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Measures to improve the service life of precision springs.Electronic connector price

source:Industry News    Popular:pogo pin for moilble phone     release time:2021-11-25 09:45:54     Article author:sznbone

  

Measures to improve the service life of precision springs.Electronic connector price(图1)

  At present, precision springs are more and more widely used, and the quality of each manufacturer is also different, and the life of each precision spring is also different, so how to improve the life of the precision spring? The following methods can be used.

  Austempering of springs: Austempering can be used for springs with small diameters or sufficient hardenability, which can not only reduce decentering, but also improve strength and toughness. It is best to perform another tempering after austempering to increase the elastic limit. The tempering temperature is the same as the austempering temperature.

  Spring relaxation treatment: The spring works under the action of external force for a long time, due to the stress relaxation, it will produce a small amount of (plastic) deformation, especially the high temperature working spring, the stress relaxation phenomenon is more serious at high temperature, which reduces the accuracy of the spring. This is not allowed for general precision springs. Therefore, this type of spring should undergo relaxation treatment after quenching and tempering. Heat treatment process: pre-load the spring so that its deformation exceeds the deformation that may occur when the spring is working. Then heat it at 20℃ higher than the working temperature for 8~24h.

  Thermomechanical heat treatment: Thermomechanical heat treatment combines the deformation strengthening and heat treatment strengthening of steel to further improve the strength and toughness of steel. Thermomechanical treatment is divided into high temperature, medium temperature and low temperature. High temperature deformation heat treatment is quenching immediately after deformation occurs in a stable austenite state, or can be combined with forging or hot rolling, that is, quenching immediately after hot forming. The automobile leaf spring made of 60Si2Mn steel undergoes high temperature deformation heat treatment (930℃+thermal variable 18%, oil quenching), and adopts high temperature rapid tempering at 650℃×3.25min, and its strength and fatigue life have been greatly improved.

  Shot peening: Shot peening is currently one of the most widely used methods to improve the surface quality of springs. Springs require high surface quality, and surface defects such as scratches, folds, and oxidative decarburization tend to become stress concentration places and fatigue fracture sources during spring operation. If small steel shots are used to spray the surface of the spring at high speed for shot peening, it will not only improve the surface quality of the spring, increase the surface strength, and put the surface in a state of compressive stress, thereby increasing the fatigue strength and service life of the spring.


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