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Thermal treatment process for spring steel PAG water-soluble quenching medium for band spring of automotive vehicle

A technology for automotive steel plates and quenching media, applied in heat treatment furnaces, heat treatment equipment, quenching agents, etc., can solve the problems of small thermal stress and structural stress of workpieces

Inactive Publication Date: 2009-05-13
长沙胜通汽配科技股份有限公司
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  • Summary
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AI Technical Summary

Problems solved by technology

[0003] The invention relates to a PAG water-soluble quenching medium heat treatment process for automobile leaf spring SiMn series spring steel. Minimize the thermal stress and tissue stress of the workpiece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] Heat treatment production process of automobile rear leaf spring (EQ140 rear assembly)

[0015] Heat treatment technical requirements:

[0016] Leaf spring material: 60Si2Mn

[0017] Leaf spring specification: 16*75

[0018] Leaf spring hardness: HRC40.5~47

[0019] Metallographic structure of leaf spring: 1-5 grade tempered troostite

[0020] For other technical requirements, see GB / T19844-2005 "Leaf Spring" standard and drawing requirements.

[0021] The heat treatment production process steps are as follows:

[0022] 1. PAG water-soluble quenching medium configuration and supporting use

[0023] 1. Configure PAG water-soluble quenching medium, the concentration is controlled at 10-13%.

[0024] 2. Turn on the stirring circulation system and cooling system installed in the quenching tank to stir the PAG water-soluble quenching medium, stir for about 15 minutes or longer, extract the prepared medium samples from different positions in the quenching tank, and use ...

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Abstract

The invention relates to a process for carrying out heat treatment on spring steel PAG of an automobile steel plate spring SiMn system through a water-soluble quenching medium. The process utilizes the reversibility of an aqueous solution of a PAG polymer; when hot metal is immersed and quenched in quenching liquid, a coating layer enclosed by the metal-rich PAG polymer controls the radiation speed of the surface of the metal; the aim of the process is to solve the increase of hardenability of the spring steel of the SiMn system with thick specification in quenching, thereby ensuring that large quench hardening depth is obtained in quenching while the thermal stress and the structural stress of a workpiece are smallest.

Description

technical field [0001] The invention relates to a PAG water-soluble quenching medium heat treatment process for an automobile leaf spring SiMn series spring steel, belonging to the technical field of metal heat treatment. Background technique [0002] Because the quenching medium of traditional SiMn spring steel is mechanical quenching oil, but the relatively low cooling rate of mechanical quenching oil medium, the hardenability of SiMn spring steel with a thickness of 16mm or more is low, so SiMn spring steel is selected for quenching Material specifications are narrow in the range that warrants hardenability. And the mechanical quenching oil is easy to break the chemical organic chain due to the high temperature after a period of heat treatment, the chemical composition is unstable, resulting in uneven quenching of the spring steel, forming quenching stress and causing large deformation and other defects. At the same time, it is not easy to detect the cooling rate of the ...

Claims

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Application Information

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IPC IPC(8): C21D9/02C21D1/58
Inventor 罗伟罗小红屈壮
Owner 长沙胜通汽配科技股份有限公司
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