In view of the difficulties in the application of complex wide-spreading model in the reverse pass design of section steel rolling,by using Newton iteration method,the nonlinear equations are quickly approximated by tangential equations,and the nonlinear equations are solved in the reverse pass design of universal pass rolling for heavy rail.Reverse pass design and valida-tion of universal pass rolling for heavy rail combined Smirnov's wide-spreading model and Eklunds wide-spreading model was car-ried out combined with high-level computer language programming using Newton iteration method.The results show that this method can meet the requirements of engineering applications.Under the premise of constructing a system of nonlinear equations containing the equation describing the shape of the previous pass and the equation of the wide-spreading model,this method is ap-plicable to the reverse pass design of other types of section steel with complex cross section.
Newton iteration methodheavy railuniversal pass rollingwide-spreading modelpass design
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