Flash formation in commercial aluminum pressure die-casting.

Abstract

The flash formation times in four types of casting processed by four types of pressure die casting machines (500-1650 tons) were studied by measuring the metal flow behavior in the die cavity and the plunger stopping time. The flash in the product area and near the overflow area was formed only when molten metal was filling in the cavity. The flash near the biscuit and runner area, however, occurred after the molten metal had filled in the cavity, as well as occurring while the molten metal was filling in the cavity. This result has also been demonstrated by the cross section structure of the flash.