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Several methods to improve the service life of fine springs.old thimbles price

source:Industry News    Popular:pogo pin for moilble phone     release time:2021-11-19 09:18:59     Article author:sznbone

  

Several methods to improve the service life of fine springs.old thimbles price(图1)

  1) Deformation heat treatment

  Thermomechanical heat treatment combines the deformation strengthening and heat treatment strengthening of steel to further improve the compressive strength and ductility of steel. Thermomechanical heat treatment can be divided into high temperature, medium and soft ultra-low temperature. High temperature deformation heat treatment is quenched immediately after deformation caused by stable martensite, and can also be combined with forging or hot rolling, that is, quenched immediately after hot forming. Vehicle leaf springs made of 60Si2Mn steel are subjected to high temperature deformation heat treatment (930℃ thermal independent variable 18%, oil quenching), and then quickly tempered at a high temperature of 650℃×3.25min. Their compressive strength and fatigue life can be obtained. Very big improvement.

  (2) Isothermal quenching of the spring

  For springs with small diameters or sufficient cutting performance, isothermal quenching can be used. It can not only reduce empathy, but also improve ductility. After quenching in the isothermal process, it is best to perform tempering again to increase the ductility limit. The tempering temperature is the same as the quenching temperature in the isothermal process.

  (3) Shot peening

  Shot peening is one of the most common ways to improve the surface quality of springs at this stage. Springs are required to have high surface quality. Surface defects such as scratches, expansion, air oxidation and carburization will usually become stress areas and fatigue and rupture sources during spring operation. If the surface of the spring is quickly sprayed with fine steel balls and shot peening is carried out, it will not only improve the surface quality of the spring, increase the surface compressive strength, make the surface under compressive stress, and increase the fatigue limit and service life of the spring.

  (4) Solving the relaxation of the spring

  When the spring works under the action of external force for a long time, due to stress relaxation, it will cause a small amount of permanent (plastic deformation) deformation, especially the spring working at high temperature, the stress relaxation condition is more serious at high temperature, which reduces the precision of the spring. This is not allowed for general high-precision springs. Therefore, this type of spring should be relaxed after quenching and tempering. Heat treatment process: load the spring in advance so that its deformation exceeds the deformation that is likely to be caused when the spring is in operation. Then it is heated under the standard of 20℃ higher than the operating temperature, and heat insulation is 8~24h.


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