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Investment casting is uses melt materials such as wax or die material, then adds several layers of special refractory coating to the mold. After drying and hardening, it is formed a module, then from the module melts loss of investment casting to obtain a hollow shell. Next, the shell is placed into a roasting furnace after high temperature calcination. Finally, the shell is poured with the molten metal.
Because wax is typically used to make the mold, the method is also called lost-wax casting or investment casting. Compared with sand casting, the investment casting method has higher precision and lower surface roughness, which can be finished with little-to-no cutting. Therefore, usually "precision investment casting" is referred as "precision casting", "investment casting" or "casting".
