Softening method of auto parts cold extruding billet

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

Inactive Publication Date: 2017-05-10
CHONGQING QINGYI MOLD MFG
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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 method for softening 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 blank 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 95±5°C , The phosphating time is about 20 minut...

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 950°C by isothermal normalizing, kept for 1.5 hours, and controlled air cooling to 590°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 20 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, first heated to 905°C by isothermal normalizing, kept for 2 hours, and controlled air cooling to 660°C for 2 hours , out of the oven and air-cooled. The hardness of the obtained blank 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 95±5°C , the phosphating time is about 20 minute...

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Abstract

The invention relates to the technical field of heat treatment, and concretely relates to a softening method of an auto parts cold extruding billet. The softening method of the auto parts cold extruding billet adopts an isothermal normalizing process for softening the cold extruding billet at a hot rolling state, and comprises the concrete steps of firstly, blanking, and cutting hot-rolled round steel into the billet with the required specification; secondly, feeding, and placing the billet on a material rack of a production line; then carrying out isothermal normalizing treatment on the billet, i.e. entirely softening the billet so as to enable the billet to be sufficient in structure transformation and uniform in hardness; shot blasting the surface of the billet through a steel ball, and removing oxide skin; carrying out phosphorus saponification treatment, i.e. softening the surface of the billet; and finally, extrusion forming the billet, and carrying out flow detection on a cold extruding product. The softening method of the auto parts cold extruding billet provided by the invention solves the problems of low final heat-treatment core hardness, long production cycle and low efficiency, and is beneficial for cost reduction and industrial production in large volumes.

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): C21D1/28C23C22/07
CPCC21D1/28C23C22/07
Inventor 张小莉
Owner CHONGQING QINGYI MOLD MFG
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