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 Ti kapartak ket 3M laeng / s. a mangpaadu ti kinakompakto dagiti paset ti die-casting, ken pananginayon ti maysa a tukad ti panagadu ti presion kalpasan ti nabannayat ken napardas, agbalin a tallo a tukad ti nabannayat nga ineksion, napardas nga ineksion ken panangitandudo, nga isu daytoy ti klasiko a tallo-a-tukad a panangineksion..
