FEM Analysis of Deformation-Induced Heating for Auto-Steel in Stamping Production

摘要

It is a well-known phenomenon in auto-steel stamping industries that the temperature of forming dies grows when the stamping frequency is increased. In some cases, this temperature can go up enough to influence the drawing performance of blanks, leading to a large, unacceptable rejection rate. Focus on this problem, this article gives studies on the relationship between forming dies temperature and stamping frequency, based on experiments and FEM analysis. Basically, numerical and physical experiments are employed to analyze the uniaxial tensile tests of IF steel sheet to get the temperature increment tendency versus the stretching rate. After comparing the results from physical experiments and FEM simulations, some important numerical issues are verified valid enough, such as the thermo-mechanical coupled model, simulation parameters, especially the real punch speed used in FEM. Furthermore, this article gives the functions of the temperature, of blanks and dies, and the stroke time under the various stamping frequencies, by a number of simulations on cup drawing processes. All the results show in this article that thermo-mechanical FEA is very useful to analyze and forecast temperature variation of tools and blank in practical stamping process.