Rear axle housing assembly semi-axle sleeve oil sealed shaft neck surface processing technique

Abstract

The invention belongs to the technical field of mechanical processing, which relates to a surface processing technology of a full floating typed rear axle assembly half shaft sleeve oil seal shaft neck. The tool holder of a numerical control lathe is respectively provided with a nipping and turning tool of a numerical control machine and an external round rolling tool; the surface of the external round of all sections of the half shaft sleeve 3 is precisely turned by the nipping and turning tool of the numerical control machine; wherein, a rolling processing allowance is preserved along the diameter direction of the external round of an internal oil seal shaft neck and an external oil seal shaft neck; after the surface roughness is less than Ra3.2, the tool holder is rotated; the rolling process is achieved for the external round surfaces 1, 2 which are matched with the internal oil seal and the external oil seal by the external round rolling tool, so as to lead the surface roughness to be less than Ra0.8; after that, a polisher abrasive belt which is arranged on the lathe is used for polishing, so as to eliminate fine spiral line patterns which are generated on the rolling surface. The invention has lower cost compared with the method that polishing is achieved after directly precise turning and the grinding is replaced by the turning, furthermore, the oil leakage ratio of the oil seal of the rear axle rear hub is reduced from 4-6 millesimal before the method is improved to 1.8 millesimal, the quality of the products is obviously improved, and the requirements of the users are satisfied.

Description

technical field [0001] The invention belongs to the field of mechanical processing technology, and relates to a surface processing technology of a shaft sleeve oil seal journal of a full-floating rear axle housing assembly. Background technique [0002] At present, the finishing process of the outer circle surface of each section of the half-shaft casing of the full-floating rear axle housing assembly is generally carried out by ordinary grinding machines or CNC grinding machines. The main disadvantages are large investment and low production efficiency. Moreover, if the grinding is not divided into rough grinding and fine grinding, the general surface roughness can only reach Ra1.6; and the outer circle of each section of the half-axis casing of the rear axle housing assembly is finished by using a car instead of grinding, first on a CNC lathe Finish the car so that the surface roughness reaches about Ra2.5, and then use a polishing machine to polish and assemble the outer ...

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Problems solved by technology

[0002] At present, the finishing process of the outer circle surface of each section of the half-axis casing of the full-floating rear axle housing assembly is generally carried out by ordinary grinding machines or CNC grinding machines. The main disadvantages are large investment and low production efficiency.

Moreover, if the grinding is not divided into rough grinding and fine grinding, the general surface roughness can only reach Ra1.6; and the outer circle of each section of the half-axis casing of the rear axle housing assembly is finished by using a car instead of grinding, first on a CNC lathe Finish the car so that the surface roughness reaches about Ra2.5, and then use a polishing machine to polish and assemble the outer circles of each section of the inner and outer oil seals, so that the surface roughness value reaches Ra1.6, but when the finish car reaches Ra2.5, the blade The cost is high, and it is difficult to polish to Ra1.6, not to mention that the requirement is less than Ra0.8. Therefore, this process needs to improve the surface quality, and the polishing time will be prolonged, which cannot meet the needs of mass production, and the annual average failure rate of oil leakage Generally 4~6‰, which cannot meet the requirements of batch processing

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