A, vacuum suction casting:Lost wax casting put vacuum pouring box, shell by shell in the tiny pore suck gas in the cavity, can make the liquid metal mold filling better, copy the shape of the cavity, improve casting accuracy, prevent the pores, the defects of misrun.The method has been applied to abroad.Second, the crystallization under pressure:Lost wax casting pouring shell on the pressure inside the tank, the end of the immediately closed pressure tank, the tank ventilation with high pressure air or inert gas, make the casting solidification under pressure, in order to increase the density of castings.The maximum pressure in a foreign country has reached 150 ATM.Three, directional crystallization (RDS) :Some such as turbine blades, such as magnetic steel investment castings, if their crystal structure is arranged in a certain direction of the columnar crystal, lost wax casting performance can improve a lot, so the precision casting directional crystallization technology is rapidly developed.