During the die-casting process of aluminum alloy die-casting machine, only one speed of the pressure-feed metal liquid enters its mold, and its injection speed is only 1m ~ 2m / s during operation. With this process, there are many internal pores in the casting, and the structure is loose. It was soon improved to a two-stage injection. The injection process was simply decomposed into two stages, slow and fast, but the fast Sipiidi yali 3m / s. yokka nga kyongera ku buzito bw’ebitundu ebikuba die, n’okugattako omutendera gwa puleesa okweyongera oluvannyuma lw’empola n’amangu, okufuuka emitendera esatu egy’okukuba empiso mpola, okukuba empiso amangu n’okutumbula, nga kino kye kipimo kya classic three-stage injection.
