Secondary synchronous cold extruding forming production method for cross axles of automobile differentials and planetary reducers

Abstract

The invention discloses a secondary synchronous cold extruding forming production method for cross axles of automobile differentials and planetary reducers. A die of the method comprises an upper die inner die, an upper die outer die, a lower die inner die and a lower die outer die, concave cavities of the upper die inner die and the lower die inner die form a die cavity after being closed, four oil cylinders are arranged on a hydraulic machine, the upper die inner oil cylinder and the lower die inner oil cylinder are connected with the upper die inner die and the lower die inner die respectively, and the upper die outer oil cylinder and the lower die outer oil cylinder are connected with the upper die outer die and the lower die outer die respectively and drive the same to move respectively. During cold extrusion, the upper die outer die and the lower die outer die are closed, then the upper die inner die and the lower die inner die are closed to press material sections, and the material sections are extruded and pushed to deform in the die cavity after pressurization. The cold extruding method is high in size accuracy and less in oxidation as compared with a hot forging method, service life of the die is quite long, and under the action of synchronous and constant-pressure extrusion of the upper die inner oil cylinder and the lower die inner oil cylinder, forming precision is high, and production internal composition is good.

Description

technical field [0001] The invention relates to a manufacturing method of a gear of an automobile power transmission system, in particular to a manufacturing method of secondary synchronous cold extrusion forming of a cross shaft of an automobile differential and a planetary reducer. Background technique [0002] The cross shaft of the automobile differential and planetary reducer is a very important part in the power transmission system of the automobile. It plays the role of power transmission, deceleration and speed regulation. The quality of its production is directly related to the safety and life of the automobile. In the prior art, the cross shafts of automobile differentials and planetary reducers are usually manufactured by high-temperature hot forging in multiple stages. First, the blank is made and then hot forged in the mold. After the cross shaft is heated to the forging temperature, the forging The manufacturing method of blank forming, and then forging in the ...

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Problems solved by technology

[0003] The present invention aims at the deficiencies in the prior art that the cross shafts of the differential and the planetary reducer in the automobile transmission system are mainly formed by hot forging in a mould, which requires heating to waste energy, the scrap rate of parts and increase the manufacturing cost, etc., and provides a A cross-axis secondary synchronous cold extrusion molding manufacturing method with high dimensional accuracy, less oxidation, shortened manufacturing time, reduced scrap rate of parts, and reduced manufacturing cost

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