線材・棒鋼圧延の幅広がり特性とその数式化(<特集>圧延歩留り向上の技術と理論)

概要

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In order to develop a simple general formula for calculating the spread in rod rolling, the hot rolling of steel by square-oval, round-oval, square-diamond, and diamond-diamond passes has experimentally been studied. The profile of stress-free side surface of rolled rods and the various geometrical factors related with spread ratio have been investigated. The profile of stress-free side surface differs for the four types of passes ; in the square-oval pass, it is assumed to be a straight line ; in the round-oval pass, two circular arcs with a radius larger than that of initial rods ; in the square-diamond pass, the angle of side surface is similar before and after rolling ; in the diamond-diamond pass, its angle after rolling is slightly smaller than before rolling. The calculated and measured values of the maximum projected width of contact are compared and a close agreement is obtained between them. For all of these four passes, the spread ratio can be expressed by a single formula as follows : Spread ratio=(B_1-B_0)/(B_0)=α(Ld_m)/(B_0+0.5・H_0)・(F_H)/(F_0) where B_0, B_1 : Width of material before and after rolling H_0 : Height of material before rolling Ld_m : Mean projected arc of contact F_H/F_0 : Fractional reduction of area before rolling α : Coefficient (=0.83). This is a general, simple and sufficient accurate formula.
社団法人日本鉄鋼協会の論文
1981-11-01