The shape and structure of the cast of different layers of shell, there will be differences. For example, with elongatedslot casting Kong Huo need to do two or three times the surface layer; the general casting two times to do the backing layer is enough, and the relatively large castingsmay require three or more layers. Cost of shell castings per kilogram is about 5.9 yuan, of which the material costs accounted for 67.8%, fuel and poweraccounted for 23.9%,accounted for 13.3% of wages. In the 4 yuan / kg of shellmaterial, zircon sand andzirconium powder consumptionaccounted for 63%, accounted for the entire cost of shell42.7%, silica sol costs accounted for about 12.2% of the cost of making shell. Although the zircon zirconium powderwas used for the surface layer.
