CN217291488U - Thin-wall part excircle machining tool - Google Patents

Abstract

The tool for machining the outer circle of the thin-wall part comprises a core, a core shaft, a core fastening screw, a positioning sleeve bakelite block, a compression nut bakelite block and a self-made compression nut which are sequentially assembled on a numerically controlled lathe; the core is used for fixing the tool on a lathe; a core shaft is arranged on the outer side of the core; the outer side of the mandrel is filled with thin-wall parts in interference fit; the core is screwed with the positioning sleeve and the self-made compression nut in sequence through the fine-tooth external thread rod; the working surfaces of the positioning sleeve and the self-made compression nut are respectively provided with a bakelite block; the self-made compression nut and the nut bakelite block are used for axially compressing and fixing the thin-wall part; the positioning sleeve and the positioning sleeve bakelite block are used for dismantling the thin-wall part. By adopting the technical scheme of the utility model, the tool has simple design structure, light dead weight and excellent anti-abrasion effect; the assembly and disassembly operations of the parts from the tool are simple, stable and efficient; the parts are not deformed, and the machining efficiency is high; the tool can be repeatedly used, is economical, practical, stable, reliable and efficient, and is suitable for popularization and promotion.

Description

Thin wall part excircle processing frock

Technical Field

The utility model belongs to the technical field of mechanical engineering transmission part flexbile gear, concretely relates to thin wall part excircle processing frock.

Background

With the development and progress of social technology, the harmonic reducer is widely applied to the special fields of unmanned aerial vehicles, radar antennas, rocket engines, robot joints and the like due to the characteristics of compact structure, large reduction ratio, large bearing torque and the like. Wherein, the flexspline is the key part of harmonic reducer ware. However, the flexible gear with a thin-wall structure is easy to deform and has high processing difficulty, and is a typical representative of thin-wall parts.

The utility model discloses use processing as shown in fig. 1 200 type thin wall cup-shaped flexbile gear as an example, thin wall cylinder flexbile gear body hole diameter is D1 (phi 200H6mm), barrel axial depth is L1, barrel axial length is L2, barrel excircle is D2, ring gear excircle is D3, flexbile gear total axial length is L2; wherein, the ratio of the flexspline inner hole diameter D1 to the flexspline body wall thickness is greater than 110.

In the prior art, a process method for processing an outer circle of a 200-type thin-wall cup-shaped flexible gear shown in fig. 1 is grinding: during grinding, a mandrel support in interference fit with the inner hole D1 of the 200-type flexible gear is used for grinding the excircle, and the grinding time is long; moreover, because the size of the 200-type flexible gear part is larger, the size of the excircle grinding mandrel matched with the flexible gear part is larger, and the self weight is too high, the assembly and disassembly of the flexible gear part and the mandrel are troublesome, and the flexible gear part and the mandrel can be completed only by matching two persons; moreover, the problems of serious abrasion of the core shaft and inconvenient assembly and disassembly exist, so that the excircle processing of the flexible gear becomes labor-consuming, time-consuming and labor-consuming, and the efficiency is lower. In view of this, the following improvement is proposed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem: the utility model provides a thin wall part excircle processing frock adopts purpose-made split type hollow protection nature abrasionproof to turning replaces abrasive machining, reaches the purpose of save time and cost, and solves current flexbile gear processing and takes a lot of work, wastes time, hard technical problem.

The utility model adopts the technical proposal that: the tool for machining the excircle of the thin-wall part comprises a core, a mandrel, a core fastening screw, a positioning sleeve bakelite block, a compression nut bakelite block and a self-made compression nut which are sequentially assembled on a numerically controlled lathe; the tool is coaxially and fixedly arranged on the numerical control lathe through one end of the shaft end of the core; a mandrel is coaxially and fixedly arranged on the outer side of the middle part of the core shaft body; the thin-wall part is coaxially arranged on the outer side of the mandrel in an interference fit manner, and the hollow structure of the thin-wall part is filled in the shaft body of the mandrel; the other end of the core shaft is provided with a fine-tooth external thread rod; the fine-tooth external thread rod is used for sequentially screwing, adapting and installing the positioning sleeve and the self-made compression nut; the outer working surface of the shaft end of the positioning sleeve is provided with a positioning sleeve bakelite block; a nut bakelite block is arranged on the inner working surface of the shaft end of the self-made compression nut; the self-made compression nut and the nut bakelite block are used for pushing the thin-wall part axially inwards so as to connect the thin-wall part and the mandrel into a whole in a coaxial interference fit manner; the positioning sleeve and the positioning sleeve bakelite block are used for pushing the thin-wall part outwards in the axial direction in a reverse direction so as to remove the thin-wall part from the mandrel.

In the above technical solution, further: the thin-wall part is a flexible gear of the 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, and one end of the flexible gear body is provided with a flexible gear flange; the outer circle of the other end of the flexible gear body is provided with a flexible gear ring; wherein the ratio of the diameter D1 of the inner hole of the cylinder body of the flexible gear body to the wall thickness of the flexible gear body is more than 110.

