On the basis of developing and perfecting the conventional process, the new process method is developed to further improve the casting quality, improve the production efficiency and enlarge the application scope of the investment casting. In the 6th issue of "casting" in 1978, it reported that the Beijing oil pump oil tsui plant adopted caged combination large module technology. The member of cage type ensures sufficient rigidity of the module, and can be used as pouring system, and the utilization rate of steel is increased by 10%. Hebei institute of technology etc. By controlling the casting, the runner and gate bar coagulation time, make M M or less within a M or less, and the solidification ended in between the runner and gate stick, gate stick in the liquid metal pour down cylinder, gate investment casting is realized. 1982 "casting" report of tsinghua university, vacuum suction casting filling, control the coagulation time, sprue, solidification, SPR unset, remove vacuum, liquid alloy return within the SPR melting pot. This process has strong filling performance, thin wall castings and high steel water utilization. The heat transfer coefficient and solidification time of the suction casting are determined. In the 3rd issue of "casting" in 1984, ye wrote about the process of electrophoresis. Dip coating conductive coating on wax module, add a small amount of electrophoretic suspension chain phosphate as electrolyte in order to make the surface of the refractory cation adsorption, under the action of electric field, electrophoresis, refractory product to appearance on the surface, and electroosmosis occur, form shell of a certain intensity. The electrophoresis process is short and the production cycle is short. "Casting" 1984 reported a northwestern university USES half water gypsum, plus quartz powder, quartz glass, clay refractory filler plaster mold casting process, production of large, complex study of aluminum alloy castings. Semi-hydrated gypsum is adopted in 621, and the coal bit stone is used as refractory filler, reducing the shrinkage of gypsum shell and cracking. Titanium and its alloys are important aerospace and petrochemical materials. In the late 1970s, titanium alloy castings were produced by melting mold, and our country is one of the top five casting titanium alloy producers in the world. "Casting" published in 1979, no. 2 in Shanghai iron and steel research institute under the high temperature vacuum pyrolysis using propane, corundum (hydrolyzed ethyl silicate shell surface gas phase precipitation graphite, for titanium alloy investment casting production process. Beihang university institute of materials using phenolic resin as binder, graphite powder (sand) for refractory production type graphite shell, roasting in vacuum resistance furnace, carbonized resin binder, obtained has good strength and permeability of the shell, the production of titanium alloy high speed turbo blade. Shenyang institute of foundry "casting" published an article 3, 1986, introduced the ZTS - 1 resin with toner with paint, p-toluene sulfonic acid as a curing agent, the coated sand and graphite sand, ethanol, shell, shell by vacuum and high temperature roasting process in the production of titanium alloy castings. In the 7th issue of "casting", published in 1987, li bangsheng's article was made of zirconia ceramic powder, zirconium sol as binder, preparation of coating, preparation of shell, and research of titanium alloy melting mold casting production.