Explanation

The metal plastic forming method of making long strip material by pulling the blank of metal or alloy through various shaped die holes to reduce its cross-sectional area. The drawing method can produce tube, wire bar, wire and profiled bar, etc. Generally, rolled, extruded, or forged materials are used as processing blanks. Usually, cold drawing is used. During cold drawing, the drawing pressure should be slightly less than the yield strength of the metal blank at the outlet of the die hole to prevent necking or fracture. Due to work hardening, the strength and hardness of the cold drawn material will be significantly increased with the decrease of plasticity and toughness. In order to continue the cold drawing deformation, bating annealing is often required between cold drawing passes.

Classification