EFFECT OF DRAWING ANGLE SIZE OF A DIE ON （死在大小效应的角度）.pdfVIP

23. - 25. 5. 2012, Brno, Czech Republic, EU EFFECT OF DRAWING ANGLE SIZE OF A DIE ON WIRE DRAWING AND BUNCHING PROCESS a a b Viktor TITTEL , Miroslav ZELENAY , Ľuboš KUDELAS a STU Faculty of Materials Science and Technology in Trnava, J. Bottu 25, 917 24 Trnava, Slovak Republic, viktor.tittel@stuba.sk, miroslav.zelenay@ b TU Košice, Faculty BERG, Park Komenského 14, 040 01 Košice, Slovak Republic, lubos.kudelas@tuke.sk Abstract 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 2α = 11° and 2 α = 13°. Results of the experiments were statistically evaluated and they proved that dies with 2α = 11° had beneficial effect. Drawn wires on dies with 2α = 11° were with lower level of hardening and so the drawing process was better. This beneficial effect of 2α decrease was also demonstrated by the reduction of wire fractures and lower wire scrap quantity during steel cords bunching. Key words: wire hardening, bunching, die, drawing angle, steel cord 1. INTRODUCTION The basic design solution of die is realized so that by drawn wire it covers the required precision of the dimension and the quality of surface. Unthinkable part of the die construction is its geometry [1, 2]. By steel wire drawing the process of plastic deformation is generated and this is in consequence of the present force effect (Fig. 1) and drawing force. Drawn steel wire and die are heated gradually. Creation of thermal energy is caused in the result of tra