Spread Characteristics and Spread Formula in Steel Bar Rolling

Abstract

This paper describes the spread phenomena and geometrical models in Oval-Square, Oval-Round, Diamond-Square, Diamond-Diamond and Oval-Oval passes. The experiments have been conducted by caliber rolling of hot steel bars. The profile of stress-free surface differs for the five types of passes; in the Oval-Square, Oval-Oval and Oval-Round passes, it is approximated by circular arcs with the same radius of initial bars; in the Diamond-Diamond and Diamond-Square passes, its angle after rolling is slightly smaller than before rolling. A spread formula proposed by the authors previously has been proven to be fundamentally available to all of these five passes.