Method for manufacturing automobile transmission limiting ring

A technology for automotive gearboxes and limit rings, which is applied in the field of metal processing, and can solve the problems of reducing gear interchangeability, long processing time for grooves, and increasing manufacturing costs, so as to achieve small deformation, shorten manufacturing time, and reduce waste products rate effect

Inactive Publication Date: 2014-05-07
CHONGQING CHUANGJING WARM FORGING FORMING
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  • Abstract
  • Description
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  • Application Information

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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.

Method used

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  • Method for manufacturing automobile transmission limiting ring
  • Method for manufacturing automobile transmission limiting ring

Examples

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Embodiment 1

[0024] The preparation method of automobile transmission limit ring of the present invention comprises the following steps:

[0025] (1) Use 20CrMoH as the raw material to cut into material sections, grind the surface through centerless grinding, then spray the lubricant, and dry the lubricant; Check whether there are cracks, etc., and if there are, it will be judged as unqualified; then spray lubricant on its surface. The commonly used lubricant is graphite or organic polymer lubricant to lubricate.

[0026] (2) Heat the blank to 750°C-800°C in an intermediate frequency induction heating furnace with a protective atmosphere, and warm forge it on a press to form a pre-forged billet. The inner wall of the pre-forged billet is equally distributed with three grooves, and the angle between 120° (see figure 1 ). The protective atmosphere is to add protective nitrogen or inert gas into the medium frequency induction heating furnace to prevent the billet from being severely oxidize...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 胡活苏涛敬勇
Owner CHONGQING CHUANGJING WARM FORGING FORMING
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