In the process of casting process production, the pouring of nickel hard castings should follow the principle of high temperature and low temperature casting. In order to improve the temperature of molten metal, which is conducive to the complete melting of inclusions and the rise of molten slag, facilitating the removal of slag and degassing, and reducing the slag inclusion and porosity of machine castings, the casting of nickel hard castings should follow the principle of high temperature and low temperature casting.The low pouring temperature can help to reduce the gas solubility, liquid shrinkage and the baking of high temperature metal liquid on the surface of the mold cavity.
On the premise of ensuring that the mold cavity is filled with nickel hard castings is small, low casting temperature should be adopted as far as possible. The operation process of injecting metal liquid from the casting ladle into the mold during use is called casting.In the process of design, in addition to determining the casting geometry and size based on working conditions and metal material properties, the rationality of design must be considered from the Angle of casting alloy and casting process characteristics.
Nickel hard castings need to select suitable parting surface, molding and core-making methods according to their casting weight, size and structure, casting alloy characteristics and production conditions, and reasonably set casting bars, cold iron, risers and pouring systems.To ensure quality castings.http://www.wuxiorient.com/