低压铸造成败的关键之一是加压速度的选择和控制。从工业应用的角度来看,对控制装置有以下基本要求。1．再现性好实际生产中,每一工作班次坩埚的密封程度不可能完全一致;每浇注一个零件后,坩埚中的空间容积都有所增大。因此,控制装置必须能自动地对容积变化和漏气进行补偿,才能确保每个零件都能获得同样的充型速度,即所谓“良好的再现性”。 One of the keys to the success or failure of low-pressure casting is the choice and control of the rate of pressurization. From the industrial application point of view, the control device has the following basic requirements. 1. Reproducibility In actual production, the crucible sealing capacity of each shift can not be exactly the same; after pouring a part, the space volume in the crucible has been increased. Therefore, the control device must be able to automatically compensate for volume changes and leaks to ensure that each part can achieve the same filling speed, the so-called “good reproducibility.”