Problems in vacuum sealed molding casting Al-Si alloy were described based on characteristics of the vacuum sealed molding and cast Al-Si alloy properties

including Al-Si alloy easier to oxidation and inspiration

high difference value of hydrogen solubility in between liquid aluminum and castings

slow heat radiation of vacuum sealed molding and high solidification contraction of Al-Si alloy.It is adopted to successfully produce Al-Si alloy high voltage switch by keeping the raw material properly to make a good preparation before melting and rapidly melting to decrease pouring temperature and time and raising cooling velocity and exhaust degree in cavity

fully refining as well as adopting tilting pouring.