Cast sort a lot of, by modelling method customarily cent is:1. Common sand mold is cast, include wet sand mold, dry sand mold and chemical and sclerotic sand mold 3 kinds. 2. Special type is cast, by modelling material can divide the particular kind that wants modelling material to be given priority to with arenaceous stone of crude mineral products to cast again (if fusible pattern is cast, mud cast, foundry carapace cast, negative pressure is cast, Cast production to have the characteristic that differs with other technology, basically be adaptability wide, need to use material and device environment of much, pollution. Cast production to be able to produce the pollution of dust, harmful gas and noise to the environment, compared with other machine workmanship comes more serious, need adopts measure to undertake controlling. Be opposite as modern society energy-saving requirement and the voice that protect to environment are louder and louder, the trend that casts product development more incline to the integral performance at cast, taller precision, fewer surplus and more bright and clean surface, because this new casting alloy will get developing, new facility new technology will appear accordingly, nicety casts the line of vision that takes people gradually, nicety casts opposite tradition cast industry and character, have more exact figure and taller cast precision.