Verfahren zum Herstellen von Gußstücken aus Leichtmetall und verlorene Form auf Basis von Sand hierfür

摘要

The invention concerns a method of producing light metal castings, in particular cylinder heads, cylinder blocks and/or crankcases for internal combustion engines, using a sand-based dead mould which forms a moulding cavity (2) for the casting. The casting mould comprises outer parts (3), at least one core (7) and at least one pressure pig-forming feeder. The casting mould is provided with a gate for molten metal which fills the mould cavity (2) under the effect of gravity. A covering core (5), which comprises at least one feeder (6) and is impermeable to gases at least in partial areas, is placed on the casting mould. Immediately after the filling operation, the feeder (6) filled with molten metal is subjected to pressure by a pressurized gas.