1, non-magnetic spring isothermal quenching with a small diameter or plenty of hardenability spring, can using isothermal quenching, not only can reduce the change of the center, it can improve strength and toughness after isothermal quenching, best again temper, in order to improve the elastic limit and isothermal quenching tempering temperature is the same.
2, thermal mechanical processing
the thermal deformation of mechanical processing is strengthening and heat treatment strengthening combination, further improve the strength and toughness of steel.
Thermal mechanical processing can be divided into high, moderate in low temperatures.
High temperature thermal mechanical processing is under the stable state of austenite deformation immediately after quenching, can also be combined with forging or hot rolled, namely hot forming immediately after quenching, non-magnetic spring after high temperature deformation and heat treatment, under the high temperature of 650 ℃ tempering quickly, greatly improve the strength and fatigue life.
3, non-magnetic spring relaxation process when playing yellow long-term work under external force, because of the stress relaxation, will cause the small amount of permanent deformation, especially in the work under the high temperature yellow.
High temperature stress relaxation phenomenon is more serious, reduces the accuracy of spring, this is not allowed by the average
precision spring.
Therefore, the spring should be relaxed after quenched and tempered.
Heat treatment process: the spring preload, make the deformation more than non-magnetic spring possible deformation at work, then work in higher than the temperature of 20 ℃ temperature heating, 8 -
24 hours.
4, shot peening
shot peening treatment is to improve the surface quality of non-magnetic spring one of the most commonly used method, surface defects such as scratches, folding, oxidation and decarburization is often the root of the part of the stress concentration and fatigue fracture.
Using high speed small steel shot peening was carried out on the surface of the spring processing, can improve the quality of the surface of the spring, increased the strength of the surface of the spring, spring surface in compressive stress state, so as to improve the fatigue strength and service life of spring.
5, low temperature carbonitriding
and low temperature tempering carbonitriding (
Soft nitriding)
Could significantly increase the fatigue life of non-magnetic spiral spring and corrosion resistance.
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