In the above technical solution, further: the external thread rod with the fine teeth extends from the inner side of the mandrel to the outer side of the shaft end of the mandrel; the center of the outer side of the shaft end of the mandrel is provided with a concave stepped hole; the concave stepped hole is used for accommodating one end of the positioning sleeve and the positioning sleeve bakelite block; the other end of the positioning sleeve extends out of the concave stepped hole of the mandrel; the outer side of the positioning sleeve accommodated in the concave step hole is provided with a step shaft end surface; the end surface of the step shaft is provided with a positioning sleeve bakelite block.

In the above technical solution, further: the outer diameter of the self-made compression nut and the nut bakelite block for compressing the working end face is less than or equal to the outer diameter of a flexible gear flange made of a thin-wall part.

In the above technical solution, further: the center of the mandrel is provided with a lightening hole.

In the above technical solution, further: the core shaft is a cast iron core shaft; the core is a steel core; the core shaft, the core, the positioning sleeve and the self-made compression nut are high-hardness parts which are subjected to heat treatment and aging treatment and are not easy to wear.

In the above technical solution, further: the rotating ends of the positioning sleeve and the self-made compression nut are respectively provided with a square handle; the size of the square handle is matched with the working size of the wrench.

In the above technical solution, further: the edge of the end surface of the shaft outside the mandrel is provided with a round angle R2; a round corner R1 is formed at the corner of the end surface of the inner side shaft of the flexible gear body of the thin-wall part; when the thin-wall part is connected with the mandrel in a coaxial interference fit mode, a gap is reserved between the fillet R2 and the fillet R1.

In the above technical solution, further: one end of the shaft end of the core is provided with a cylindrical clamping end; the cylindrical clamping end is used for fixedly and coaxially mounting the core and the tool on the numerically controlled lathe.

In the above technical solution, further: the middle part of the core shaft body is provided with an installation flange; the mounting flange uses a core fastening screw to coaxially fasten and connect the core and the core shaft into a whole.

Compared with the prior art, the utility model advantage:

1. the utility model discloses a pure mechanical type components of a whole that can function independently hollow structure's frock design, single-operator can accomplish the loading and unloading of frock on numerical control lathe, and it is big partially to solve current frock dead weight, inconvenient dismantlement clamping's technical problem, and frock structure easy operation, economical and practical.

2. The utility model discloses a disassembling tool composed of a positioning sleeve and a positioning sleeve bakelite block; the clamping tool consists of a compression nut bakelite block and a self-made compression nut; the disassembling tool and the clamping tool are attached to and contact with a workpiece through a bakelite block structure, the bakelite block is designed, two specially-designed protection parts for preventing a steel part from being damaged by contact and collision with the steel part are convenient to use repeatedly, the abrasion and the vibration are reduced, and the problem that the existing thin-wall part and the loading and unloading tool are seriously abraded is solved.

3. The utility model adopts simple rotating operation, and cooperates with the design of the external thread rod with the fine teeth to realize the interference fit installation of the tool on the mandrel, so that the clamping operation of the workpiece on the tool is simple and convenient, and the processing efficiency is favorably improved; and the external thread rod with the fine teeth can effectively improve the coaxial positioning precision, the parts are tightly matched with the mandrel in a coaxial way, and the stability of interference fit assembly is good.

4. The thin-wall part and the mandrel are arranged in interference fit, so that the inner hole of the barrel body of the thin-wall part is effectively opened, and the processing deformation of the excircle of the part is prevented; the outer diameter of the self-made compression nut is not larger than that of the flange of the flexible gear of the thin-wall part, and when the self-made compression nut axially compresses a workpiece, the problem of deformation of the outer side of the flange of the flexible gear is prevented; a gap is reserved between the fillet R2 at the edge of the mandrel and the fillet R1 at the inner side of the flexible gear body, so that the thin-wall part is easy to disassemble after the excircle turning is finished, and the method is also used for reducing the deformation of the part.

5. The utility model discloses split type hollow structure's frock realizes replacing the mill processing with the car, reaches the purpose of saving time and cost, raising the efficiency; the tool design of the pure mechanical structure is simple in structure, convenient to process and manufacture, excellent in manufacturability, reusable, economical and practical, and suitable for popularization and promotion.

Drawings

FIG. 1 is a schematic structural view of a thin-walled part according to the present invention;

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

FIG. 3 is a schematic structural view of the assembled core and mandrel;

FIG. 4 is a structural diagram of a dismounting mechanism for dismounting the thin-walled parts on the mandrel in an interference fit manner;

fig. 5 is a front view of the self-made compression nut of fig. 4 according to the present invention;

FIG. 6 is an overall assembly view of the tooling of the present invention and parts;

FIG. 7 is an enlarged detail view of section I of FIG. 6;

FIG. 8 is an enlarged detail view of section II of FIG. 6;

in the figure: 1-thin-wall part, 101-flexible gear body, 102-flexible gear flange, 103-flexible gear ring gear and 104-cylinder inner hole; 2-mandrel 2, 201-excircle H2, 202-concave stepped hole, 2021-concave reference positioning surface F, 203-lightening hole, 204-shaft end vertical reference positioning surface G; 3-a core, 301-a cylindrical clamping end, 302-a fine-tooth external thread rod and 303-a mounting flange; 4-core fastening screws; 5-a positioning sleeve, 501-a step shaft end face and 502-an extending end; 6-positioning sleeve bakelite blocks, 7-compression nut bakelite blocks, 8-self-made compression nuts and 9-square handles.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to fig. 1 to 8 of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

(as shown in figure 6) the utility model discloses a thin wall part excircle processing frock, the frock comprises core 3, dabber 2, core fastening screw 4, position sleeve 5, position sleeve bakelite piece 6, the nut bakelite piece 7 that compresses tightly, self-control gland nut 8 that assembles in proper order on the numerical control lathe.

