The new website of Xingfa spring is officially opened. Thousands of sail race. Our age is an era full of competition and innovation. In line with the management concept of "people-oriented, honesty first, pioneering and innovating, pursuing excellence", the company promotes the development of enterprises from the connotation and extension, improves quality, standardizes management, promotes scientific and technological progress, improves the core competitiveness of enterprises, and maintains the sustainable and rapid development of enterprises in the fierce market competition. 

　　The wire for car suspension spring has strict requirements for cleanliness, dimensional accuracy and surface quality of steel. Practice has proved that the diameter accuracy of wire rod is of great significance for reducing wear of drawing die, reducing energy consumption, reducing wire breakage and ensuring drawing stability. The diameter tolerance of wire rod for suspension spring is controlled at + 0.2mm, and the ellipticity is less than 60% of diameter tolerance. Cracks, folds and scratches on wire surface seriously affect the quality of steel wire and reduce the fatigue life of suspension spring. Wire surface should be smooth, no cracks, folding, scarring, ears and so on. Local defects such as bumps, pits and hemp should not be larger than 0.10mm. Wire rod has good mechanical properties and small fluctuation. Tensile strength fluctuation of wire rod is less than 40 MPa, section shrinkage fluctuation is less than 15%, volume fraction of sorbite is more than 85%. Free ferrite has great influence on fatigue life. Volume fraction should be controlled within 1.5%, grain size should be above 8 grade, and martensite should not be found.

Spring blackening process Blackening by alkaline chemical oxidation treatment is to heat the qualified springs processed in concentrated alkali solution, so that a thin dense oxide film can be obtained on the surface of the springs, which has anti-corrosion effect.

(1) cold forming process of spring 1) cold forming process automation capability. The cold forming machine has been developed to 12 claw. The steel wire in the range of (0.3 ~ 14) mm is basically formed on the 8 jaw forming function. At present, the development direction of forming process equipment is: (1) increasing the forming speed, the main trend is to increase the forming speed of the equipment, that is, the production efficiency. (2) improve the durability of equipment by improving the precision of equipment parts and strengthening the heat treatment effect. Third, add length sensors and laser rangefinder to make automatic closed-loop control manufacturing process for CNC forming machine.