凸曲面拼接模具铣削过程三维有限元仿真研究

FEM Simulation Research on Convex Surface Splicing Mold Milling Process

覆盖件模具具有形状复杂、材料硬度高和多硬度拼接等特点,在加工过程中易出现刀具载荷不稳定、温度过高和易发生剧烈磨损等问题,从而降低模具的表面质量和刀具的使用寿命。为揭示铣削机理,建立了凸曲面拼接模具铣削过程三维有限元仿真模型,采用三维有限元仿真的方法来对凸曲面拼接模具铣削过程进行研究。首先通过准静态试验、霍普金森压杆试验拟合出材料的本构参数,以此保证仿真结果的准确性;然后建立凸曲面拼接模具铣削过程三维热力耦合仿真模型;最后通过仿真结果研究了凸曲面拼接模具铣削过程力和温度的变化特性。研究结果为航空航天产品的模具铣削技术及刀具结构设计提供理论支持。

Panel mold has the characteristics of complex shape, high hardness and multi hardness stitching. In the process of machining, the tool load is unstable, the tool temperature is too high and the cutting tool is easily worn out. Thus the surface quality of the die and the service life of the tool are reduced. In order to reveal the milling mechanism, a threedimensional fnite element simulation model for the milling process of convex surface splicing dies was established and the 3D fnite element simulation method is used to study the milling process of the convex surface splicing die. First, the constitutive parameters of the material are ftted by the quasi static test and the Hopkinson pressure bar test to ensure the accuracy of the simulation results. Secondly, a three-dimensional thermal coupling simulation model of the convex surface splicing die milling process is established. Finally, the changing characteristics of force and temperature during the milling process of the convex surface splicing die are studied through simulation results. The research results provide theoretical support for mold of aerospace products milling technology and tool structure design.