Numerical Simulation Of Plate Of Temperature And Stress Field For Plate Roller

In plate heat treating production line，the key equipment is rollerquenching machine. Plate quenching on roller is the main technologicalmean to produce the plate of high strength. However, plate quenching onroller have high cooling rate, there is drastic temperature variety and thedifference in temperature in thickness direction, and the cooling rates inthickness direction are also different. These may easily induce largerthermal stress and organization stress, eventually, which lead to platewarping deformation and high scrap rate. Facing these problems, thereasonable quenching process must be work out for plate quenching onroller. Studying temperature field and thermal stress field of plate inquench cooling based on the Finite Element Numerical method can providetheoretical basis for the optimization of the plate quenching on rollerquenching machine.In this paper, Q690D is analyzed as subject investigated. Throughstudying local heat transfer characteristics of the quenching water and heattransfer control equation, plate cooling progress is sampled in order tobuild right model of FEM of plate quenching on thickness-section of steel plate. The temperature distribution and cooling rate of different point alongthe direction of thickness of50mm heavy plate is simulated byANSYS11.0. At the same time, the simulated model is proved. On the baseof model proving, the thermal stress field of50mm heavy plate is simulatedusing indirect coupling method. The effects of heat transfer coefficient,quenching modes and roller speed on the temperature field and thermalstress field of heavy plate with different specifications during quenching onroller are analyzed.The results showed that the heat transfer coefficient increases within acertain range, the cooling rate of heart of steel is improved. It is found thatwith the continuous quenching cooling, the plate can be cooled uniformlyand its internal thermal stress is reduced. With the roller speed increasing,the internal thermal stress is reduced. However, the cooling rate of center ofplate is also decreased, thus the right roller speed must be chosen in orderto produce suitable products.