Method for manufacturing automobile transmission limiting ring

Abstract

The invention provides a method for manufacturing an automobile transmission limiting ring. A final forging blank is manufactured through cold extruding after a pre-forged blank is manufactured through constant-temperature forging. The method is characterized in that an inner groove is formed in the inner wall of the pre-forged blank, an outer groove is formed in the outer wall of the final forged blank, the width of the inner groove of the pre-forged blank is 10% to 15% the width of the outer groove of the pre-forged blank, and equal radial pressure exertion is adopted for the cold extruding. The product manufactured through the method is high in precision, less in oxidation, good in internal metal structure, smaller in grain size, and capable of preventing poor structures such as coarse grain and mixed grain; the internal structure is compact, and the mechanical strength is improved by 35% compared with a traditional machined piece; unit pressure exerted on a die is remarkably reduced, and the service life of the die is quite long.

Description

technical field [0001] The invention belongs to metal processing, in particular to a preparation method of a limit ring of an automobile gearbox. Background technique [0002] The limit ring is an important part of the car gearbox, which is very important for the safe driving of the car, directly affects the power transmission and smooth performance of the car, and plays an important role in ensuring the safe driving of the car. [0003] In the prior art, the limit ring of the automobile gearbox is usually machined, and the groove structure on the limit ring is usually processed by a lathe milling machine, which has low efficiency, especially the machining center takes a long time to mill the groove and the surface quality is poor . The low precision will also reduce the interchangeability of gears, and the scrap rate of parts will be high, which will also increase its manufacturing cost. Contents of the invention [0004] The object of the present invention is to provid...

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Problems solved by technology

[0003] In the prior art, the limit ring of the automobile gearbox is usually machined, and the groove structure on the limit ring is usually processed by a lathe milling machine, which has low efficiency, especially the machining center takes a long time to mill the groove and the surface quality is poor

The low precision will also reduce the interchangeability of gears, and the scrap rate of parts is high, which also increases its manufacturing cost.

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