真空压铸中型腔真空压力的理论计算及试验研究

针对真空压铸中型腔真空压力的下降规律进行了理论计算和试验研究。针对具体的真空系统进行了型腔排气理论曲线和实测曲线的对比,验证了这种计算方法的可行性,指出了真空压铸为了达到理想的型腔真空压力对于低速工艺选择的限制要求,并提出了一种通过计算理论排气时间来对真空系统设计和低速工艺制定进行优化的方法。

Calculation and Experiment on Cavity Vacuum Pressure in Vacuum Die Casting Process

In vacuum die casting process, the characteristic of cavity vacuum pressure curve was studied by theoretical calculation and experimental measurement by installing a vacuum pressure sensor inside an experimental die. The calculation was proved coincident with the experimental results. The cavity vacuum pressures of different slow injection processes were investigated. An important parameter, the vacuum time, was indicated to have obvious influence on the quality of vacuum die castings. Based on the calculation of cavity vacuum pressure, a method was proposed to help adjusting the vacuum system and to optimize the slow injection phase in a vacuum die casting process to keep the cavity vacuum pressure on an appropriate level.