The tool is coaxially and fixedly installed on the numerical control lathe through one end of the 3 shaft ends of the core. In the above embodiment, further: 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 fixedly mounting the core 3 and the tool on the numerical control lathe coaxially. The clamping tool is fixed by the cylindrical clamping end 301, so that the clamping precision of the tool is guaranteed, and the clamping speed is increased.

And a mandrel 2 is coaxially and fixedly arranged on the outer side of the middle part of the shaft body of the core 3. In the above embodiment, further: a mounting flange 303 is arranged in the middle of the shaft body of the core 3; the mounting flange 303 uses a core fastening screw 4 to fasten and connect the core 3 and the core shaft 2 coaxially.

On this basis, the outer side of the shaft body of the mandrel 2 is used for installing the thin-wall part 1 in a coaxial interference fit mode, and the hollow structure of the thin-wall part 1 is filled with the shaft body of the mandrel 2.

In the above embodiment, further: 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 one end of the flexible gear body 101 is provided with a flexible gear flange 102; the outer circle of the other end of the flexible gear body 101 is provided with a flexible gear ring 103; wherein the ratio of the hole diameter D1 of the cylinder inner hole 104 of the flexible gear body 101 to the wall thickness of the flexible gear body 101 is larger than 110. Namely a tool designed for the thin-walled part 1 of the structure.

The other end of the shaft end of the core 3 is provided with a fine-tooth external thread rod 302; the fine-tooth external thread rod 302 is used for installing the positioning sleeve 5 and the self-made compression nut 8 in a screwing and matching mode successively. And a fine thread design is adopted, so that the interference fit clamping precision of the part is improved, and the assembling and disassembling stability of the part is improved.

For solving the problem that the tool is easy to wear parts: a positioning sleeve bakelite block 6 is arranged on the outer working surface of the shaft end of the positioning sleeve 5; and a nut bakelite block 7 is arranged on the inner working surface of the shaft end of the self-made compression nut 8.

The nut bakelite block 7 is arranged on the shaft end face of the outer side of the flexible gear flange 102 of the thin-wall part 1; and a self-made compression nut 8 is arranged on the shaft end face of the outer side of the nut bakelite block 7.

Set up nut bakelite piece 7 is used for the damping, is used for preventing frock wearing and tearing part simultaneously.

When in use: the self-made compression nut 8 and the nut bakelite block 7 are used for pushing the thin-wall part 1 axially inwards so as to connect the thin-wall part 1 and the mandrel 2 into a whole in a coaxial interference fit manner. The positioning sleeve 5 and the positioning sleeve bakelite block 6 are used for pushing the thin-wall part 1 outwards in the axial direction in the opposite direction so as to remove the thin-wall part 1 from the mandrel 2.

Namely, the self-made compression nut 8 is screwed and matched with the external thread rod 302 with the fine teeth; and when the self-made compression nut 8 and the nut bakelite block 7 are axially displaced inwards, the self-made compression nut and the nut bakelite block are used for assembling the thin-wall part 1 on the mandrel 2 in an interference fit manner.

In the same way: when the positioning sleeve 5 and the positioning sleeve bakelite block 6 rotate and displace outwards in the axial direction, the positioning sleeve 5 and the positioning sleeve bakelite block 6 which are displaced in the axial direction in a micro-motion manner are used for removing the thin-wall part 1 in interference fit on the mandrel 2, so that the interference fit removing operation of the part on the mandrel is simple and easy to implement.

Therefore, the parts are axially compressed in a rotating mode and are installed in an interference fit mode, so that the interference fit installation operation of the parts is simpler, and the parts are stable and efficient.

It should be noted that: when the thin-wall part 1 is assembled by the self-made compression nut 8 and the nut bakelite block 7, the outer side shaft end surface of the mandrel 2 and the outer cylindrical surface of the mandrel 2 are used for mounting the open end of the cylindrical flexible wheel body 101 of the thin-wall part 1 in a concentric interference fit manner, namely, the end-recognizing operation of the shaft ends of the thin-wall part 1 and the mandrel 2 is firstly realized; then, when the parts are gradually assembled in place, the tool needs to be filled with the part flexible gear body 101. Namely, the outer side shaft end surface of the mandrel 2 is tightly attached to the inner side shaft end surface of the flexible gear body 101, and the mandrel 2 is used for filling the flexible gear body 101 so as to prevent the deformation of the part when the part is turned into the outer circle.

In the above embodiment, further: for the compact tool design, the external thread rod 302 with the fine teeth extends from the inner side of the mandrel 2 to the outer side of the shaft end of the mandrel 2; the center of the outer side of the shaft end of the mandrel 2 is provided with an inwards concave stepped hole 202; the concave stepped hole 202 is used for accommodating one end of the positioning sleeve 5 and the positioning sleeve bakelite block 6; the other end of the positioning sleeve 5 extends out of a concave stepped hole 202 in the mandrel 2; the extending end of the positioning sleeve 5 is used for facilitating the rotation operation of the wrench on the positioning sleeve 5. The positioning sleeve 5 is screwed with the external thread rod 302 with the fine teeth to be installed in the concave stepped hole 202, so that the compact design of the tool is realized.

