Differential gear forming die

Abstract

The invention relates to a differential gear forming die which belongs to processing dies of a car differential gear, and the invention overcomes the problems of insufficient inherent stress of the existing forging dies and low life of dies to satisfy forming requirements of car differential satellite gears and axle shaft gears. The invention is composed of an upper die and a lower die, wherein the upper die comprises an upper punching head, an upper die cushion block, an upper concave die, an upper die inherent stress inside loop and an upper die inherent stress outside loop; the lower die comprises a lower push rod, a lower die cushion block, a lower punching head, a lower concave die and a lower die inherent stress loop; the upper concave die forms an interference fit with an upper round platform of an inside hole of the upper die inherent stress inside loop; and an upper concave die appearance cylindrical part forms a non-interference fit with the upper round platform of the inside hole of the upper die inherent stress inside loop. The invention is easy to be installed and manufactured; the space is saved; because the differential gear forming die adopts ladder structure and non-uniform interference structure, greatly increases inherent stress effect of the die, enhances the bearing capacity of the die, the service life and the manufacturing efficiency, and is especially suitable for a forcing press having a smaller job table.

Description

technical field [0001] The invention belongs to a processing mold for a differential gear of a car, in particular to a forming mold for a differential gear. Background technique [0002] The differential gear is an important power transmission component in a car. Its mechanical properties directly determine the safety and stability of the car. The traditional method mainly uses Gleason planer to process the differential gear. Since this method is cutting, the metal fiber is cut off, which reduces the strength of the gear and shortens the service life. In recent years, the cold extrusion method has been gradually adopted for production. The life of the die in cold extrusion is one of the key factors determining the cost of the product. Many people have studied the gear combination die, see (1) Kutuk, M.A.et al..Finite element analysis of a cylindrical approach forshrink-fit precision gear forging dies. Proceedings, Institution of Mechanical Engineers World Congress, London,...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a differential gear forming die, which overcomes the problems of insufficient prestress and low die life in existing forging dies, so as to meet the forming requirements of planetary gears and half shaft gears of automobile differentials

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