注塑模充填过程三维热-结构耦合仿真分析

3D Thermal-Structural Coupled FEM Simulation in Filling Stage of Injection Mold

采用有限元法对洗手液瓶注塑模充填过程瞬态温度场和热应力场进行了研究,通过建立三维瞬态温度场以及热应力场的数值模型,运用ANSYS软件对注塑模进行了温度场分析,获得了注塑模在充填过程中温度场分布规律。并在温度场的基础上,采用热-结构耦合分析方法,得到了注塑模内部重要零件的热应力分布和变形情况。结果表明,注塑模在充填过程中温度场呈不均匀分布,型芯和滑块等零件产生了较大的热应力,极大程度地削弱了结构的强度。减小由于温度场分布不均而引起的热变形干涉,降低模具内部热应力,可延长模具使用寿命,为合理设计注塑模冷却系统提供了理论指导。

The transient temperature field and thermal stress field in the stage of filling the injection mold are studied by the finite element method. The numerical analysis model about three-dimensional structure for injection mold of transient temperature field and thermal stress field is established,and then the distribution of temperature field is simulated by ANSYS.Based on the temperature field,the thermal stress distribution and deformation condition are obtained by the thermal-structural coupling method. The results show that the temperature field in the filling process of injection mold is uneven distribution,which produces larger thermal stress in the core and slider parts. That drastically weakens the strength of the structure. It can prolong the service life of mold by reducing the thermal deformation interference and internal thermal stress,which provides the theoretical instruction for the optimization of injection mold cooling system.