METHOD FOR PRODUCING LONG-LENGTH ULTRA-FINE GRAIN SEMI-FINISHED PRODUCTS

摘要

The invention is used for forming the structure of ultra-fine grain semi-finished products and for increasing the complex of mechanical properties of long-length metal materials, in which the length-diameter ratio is greater than 100, by means of deformation processing. The method consists in carrying out offset drawing which involves metal deformation by applying a drawing force through two tandem conical dies and simultaneously rotating one of the dies. The invention makes it possible to carry out a deformation process associated with the modification of the physico-mechanical properties of a metal at a low production cost owing to the fact that the die rotation produces additional shear deformation by means of the eccentricity which is formed by the conical channel of the dies and is defined in relation to the axis of rotation.