The investment casting process simply involves using a fusible material (such as wax or plastic) to create a fusible model (called an investment model or model) and coat it with a few special fire-resistant coatings. After the monolithic shell, melt the model from the shell using steam or hot water, put the shell in a sandbox, put dry sand around it, and finally put the mold in a firing furnace for high temperature firing (high If a strong mold shell is used, the mold shell can be fired directly without using a model shell.) After firing the mold or shell, the molten metal is poured to make a casting.
The dimensional accuracy of investment casting is high and can generally reach CT4-6 (CT10-13 for sand casting, CT5-7 for die casting). Of course, due to the complex process of investment casting, there are many factors that affect the dimensional accuracy of the casting. Shrinkage of material, deformation of investment mold, linear change of mold shell during heating / cooling, shrinkage of alloy, deformation of casting during solidification, etc. The dimensional accuracy of regular investment castings is high, but consistency needs to be improved (it greatly improves the size consistency of castings using medium and high temperature wax materials).
When pressing the investment mold, the profile of the cavity surface finish is high, so the investment mold surface finish is relatively high. The shell is made of a special heat-resistant adhesive suspended from an investment mold and a refractory paint made of a refractory, and the inside of the cavity that comes in direct contact with the molten metal has excellent smoothness. As a result, the surface finish of investment castings is higher than common castings and can generally reach Ra. 1.6-3.2μm.

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