In daily life, can be seen everywhere the form of spring, so how to improve the service life of spring?
The specific methods are as follows.
1, the isothermal quenching spring
can be used for small diameter or hardenability enough spring isothermal quenching, which can not only reduce, but also can improve the tenacity.
Best again after isothermal quenching tempering, can improve the elastic limit, tempering temperature and isothermal quenching temperature are the same.
2, thermomechanical treatment
thermomechanical treatment is the deformation of steel strengthening and heat treatment strengthening both together, further improve the strength and toughness of steel.
Thermomechanical treatment are high, moderate in low temperatures.
High temperature thermomechanical treatment is produced under the stable state of austenite deformation immediately after quenching, can also be combined with forging or hot rolled, namely thermoforming immediately after quenching.
60 si2mn steel manufacturing automobile plate spring, after the high temperature thermomechanical treatment (
930 ℃ + 18% thermal variables, oil quenching)
Later, with 650 ℃ by 3.
25 min high temperature tempering, and its strength and fatigue life have been greatly improved.
3, spring should be relaxed after quenching and tempering treatment
spring work long time under the action of external force, due to the stress relaxation, produces the trace of permanent (
Plastic)
Spring deformation, especially the high temperature, under high temperature stress relaxation phenomenon is more serious, reduce the precision of the spring, the general
precision spring is not allowed.
Therefore, this type of spring should be relaxed after quenching and tempering treatment.
Heat treatment process: the spring preload, make its deformation than the spring work possible deformation.
Then work in the above temperature 20 ℃ under the condition of heating, heat preservation 8 ~ 24 h.
4, shot blast
spring requires a higher surface quality and surface defects such as scratches, folding, oxidation decarburization tend to become spring work place of stress concentration and fatigue fracture source.
Shot peening treatment is currently the most widely used one method to improve the surface quality of the spring.
If with tiny high-speed spray the surface of the spring, steel shot peening treatment, not only improve the surface quality of the spring, to improve the surface strength, make the surface in the compressive stress state, and thus improve the spring fatigue strength and service life.
5, low temperature carbonitriding
for the coil spring and low temperature tempering carbonitriding (
Soft nitriding)
Technology, combining can significantly increase the fatigue life and corrosion resistance of spring.
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