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Spring steel wire processing process for increasing fatigue performance of high strength spring steel wire

A technology of spring steel wire and fatigue performance, which is applied in the field of spring steel wire processing technology, can solve the problems such as the negative impact of fatigue life of high-strength spring steel wire, and achieve the effects of reducing impact, improving toughness, and increasing fatigue life

Active Publication Date: 2013-06-05
SHANGHAI SPRING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to solve the problem that the defects in the process and materials in the existing spring production process have a great negative impact on the fatigue life of high-strength spring steel wire, and provide a method to improve the fatigue performance of high-strength spring steel wire Spring steel wire processing technology

Method used

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  • Spring steel wire processing process for increasing fatigue performance of high strength spring steel wire

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Experimental program
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Effect test

Embodiment 1

[0025] Deoxidize the surface of the high-strength spring steel wire first: Pickling can be used to remove the oxide scale on the surface of the material. The concentration of hydrochloric acid is 8%, and the pickling time is 30 minutes. Phosphate after pickling to facilitate drawing. Then it is drawn: the wire rod of a specific specification is drawn through a die, and the drawing ratio does not exceed 40%. Then use the roller to make it straighter. The straighter steel wire material is quenched in an intermediate frequency heating equipment, the heating temperature is controlled at about 900 ℃, and quenching oil or water vapor can be used for cooling. After two times of tempering, the first tempering is in the intermediate frequency heating equipment, and the tempering temperature is controlled at about 350℃; then the surface of the material is tempered twice, and the surface is tempered in the high frequency heating equipment. After tempering, the surface temperature of the...

Embodiment 2

[0027] Deoxidize the surface of the high-strength spring steel wire first: Pickling can be used to remove the oxide scale on the surface of the material. The concentration of hydrochloric acid is 25%, and the pickling time is 5 minutes. Boronization after pickling to facilitate drawing. Then it is drawn: the wire rod of a specific specification is drawn through a die, and the drawing ratio does not exceed 40%. Then use the roller to make it straighter. The straighter steel wire material is quenched in an intermediate frequency heating device. The heating temperature is controlled at about 1050°C, and quenching oil or water vapor can be used for cooling. After two times of tempering, the first tempering is in the intermediate frequency heating equipment, and the tempering temperature is controlled at about 550℃; then the surface of the material is tempered twice, and the surface is tempered in the high frequency heating equipment. After tempering, the surface temperature of th...

Embodiment 3

[0029] Deoxidize the surface of the high-strength spring steel wire: pickling can be used to remove the oxide scale on the surface of the material. The concentration of hydrochloric acid is 15%, and the pickling time is 20 minutes. Boronization after pickling to facilitate drawing. Then it is drawn: the wire rod of a specific specification is drawn through a die, and the drawing ratio does not exceed 40%. Then use the roller to make it straighter. The straighter steel wire material is quenched in an intermediate frequency heating device. The heating temperature is controlled at about 980°C, and quenching oil or water vapor can be used for cooling. After two times of tempering, the first tempering is in the intermediate frequency heating equipment, and the tempering temperature is controlled at about 450℃; then the surface of the material is tempered twice, and the surface is tempered in the high frequency heating equipment. Tempering, the surface temperature of the material i...

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Abstract

The invention discloses a spring steel wire processing process for increasing a fatigue performance of a high strength spring steel wire. The process comprises the following steps: a surface treatment step, wherein the surface treatment step is carrying out surface oxide skin removing on a spring steel wire raw material; a drawing step; a straightening step; a quenching step; a tempering step; a secondary surface tempering step; a surface eddy current defectoscopy step; and an oil taking step. According to the process, the secondary tempering step on the surface of the material is added after quenching and tempering are performed, and a hardness (strength) of a high strength spring material surface layer is slightly reduced so as to improve material surface toughness, reduce affection caused by material defects, and increase a spring fatigue life effect.

Description

Technical field [0001] The invention belongs to the field of material heat treatment, and particularly relates to a spring steel wire processing technology for improving the fatigue performance of a high-strength spring steel wire. Background technique [0002] At present, the domestic steel wire for automobile suspension springs with the highest strength produced by domestic spring steel wire manufacturers has a tensile strength of 2000 MPa and is used for the production of high-demand springs. With the advancement of automobile lightweight requirements, the strength of 2000MPa has become more and more difficult to meet the requirements of automobile manufacturers, and higher strength materials are required. At present, most spring fractures are related to tiny defects on the surface. As the strength of the material is further improved, the sensitivity of the material to defects will be further increased, and the material will be produced in the process of rolling, drawing, tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/06
Inventor 金方杰
Owner SHANGHAI SPRING CORP
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