Numerical Simulation And Defection Infection Of Rod Hot Rolling Process

Rolling is one of main modes of metal forming in steel production, which is a very complicated process of metal plastic forming. It is difficult to analyze this hot rolling process and take more time and more cost by traditional analyzing tool. However, with the development of computer numerical simulation technique, it has been widely applied to simulate rolling process, which greatly improves efficiency and cuts down expenses.Aiming at the surface wrinkles difficult to eliminate of the piece in the production process of the factory concerned, practical scheme has been worked out through computer numerical simulation. Here is the practical research course as follows.Firstly, the first pass of rolling is as primary object of the research, while the production model is made by using FEM software DEFORM and rigid plastic FEM.Then the actual parameters of the production line are applied to the model, and the data of velocity of the metal flowing, of the stress and the strain are got by numerical value operation. In order to ensure reliability of the simulation result, the simulation data of dimensions, velocity and Z load must tally with the actual data of production.Thirdly, according to the identification theory of defection in metal plastic forming, and the data of the parameters of numerical simulation, the prediction about surface defection of the piece after rolling can become true. The data of post processor shows that, when the piece contacts the roll, the metal flow speed on piece side and the grads of strain rate all have great changes, and it is just the upping phenomenon that makes the surface defection appear.In conclusion, in order to eliminate such defection, there has been provided four projects optimizing: changing rolling speed, adding the rolling angel, reducing the coefficient between rolling and piece, and enlarging the rolling dimension. Further, by numerical simulating and analyzing among the projects by using the FEM model, the fourth is considered as the best project which provides theory ground for practical production.