Abstract
The present invention discloses a cold forging process for starting gear end face teeth, comprising the following steps: 1) using a CNC sawing machine to cut the material, with a verticality of 0.4; 2) Adopting a well type vacuum annealing furnace for vacuuming and nitrogen protection annealing, the annealing heating rate is less than 150 ℃/h, and the cooling rate is less than 50 ℃/h; Pre vacuum pumping, fill with nitrogen gas at a pressure of 1MPa after each pumping; After annealing, the depth of oxidation decarburization on one side is 0.15 millimeters; 3) Using an instrument lathe for billet production, the height error is controlled within 0.2; 4) Perform degreasing, acid washing, water washing, phosphating treatment, air cooling, and saponification treatment on the raw materials; 5) Pre forged teeth, using a 2500KN hydraulic press for extrusion, with an extrusion force of 250T and a tooth equal division error within 0.03; 6) Precision forging teeth, using a 2500KN hydraulic press for extrusion, with an extrusion force of 250T, end face tooth height error within 0.03, and tooth surface roughness of 1.3. The cold forging process for the end face of the starting gear of the present invention has high production efficiency, stable quality, and high strength.
Description
Cold forging process for starting gear end face teeth
Technical field
The present invention relates to the cold forging process of starting gear end face teeth.
Background technology
At present, there are many types of starting gears on the market, which have been widely used on motorcycles, but the end face teeth are basically machined using traditional milling. Traditional processing methods have drawbacks such as low efficiency, excessive energy consumption, high equipment investment, and unstable product quality. The waste of raw materials is serious, and due to the defects of the hot forging billet itself that cannot be compensated for through subsequent processing, it poses a hidden danger to product quality. The starting gear is a type of starting mechanism that requires high strength for the end face teeth and extremely high metallographic requirements for the product. Traditional manufacturing methods are difficult to achieve.
Summary of the invention
The purpose of the present invention is to provide a cold forging process for the end face teeth of a starting gear, which has high production efficiency, stable quality, and high strength.
To achieve the above objectives, the technical solution of the present invention is to design a cold forging process for the end face teeth of a starting gear, comprising the following steps:
1) Using CNC sawing machine for cutting, with a verticality of 0.4;
2) Adopting a well type vacuum annealing furnace for vacuuming and nitrogen protection annealing, the annealing heating rate is less than 150 ℃/h, and the cooling rate is less than 50 ℃/h; Pre vacuum pumping, fill with nitrogen gas at a pressure of 1MPa after each pumping; After annealing, the depth of oxidation decarburization on one side is 0.15 millimeters;
3) Using an instrument lathe for billet production, the height error is controlled within 0.2;
4) Perform degreasing, acid washing, water washing, phosphating treatment, air cooling, and saponification treatment on the raw materials;
5) Pre forged teeth, using a 2500KN hydraulic press for extrusion, with an extrusion force of 250T and a tooth equal division error within 0.03;
6) Precision forging teeth, using a 2500KN hydraulic press for extrusion, with an extrusion force of 250T, end face tooth height error within 0.03, and tooth surface roughness of 1.3.
The advantages and beneficial effects of the present invention lie in providing a cold forging process for the end face teeth of a starting gear, which has high production efficiency, stable quality, and high strength.
Specific implementation method
Below, specific embodiments of the present invention will be further described in conjunction with examples. The following embodiments are only used to illustrate the technical solution of the present invention more clearly and should not be used to limit the scope of protection of the present invention.
The specific technical solution for implementing the present invention is:
A cold forging process for starting gear end face teeth, comprising the following steps:
1) Using CNC sawing machine for cutting, with a verticality of 0.4;
2) Adopting a well type vacuum annealing furnace for vacuuming and nitrogen protection annealing, the annealing heating rate is less than 150 ℃/h, and the cooling rate is less than 50 ℃/h; Pre vacuum pumping, fill with nitrogen gas at a pressure of 1MPa after each pumping; After annealing, the depth of oxidation decarburization on one side is 0.15 millimeters;
3) Using an instrument lathe for billet production, the height error is controlled within 0.2;
4) Perform degreasing, acid washing, water washing, phosphating treatment, air cooling, and saponification treatment on the raw materials;
5) Pre forged teeth, using a 2500KN hydraulic press for extrusion, with an extrusion force of 250T and a tooth equal division error within 0.03;
6) Precision forging teeth, using a 2500KN hydraulic press for extrusion, with an extrusion force of 250T, end face tooth height error within 0.03, and tooth surface roughness of 1.3.
The above is only the preferred embodiment of the present invention. It should be pointed out that for ordinary technical personnel in this field, several improvements and embellishments can be made without departing from the technical principles of the present invention. These improvements and embellishments should also be considered as the scope of protection of the present invention.
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