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Cold-forging precise forming technique of gear sleeve

A precision forming and gear sleeve technology, which is applied in the field of gear sleeve cold forging precision forming process and the cold forging precision forming process of the gear sleeve, can solve the problems of long gear sleeve forming process, low product qualification rate, and high material consumption, etc. Achieve the effect of shortening the processing process, improving the overall quality and improving the production efficiency

Inactive Publication Date: 2008-12-31
SHANGHAI DONGFU COLD FORGING MFG
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  • Description
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a cold forging precision forming process of gear sleeves, which solves the technical problems of the existing gear sleeves such as long forming process, high material consumption, low product qualification rate, and poor forming efficiency.

Method used

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  • Cold-forging precise forming technique of gear sleeve
  • Cold-forging precise forming technique of gear sleeve

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Embodiment

[0022] As shown in Figure 3, it is a cold forging process flow chart. A cold forging precision forming process for gear sleeves is as follows: the first step is to blank the alloy steel pipe billet with a circular saw, and the weight error between the blank blank and the gear sleeve ±0.5 grams;

[0023] In the second step, the blank steel tube is annealed in a pit furnace at 850°C for 6 hours, and then cooled to 300°C along with the furnace and released;

[0024] The third step is to phosphatize and saponify the annealed steel tube blanks according to the conventional process using a phosphorus saponification line to form a surface lubricating layer. The phosphating temperature is 80°C and the time is 20 minutes; the saponification temperature is 60°C. The time is 10 minutes;

[0025] The fourth step is to use high-strength die steel to manufacture pre-formed molds and occluded forging molds;

[0026] The fifth step is to use a 400T mechanical press, a four-column universal die se...

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Abstract

The invention relates to a cold forging technology for a gear sleeve, and the cold forging technology is characterized in that a technology of cold forging and precision near net forming and a new technology of block split flow forging are adopted, an internal gear hole and the exterior are formed in one step by compound cold forging, subsequent processing is not necessary, the precision of the gear form is above Grade Seven, a volume split flow space is arranged between the external diameter of the gear sleeve and a concave die, the metal flow resistance is reduced, and the unit extruding force carried by the die is lowered; alloy steel tube blank is adopted for block forging, and no waste is formed by cold forging; the utilization ratio of materials achieves more than 90%, the position deviation of the gear form is not more than 0.03mm, and the production efficiency is improved greatly; after the inspection of the product, various technical parameters of the formed product achieve the technical standard of the like products of Toyota Motor Corporation of Japan, and the forming technology is superior to that of Japan, and reaches the international advanced level.

Description

Technical field [0001] The invention relates to a cold forging precision forming process for a gear sleeve, in particular to a cold forging precision forming process for a gear sleeve for a car steering assembly, and belongs to the technical field of cold forging precision forming technology. Background technique [0002] The gear sleeve is currently to be processed, as shown in Figures 1 and 2. The gear sleeve is composed of a stepped hole, a three-way flattened cylindrical big end C and a cylindrical small end D, and an inner cone hole B and an inner tooth hole A. The traditional processing method is to broach the internal teeth with a tooth broach after cutting the shape and the inner hole. If the general forging method is used, only a hollow cylinder with large and small ends can be formed. The flattened shape and the inner hole still need to be cut. And broaching tooth hole forming, the disadvantages of cutting processing are long tooth sleeve forming process, high material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/30B21J13/02
Inventor 廖世绍廖泽寰廖泽亮
Owner SHANGHAI DONGFU COLD FORGING MFG
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