Comparison of hole shapes of wire drawing dies at home and abroad

　　The domestic wire drawing die blanks have the following obvious shortcomings:

　　①The entrance angle is small. Since the wire first contacts the die core entrance area during the drawing process, the taper angle of the entrance area is small, which not only increases the contact area between the wire and the inner hole, increases the friction force, but also prevents the introduction of lubricant, which makes the drawing process The lubrication effect in the medium becomes worse, which seriously affects the service life of the mold. The entrance angle of foreign wire drawing die products is increased, which effectively avoids the scratches between the wire and the wire drawing die, and brings in more lubricant, which enhances the lubrication effect and reduces the wear of the die core. This change improves the surface quality of the wire and also improves the service life of the wire drawing die.