioning sleeve (5) and the positioning sleeve glue wood block (6);

s8, repeating the step S5, the step S6 and the step S7, and processing the thin-wall parts (1) in batches;

The outer circle processing tool for the thin-wall part consists of a core (3), a mandrel (2), a core fastening screw (4), a positioning sleeve (5), a positioning sleeve rubber wood block (6), a compression nut rubber wood block (7) and a self-made compression nut (8) which are sequentially assembled on a numerical control lathe; one end of the shaft end of the core (3) is provided with a cylindrical clamping end (301); the cylindrical clamping end (301) is used for coaxially clamping and fixing the core (3) on the numerical control lathe; the middle part of the shaft body of the core (3) is provided with a mounting flange (303); the mounting flange (303) uses a core fastening screw (4) to coaxially fasten the core (3) and the mandrel (2) into a whole; the other end of the shaft end of the core (3) is provided with a fine tooth external threaded rod (302), and the fine tooth external threaded rod (302) extends from the inner side of the mandrel (2) to the outer side of the shaft end of the mandrel (2); an inward concave stepped hole (202) is formed in the center of the outer side of the shaft end of the mandrel (2); the concave step hole (202) is used for accommodating one end of the positioning sleeve (5) and the bakelite block (6) of the positioning sleeve; the other end of the positioning sleeve (5) extends out of the concave stepped hole (202) of the mandrel (2); the positioning sleeve (5) is screwed with the fine-tooth external threaded rod (302) to be installed in the concave stepped hole (202); the outer step shaft end face (501) of the positioning sleeve (5) accommodated in the inner concave step hole (202) is provided with a positioning sleeve rubber wood block (6); the end face of the outer shaft of the mandrel (2) is concentrically and in interference fit with the open end of a cylindrical flexible gear body (101) of the thin-wall part (1); the end face of the outer side shaft of the mandrel (2) is stuck to the end face of the inner side shaft of the flexible gear body (101), and the mandrel (2) is used for filling the flexible gear body (101); the end face of the outer side shaft of the flexible gear flange (102) of the thin-wall part (1) is provided with a nut rubber wood block (7); the end face of the outer shaft of the nut glue block (7) is provided with a self-made compression nut (8); the self-made compression nut (8) is screwed to be matched with the fine-tooth external threaded rod (302); the self-made compression nut (8) and the nut glue wood block (7) are used for assembling the thin-wall part (1) in interference fit when the mandrel (2) is displaced axially inwards; and the positioning sleeve (5) and the positioning sleeve rubber wood block (6) are used for removing the interference fit thin-wall part (1) when the mandrel (2) is axially displaced outwards.

2. The method for processing the outer circle of the thin-walled part according to claim 1, wherein the method comprises the following steps: the thin-wall part (1) is a flexible gear of a harmonic reducer; the flexible gear is a thin-wall cup-shaped flexible gear, the thin-wall cup-shaped flexible gear comprises a hollow thin-wall cylindrical flexible gear body (101), and a flexible gear flange (102) is formed at one end of the flexible gear body (101); a flexible gear ring (103) is arranged on the outer circle of the other end of the flexible gear body (101); wherein the ratio of the diameter D1 of the inner hole (104) of the cylinder body of the flexible gear body (101) to the wall thickness of the flexible gear body (101) is more than 110.

3. The method for processing the outer circle of the thin-walled part according to claim 1, wherein the method comprises the following steps: step S5 comprises the steps of:

S501, enabling an open end of a cylinder inner hole (104) of a flexible gear body (101) of the thin-wall part (1) to face a shaft end vertical reference positioning surface G (204) of a mandrel (2) so as to enable the cylinder inner hole (104) D1 to be lapped on the outer side end part of an excircle H2 (201) of the mandrel (2);

S502, mounting a compression nut glue wood block (7) on the outer vertical shaft end surface of the flexible wheel flange (102) of the thin-wall part (1);

S503, screwing a self-made compression nut (8) on a fine tooth external threaded rod (302) 3a at the shaft end of the core (3) by using a spanner;

S504, rotating the self-made compression nut (8), attaching the inner vertical shaft end surface of the self-made compression nut (8) to the outer vertical shaft end surface of the nut glue block (7) for pushing the axial displacement of the compression nut glue block (7) until the compression nut glue block (7) pushes the thin-wall part (1) to axially displace, and tightly compacting and fixing the thin-wall part (1) on the vertical shaft end reference positioning surface G (204) of the mandrel (2), so that the thin-wall part (1) is clamped in place on the outer circle H2 (201) of the mandrel (2) in a concentric interference fit manner.

