DEVELOPMENT OF THE TECHNOLOGICAL PROCESS OF ROLLING BARS IN THE NEW DESIGN RADIAL SHEAR MILL BY USING PHYSICAL MODELING

A new design radial shear mill (RSM) which allows us obtaining high quality rods and wires by combining rolling and pressing is presented in this article. Physical modeling of the technological process of rolling rods and wires at RSM with various processing modes was performed by using STD 812 torsion plastometer. The change in the structure of aluminum alloy A5083 during multi-stage compression at various temperatures and strain rates is described with a single position. The impact of temperature-deformation processing conditions on the microstructure and micro-hardness of aluminum alloy A5083 while rolling at RSM is analyzed. Kinetics of growth and grain grinding are considered; the conditions for forming the fine-grained structure are mentioned. It is established that in the deformation temperature range of 200 ÷ 300 °C and strain rates of 1.0 and 30 s-1, dynamic and static recrystallization proceeds in the structure of the aluminum alloy A5083, depending on the temperature-deformation processing conditions. In the article, it is proved that it is necessary to perform rolling of the workpieces on a RSM at a rolling temperature of 280-320 °C in order to ensure a fine-grained structure in bars out of A5083 alloy.