СПОСОБ ПРОШИВКИ СЛИТКОВ БОЛЬШОГО ДИАМЕТРА ИЗ ХЛАДОСТОЙКИХ МАРОК СТАЛИ

摘要

FIELD: processes for piercing large-diameter ingots in screw rolling mills, possibly manufacture of tubes in tube rolling aggregates with pilger mills. ^ SUBSTANCE: method for piercing ingots of large diameters of cold resistant kind of steels comprises steps of deforming solid part of ingot till nose of mandrel; deforming ingot onto mandrel and deforming it at rolling around sleeve. Deformation of ingot characterized by relation 3.1 <= L/D <= 3.6 in front of mandrel nose lowers linearly from bottom portion of ingot to its head from reduction degree 10% till 6% where L - ingot height, mm; D - diameter of bottom part of ingot, mm. ^ EFFECT: lowered inner scabs and spills at piercing large diameter ingots.