Abstract
From the viewpoint that the shape of a wire drawing die has some influence on its abrasion, a research was made to examine the relation between drawing force and the die shape by using two kinds of tungsten carbide dies whose shapes are different and a diamond die. The factors that cause the difference in abrasion of the dies were investigated. The results obtained are as follows:
1) The mean value and the fluctuation of drawing force in the case of tungsten carbide die increase with increasing the length of bearing portion, and the abrasion of the die with longer bearing portion is much larger than that of shorter bearing. The abrasion of the die is represented by the increase in diameter of drawn wire.
2) The ratio of length of bearing portion to diameter of the tungsten carbide die is an index of magnitude of the drawing force, but this value can not be applied to the comparison of the drawing force for tungsten carbide die and that for the diamond die. It is considered that this is due to different surface conditions of both dies.
