Three-sided tooth cold extrusion forming die at the end of the bushing

Abstract

The invention discloses a shaft sleeve end three-side tooth cold extrusion forming die. The die is composed of an upper die body, a lower die body, a bushing and an ejector rod. Axial tooth-form grooves are evenly distributed in the inner wall of an upper die cavity of the lower die body, and radial tooth-form grooves are evenly distributed in the bottom end face of the upper die cavity. The upper die body is a shaft which is of a multi-step structure, wherein the downward die head segment is a tapered shaft, and the shaft segment connected with the tapered shaft is a cylindrical shaft; axial tooth-form grooves are evenly distributed in the outer wall of the cylindrical shaft, and the combined portion of the tapered shaft and cylindrical shaft is a downward end face where radial tooth-form grooves are evenly distributed. When the upper die body is matched with the lower die body, positioning is achieved in the mode that the radial tooth grooves and the axial tooth grooves are staggered by one tooth position. According to the die, a closed die cavity structure is adopted, a three-side tooth at the big end of a forging stock is formed through extrusion at a time, and extrusion forming quality is good and stable; most important of all, full tooth filling is achieved; furthermore, the tooth texture is dense, and therefore metal fiber has high integrity and high strength.

Description

technical field [0001] The invention relates to a cold extrusion die, in particular to a closed cold extrusion die, in particular to a cold extrusion forming die for gears at the end of an input shaft sleeve configured in an automobile gearbox. Background technique [0002] The input shaft sleeve is the transmission part of the automobile gearbox, and the shaft is used to transmit torque. The upper and lower end surfaces of the large end of the input shaft sleeve and the outer peripheral wall are provided with concave and convex alternate teeth. Under the existing process conditions, the three-sided teeth of the input shaft sleeve can be completely formed by cutting, but the cutting production efficiency is too low to be suitable. Organize mass production. At present, the industry generally adopts the powder metallurgy process to produce the input shaft sleeve. Although powder metallurgy technology is very mature and can realize the industrialization of this product, powde...

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Problems solved by technology

[0003] The invention mainly aims at the problem that the mechanical strength of the input shaft sleeve produced by the powder metallurgy process in the prior art is not high, and proposes a three-sided tooth cold extrusion forming die at the end of the shaft sleeve with a simple structure and easy manufacture. The die has high forging efficiency and the product Good forming quality and high mechanical strength

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