The simulation study of the linear mark generating process in the stretch reducing

It is well recognized that the linear mark is one of the quality defects on the tube surface in the stretch reducing process. However, among previous literatures, the problems of the non-homogeneous wall thickness and the internal polygonization have been given more attention, while the research on the linear mark generating in the stretch reducing is ignored to a certain extent. In this paper, the simulation study was carried out for the rolling process when the pass is over full through the thermo-mechanical coupling FEM. The problem of the mesh distortion in the small roll gap was solved by means of applying local dense meshes and Euler method. The distribution of deformation and temperature of the tube were then obtained. The reasons of the linear mark generating and the cracks initiating on the tube surface can be found in the obtained results.