Precision casting is the casting metal liquid poured into a certain mould, through the cold treatment of the casting parts. Precision casting parts casting process there are many, including metal casting, pressure casting, investment casting, lost foam casting and V casting and so on. Precision casting process made of casting parts finished product is more precise, later can not be reprocessing treatment, or only a very small amount of processing. At the same time, precision casting can be completed in complex shapes, the thickness of the casting of thin castings, not only for small castings, large castings can also be easily completed. From the point of view of the current situation, the world's precision casting forming process is developing rapidly, with a wide range of applications. In the future, the development trend of the precision casting process is casting products are increasingly close to parts and components products. General casting relative to precision casting parts are more rough, belong to the scope of forging.
General casting is in the case of high pressure at a high rate of liquid metal quickly filled with casting entity model, under pressure, so that it solidifies, and later still need to be put into use through the later finishing process. However, because of the casting multi-material multifaceted external forces, casting parts in the process of solidification and moulding of the deformation of the situation often occurs. General casting is usually applied to the equipment and machinery used in the geometric dimensional tolerances and the use of the castings of the performance needs are not high.
Precision casting and general casting belong to two different casting methods, the main difference is reflected in the dimensional accuracy, surface finish and sales price, but the higher standard of precision casting, casting better performance. So through these two different methods manufactured agricultural machinery casting, automobile casting parts, pump casting parts will also be different.