Machine bed casting casting process of production, pouring should follow the high temperature baked, low temperature pouring principle. Because the increase in the temperature of the molten metal is conducive to the complete melting of inclusions, slag floating, easy to slag and degassing to reduce the machine tool cast slag and porosity defects; the use of lower pouring temperature, is conducive to reducing the metal liquid Of the gas solubility, liquid shrinkage and high temperature metal liquid on the cavity surface baking, to avoid the formation of pores, sticky sand and shrinkage and other defects. Therefore, to ensure full of mold cavity under the premise, try to use a lower pouring temperature. The operation of pouring molten metal from the ladle into the mold is called pouring. Improper pouring operation can cause defects such as insufficient pouring, cold septum, stomata, shrinkage and slagging, etc., and cause personal injury.