Density: precision die casting die, density product die casting die, extrusion and vacuum die casting die. The basic process of die casting is: the liquid metal is first cast at low speed or high speed and filled into the cavity of the die. The die has a movable cavity surface, which is forged under pressure with the cooling process of the liquid metal, which not only eliminates the shrinkage defects of the blank, but also enables the internal structure of the blank to reach the broken grain in the forging state. The comprehensive mechanical properties of the blank have been significantly improved.