Softening method of automobile component part cold extrusion blank

Abstract

A technology for softening the blank of carí»s part to be cold-extruded includes such steps as blanking the hot-rolled circular steel by needed sizes, putting the blank on the holder of production line, isothermal normalizing for softening whole blank, blasting steel balls for removing oxidized scales, phosphorizing, saponifying and cold extruding.

Description

technical field

[0001] The invention relates to a method in the technical field of heat treatment, in particular to a softening method for cold extrusion blanks of auto parts. Background technique

[0002] With the rapid development of the automobile industry, the cold extrusion process at home and abroad has developed greatly, which puts forward new requirements for the performance of cold extrusion billets. It is required that the billet has good plasticity, is easy to flow under a low unit backlog, does not crack when extruded, and has a core hardness of the final heat treatment. It is generally believed that the spheroidized structure is the primary condition for obtaining low unit compressive stress, because the work hardening rate of this structure is low, so the cold backlog performance of the steel is improved. Most of the cold extrusion billets at home and abroad are fully annealed or spheroidized annealing.

[0003] The softening of the cold extrusion billet is t...