1. High strength
In order to improve the fatigue failure and anti-relaxation function of the beveled coil spring, the beveled coil spring material should have a high yield strength and elastic limit, especially a high yield strength ratio. In general, the elastic limit of the material is proportional to the yield strength, so the design and manufacturer of the bevel coil spring always expect the material to have a high yield strength.
2. Good plasticity and resistance
In the production process of beveled coil springs, the material needs to be processed and deformed to varying degrees, so the material needs to have a certain degree of plasticity. For example, when the tortuous radius is very small, when the tortuous radius is very small, the beveled coil spring material should not show defects such as cracks and folding when processing winding or stamping and zigzag. At the same time, when the bevel coil spring is subjected to shock load or variable load, the material should have good resistance, which is of great benefit to improve the service life of the bevel spring.
3. Excellent appearance condition and fatigue performance
When the inclined coil spring is working, the external stress is large, and the fatigue failure often starts from the appearance of the steel wire. Regarding the inclined ring springs, valve inclined coil springs, suspension bevel springs and other oblique ring springs used in important occasions, there are hundreds of thousands, thousands or more cycle life, which puts forward high requirements for the fatigue performance of the material. There are many factors that affect the fatigue properties of materials, such as chemical composition, hardness, purity of steel, surface quality and metallographic structure, especially the surface quality of materials.
4. Strict size
Many inclined coil springs have high requirements for load accuracy, such as the load error of the valve inclined coil spring should not be greater than 5% ≤6% of the specified load, taking the wire rope tension ring spring as an example, when the wire diameter error is 1%, the error of the load is about 4%, it can be seen that strict dimensional accuracy is also very important to ensure the quality of the beveled coil spring.
5. Good consistency
The requirements for material uniformity refer to the uniformity and stability of the chemical composition, mechanical function, dimensional error and other indicators of the material, if the function of the material is inconsistent, it will bring great difficulties to the production of the beveled coil spring, forming the dispersion of product geometric dimensions, hardness, load and other parameters, serious inhomogeneity and even the waste of the product.
