Vacuum Casting (VC) is one of Rapid Tooling (RT) technologies. With ability of new products development being strengthen, VC products has been used widely and quality requirements of VC products are higher, so the quality control is imperative. At present, VC technology has some problems which hinder it to develop, such as the quality of VC products depends on the experience of operators, VC process researches are still in the theoretical study phase, and VC equipments are low automatization, poor flexibili...