Spring material selection of several major points of attention!
The choice of spring material should be determined according to the nature of the spring load, working temperature, stress state, service life, requirements for conductive magnetization, process performance, stress size, environmental medium, material source and price.
Spring material selection of several major points of attention
Steel leaf spring generally use 55SiMnVB, 55SiMnMoV, 55Si2Mn, 60Si2MnA, 60CrMnB, 60CrMn grade grades of flat steel.
Medium and small spring, especially the spiral tension spring, should be given priority to the steel wire, lead bath and other cold cold drawn steel wire and oil quenched and tempered steel wire, its strength, high surface quality, fatigue performance higher than the ordinary quenching back Fire wire, and the process is good, simple processing, quality and stability. Large and medium-sized springs, for the load accuracy and stress are high, should be used cold drawn or cold drawn polished steel; for the load accuracy and stress is low, the choice of hot-rolled steel.
To the spring itself as a conductor of the electrical spring or in the humidity of the variable conditions, such as water (including seawater), water vapor work in the spring, the general use of copper and gold steel.
In the acid contact with other corrosive medium under the work of the spring, the general use of stainless steel or nickel alloy corrosion resistant materials. In the general environment of the media under the conditions of the use of spring, the choice of ordinary spring steel, made of spring after its surface for rust coating or plating (galvanized, cadmium, copper) method of corrosion.
In the use of the instrument in the instrument and the instrument, in order to meet its accuracy from the impact of temperature changes, the general choice of elastic modulus and expansion coefficient of minimal change in the constant elastic alloy.
In the requirements of light, insulation, anti-collision, anti-corrosion and other special-purpose spring, optional reinforced plastic. Can also use anti-vibration rubber to create various types of rubber springs.
2. characteristic factors
Strength, hardness and the plane strain fracture toughness of a great relationship, therefore, its selection should be based on spring bearing nature and stress size.
Hardenability, spring material cross-section is hardened and the degree of hardening, the great relationship between the quality of the spring.
Special type, coil spring material cross-section, should be preferred circular cross-section. Square and rectangular cross-section material, although the ability to withstand strong, good impact resistance, but the material source is small, and the price is high, in addition to special needs, the general try not to use this material.
3. Temperature factors
In the high temperature work of the spring material, requires a better strength of the thermal stability, anti-relaxation or creep ability, antioxidant capacity, resistance to a certain degree of dielectric corrosion.
The use of spring materials at low temperatures should have good low temperature toughness. Carbon spring steel wire, piano wire and 1Cr18Ni9 and other austenitic stainless steel spring steel wire, copper alloy, nickel alloy has good low temperature toughness and strength. Because at low temperatures, the brittleness of the material is very sensitive to surface defects. Environmental media is much less corrosive to the material than in the greenhouse, and galvanized and galvanized easily cause cold and brittle. The elastic modulus and the expansion coefficient of the material do not change much, which can not be considered in the design.
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