1, in order to heat the wire to the appropriate temperature, to maintain a certain period of time, and then slowly cool, in order to adjust the crystalline tissue, reduce hardness, screw manufacturers to improve the wire processing performance at room temperature;
2, in order to remove the surface of the wire oxide film, screw manufacturers will form a layer of phosphate film on the metal surface, in order to reduce wire pumping line and cold pier or forming and other processing process, the abrasion of the mold;
3, The wire through the cold forging (or hot forging), in order to achieve the shape and length (or thickness) of the semi-finished product, the wire stuck in the shear mold into the shape of screws.