On the basis, a step shaft end surface 501 is formed on the outer side of the positioning sleeve 5 accommodated in the concave step hole 202; the step shaft end surface 501 is provided with a positioning sleeve bakelite block 6. The positioning sleeve bakelite block 6 is arranged on the working surface of the positioning sleeve 5 to prevent the tool from wearing parts.

When the tool is used, the utility model adopts simple rotating operation and the combined action of the design of the external thread rod 302 with the fine teeth, thereby not only realizing the interference fit installation of the part on the mandrel 2, but also ensuring that the clamping operation of the part 1 on the tool is simple and convenient, and being beneficial to improving the processing efficiency; and the fine-tooth external thread rod 302 can effectively improve the coaxial positioning precision of the part and the tool, so that the part and the tool mandrel are in coaxial fit tightly, and the stability is good.

In the above embodiment, further: the outer diameter of the self-made compression nut 8 and the nut bakelite block 7 for compressing the working end face is less than or equal to the outer diameter of the flexible gear flange 102 made on the thin-wall part 1. Therefore, the outer diameter of the self-made compression nut 8 is not larger than the outer diameter of the flexible gear flange 102 of the thin-wall part 1, and when the self-made compression nut 8 axially compresses the workpiece 1, the problem of edge deformation of the flexible gear flange 102 is prevented.

In the above embodiment, further: the center of the mandrel 2 is provided with a lightening hole 203. The tool is designed to be a hollow structure, so that the problems that the original tool is heavy in assembly and inconvenient to disassemble and assemble by a single person are solved.

In the above embodiment, further: the mandrel 2 is a cast iron mandrel; the core 3 is a steel core; when the material is adopted to manufacture the tool part, the tool is more durable.

The core shaft 2, the core 3, the positioning sleeve 5 and the self-made compression nut 8 are high-hardness and wear-resistant parts subjected to heat treatment and aging treatment. The service life of the tool is prolonged, and the tool is suitable for repeated use.

In the above embodiment, further: the rotating ends of the positioning sleeve 5 and the homemade compression nut 8 are respectively provided with a square handle 9; the size of the square handle 9 is matched with the working size of the wrench.

Specifically, as shown in fig. 5, the positioning sleeve 5 extends out of an end 502 of the concave stepped hole 202 formed in the mandrel 2, and the outer non-working shaft end faces of the self-made compression nut 8 are respectively provided with a square handle 9; the square handle 9 is D7 size to match the wrench and D6 size.

(refer to fig. 3 and 6) take the installation of the self-made compression nut 8 as an example: during installation, a wrench needs to be clamped on the D7 flat head structures on two sides of the self-made compression nut 8, the wrench is manually rotated and slowly screwed in until the reference E end face of the thin-wall part 1 is tightly attached to the reference G end face of the mandrel 2, and the fact that the thin-wall part 1 is installed in place is proved.

(as shown in fig. 1, 3, and 7) in the above embodiment, further: the edge of the end face of the outer side shaft of the mandrel 2 is provided with a round angle R2; a round corner R1 is formed at the corner of the end face of the inner side shaft of the flexible gear body 101 of the thin-wall part 1; when the thin-wall part 1 and the mandrel 2 are coaxially connected into a whole in an interference fit mode, a gap is reserved between the fillet R2 and the fillet R1.

Therefore, a gap is reserved between the fillet R2 at the edge of the mandrel 2 and the fillet R1 at the inner side of the flexible gear body 101 of the thin-wall part 1, so that the thin-wall part 1 is easy to disassemble after the outer circle turning is finished, and the deformation of the part is reduced.

The thin-wall part excircle processing method of the thin-wall part excircle processing tool is as follows: the tool for machining the excircle of the thin-wall part with the abrasion-proof split hollow structure is of the split hollow structure, and the technical problems that an existing tool is heavy and inconvenient to operate and clamp by one person are solved.

After the thin-wall part outer circle machining tool is clamped on the numerical control lathe, the numerical control lathe is used for replacing grinding machining by turning machining, and machining efficiency is improved.

The self-made compression nut 8 and the compression nut bakelite block 7 in the thin-wall part excircle processing tool are used, a rotary axial displacement compression mode is adopted, the thin-wall part 1 to be processed is clamped and fixed on the tool in a concentric interference fit mode, and the tool is fully filled with the thin-wall part 1 from the inside and used for preventing the thin-wall part from deforming.

The compression nut bakelite block 7 is used for preventing the abrasion of the tool and the workpiece.

The clamping device has the advantages that the parts are clamped in a rotary axial displacement compression mode, so that the operation of interference fit installation of the parts on the tool becomes simple, and the problems that the clamping difficulty is high and the parts are easy to deform in concentric interference fit installation of the parts on the tool are solved.

After the thin-wall part is machined, the positioning sleeve 5 and the positioning sleeve bakelite block 6 in the thin-wall part excircle machining tool are used, and the machined thin-wall part 1 is detached from the tool by adopting a rotary axial displacement reverse pushing and withdrawing mode for the positioning sleeve 5 and the positioning sleeve bakelite block 6.

