Spring is an elastic mechanical parts to work. Parts made of elastic material is deformed under external force, the external force is removed after restitution. Also known as "spring." Generally made of spring steel. Complex and diverse types of spring, according to the shape of points, there are coil springs, spiral springs, leaf springs, shaped spring. According to the nature of the force, the spring can be divided into tension springs, compression springs, torsion springs and bent springs, disc springs can be divided according to the shape of the ring springs, leaf springs, coil springs, truncated cone spiral spring and torsion bar springs, etc. , according to the production process can be divided into cold and hot rolled coil springs spring. Ordinary cylindrical spring due to manufacturing simple, and can be made into various types according to loading conditions, the structure is simple, it is most widely used. Spring manufacturing materials in general should have a high elastic limit, fatigue limit, toughness and good heat performance, commonly used carbon spring steel, alloy spring steel, stainless spring steel and copper alloys, nickel alloys and rubber and so on. The method of manufacturing a spring cold roll and hot roll method. Spring wire diameter of less than 8 mm cold roll method generally greater than 8 mm with a hot roll method. Some also were made in the spring pressure or shot peening can increase the carrying capacity of the spring. Dacromet processing, environmental protection Dacromet processing, black Dacromet processing www.czrhdkl.top