The process of casting metal mold is to heat the metal material to a molten state, then pour it into the mold, and after the metal cools and solidifies, take out the mold to get the required metal products. This is because the metal will reach the melting point during heating and melt into liquid state, but it will gradually lose heat during cooling, so that the metal molecules will rearrange and solidify into solid state. This process is based on the physical properties and phase transformation law of metal, and the solidification of metal is realized by controlling temperature and cooling rate.