1) Surface pretreatment: For the wire with a dirty surface and many impurities, it must be cleaned and dried before drawing; for the wire with more oxide scale on the surface, it must be acid-fine and dried first. Then pull it out; for the wire with the phenomenon of peeling, pitting, heavy skin, etc. on the surface, it needs to be ground by a polishing machine before drawing;
(2) Heat treatment: For the wire with excessive hardness or uneven hardness, the hardness should be reduced by annealing or tempering first, and the wire should maintain good hardness uniformity before drawing. For the treated wire, it is beneficial to better ensure the service life of the wire drawing die and the high smoothness and high quality of the wire surface.
