Cold drawn steel was conducted by wire drawing machine. Wire drawing machine has two kinds of chain and the mandrel, general mandrel is often used to wire drawing machine. Cold drawing has been descaling, rolling head, wire drawing process. Rust removal. Wire rod steel surface, usually have a layer of rust oxide, hard, easily damaged wire drawing die, and will make the steel wire drawing generated when the trench or fracture. Plate of round bar in front of the cold drawn, therefore, should first USES the electric resistance wheel or the same as the steel bar diameter of old preliminary cleaning wire drawing die. Reinforced after preliminary cleaning and pickling, remove rust. Pickling, reinforcement in dilute hydrochloric acid, soak for about 20 minutes. Removed after rinse to remove the acid, and then bubble in lime soap water, make the residual acid neutralization in the steel and steel surface lubrication, and wire drawing. The dog. Turn aside rust plate of round bar in the rack, its one end into the dog machine roller intermediate thin, to facilitate through the wire drawing die hole end. Wire drawing. The wire drawing die