The same as the part installation principle, the positioning sleeve bakelite block 6 is used for preventing the tool and the part from being abraded. The machined part is disassembled in a mode of rotating axial displacement and reverse pushing and withdrawing, so that the disassembling operation of the part installed in the interference fit mode from the tool becomes simple, and the problems that the disassembling difficulty of the part and the tool in the concentric interference fit mode is high and the part is easy to deform are solved.

The method is adopted, namely, a self-made compression nut 8 and a compression nut bakelite block 7 are adopted to clamp a new thin-wall part 1 to be processed; after the parts are machined, the parts are disassembled by using the positioning sleeve 5 and the positioning sleeve bakelite block 6, and accordingly, the thin-wall parts 1 can be machined in batches.

The utility model relates to a thin wall part excircle processing method, including following step:

and step S1, processing and manufacturing the core shaft 2, the core 3, the positioning sleeve 5, the positioning sleeve bakelite block 6, the compression nut bakelite block 7 and the self-made compression nut 8 of the thin-wall part excircle processing tool. The above-mentioned parts are self-produced pieces, the dimensions of which are designed according to the thin-walled part 1.

The specific dimensional requirements of the thin-walled part 1 (as shown in fig. 1) are: the inner hole D1 is phi 200H6, the depth L1 is 181.8mm, the cylinder part outer circle D2 of the flexible gear body 101 is phi 203.4H7mm, the tooth outer circle D3 of the flexible gear ring gear 103 is phi 206.972H6mm, the length L2 is 194mm, the L3 is 183.5mm, the arm thicknesses at two positions are 1.7mm and 3.486mm respectively through calculation, the ratio of the inner hole to the wall thickness of the part is larger than 110, and the part belongs to an easily deformable part.

The thin-wall part excircle processing tool is composed of a core 3, a core shaft 2, a core fastening screw 4, a positioning sleeve 5, a positioning sleeve bakelite block 6, a compression nut bakelite block 7 and a self-made compression nut 8 which are sequentially assembled on a numerically-controlled lathe.

(as shown in fig. 2) 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 a numerical control lathe. The design of the cylindrical clamping end 301 is adopted, so that the tool can be conveniently and quickly positioned and clamped on a numerically controlled lathe with high precision.

A mounting flange 303 is arranged in the middle of the shaft body of the core 3; the mounting flange 303 fastens the core 3 and the mandrel 2 into a whole coaxially by using a core fastening screw 4 and a gasket.

It can be seen that the tool main body, namely the core 3 and the core shaft 2, is designed into a split structure, so that the split processing of the supporting structure is facilitated, the material is saved, the tool is light in weight, and the clamping of the tool can be completed by one person conveniently.

Therefore, the utility model discloses a split type to and the frock design of the dabber hollow structure of following description, the loading and unloading of frock on numerical control lathe can be accomplished in one-man operation, and it is big partially to solve current frock dead weight, inconvenient dismantlement clamping's technical problem.

The other end of the shaft end of the core 3 is provided with a fine-tooth external thread rod 302, and the fine-tooth thread design is adopted, so that the rotating operation of the positioning sleeve 5 and the self-made compression nut 8 on the fine-tooth external thread is realized, the improvement of the positioning and assembling precision of axial displacement is facilitated, and the parts are stably assembled and disassembled.

During the preparation, be equipped with internal thread 5a on the position sleeve 5, self-control gland nut 8 is equipped with internal thread 8a, and the internal thread 5a of two parts, 8a need cooperate the processing with the external screw thread 3a of core 3, guarantee that both chi of internal thread and external screw thread are fit for clearance that probably are little, and can precess smoothly, screw out does not have the jamming to the quick assembly disassembly operation of part.

Moreover, the depth of parallelism of two vertical terminal surfaces of position sleeve 5, the 8 parts of self-control gland nut is not more than 0.015mm to guarantee that after 5, the 8 rotating axial displacement of self-control gland nut installed, its and the vertical terminal surface of part are close to reality steadily.

The external thread rod 302 with the fine teeth extends from the inner side of the mandrel 2 to the outer side of the shaft end of the mandrel 2, so that the positioning sleeve 5 and the self-made compression nut 8 are assembled at the extending end.

The center of the outer side of the shaft end of the mandrel 2 is provided with an inwards concave stepped hole 202; the concave stepped hole 202 is used for accommodating one end of the positioning sleeve 5 and the positioning sleeve bakelite block 6, namely, the pre-installation of the dismounting mechanism consisting of the positioning sleeve 5 and the positioning sleeve bakelite block 6 is realized.

The other end of the positioning sleeve 5 extends out of a concave stepped hole 202 in the mandrel 2; the other end of the locating sleeve 5 extends out, so that the locating sleeve 5 can be conveniently screwed by a hand-held wrench, and the locating sleeve 5 can be rotatably disassembled. Namely, the positioning sleeve 5 is screwed on the external thread rod 302 with fine teeth to be arranged in the concave stepped hole 202.

The longitudinal section of the positioning sleeve 5 is of a T-shaped structure, and the positioning sleeve bakelite block 6 is arranged on the outer step shaft end surface 501, accommodated in the concave step hole 202, of the positioning sleeve 5. The positioning sleeve 5 is provided with a positioning block, and the positioning block is used for buffering the vibration of the processing and particularly protecting the workpiece to prevent the part from being damaged and abraded.

