A way to improve the mass of a spring

There are several ways to improve the quality of spring:

(1) spring isothermal quenching for small diameter or sufficient hardenability of the spring can be used isothermal quenching, it can not only reduce the change of heart, but also can improve the strength and toughness.

(2) heat treatment deformation heat treatment deformation is the deformation strengthening and heat treatment strengthening combination of steel, further improve the strength and toughness of steel. Thermomechanical treatment with 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%, hot sex variable oil quenching), using 650 ℃ by 3.25 min high temperature tempering, the strength and fatigue life have been greatly improved.

(3) spring relaxation process of spring for a long time work under external force, due to the stress relaxation, will produce the permanent (plastic) deformation trace, especially the spring high temperature work, stress relaxation phenomenon is more serious at high temperature, reduce the precision of the spring, it is not allowed for general precision spring. Therefore, this kind 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) the shot peening treatment shot peening treatment is currently the most widely used one of way to improve surface quality of the spring. 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. 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, so as to improve the spring fatigue strength and service life.

(5) low temperature carbonitriding combined with tempering and low temperature carbonitriding (soft nitriding) can significantly improve the fatigue life and corrosion resistance of the spring