The first is the design process of the casting. The design, in addition to the casting geometry, to determine the size according to the working conditions and performance of metal material, must also be from casting alloy and casting process characteristics to consider the rationality of the design, namely the obvious size effect and solidification, shrinkage, stress and other issues, such as to avoid or reduce the segregation of cracking copper casting, deformation, defects.
Second it is necessary to have a reasonable casting process. That is to say, according to the casting structure, weight and size, casting alloy characteristics and production conditions, choose the right parting surface and modeling, core making method, reasonably set casting rib, chill, riser and gating system. To guarantee the quality of the castings.
The third is the quality of the raw material used for casting. The quality of metal charge, refractory material, fuel and flux, modification agent and sand casting, sand binder, paint and other materials are substandard, will make the casting pinhole porosity, slag, sand and other defects, affecting the appearance quality and internal quality of casting, serious will cast scrap.
Fourth is the process operation, it is necessary to formulate reasonable technical operation regulations, improve the technical level of the workers, and make the process regulations put into practice correctly.
The wear resistance and dimensional stability of machine tool castings directly affect the precision of machine tools.
