Abstract

The mechanism of straightening of sections and rails by means of a roller straightener with axial adjustable rolls has not been clarified. The auther studied this problem analytically and derived the relations between the largest radii of bending necessary for straightening, at the points of the second and third rolls of straightener and the results of straightening, when the modulus of elasticity and curvature of sections before operating are known. The auther also shows, as a special case, that the sections can be straightened not only in horizontal plane, but also vertical plane in accordance with severe bending in even horizontal plane by the straightener rolls. The present paper deals with the repeated bending tests and the tension-compression tests for specimens of hard steel, mild steel and brass, as these characteristics of repeated cold works on these materials are the most important points for designing the straightening machine.

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