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A Grading Treatment Method for Improving Spring Fatigue Life

A technology of hierarchical processing and fatigue life, which is applied in the field of spring manufacturing, can solve the problems of difficult guarantee of spring fatigue life, achieve simple implementation, obvious effect, and improve the effect of spring fatigue life

Active Publication Date: 2016-01-20
JIANGXI CHANGHE AVIATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in actual production, especially when the design load exceeds the allowable stress level of the material, the fatigue life of the spring is difficult to guarantee

Method used

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  • A Grading Treatment Method for Improving Spring Fatigue Life
  • A Grading Treatment Method for Improving Spring Fatigue Life

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] To make a compression spring, the free state length of the spring H 0 =40mm, the initial installation length of the spring H 1 =36mm, the maximum working length of the spring H 2 =24mm, the working temperature of the spring is not higher than 100℃. The graded processing technology of the spring is as follows:

[0021] The first step is to use the steel wire to wind the preliminary spring with a margin, the length of the preliminary spring H=45mm;

[0022] The second step is to perform the first treatment after heat treatment of the preliminary spring, that is, compress the heat-treated spring to a length of 40mm, and maintain the compressed state for 2 hours at a temperature of 200-250°C;

[0023] In the third step, after surface treatment of the spring after the first treatment, a second treatment is performed, that is, the spring after the surface treatment is compressed to a length of 35mm, and the compressed state is maintained for 3h at a temperature of 150-200°C;

[0024]...

Embodiment 2

[0027] To make a certain tension spring, the free state length of the spring H 0 =100mm, the initial installation length of the spring H 1 =120mm, the maximum working length of the spring H 2 =180mm, the working temperature of the spring is not higher than 70℃. The graded processing technology of the spring is as follows:

[0028] The first step is to use the steel wire to wind the preliminary spring with a margin, and the length of the preliminary spring H=100mm;

[0029] The second step is to perform the first treatment after heat treatment of the initial spring, that is, stretch the heat-treated spring to a length of 105mm, and maintain the compressed state for 2 hours at a temperature of 200-250°C;

[0030] In the third step, after the surface treatment of the spring after the first treatment, a second treatment is performed, that is, the spring after the surface treatment is stretched to a length of 125mm, and the compressed state is maintained for 3 hours at a temperature of 15...

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Abstract

The invention belongs to the technical field of spring manufacture, and relates to a stage treatment method for improving the fatigue life of a spring. By the adoption of the method, as the spring in three typical working states is separately subjected to stabilizing treatment, the stress balance state in a specific state is realized; therefore, the purpose of prolonging the service life of the spring is realized. The invention provides a brand new technical method to prolong the fatigue life of the spring; the scheme is implemented quite simply, but the effect is obvious.

Description

Technical field [0001] The invention belongs to the technical field of spring manufacturing and relates to a grading treatment method for improving the fatigue life of a spring. Background technique [0002] For how to improve the fatigue life of springs, there has been a relatively complete system. The main methods are: shot peening of the spring surface, reasonable selection of materials, selection of appropriate heat meter treatment parameters, and improvement of spring workmanship. However, in actual production, especially when the design load exceeds the allowable stress level of the material, the fatigue life of the spring is difficult to guarantee. Summary of the invention [0003] The purpose of the present invention is to provide a graded treatment method for improving the fatigue life of the spring. [0004] The technical scheme of the present invention is: [0005] The method performs stabilization treatments under the three typical working states of the spring to achieve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21F35/00
Inventor 王宝龙刘苗洪坤巍张鹏张瑜彭欢
Owner JIANGXI CHANGHE AVIATION IND
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