METHOD FOR PRODUCING CASTING MOULDS FOR PRESSURE DIECASTING, PARTICULARLY FOR CASTING ALUMINIUM ALLOY CROSSPIECIES, AND A PRESSURE DIECASTING MOULD THEREFOR

摘要

The offered mould is a combination of a steel fixed mould section (1) and a steel movable mould section (2). Shape defining pieces are located in the fixed mould section (1) and the movable mould section (2). The surface of the shape defining piece in the fixed mould section (1) is shaped as a pentacle. A core (1c) protrudes from the fixed mould section. The bottom of the shape defining piece surface in the fixed mould section (1) is concave. The holes constituting the cooling runners (8) of the movable mould section (2) are distributed symmetrically on both sides of the arms (6). When the fixed mould section (1) is put together with the movable section (2), the outer edges of the moulding piece in the fixed mould section (1) adhere to the outer edges of the moulding piece in the movable mould section (2). Pockets (10) are present in the seat pit surface of the fixed mould section (1), and cooling runner holes (11) and attachment holes (12) pass through the wall of the fixed mould section (1). Cooling and moulding inserts (13) are set in the pockets (10) so that fragments of their surface constitute the fragments of the seat pocket surface in the fixed mould section (1). Cooling runners (13a) of the cooling and moulding insert (13) are present in the cooling inserts (11), with routes resembling a coil. The cooling runners (4) are hydraulically connected with the cooling runners (13a) of the cooling and moulding inserts (13). The cooling and moulding inserts (13) are immobilised in the fixed mould section (1).