Die casting machine for manufacturing heat resistant impellers

Claim 1

A die casting machine for manufacturing a heat resistant impeller having substantially curved blades, comprising: a die assembly provided with a plurality of die segments displaceable substantially radially with respect to the axis thereof between an inner closed position and an outer closed position, and means for causing such displacements of the die segments, the die segments including cavity forming portions and runner forming portions, while the die segments are in their inner closed position the cavity forming portions defining a cavity and the runner forming portions defining a runner communicating with the cavity, the cavity forming portions of the die segments being formed with first recesses to provide rib-shaped projections extending outwardly from the periphery of the blades of the impeller; an injection assembly disposed below the die assembly and provided with an injection sleeve arranged coaxially with the axis of the die segments, a plunger reciprocally arranged within the sleeve, and means for driving the plunger; and means for displacing the die assembly axially between an uppermost position in which the die assembly is spaced from the injection assembly to permit molten metal to be poured into the sleeve and a lowermost position in which the runner defined by the die segments is brought into communication with the interior of the sleeve.