Method for improving elongation and shrinkage of rod part of steering knuckle

Abstract

The invention relates to the technical field of steering knuckles, and in particular relates to a method for improving the elongation and the shrinkage of a rod part of a steering knuckle. The methodcomprises the steps of heating round steel, upsetting, extruding, pre-forging and finish-forging to obtain a forging blank, and during pre-forging, arranging a transition arc at the joint of the rod part and a disc part of the steering knuckle, and the transition arc forming an annular face around the axis of the rod part. The radius of the transition arc on the side, close to a steering knuckle long lug, of the annular face is R1, R1 is a fixed value, the radius of the transition arc on the side, close to a steering knuckle short lug, of the annular face is R2, the plane where the axis of therod part of the steering knuckle and the axis of a main pin hole are located serves as a datum plane, and R2 is evenly reduced to R1 along with the angle deviating from the datum plane. According tothe method, rod part mold filling can be facilitated, shear damage of an internal metal flow line in the forming process of the rod part of the steering knuckle is reduced, and reduction of the mechanical performance of the rod part is avoided; the rod part can be uniformly distributed, and two sides of the flow line are uniformly and symmetrically distributed; and the stress distribution at the joint of the rod part and the disc part of the steering knuckle is improved.

Description

technical field [0001] The invention relates to the technical field of steering knuckles, in particular to a method for improving the elongation and contraction ratio of the steering knuckle stem. Background technique [0002] The steering knuckle is one of the main parts on the steering axle of the car, which can make the car run stably and transmit the driving direction sensitively. The function of the steering knuckle is to bear the front load of the car, support and drive the front wheel to rotate around the kingpin to make the car turn. The steering knuckle includes a rod part, a disc part and an ear part (long ear and short ear), wherein the long ear and the short ear are provided with coaxial kingpin holes. [0003] Steering knuckles are generally forged from round steel into forging blanks, and then heat-treated and machined to obtain finished products. Since the steering knuckle bears a large load during use, and the magnitude and direction of the load change with ...

AI Technical Summary

Problems solved by technology

Since the steering knuckle bears a large load during use, and the magnitude and direction of the load change with the road conditions and vehicle speed, the mechanical performance requirements of the steering knuckle are relatively high, among which the elongation and shrinkage of the rod can be used to a certain extent It reflects the mechanical performance of the steering knuckle. At present, there is no published prior art to detect this index and actively improve this index

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