论文部分内容阅读
采用直接差分法求解热传导方程,对L形镁合金铸造过程进行模拟,研究了铸型尺寸对温度场的影响。结果表明:在镁合金铸造过程中,热量通过铸件/空气和铸件/铸型界面向外部环境、铸型传递,铸件直边区域形成热扩散层“阶梯”温度降低,铸型内部形成温度扩散层其温度升高。在底座高度小于直边宽度时,铸件直边和底座区域温度均下降迅速,铸件从直边和底座区域向拐角区域凝固;随着底座高度和直边宽度的增加,铸件底座和直边区域的面积增加,降低相同温度所释放的热量增加,铸件拐角中心和铸型中心单元的温度均升高,铸件从直边区域向底座区域凝固,凝固时间增加。
The direct difference method is used to solve the heat conduction equation, and the casting process of L-shaped magnesium alloy is simulated. The effect of mold size on temperature field is studied. The results show that in the process of magnesium alloy casting, the heat is transferred to the external environment and the mold through the interface of casting / air and casting / mold, the thermal diffusion layer is formed at the straight edge of the casting and the temperature of the “ladder” Diffusion layer its temperature rise. When the height of the base is less than the width of the straight edge, the temperature of the straight edge and base area of the casting drop rapidly. The casting solidifies from the straight edge and the base area to the corner area. With the increase of base height and straight edge width, The area increases and the heat released at the same temperature decreases. The temperature at the center of the casting corner and the center of the mold increases. The casting solidifies from the straight edge area to the base area and the solidification time increases.