The working area is the area where the wire is plastically deformed. Its size parameters include the working area cone angle a and the working cone length h2. Working drawing die for drawing die cone angle is a parameter, the size of the working area the size of a cone angle of the bore acting on the drawing die and the pressure

　　The distribution law, the size of the drawing stress and the mechanical properties of the drawn wire play a decisive role.

　　The cone angle of the working area corresponding to the lowest drawing stress varies with the drawing environment, and there is an optimal working area cone angle range. When drawing

　　It is difficult to ensure that the axis of the wire rod is concentric with the axis of the inner hole of the wire drawing die. In addition, the diameter of the wire entering the inner hole increases due to the excessive wear of the inner hole of the wire drawing die during the previous drawing. Both will cause the wire to deform outside the deformation zone, so work The length of the zone should be greater than the length of the actual deformation zone.