Simulation modeling of stressed-deformed mode of band at rolling in a multi-functional longitudinal-wedge mill

Abstract

The paper presents results of investigation of stress-deformed state (SDS) of a metal block at rolling in longitudinal-wedge mill (LWM).The quantitative data obtained by the finite elements method and the MSC Super Forge program, and the main regularities in the distribution of SDS and the temperature at blanks rolling in a longitudinal-wedge mill with various unitary crimps were established. To determine the ultimate plasticity, the samples were tested on an STD 812 plastometer. This plastometer allows testing specimens by torsion, stretching and compression at temperatures up to 1500 ° C. The test is performed with continuous or fractional crimp with a given degree and strain rate at each passing. The plastometer is equipped with a control unit and a computer program that allow automatic output of the resistance curves of deformation of metals and alloys. It is established that the steel 08kp is characterized by a sufficiently high level of ultimate plasticity and has a wide range of satisfactory deformability. It is found an increase of the value of the ultimate plasticity at the examined deformation rates with increasing test temperature, and the rolling of strips of the steel 08kp in the longitudinal-wedge mill is carried out without disrupting the continuity of the billet material. It is shown that rolling in multifunctional LWM leads to the localization of stress intensity and deformation in the initial stage of rolling in the zones of capture of the workpiece by a roller. At subsequent stages, the sections concentrating the intensity of stresses and deformations gradually transferred from the central layers to the surface zones and edges of the workpiece. Gradual transfer of intensity of stresses and deformation from the center to the edges and the surface of the workpiece makes it possible, by selecting rational deformation modes of rolling, to obtain high-quality bands with a fine-grained structure.