Computer Modeling and Investigation of the Rolling Process of Thick Strips in Relief Rolls Under Conditions of Kinematic Asymmetric Interaction

Abstract

This work, carried out within the framework of grant project № AP19678682, funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan, presents the results of finite element modeling in the Simufact Forming program of the rolling process of thick strips in relief rolls under conditions of kinematic asymmetry. A 10 mm thick blank made of CuZn39Pb2 brass alloy was used for the simulation. For kinematic asymmetric rolling, the speed of the first roll was 90 RPM, and for the second roll it was 60 RPM (asymmetric coefficient was 1.5). For comparison, the results of symmetric rolling were also considered. When analyzing the strain state, it was revealed that the maximum value of equivalent strain in asymmetric rolling is 13.7% higher than in symmetrical rolling. Also, with asymmetric rolling, a deeper processing of the workpiece is observed. When analyzing the stress state, it was found that during asymmetric rolling, the stresses at the point of contact between the fast roll and the workpiece exceed the stresses at the same point of contact with the slow roll by 12%. There is also a more uniform stress distribution over the thickness of the workpiece compared to symmetrical rolling. An analysis of the force values on the rolls showed that when using asymmetric rolling, the force is 5.4% lower compared to the same symmetrical rolling (456 kN versus 432 kN). With asymmetric rolling, the material flow rate is higher in the deformation zone caused by the higher rotation speed of one of the rolls. The direction of material flow, compared with symmetrical rolling, is deviated towards a fast roll. At the points of contact of the workpiece with the rolls, the flow rate is 15.5% higher near the fast roll, compared with the slow roll.