Spiral spring quenching heat treatment process adopting water-soluble quenching medium

A technology of quenching medium and coil spring, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of low hardenability, hardness, strength, plasticity and fatigue properties, etc., and achieve improved fatigue limit, best strength and Effect of plasticity, refinement of martensitic substructure

Inactive Publication Date: 2015-07-29
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a coil spring quenching heat treatment process using a water-soluble quenching medium, which overcomes the shortcomings of low hardenability caused by oil quenching in the traditional oil quenching and tempering process, poor hardness, strength, plasticity and fatigue performance, and at the same time Avoid the occurrence of oil quenching process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put the 60Si2CrVAT spring steel into the resistance furnace and heat it to 870°C for 30 minutes, then take it out, put it into 5%PAG, 10%PAG, 13%PAG, 15%PAG, 20%PAG and mechanical quenching respectively Quenching treatment is carried out in oil, the temperature of the quenching medium is room temperature, and the medium should be evenly stirred during the quenching process, then tempered in an isothermal furnace at 440°C for 1.5h, and finally cooled to room temperature with oil.

[0015] The performance test results after heat treatment are shown in the table below:

[0016]

[0017] It can be seen from the data in the table that quenching with PAG quenching medium can improve the hardness, strength and plasticity of spring steel more than traditional quenching oil quenching; in addition, after quenching with the above-mentioned concentration of PAG, no quenching cracks appear in the spring steel , through several tests to determine the best use of PAG water-soluble ...

Embodiment 2

[0018] Embodiment 2: adopt the heat treatment process among the embodiment one, quenching medium is changed into 13%PAG and quenching oil, the spring steel after heat treatment is processed into standard fatigue sample respectively, then carry out fatigue test on fatigue testing machine, record and adopt The fatigue limit σ-1 after quenching with 13%PAG quenching medium is 781.5MPa, while the fatigue limit σ-1 after traditional oil quenching is only 713.9MPa, indicating that using 13%PAG as a quenching medium instead of traditional oil quenching can improve the spring steel fatigue performance.

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PUM

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Abstract

The invention discloses a spiral spring quenching heat treatment process adopting a water-soluble quenching medium. The spiral spring quenching heat treatment process comprises the following steps of placing a spiral spring in a resistance furnace and heating to 850DEG C to 900DEG C and keeping the temperature for 30 minutes; then taking out the spiral spring and placing the spiral spring into a PAG (Poly Alkylene Glycol) water-soluble quenching medium for performing quenching treatment; uniformly stirring in the quenching process and enabling the temperature to reduce to room temperature; taking out the spiral spring and placing the spiral spring into an isothermal furnace with the temperature of 440 to 480DEG C and keeping the isothermal state for 1.5 hours; finally, taking out the spiral spring and performing oil cooling to room temperature. According to the spiral spring quenching heat treatment process disclosed by the invention, by using the characteristic that the cooling speed of the PAG water-soluble quenching medium is higher, residual austenitic is reduced, the substructure of a martensitic structure is refined, the separation of carbide along the crystal boundary and the boundary of martensite lath is avoided, and the spiral spring obtains comprehensive mechanical properties superior to those obtained by a traditional oil quenching heat treatment process.

Description

technical field [0001] The invention relates to a heat treatment process for quenching a coil spring in a water-soluble quenching medium, and belongs to the technical field of spring steel heat treatment. Background technique [0002] 60Si2CrVAT spring steel is currently the special material for the coil springs of speed-increasing train bogies in my country, and the improvement of its mechanical properties has always been the focus of research. The spring steel heat treatment process usually adopts oil quenching-medium temperature tempering. In the actual production process, mechanical quenching oil is used as the quenching medium. Due to its low cooling capacity, the spring is often "hardened" and the hardness is low. , the phenomenon of insufficient strength, and in the process of its use, it is often accompanied by burning and emitting a large amount of oily smoke, which has the problems of potential safety hazards and environmental pollution. [0003] PAG water-soluble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D9/02C21D6/00C22C38/24
Inventor 梁益龙姜云徐军雷磊
Owner GUIZHOU UNIV
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