The manufacturing process of metal wire mainly includes two key steps: wire drawing and annealing. Wire drawing is the process of passing a metal blank through a series of gradually decreasing-sized drawing dies, causing its diameter to gradually decrease and its length to increase. During this process, the grain structure of the metal deforms, leading to an increase in the strength and hardness of the metal wire, but also potentially increasing its brittleness. Therefore, annealing is usually required after wire drawing. This involves heating the wire to an appropriate temperature and holding it for a certain time, followed by slow cooling to eliminate internal stress and restore its toughness and ductility.
