1. The suspension spring with variable spring outer diameter, variable pitch and variable steel wire diameter (three changes) realizes non-forming processing.

2. The hollow stable spring rod is made of low carbon boron steel plate by rolling and welding.

3. The torsion bar is made of high-purity 45 steel, and the surface hardness and residual compressive stress are obtained by high-frequency quenching.

4. The leaf springs widely used in electronic products are basically formed by stamping and automatic bending.

5. The valve spring mainly develops multi-stage shot peening and liquid nitriding technology.

These are the requirements of Wei Yi hardware spring for its own technology.