A male shaft processing method and mold for an intermediate shaft of an automobile steering system

Abstract

The invention relates to a male shaft processing method of an intermediate shaft of an automobile steering system and a mold thereof. The processing method utilizes an upsetting molding die to perform upsetting and extrusion molding on one end of a bar to form a T-shaped blank, and then bend the T-shaped head to form a The U-shaped fork of the male shaft, after surface lubrication treatment, cold extrudes the spline part of the male shaft, and finally the required male shaft can be obtained through supplementary machining and final heat treatment; the mold is used for the bar end Part of the upsetting extrusion molding, in order to obtain the T-shaped head. The invention has high material utilization rate, high processing efficiency, good consistency, high forming precision, and high strength of the connection part between the U-shaped fork and the external spline.

Description

technical field [0001] The invention belongs to the field of auto parts processing, and in particular relates to a male shaft processing method of an intermediate shaft of an automobile steering system and a mold thereof. Background technique [0002] The intermediate shaft is one of the core components of the automobile transmission system, which is used to transmit steering motion and steering force. There are two main types of connecting modes of the male shaft and the female shaft of the existing intermediate shaft: pin locking type and key sliding type. [0003] The key sliding type is to process external splines on the male shaft and internal splines on the female shaft, then install rolling elements and cages on the external splines, and then press the male shaft into the female shaft. The advantage of the male-female shaft connection method of the intermediate shaft is that the male shaft and the female shaft can slide relative to each other for a certain distance, ...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: 1. The U-shaped fork and the external spline of the shaft are formed separately, and the process is long; 2. When the tooling is used to clamp the male shaft to process the external spline, due to the large length-to-diameter ratio of such parts , the length of the spline is large, so it is difficult to control the machining accuracy, and even the processed spline keyway will be skewed, which will affect the use with the female shaft, and the spline part will be connected with the U-shaped fork for subsequent use, so it is difficult to ensure the spline The coaxiality of the part and the U-shaped fork may easily cause vibration during the transmission process; 3. If the follow-up welding process is adopted, welding defects are likely to exist, causing potential safety hazards

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