Specifications of the casting precision casting is relatively broad, small to a few millimeters to thousands of mm can casting, precision casting wall thickness now is 0.5 mm, the thinnest minimum aperture below 1 mm.Precision casting can obtain relatively accurate shape and high precision casting.Precision casting process, generally need first to make the blank of the electrodes, and then use specific internal electrode corrosion model, the formation of cavity.With the method of casting wax, casting the original wax models.Brush layers on the wax models on high-temperature liquid sand material.After dry, wait until to be enough thickness.To heat up again, the inside of the melt wax models, obtain and blank cavity.Then the in casting molten iron in the mold and the outer peel off after curing, can get what we need of precision manufacturing.