The density of the parts is slightly lower than that of physical forging. The as-cast extrusion density of liquid die forging can reach about 2.8. At high density, after T4 and T6 heat treatment, the tensile strength/yield strength/elongation/hardness have almost the same mechanical properties as forging; it has unique advantages in welding. The frame has been tested for 100,000 times of fatigue testing after effective welding to obtain an excellent grade.