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 Fast celeritas tantum 3m / S {{X}} augendae in compagitatem de mori, mittentes partes, et addendo a gradu pressura incremento post tardus et ieiunium, iniectio tria, quae est classic tres-iniectio, {}}}
