What is investment casting

Investment casting is also called the precision casting or lost wax casting, it is with fusible materials (wax and plastic, etc.) made precise meltability model, on the model which are coated with several layers of refractory coating, such as gypsum, silica sol, after drying, the hardened into the whole shell, then heating type shell model, then through high temperature roasting and become refractory shell, poured liquid metal into the shell,  The casting will be formed after cooling. Investment casting is a casting process with little or no cutting. It is an excellent technology in the casting industry, and it is widely used.