Inclined coil spring: The working temperature needs to be considered when selecting the spring material

Inclined coil spring: Choose the spring material need to consider the operating temperature! Today, Du Shi Cheng Fa precision with you to explain it!

With the increase of spring operating temperature, the elastic modulus, flexural stiffness and bearing capacity of spring materials decrease. Therefore, the spring working at high temperature must master the elastic coefficient of the elastic modulus, and calculate the harm of reducing the bearing capacity of the spring to the performance index. When the normal coil spring operating temperature is more than 60°, adjust the shear modulus to solve the problem.

The spring material used at low temperature should have good ductility at low temperature. Carbon spring wire, electronic organ wire, 1Cr18Ni9, copper alloy, nickel base alloy and other low alloy steel spring wire has good low temperature ductility and compressive strength.

At low temperature, the ductility of materials is very sensitive to surface defects, so the surface quality of materials should be strictly required.

At low temperature, the corrosion degree of the material from the natural environment is much lower than that of the greenhouse, and cadmium and hot-dip galvanizing in the plating process are prone to brittle fracture.

At low temperature, the elastic modulus and expansion coefficient of the material do not change much and cannot be considered in the formulation.

The choice of hardness and compressive strength of spring steel spring depends on the bearing characteristics and internal stress, and the relative height of hardness is closely related to the fracture toughness of plane stress.

It can be seen from the curve correlation that the plane stress fracture toughness value seems to decrease with the increase of hardness. That is, when the spring hardness value is clear, the spring hardness value should be lower under the conditions specified in the spring characteristics.

Spring manufacturers remind: in the selection of spring material, we should pay attention to the cutting performance of stainless steel plate, the cross section of spring material is not hard bottom and quenching level, which has a great relationship with the quality of the spring.

There are many manufacturing processes for springs, but their main forms are inch: There are two main processes, cold forming and hot forming. In the spring cold forming process, the spring is mainly made of oil toughening, lead bath quenching and tempering spring wire, cold-drawn spring wire and other materials, the use of such materials in the process of manufacturing spring generally do not need special heat treatment, only need to eliminate stress, the use of spring design working stress and material properties. Spring cold forming process is generally suitable for small wire diameter, or the shape of complex special-shaped spring, such as wire diameter less than 15mm of various clamping spring, tension spring, torsion spring, convex spring, concave spring, arc spring. The cold forming process is simple and avoids the deformation and decarbonization caused by reheat treatment.