Wa. Khudheyer et al., A COMPARISON BETWEEN MACROSHEAR REDUNDANCY AND LOADING EFFECTS IN 2-ROLL AND 3-ROLL ROTARY TUBE CONE PIERCERS, Journal of materials processing technology, 65(1-3), 1997, pp. 191-202
Very high levels of redundant macroshear strains generated in the obli
que rotary-piercing processes are detrimental to the quality of the bl
ooms produced. Although the situation is improved when cone-type rolls
are used, the question of the choice of the particular piercing syste
m still remains. In this paper, using lead and internally-marked wax b
illets, an experimental comparison is drawn between the redundant-macr
oshear effects, and also between the force parameters in 2- and 3-roll
tube cone rotary piercers. The optimal rolling conditions are indicat
ed, and the respective advantages and disadvantages of the two systems
are discussed. (C) 1997 Elsevier Science S.A.