Cold Extrusion Forming Technology of Pinion Shaft in Power Steering Gear

Abstract

The invention discloses a cold extrusion molding process of a pinion shaft in a power steering gear, which comprises the following steps: step 1, sawing a cylindrical blank with a required length on a disc according to product requirements; step 2, grinding The outer circle of the cylindrical blank; Step 3, carry out the first phosphorus saponification treatment to the cylindrical blank according to the conventional phosphorus saponification process; Step 4, put the blank into a cold extrusion molding die for forward extrusion process , be pressed into the preform of pinion shaft; step five, carry out spheroidizing annealing treatment to preform; step six, carry out the second phosphorus saponification process to blank according to conventional phosphorus saponification process; step seven, pass through The blank in step 6 is then put into a cold extrusion molding die for a reverse extrusion process to be pressed into a cold extrusion of the pinion shaft. The cold extrusion molding process of the pinion shaft in the power steering gear of the present invention realizes one-time molding of the pinion gear shaft in the power steering gear, and realizes less cutting or no cutting processing of complex cavity parts.

Description

technical field [0001] The invention relates to a cold extrusion process, in particular to a cold extrusion forming process for a pinion shaft in a power steering gear. Background technique [0002] The pinion shaft in the steering gear is a part of the car, and its cold extrusion structure (see figure 1 and figure 2 ) includes a cylindrical small shaft 11 at the top, a cylindrical central shaft 12 formed by increasing the diameter through a step, and a sleeve 13 with a blind hole-shaped cavity at the bottom formed by increasing the diameter through a step. The lower part 131 of the cavity is cylindrical, and the cross section of the upper part 132 is a two-piece fan-shaped center symmetrical and transitions with the cylindrical lower part 131 of the cavity in a stepped shape. The pinion shaft in the prior art is mainly processed by cutting, which not only complicates the process and consumes a lot of money, but also makes it difficult to control the machining accuracy, e...

AI Technical Summary

Problems solved by technology

The processing method of the pinion shaft in the prior art is mainly through cutting, which not only complicates the process and consumes a lot of money, but also makes it difficult to control the processing accuracy, especially the consistency of batches of products is difficult to guarantee, and the production cost is also high, so it needs to be improved urgently

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