Material requirements for making inclined coil springs

Skew coil spring application field skew coil spring modeling skew coil spring is a mechanical part that uses elasticity to work. A part made of elastic material will deform under the action of an external force and will return to its original state when the external force is removed. The types of skew coil springs are complex and diverse. According to their shapes, they can be divided into spiral skew coil springs, vortex coil skew coil springs, plate skew coil springs, special-shaped skew coil springs, etc. Generally made of inclined ring spring steel. So what are the requirements for the material of the inclined coil spring?

1. High intensity

In order to improve the anti-fatigue damage and anti-relaxation ability of inclined coil spring, the material of inclined coil spring should have high yield strength and elastic limit, especially high bending ratio. In general, the elastic limit of the material is directly proportional to the yield strength, so the design and manufacture of inclined coil springs always want the material to have a high yield strength.

2. Good plasticity and toughness

In the manufacturing process of inclined coil spring, the material needs to undergo different degrees of machining deformation, so the material is required to have certain plasticity. For example, the shape of the complex stretching and torsion of the carabiners and torsion arms of the inclined coil spring, when the radius of curvature is very small, in the processing of winding or stamping bending forming, the inclined coil spring material shall not appear cracks, damage and other defects. At the same time, when the inclined coil spring is under impact load or variable load, the material should have good toughness, which will be of great benefit to improve the service life of the inclined coil spring 3. Excellent surface condition and fatigue performance

Helical coil spring under the surface of the work stress increase, and fatigue failure often starts from the surface of steel wire, for use in the important occasions of oblique ring spring such as valve spring, valve oblique coil spring and suspension coil spring are required to have millions of times, even tens of millions of times more long cycle life, it's on the material fatigue performance of the high demands are put forward. There are many factors affecting the fatigue performance of materials, such as the chemical composition of materials, hardness, purity of steel, surface quality and metallographic structure, especially the surface quality of materials.

4. Strict size

Many skew coil springs have higher requirements on load accuracy, such as the valve skew coil spring load deviation shall not be greater than 5 percent to 6 percent of the specified load, with a round wire pull, pressure skew coil spring as an example, if the wire diameter deviation is 1 percent, the load will produce about 4 percent deviation. It can be seen that strict dimensional accuracy is also very important to ensure the quality of the inclined coil spring.

5. Good uniformity

The uniformity requirement of materials refers to the uniformity and stability of the chemical composition, mechanical properties, size deviation and other indicators of materials. If the performance of all aspects of the material is inconsistent, it will bring great difficulties to the production of inclined coil spring, resulting in the dispersion of product parameters such as geometric size, hardness and load, and serious non-uniformity will even cause waste products.