Method for spring sizing by using metal transition superplasticity

A metal phase transformation and superplastic technology, applied in furnaces, heat treatment equipment, heat treatment furnaces, etc., can solve problems such as unqualified spring size, and achieve the effect of small stress

Active Publication Date: 2009-03-25
HARBIN TURBINE
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  • Abstract
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Problems solved by technology

[0004] The invention provides a method for spring shape correction using metal phase transfo

Method used

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  • Method for spring sizing by using metal transition superplasticity

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specific Embodiment approach 1

[0006] Specific implementation mode 1: This implementation mode is completed by the following steps: 1. Use tools and process equipment to continuously apply force to the out-of-tolerance part of the spring to fix it within the tolerance range; 2. Put the spring together with the tools into the furnace for heat treatment, The spring undergoes a phase change during the heat treatment process, and the spring utilizes the superplasticity of the spring to undergo plastic deformation during the phase change; 3. Remove the process equipment after being released from the furnace.

specific Embodiment approach 2

[0007] Embodiment 2: The tools and process equipment in this embodiment are hammer iron and wedge iron. Use a hammer to insert a wedge iron between the spring coils so that the spring is in a state of free length.

specific Embodiment approach 3

[0008] Embodiment 3: The heat treatment in this embodiment is normalizing, quenching and tempering, wherein the tempering temperature is 440° C., and the holding time is 2 hours.

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Abstract

The invention provides a method which utilizes metal transition super-plasticity to carry out spring sizing, which relates to a method for sizing the shape of a spring and solves the problem that the size is not qualified due to the distortion of the spring. The method utilizes tools and technique equipment to apply force continuously on the parts size of which is out-of-tolerance so as to fix the size to the tolerance limits; the spring and the tools are put into a furnace to carry out heat treatment, during the heat treatment, phase transition happens to the spring and the spring utilizes the super-plasticity that the spring has during the phase transition to carry out plastic deformation; the tools are removed after the spring and the tools are taken out of the furnace. The method utilizes phase transition superplasticity during normal heat treatment to carry out sizing, needs small strain and no other heat treatment procedures and can fulfill the purpose of sizing during normal heat treatment process.

Description

technical field [0001] The invention relates to a method for correcting the shape of a spring. Background technique [0002] The superplasticity of metals generally refers to the phenomenon that the tensile deformation elongation of materials exceeds 100% under the action of ultra-low loads. Phase transformation superplasticity is a kind of metal superplasticity, which is the superplasticity that metals have during the phase transformation process. , which is characterized in that the metal in phase transition has extremely high plasticity and extremely small plastic deformation stress. [0003] The spring needs to go through the heat treatment process of phase transformation such as quenching and tempering. No matter whether the size is qualified before heat treatment, all the quenched springs will be deformed and the size is unqualified, so the shape must be corrected. The existing spring calibration methods are generally the method of adding force in the cold state, the ...

Claims

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Application Information

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IPC IPC(8): C21D9/02B21D3/00
Inventor 高枝森王淑新贾锦虹王有铭王海凤王永杰
Owner HARBIN TURBINE
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