Cold extrusion mold for blind hole inner spline

Abstract

The invention discloses a cold extrusion mold for a blind hole inner spline. The cold extrusion mold for the blind hole inner spline comprises an upper mold and a lower mold, wherein the upper mold and the lower mold are connected through guide sliding posts to form a mold frame; an upper cushion block, an upper mold seat and an upper locking ring are positioned and installed on the upper mold by taking an upper mold plate and an upper positioning sleeve as carriers; a bottom cushion block, a base and a lower locking ring are positioned and installed on the lower mold by taking a bottom plate and a lower positioning sleeve as carriers; a mold head which extends out downward is positioned and installed on the upper mold seat of the upper mold; an elastic top consisting of a ring and a spring is fixedly connected with the bottom surface of the upper mold seat by taking the mold head a center; a toothed mold is positioned and installed on a base of the lower mold; the toothed mold with an upward mold cavity is coaxial with the mold head. The blind hold inner spline is formed by cold extrusion; the process is advanced; the structure is reasonable; the extrusion quality is high; moreover, the production efficiency is high. The cold extrusion mold for the blind hole inner spline is suitable for machining blind hole inner splines in all specifications.

Description

technical field [0001] The invention relates to a metal cold extrusion die, in particular to a blind hole internal spline cold extrusion die. Background technique [0002] The output gear in the automobile transmission is a bevel gear with a bushing structure, and the cooperation between the inner hole and the shaft is a spline fit. Long-term operation causes the internal and external temperature of the transmission to be inconsistent, and the temperature difference leads to a pressure difference, which causes a small amount of lubricating oil in the box to seep out along the spline gap, and the leaked oil pollutes the environment. In order to avoid the leakage of lubricating oil here, the industry has changed the output gear of the traditional through-hole internal spline structure into a blind-hole internal spline structure. This improved design does not change the original assembly relationship and transmission quality. At the same time, oil seepage channels can be elimi...

AI Technical Summary

Problems solved by technology

However, this kind of blind hole structure makes the manufacturing difficulty increase sharply. The conventional broaching process is not suitable for processing internal splines in the blind hole, and only the slotting process can be used to achieve effective production.

However, the production efficiency of the slotting process is very low, and the production cost is high, which is only suitable for single-piece or small-batch production applications, not suitable for mass production

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