Steering shaft block type cold extrusion forming die and application

Abstract

The invention discloses a steering shaft block type cold extrusion forming die and application. The forming die comprises an upper die, a lower die and a blank positioned between the upper die and thelower die, wherein the upper die comprises an upper concave die and an upper convex die positioned in the upper concave die; the lower die comprises a lower concave die positioned under the upper concave die, a spring seat positioned under the lower concave die, a nitrogen spring arranged between the lower concave die and the spring seat and a lower convex die penetrating through the center of the spring seat. The steering shaft block type cold extrusion forming method comprises the steps of blanking, spheroidizing annealing, shot blasting, surface lubricating and cold extruding, a steering shaft prepared by using the die has stable quality and high processing efficiency, can be molded once by using the process, so that the concentricity can be ensured, and the service life of the die canbe prolonged. The forming die has low processing cost, simple process flow, short processing cycle, and small subsequent cutting processing, and can meet the requirement of large-scale production.

Description

technical field [0001] The invention relates to a cold extrusion forming die, in particular to a steering shaft closed type cold extrusion forming die and its application. Background technique [0002] The automobile industry is an important pillar industry of the national economy and plays an important role in the development of the national economy and society. With the rapid development of automobile manufacturing technology, the requirements for the "quality" and "quantity" of auto parts are getting higher and higher. Improving the processing and forming quality of parts, mass production, reducing manufacturing costs, and reducing production energy consumption have become The development direction of automobile manufacturing industry. [0003] In the prior art, the steering shaft in the automobile steering system such as figure 1 As shown, the shape of the steering shaft is composed of a large end A and a small end B, and the large end A has a boss C and a toothed blin...

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