关键词: 汽车覆盖件模具；高速切削；有限元模型； 钼铬合金铸铁

Abstract:

To study high-speed machining process of auto panel dies, a finite element model (FEM) was built. Under conditions of high-speed cutting, high strain rate, high temperature and high strain were happened in the work piece material. High-speed compress experiments were done to achieve material mechanical properties. Other key technologies such as the interface friction model and the heat conduction equation between tool rake face and chip flow were studied. High-speed milling experiments were completed and cutting forces result from FEM and experiments were compared. The distribution of machining temperature and stress was studied, and the chip shaping process was analyzed. It is shown that the finite element model can reflect the real process of high speed machining auto panel dies and the model can be used to select optimal machining parameters and tools.

Key words: auto panel die, high-speed cutting, finite element model, MTMoCr