Кинематика кручения полосы при прокатке в многовалковых калибрах конических валков

Abstract

Rolling of sticks and pipes in multirolled calibers is very perspective owing to the profitable state of stress scheme and possibility of large stretches obtaining. While slight widening large stretches contribute to longitudinal texture creation in sticks and pipes, which are succeeded to recrystallization texture after hot deformation. Texture of metalwares, made of complex alloyed steel and alloys, creates mechanical anisotropy. Substitution of longitudinal sharp-texture for screw texture enhances impact resistance and long-term strength of sticks and pipes made of refractory steel and alloys. The present article describes and analyses means of torsion and numerically estimate torsion size of stripes, rolled in 4-rolls calibers of tapered rolls. This new rolling method in section and reducing mills allows to create screw texture and enhance strength characteristics of sticks and pipes in tangential direction and totally dispose split of metalwares at heat treatment. Owing to 4-rolls calibers of tapered rolls, rolling according to circle-circle system is realized without overfill at relatively large reduction. At pipe rolling in round calibers without eccentricity nonuniform pipe wall thickness reduced without fixture is totally removed.