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 Lebelo le lebelo e ne e le feela 3M / S. ho eketsa compactness ea lie-casting likarolo, 'me ho eketsa sethaleng sa khatello eketseha ka mor'a butle-butle, e ba mekhahlelo e meraro ea ente butle, ente e potlakileng le ho phahamiswa, e leng classic mekhahlelo e meraro ente.