The end surface of the outer side shaft of the mandrel 2 and the outer cylindrical surface are concentrically and interferingly fitted with the open end of the cylindrical flexible gear body 101 of the thin-wall part 1. And the outer side shaft end surface of the mandrel 2 is tightly attached to the inner side shaft end surface of the flexible gear body 101, and the mandrel 2 is used for filling the flexible gear body 101.

The tool is used for fully supporting the inner hollow structure of the part to be machined from the inside, so that the part is prevented from being deformed when the outer circle of the part is turned, and the problem that the thin-wall part is easy to deform during machining is solved.

On the basis of the above steps: a nut bakelite block 7 is arranged on the shaft end face of the outer side of a flexible gear flange 102 of the thin-wall part 1; namely, the most firm part of the thin-walled part 1 itself, namely the flexible wheel flange 102, is used to apply an axial thrust to the part through the flexible wheel flange 102 so as to prevent the part from deforming.

A self-made compression nut 8 is arranged on the end face of the shaft outside the nut bakelite block 7; the self-made compression nut 8 is screwed and matched with the external thread rod 302 with the fine teeth; and when the self-made compression nut 8 and the nut bakelite block 7 are axially displaced inwards, the self-made compression nut and the nut bakelite block are used for assembling the thin-wall part 1 on the mandrel 2 in an interference fit manner. Similarly, when the positioning sleeve 5 and the positioning sleeve bakelite block 6 axially displace outwards, the thin-wall part 1 in interference fit is removed from the mandrel 2.

Therefore, the interference fit disassembly and assembly operation of parts can be stably, reliably, concentrically, efficiently and simply realized by adopting the rotating operation and through the axial micro-motion displacement of the disassembly and assembly mechanism. This design simple structure, but effectively simplified interference fit's the clamping degree of difficulty, guaranteed the machining precision simultaneously, improved machining efficiency.

(as shown in fig. 1) in the above embodiment, further: the thin-wall part 1 of the utility model 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 one end of the flexible gear body 101 is provided with a flexible gear flange 102; the outer circle of the other end of the flexible gear body 101 is provided with a flexible gear ring 103; wherein the ratio of the hole diameter D1 of the cylinder inner hole 104 of the flexible gear body 101 to the wall thickness of the flexible gear body 101 is larger than 110.

(as shown in FIG. 3) step S2, fastening the core 3 and the core shaft 2 together by the core fastening screw 4; and then clamping and fixing the excircle C0 of the cylindrical clamping end 301 arranged at the shaft end of the core 3 on a numerically-controlled lathe so as to install the thin-wall part excircle machining tool in place.

The size L5 of the core 3 must be larger than the axial length of the size L2 of the large thin-wall part 1, so that the part can be smoothly taken out after the excircle of the thin-wall part 1 is machined.

Wherein, the core 3 size C1 and the mandrel 3 size C2 can be designed to be clearance fit for disassembly and assembly; and the gap should be small enough to ensure the coaxiality of the installation of the mandrel and the core. Preferably, the tolerance of the outer circle C0 of the core 3 is h6, and the tolerance is the reference for supporting, positioning and assembling the tool.

And step S3, aligning the excircle H2201 of the mandrel 2, so that the circular run-out of the excircle of the mandrel 2 meets the process requirements. If the circular runout of the excircle of the mandrel 2 cannot meet the technological requirements, the core fastening screw 4 is loosened, the core fastening screw 4 is withdrawn from a core fastening screw mounting hole formed in the end face of the shaft of the mandrel 2, the adjusting mandrel 2 is manually rotated until the circular runout of the excircle of the mandrel 2 meets the requirements, and the core fastening screw 4 is fastened again.

In the above embodiment, preferably: the outer circle H2 circle runout of the mandrel 2 is not more than 0.010 mm.

Step S4, coaxially screwing and fittingly installing a positioning sleeve 5 on a fine-tooth external thread rod 3a arranged at the other end of the shaft end of the core 3 by using a wrench until the positioning sleeve 5 is screwed into an inwards concave stepped hole 202 arranged in the center of the outer side of the core shaft 2, and enabling a vertical inwards concave reference positioning surface F2021 at the limit position of the inwards concave stepped hole 202 to be attached to the end surface of the inner side shaft of the positioning sleeve 5; the positioning sleeve bakelite 6 is sleeved on the outer step shaft end surface 501 of the positioning sleeve 5. Namely, the dismounting mechanism is pre-installed on the tool, and the dismounting operation of the dismounting mechanism is convenient.

And step S5, mounting the thin-wall part 1 on the mandrel 2 in a coaxial interference fit manner by using the self-made compression nut 8 and the nut bakelite block 7 on the outer side shaft body of the mandrel 2. For solving the big problem of the interference fit installation degree of difficulty of part on the dabber:

in the above embodiment, further: the step S5 includes the steps of:

step S501, enabling the open end of the cylinder inner hole 104 of the flexible gear body 101 of the thin-wall part 1 to face the shaft end vertical reference positioning surface G204 of the mandrel 2, and enabling the cylinder inner hole 104D1 to be lapped at the outer end of the excircle H2 of the mandrel 2, namely, realizing heading operation.

