The Influence Of Drawing Conditions On The Service Life Of Drawing Dies

Depends on the quality of itself on the one hand, and also on the stretching conditions on the other hand.

(1) The impact of shrinkage rate

In the stretching process, the wire drawing die produces pressure on the metal wire, and the metal wire also produces a back pressure on the wire drawing die wall when it is deformed. The greater the reduction rate used in stretching, the stronger the pressure of the hole wall on the metal wire, and the reaction force of the metal wire on the hole wall will increase accordingly. If this force is greater than the tensile capacity of the mold itself, then The drawing die will crack.

(2) The influence of lubricants

During the stretching process, the quality of the lubricant and the sufficient supply of lubricant affect the service life of the drawing die. Lubricants have lubricating, cooling, cleaning and anti-rust effects during the wire drawing process.

(3) The influence of the surface quality of the metal blank

If there is an oxide layer, sand or other impurities on the surface of the metal blank, it will adversely affect the service life of the drawing die. Because the oxide layer on the metal surface is hard and brittle, when the metal blank passes through the die hole, it will cause the die hole of the drawing die to wear quickly and scratch the surface like an abrasive. Therefore, it must be pickled off before stretching; when stacking the blanks, pay attention to the tidiness of the stacking site and avoid contact with sand and other impurities.