EFFECT OF DRAWING ANGLE SIZE OF A DIE ON WIRE DRAWING AND BUNCHING PROCESS

This paper focuses on the effect of drawing angle size of a die on the wire processing into a ropery at the bunching of steel cords. Experiments were carried out with usage of standard dies with drawing angle size 2 alpha = 11 degrees and 2 alpha = 13 degrees. Results of the experiments were statistically evaluated and they proved that dies with 2 alpha = 11 degrees had beneficial effect. Drawn wires on dies with 2 alpha = 11 degrees were with lower level of hardening and so the drawing process was better. This beneficial effect of 2 alpha decrease was also demonstrated by the reduction of wire fractures and lower wire scrap quantity during steel cords bunching.