Machining method for automotive front axle half shaft

Abstract

The invention discloses a machining method for an automotive front axle half shaft, comprising the following steps that a steel ingot is poured, and the steel ingot comprises the chemical compositions in percentage by weight that C is more than or equal to 0.180 percent and is less than or equal to 0.250 percent, Si is more than or equal to 0.79 percent and is less than or equal to 1.00 percent, Mn is more than or equal to 0.78 percent and is less than or equal to 1.00 percent, P is more than or equal to trace amount and is less than or equal to 0.030 percent, S is more than or equal to trace amount and is less than or equal to 0.030 percent, Cr is more than or equal to 11.50 percent and is less than or equal to 13.50 percent, and inevitable impurities account for the rest amount. The machining method for the automotive front axle half shaft facilitates large-batch industrialized production, the phenomena of dirt containing and insufficient filling in the forging process are reduced, the mechanical performance of products is further improved, the material consumption of the products is saved, and the service life of a mold of the products is improved.

Description

technical field [0001] The invention relates to a processing method of a semi-shaft of an automobile front axle. Background technique [0002] The rear axle shaft of the automobile is the direct drive for the rotation of the wheels and an important part for the torque transmission of the automobile. When the car is in motion, the torque output by the engine is transmitted to the rear axle shaft of the car through multi-stage transmission, and then transmitted to the wheels by the rear axle shaft of the car to push the car forward or backward. Therefore, the rear axle shaft of the car is working It has the function of bearing impact, alternating bending fatigue load and torsion, which requires the automobile rear axle half shaft to have sufficient iron bending strength, shear strength and good toughness. [0003] At present, the casting process of the semi-shaft flange of the rear axle of the automobile using the pendulum mill is mostly a secondary fire process. Afte...

AI Technical Summary

Problems solved by technology

[0003] At present, the casting process of the semi-shaft flange of the automobile rear axle produced by the pendulum mill is mostly a secondary fire process. After the first heating of the semi-shaft blank of the automobile rear axle, the billet is made by free forging or hydraulic press, which takes a long time. The workpiece dissipates heat quickly during blank making, causing the temperature of the blank to drop to about 600°C after the first heating, and the plasticity of the blank is reduced, which cannot meet the requirements of the pendulum milling process. The second heating cannot meet the requirements of the pendulum milling process, because the semi-shaft blank after the first heating and deformation needs to be heated for the second time

This process has problems such as large scale of forgings, poor surface quality of forgings, high production costs, and low production efficiency.