WIRE ROD ROLLING METHOD Russian patent published in 2000 - IPC

FIELD: rolled stock production, namely rolling wire rod in small bar rolling mills. SUBSTANCE: method comprises steps of cooling mean portion of rolled piece; beginning cooling process in time moment when length of leading non-cooled end of rolled piece achieves value α_n.-c.= α_r.m./μ_t, where α_n.-c. - length of non-cooled end of rolled piece (m), α_r.m.- total elongation value after cooling process beginning; completing cooling process after achieving length of cooled portion of rolled piece equal to μ_t, where α_c= [1-2•(α_n.-c./l_b•μ_t.l.)]•l_b•μ_t.l.- length of mean cooled portion of rolled piece(m), α_c - length of blank(m), l_b - length of rolling mill(m), μ_t.l. - total elongation value before cooling process beginning. Cooling degree is determined according to expression ΔT = K•ΔB, where ΔT- cooling degree (C), B- desirable additional widening of mean portion of rolled piece(mm), K- factor taking into account steel kind and determined according to next expression K= 84 x lnσ_y - 369, where σ_y - reference yield strength. EFFECT: possibility of making rods with geometry stable along their whole length, reduced number of rejected rods. 1 ex