And step S502, mounting a compression nut bakelite block 7 on the end surface of the vertical shaft outside the flexible gear flange 102 of the thin-wall part 1.

Step S503, a self-made compression nut 8 is properly assembled and installed on the external thread rod 3023 a of the fine thread at the shaft end of the core 3 by a wrench.

Step S504, rotating the self-made compression nut 8, attaching the end face of the vertical shaft on the inner side of the self-made compression nut 8 to the end face of the vertical shaft on the outer side of the nut bakelite block 7, pushing the compression nut bakelite block 7 to axially displace until the compression nut bakelite block 7 pushes the thin-wall part 1 to axially displace, tightly pressing and tightly attaching the thin-wall part 1 to the vertical reference positioning face G on the shaft end of the mandrel 2, and clamping the thin-wall part 1 in place in the concentric interference fit of the H2 on the outer circle of the mandrel 2.

It is thus clear that will the utility model discloses thin wall part 1 and dabber 2's excircle H2 interference fit installation effectively strut thin wall part 1 barrel hole 104 and D1 promptly, prevent that the part excircle processing from warping.

And step S6, turning the outer circle of the thin-wall part 1. In the machining process of the outer circles D2 and D3 of the thin-wall parts, the inner hole B1 of the thin-wall part 1 is in interference fit with the outer circle B2 of the mandrel 2, so that the supporting mechanism and the dismounting mechanism are also connected with the thin-wall part 1 into a whole, and the thin-wall part 1 is prevented from being deformed greatly in the turning process.

(in conjunction with fig. 6 and 7) to ensure the turning accuracy: in the above embodiment, further: in step S6, the path taken by the turning tool is from the axially outer side to the axially inner side of the thin-walled part 1. Namely, the path of the tool in the turning process is A → B (circular arc) → C → D (circular arc) → E.

The turning process of the excircle D2 of the flexible gear body 101 of the thin-wall part 1 and the turning process of the excircle D3 of the flexible gear ring 103 of the thin-wall part 1 are divided into four times in centimeters: namely, when the blanks of the outer circle D2 and the outer circle D3 have 0.25mm allowance respectively, the turning processing of the outer circle D2 and the outer circle D3 is divided into four times of feed amount adjusting 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 until the turning is finished.

And during the fourth feeding, the adjustment is carried out properly according to the actually measured outer circle size so as to meet the outer circle size requirements of the thin-wall parts D2 (phi 203.4h7mm) and D3 (phi 206.972h6 mm). Furthermore, the dimension of the thin-walled parts D2, D3 needs to be checked on the machine to ensure that the check data are consistent with the machining conditions.

And S7, after finishing the machining of the excircle D2 and D3 of the thin-wall part 1, sequentially disassembling the self-made compression nut 8 and the compression nut bakelite block 7, and then disassembling the machined thin-wall part 1 by using the positioning sleeve 5 and the positioning sleeve bakelite block 6.

For solving the problem that the difficulty is big is dismantled to part interference fit on the dabber: in the above embodiment, further: in step S7, the method for disassembling the machined thin-walled part 1 from the mandrel 2 coaxially in interference fit with the thin-walled part is as follows: after the self-made compression nut 8 and the compression nut bakelite block 7 are successively dismantled, the wrench is used for rotating the extending end 502 of the positioning sleeve 5, so that the outer step shaft end surface 501 of the positioning sleeve 5 pushes the positioning sleeve bakelite block 6 to axially move outwards, the outer side shaft end surface of the positioning sleeve bakelite block 6 which axially moves outwards is attached to the inner side shaft end surface of the flexible wheel flange 102 of the thin-wall part 1, the thin-wall part 1 is pushed to axially move outwards in a wear-proof manner until the thin-wall part 1 completely breaks away from the mandrel 2, and the thin-wall part 1 is dismantled from the mandrel 2.

It should be noted that: all bakelite block structures all are used for preventing steel spare and steel spare contact bruise, for two guards of special design for reduce wearing and tearing and vibration, thereby further improve the live time of frock.

Step S8, repeating the step S5, the step S6 and the step S7, namely reassembling a new part to be machined, and disassembling the newly machined part after finishing machining the new part; therefore, the same tool is repeatedly used in a reciprocating mode, and batch processing of the thin-wall parts 1 is achieved.

Therefore, the utility model discloses the extracting tool that position sleeve 5 and position sleeve bakelite piece 6 are constituteed; and a clamping tool consisting of a compression nut bakelite block 7 and a self-made compression nut 8; the disassembling tool and the clamping tool are attached to and contacted with the workpiece through the bakelite block structure; the bakelite block is designed, so that the tool can be conveniently reused, the abrasion and the vibration can be reduced, and the problem that the existing thin-wall part and the assembling and disassembling tool are seriously abraded can be solved.

From the above description it can be found that: the utility model discloses split type hollow structure's frock realizes replacing the mill processing with the car, reaches the purpose of saving time and cost, raising the efficiency; the tool is simple in structure, convenient to process and manufacture, good in manufacturability, capable of being used repeatedly, economical and practical, and suitable for popularization and promotion. The utility model discloses expanded the scope of thin wall part excircle processing, workable if the thin wall part of 120 type flexbile gear, 160 type flexbile gear, 250 type flexbile gear, the manufacturability is good, the qualification rate is high.

