Theoretical and experimental analysis of stress and temperature distributions during the process of rolling bimetallic rods

In this study, the authors present the results of their theoretical and experimental analysis of the rolling process of bimetallic bars in stretching passes. For the experimental analysis, a bimetallic bar was manufactured using an explosive technique method. A numerical model for hot stretching passes rolling was proposed. The model simulated metal flow during rolling of bimetallic bars in edge oval–oval series. The original bars were round (21.7 mm diameter) steel rods, covered with 0.85 and 1.8 mm thick copper layer. The finished products were bimetallic bars, 14 mm in diameter. The rolling was performed in a laboratory mill with 320 mm diameter rolls, which rotated at the speed of 30 rpm. The bars were heated in an electric chamber furnace to the temperature of 960 °C. The results of the experiments were compared with the finite-element calculations of stress and temperature distributions of copper–steel rods in the deformation zone.