Numerical Simulation And Research Of Plate In The Process Of Roller Quenching

Based on 3500mm plate roller quenching machine project of Nanjing & Steel Co. Ltd., the heat transfer mechanism of quenching, and the experiment of measuring plate center cooling curves, the article studied the convective heat transfer boundary condition of steel plates subjected to impingement jets. The three-dimensional temperature field as well as stress and deformation condition during the process have been numerical simulated and experimentally investigated by using the ANSYS. This dissertation consists of parts as follows:(1) Designing rational experimental plan, the measuring 50mm Q690 plate center cooling curves experiment (black box) was conducted. The heat transfer coefficient was confirmed by comparing the actual cooling curves and the simulation cooling curves.(2) The mechanism of effective, uniform and continuous roller quenching process was analyzed. By the numerical simulation method of finite element, the three dimensional temperature field has been numerical simulated. The changing law of temperature field for quenched plate has been gotten. The temperature distribution along surface, thickness, width and length was analyzed.(3) According to thermal elasto-plastic mathematical model, the indirect coupling method of thermal stress has been adopted to study the thermal stress and s train field for plate's roller quenching process, the changing law of the thermal stress and strain field has been found. The maximal thermal stress has been analyzed. The simulation result of deformation shows that thermal stress arrive maximal at time of 20 second in high pressure quenching zone. The surface stress transfer from tensile stress to compressive stress and the center stress transfer from compressive stress to tensile stress.