To sum up, the utility model discloses a pure mechanical structure's purpose-built split type hollow protection nature abrasionproof decreases frock to the turning replaces abrasive machining, reaches the purpose of save time and cost, solves current flexbile gear processing and takes a lot of work, wastes time, hard technical problem. By adopting the tool, the tool has simple design structure, light dead weight and excellent anti-abrasion effect; the assembly and disassembly operations of the parts from the tool are simple, stable and efficient; the parts are not deformed, and the machining efficiency is high; the tool can be repeatedly used, and is economical and practical; stable, reliable and efficient, and is suitable for popularization and promotion.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on differences from other embodiments.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. Thin wall part excircle processing frock, its characterized in that: the tool consists of a core (3), a mandrel (2), a core fastening screw (4), a positioning sleeve (5), a positioning sleeve bakelite block (6), a compression nut bakelite block (7) and a self-made compression nut (8) which are sequentially assembled on a numerical control lathe; the tool is coaxially and fixedly arranged on the numerical control lathe through one end of the shaft end of the core (3); a core shaft (2) is coaxially and fixedly arranged on the outer side of the middle part of the shaft body of the core (3); the thin-wall part (1) is coaxially installed on the outer side of the mandrel (2) in an interference fit manner, and the hollow structure of the thin-wall part (1) is filled in the shaft body of the mandrel (2); the other end of the shaft end of the core (3) is provided with a fine-tooth external thread rod (302); the fine-tooth external thread rod (302) is used for sequentially screwing, adapting and installing the positioning sleeve (5) and the self-made compression nut (8); a positioning sleeve bakelite block (6) is arranged on the outer working surface of the shaft end of the positioning sleeve (5); a nut bakelite block (7) is arranged on the inner working surface of the shaft end of the self-made compression nut (8); the self-made compression nut (8) and the nut bakelite block (7) are used for pushing the thin-wall part (1) axially inwards so as to connect the thin-wall part (1) and the mandrel (2) into a whole in a coaxial interference fit manner; the positioning sleeve (5) and the positioning sleeve bakelite block (6) are used for pushing the thin-wall part (1) outwards in the axial direction in the reverse direction so as to remove the thin-wall part (1) from the mandrel (2).

2. The thin-walled part outer circle machining tool according to claim 1, characterized in that: 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 one end of the flexible gear body (101) is provided with a flexible gear flange (102); the outer circle of the other end of the flexible gear body (101) is provided with a flexible gear ring (103); 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 larger than 110.

3. The thin-walled part excircle processing frock of claim 1, characterized in that: the external thread rod (302) with the fine teeth extends from the inner side of the mandrel (2) to the outer side of the shaft end of the mandrel (2); the center of the outer side of the shaft end of the mandrel (2) is provided with an inwards concave stepped hole (202); the concave stepped hole (202) is used for accommodating one end of the positioning sleeve (5) and the positioning sleeve bakelite block (6); the other end of the positioning sleeve (5) extends out of the concave stepped hole (202) of the mandrel (2); a step shaft end surface (501) is arranged on the outer side of the positioning sleeve (5) accommodated in the concave step hole (202); and the step shaft end surface (501) is provided with a positioning sleeve bakelite block (6).

4. The thin-walled part outer circle machining tool according to claim 1, characterized in that: the self-made compression nut (8) and the nut bakelite block (7) compress the outer diameter of the working end face to be less than or equal to the outer diameter of a flexible gear flange (102) made on the thin-wall part (1).

5. The thin-walled part outer circle machining tool according to claim 1, characterized in that: the center of the mandrel (2) is provided with a lightening hole (203).

6. The thin-walled part outer circle machining tool according to claim 1, characterized in that: the mandrel (2) is a cast iron mandrel; the core (3) is a steel core; the core shaft (2), the core (3), the positioning sleeve (5) and the self-made compression nut (8) are high-hardness and wear-resistant parts subjected to heat treatment and aging treatment.

7. The thin-walled part outer circle machining tool according to claim 1, characterized in that: the rotating ends of the positioning sleeve (5) and the self-made compression nut (8) are respectively provided with a square handle (9); the size of the square handle (9) is matched with the working size of the wrench.

8. The thin-walled part outer circle machining tool according to claim 1, characterized in that: the edge of the end face of the outer side shaft of the mandrel (2) is provided with a round angle R2; the corner of the end face of the inner side shaft of the flexible gear body (101) of the thin-wall part (1) is provided with a round corner R1; when the thin-wall part (1) is connected with the mandrel (2) into a whole in a coaxial interference fit mode, a gap is reserved between the fillet R2 and the fillet R1.

9. The thin-walled part outer circle machining tool according to claim 1, characterized in that: one end of the shaft end of the core (3) is provided with a cylindrical clamping end (301); and the cylindrical clamping end (301) is used for coaxially and fixedly mounting the core (3) and the tool on the numerical control lathe integrally.

10. The thin-walled part excircle processing frock of claim 1, characterized in that: the middle part of the shaft body of the core (3) is provided with a mounting flange (303); the mounting flange (303) is used for fastening the core (3) and the core shaft (2) into a whole by using a core fastening screw (4).

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