Method for manufacturing driven transmission gear of automobile automatic gearbox

Abstract

The invention discloses a method for manufacturing a driven transmission gear of an automobile automatic gearbox, which comprises the following steps of: (1) sawing a raw material into sections, grinding the surface and checking cracks through flaw detection; (2) heating the blank material to 1150-1180 DEG C, forging into a preforging blank with rectangular spline on a hot die forging press, wherein a die used by the hot die forging press is designed according to the processing drawings of the driven gear and can forge out the preforging blank conforming to requirements; (3) isothermally normalizing the preforging blank, performing forced shot blasting, and phosphorizing and saponifying the surface; and (4) arranging the preforging blank on a hydraulic press, and coldly and precisely straightening the spline to increase the accuracy and the roughness of the spline so as to achieve technical requirements. The manufacturing method can be applied to industrialization, the manufactured product has stable quality and can substitute for imported parts to be used on the automobile automatic gearbox, and the localization requirement of domestic manufacturers can be satisfied. The manufacturing cost can be effectively reduced, and the market share can be expanded. After the composite technical treatment of hot forging and cold precise straightening, the accuracy and the roughness of the driven gear and the spline can be effectively increased to exceed the Chinese standard level 6.

Description

technical field [0001] The invention relates to a method for manufacturing an internal transmission gear of an automobile hydraulic automatic transmission (AT), in particular to a method for manufacturing a gear with high-precision rectangular spline teeth in the automatic transmission. technical background [0002] The driving gear of the automatic transmission of automobiles is an important part in the hydraulic automatic transmission (AT), which plays the role of transmitting power. This part has always been manufactured abroad and imported together with the automatic transmission. The large foreign automobile manufacturers have kept it secret as the core technology and will not transfer it to China. In recent years, domestic automobile factories have gradually independently developed hydraulic automatic transmissions (AT), and put forward localization requirements for the transmission driven gears. This part is a forging with high precision and complex shape, which i...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the fact that in the prior art there is no manufacturing method suitable for the industrialized manufacture of transmission driven teeth of automatic transmissions for automobiles, and the transmission driven teeth cannot be manufactured by mechanical processing, nor can they be manufactured simply by cold extrusion, nor can they be To provide a manufacturing method suitable for industrialized manufacturing of driven gears for automatic transmissions of automobiles by means of casting molding or powder metallurgy molding.

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