Study On The Influence Of Geometric Parameters And Shear Speed ​​on Shear Process

The metal plate shearing is one of the most important processes in sheet metal forming and material processing. Shearing and fracture of the metal is a very complicate process, its deformation is focused on the small area which is around the cutting edge. The rolling shear of metal plate is a comprehensive problem involving multi-disciplinary, it involves many fields such as theoretical mechanics, elastic-plasticity mechanics, materials science, mechanical vibration, fracture and damage mechanics and so on. Large numbers of factors influence the fracture of metal plate shearing, such as the deformation of plate, material properties(including microstructure, surface conditions and homogeneity, etc.) and the parameters on shear(the upper blade geometric parameters, shear velocity, shear temperature, coefficient of friction, etc.). In the process of fracture of the metal plate rolling shear, it often led to low qualified cross section, low efficiency, worn upper blade, which is due to unreasonable choice of shear velocity. It brings a lot of troubles in the actual steel plate production process. Therefore, it is a critical importance for the research on the influence of the adjustment of geometric parameters and shear velocity on the stress distribution, the cross section quality and the shear force.This paper is based on the project of Shanxi Scholarship Council. Aiming at the present problems such as low qualified cross section, low efficiency, worn upper blade, which happened in the process of rolling shearing common used metal plate. Through the theoretical analysis on the principle of rolling shear and shearing parameters, the upper blade geometric parameter is optimized, and a high-speed rolling shearing method with the best upper blade geometric parameters is presented. From perspective of theoretical mechanics analysis, the theoretical calculation formula of the shear force is deduced in different stage. The shearing process of rolling shear is simulated by FEA software DEFORM-3D. It analyzed the influence of the upper blade geometric parameters and shear velocity on the equivalent stress distribution, the shear force changing rules and the cross section quality. Finally, the theoretical analysis and numerical simulation guidance a shear test of high-speed rolling shear with the upper blade geometric parameters, it has provided a theoretical foundation to have a reasonable choice of major shear parameters for upper blade geometric parameters and shear velocity.