Papers by Author: Jun Hong Li

Abstract: The stretch reducing process is the last hot deformation process of the hot-rolled seamless steel tube’s production. Its role is to decrease the tube’s diameter under the large tension and expand the range of product specifications. But the stretch reducing process often results in wall thickness tolerance at the head and end of the tube. In order to solve the problem, a 3D elastic-plastic finite element analysis model was established to simulate the stretch reducing process of φ159 unit. Based on this, the tube’s wall thickness distribution was studied and the parameters of sharpen rolling process was put forward. Numerical simulation results indicate that with the parameters of sharpen rolling process, the length of wall thickness tolerance was shorten and the rate of finished products was proved.

Abstract: The cold rolled strip undergoes great transforming of micro-organization and change in properties in continuous annealing furnace. At the same time, it is acted upon by all kinds of forces, such as tensile and compressive stresses, bending stress, thermal stress. and thus it would affect stability of the steel strip. The finite element model of steel strip and guide rollers are established, and the ANSYS software is used to study the effects on transverse stress distribution under different strip shapes that contains center buckle, double edge wave, compound buckle, quarter buckle and quality shape. Profile of guide rollers such as different crowns and straight lengths are also be researched which is intended to provide a reliable base in theory for getting reasonable profile of guide rollers and homogenizing the tensile stress to improve shape quality.