4. The method for processing the outer circle of the thin-walled part according to claim 1, wherein the method comprises the following steps:

In the step S6, the track of the turning tool is from the outer side to the inner side of the thin-wall part (1) in the axial direction; turning process of excircle D2 of flexible gear body (101) of thin-wall part (1) and turning process of excircle D3 of flexible gear ring (103) of thin-wall part (1), when excircle D2 and excircle D3's blank had 0.25mm volume respectively, the turning of excircle D2 and excircle D3 equally divide four times feed volume adjustment processing: the first feeding amount is 0.05mm/r, the second feeding amount is 0.05mm/r, the third feeding amount is 0.02mm/r, and the fourth feeding amount is 0.005 mm-0.01 mm/r; in the step S7, the method for detaching the processed thin-wall part (1) on the mandrel (2) in coaxial interference fit with the thin-wall part is as follows: when self-made gland nut (8) and gland nut bakelite block (7) are removed successively, a spanner is used for rotating the extending end (502) of the positioning sleeve (5), so that the outer step shaft end face (501) of the positioning sleeve (5) pushes the positioning sleeve bakelite block (6) to displace axially outwards, the outer side shaft end face of the positioning sleeve bakelite block (6) displaced axially outwards is attached to the inner side shaft end face of the flexible wheel flange (102) of the thin-wall part (1), the thin-wall part (1) is pushed to displace axially outwards until the thin-wall part (1) is completely separated from the mandrel (2), and the thin-wall part (1) is detached from the mandrel (2).

5. The thin-walled part outer circle processing tool used in the thin-walled part outer circle processing method according to any one of claims 1 to 4, wherein: the outer circle processing tool for the thin-wall part consists of a core (3), a mandrel (2), a core fastening screw (4), a positioning sleeve (5), a positioning sleeve rubber wood block (6), a compression nut rubber wood block (7) and a self-made compression nut (8) which are sequentially assembled on a numerical control lathe;

One end of the shaft end of the core (3) is provided with a cylindrical clamping end (301); the cylindrical clamping end (301) is used for coaxially clamping and fixing the core (3) on the numerical control lathe; the middle part of the shaft body of the core (3) is provided with a mounting flange (303); the mounting flange (303) uses a core fastening screw (4) to coaxially fasten the core (3) and the mandrel (2) into a whole; the other end of the shaft end of the core (3) is provided with a fine tooth external threaded rod (302), and the fine tooth external threaded rod (302) extends from the inner side of the mandrel (2) to the outer side of the shaft end of the mandrel (2); an inward concave stepped hole (202) is formed in the center of the outer side of the shaft end of the mandrel (2); the concave step hole (202) is used for accommodating one end of the positioning sleeve (5) and the bakelite block (6) of the positioning sleeve; the other end of the positioning sleeve (5) extends out of the concave stepped hole (202) of the mandrel (2); the positioning sleeve (5) is screwed with the fine-tooth external threaded rod (302) to be installed in the concave stepped hole (202); the outer step shaft end face (501) of the positioning sleeve (5) accommodated in the inner concave step hole (202) is provided with a positioning sleeve rubber wood block (6); the end face of the outer shaft of the mandrel (2) is concentrically and in interference fit with the open end of a cylindrical flexible gear body (101) of the thin-wall part (1); the end face of the outer side shaft of the mandrel (2) is stuck to the end face of the inner side shaft of the flexible gear body (101), and the mandrel (2) is used for filling the flexible gear body (101); the end face of the outer side shaft of the flexible gear flange (102) of the thin-wall part (1) is provided with a nut rubber wood block (7); the end face of the outer shaft of the nut glue block (7) is provided with a self-made compression nut (8); the self-made compression nut (8) is screwed to be matched with the fine-tooth external threaded rod (302); the self-made compression nut (8) and the nut glue wood block (7) are used for assembling the thin-wall part (1) in interference fit when the mandrel (2) is displaced axially inwards; and the positioning sleeve (5) and the positioning sleeve rubber wood block (6) are used for removing the interference fit thin-wall part (1) when the mandrel (2) is axially displaced outwards.

6. The thin-walled part outer circle machining tool according to claim 5, wherein: the mandrel (2) is a cast iron mandrel; the core (3) is a steel core; the mandrel (2), the core (3), the positioning sleeve (5) and the self-made compression nut (8) are all high-hardness parts which are not easy to wear after heat treatment and aging treatment; the circle runout of the excircle H2 (201) of the mandrel (2) is not more than 0.010mm; the center of the mandrel (2) is provided with a lightening hole (203).

7. The thin-walled part outer circle machining tool according to claim 5, wherein: the outer diameter of the self-made compression nut (8) and the nut glue wood block (7) compression working end face is smaller than or equal to the outer diameter of the flexible wheel flange (102) of the thin-wall part (1).

8. The thin-walled part outer circle machining tool according to claim 5, wherein: the positioning sleeve (5) is provided with an extending end (502) from a concave step hole (202) formed in the mandrel (2), and square handles (9) are respectively formed on the outer side non-working shaft end surfaces of the self-made compression nuts (8); the size of the square handle (9) is matched with the working size of the wrench.

9. The thin-walled part outer circle machining tool according to claim 5, wherein: the edge of the end face of the outer side shaft of the mandrel (2) is provided with a round angle R2; a fillet R1 is formed in the corner of the end face of the inner shaft of the flexible gear body (101) of the thin-wall part (1); and a gap is reserved between the round corner R2 and the round corner R1.