Softening method of automobile component part cold extrusion blank

A technology of auto parts and cold extrusion, which is applied in the field of heat treatment, can solve the problems of long production cycle, low hardness of heat treatment core, and low efficiency

Active Publication Date: 2006-04-12
SHANGHAI AUTOMOBILE GEAR WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies and defects in the prior art, the present invention provides a softening method for cold-extruded blanks of auto parts, which solves the problems of low hardness at the core of the final heat treatment, long production cycle, and low efficiency, reduces costs, and is beneficial to large-scale production. batch industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Adopt the present invention to the transmission output shaft of the cold extrusion of 20MnCr5 material and just adopt the isothermal normalizing process to carry out the softening treatment of blank to it, concrete process and result are as follows:

[0032] The Φ38 20MnCr5 round steel is blanked by a sawing machine according to the process requirements, placed vertically on the material rack of the isothermal normalizing production line, heated to 930°C by isothermal normalizing, kept for 2.5 hours, and controlled air cooling to 620°C for 1.5 hours , out of the oven and air-cooled. The hardness of the obtained billet is 160-165HB, and the metallographic structure is uniform pearlite; the surface is descaled on the shot blasting machine; the phosphorus saponification treatment is carried out using the phosphorus saponification production line, and the temperature of the phosphating solution is controlled within the range of 90±10°C , The phosphating time is about 15 min...

Embodiment 2

[0036] Adopt the present invention to the transmission input shaft of the cold extrusion of 16MnCr5 material and just adopt the isothermal normalizing process to carry out the softening treatment of blank to it, concrete process and result are as follows:

[0037] The Φ38 16MnCr5 round steel is blanked by a sawing machine according to the process requirements, placed vertically on the material rack of the isothermal normalizing production line, heated to 960°C by isothermal normalizing, kept for 1.5 hours, and controlled air cooling to 580°C for 2 hours , out of the oven and air-cooled. The hardness of the obtained blank is 165-170HB, and the metallographic structure is uniform pearlite; the surface is descaled on the shot blasting machine; The melting time is about 15 minutes, and saponification treatment is carried out for 5 minutes after washing with water, and finally the billet is dried; after the cold extrusion forming treatment on the four-column press, all non-destruct...

Embodiment 3

[0039]Adopt the present invention to the transmission output shaft of the cold extrusion of 20CrMoH material just adopted isothermal normalizing process to it has carried out the softening treatment of billet, concrete process and result are as follows:

[0040] The Φ43 20CrMoH round steel is blanked by a sawing machine according to the process requirements, placed vertically on the material rack of the isothermal normalizing production line, heated to 900°C by isothermal normalizing, kept for 2 hours, and controlled air cooling to 660°C for 2.5 hours , out of the oven and air-cooled. The hardness of the obtained billet is 160-165HB, and the metallographic structure is uniform pearlite; the surface is descaled on the shot blasting machine; the phosphorus saponification treatment is carried out using the phosphorus saponification production line, and the temperature of the phosphating solution is controlled within the range of 90±10°C , the phosphating time is about 15 minutes,...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D11/00
Inventor 白云岭宦有佩尚培文张晖孙华标
Owner SHANGHAI AUTOMOBILE GEAR WORKS
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