A method for manufacturing a light alloy wheel that includes a substantially annular rim part and a disc part that is joined to one edge of the rim part on an inner side and is to be attached to an axle. The method includes a molten metal pouring step for pouring a light alloy molten metal from a sprue opened into a mold cavity formed into a shape of the rim part, and a forced cooling step for, after the molten metal pouring step, forcibly cooling the light alloy molten metal poured into the mold cavity formed into the shape of the rim part such that one predetermined cooling unit of a plurality of cooling units provided along an entire circumference on an outer side or an inner side of the mold cavity formed into the shape of the rim part is first operated and an other cooling unit thereof is then operated.

Piston has crown portion 2 having crown surface 2a defining combustion chamber, thrust-side and anti-thrust-side skirt portions 3a, 3b formed integrally with crown portion and sliding on cylinder wall surface, a pair of apron portions 4a, 4a joined to skirt portions in circumferential direction, recessed portion 6 formed on back surface that is opposite side to crown surface and extending between skirt portions along substantially longitudinal direction, and a plurality of protrusions 7 formed integrally with bottom surface of recessed portion and extending along arrangement direction of skirt portions. At least one end edge in longitudinal direction of protrusion is integrally connected to inner side surface, facing one end edge of protrusion, of recessed portion. Adequate transcription performance to molding surface can therefore be ensured while removing remains of air on bottom side of recessed portion of mold for molding protrusions on crown portion back surface during casting.

Piston has crown portion 2 having crown surface 2a defining combustion chamber, thrust-side and anti-thrust-side skirt portions 3a, 3b formed integrally with crown portion and sliding on cylinder wall surface, a pair of apron portions 4a, 4a joined to skirt portions in circumferential direction, recessed portion 6 formed on back surface that is opposite side to crown surface and extending between skirt portions along substantially longitudinal direction, and a plurality of protrusions 7 formed integrally with bottom surface of recessed portion and extending along arrangement direction of skirt portions. At least one end edge in longitudinal direction of protrusion is integrally connected to inner side surface, facing one end edge of protrusion, of recessed portion. Adequate transcription performance to molding surface can therefore be ensured while removing remains of air on bottom side of recessed portion of mold for molding protrusions on crown portion back surface during casting.

The invention relates to a method for producing a helix (2). A permanent mold with mold halves which can be joined together on a mold separation plane is provided. The mold halves of the permanent mold are joined together such that the permanent mold has a cavity, which defines the shape of the helix (2) or the shape of a bent-up helix, when the permanent mold is joined together. The specified helix (2) or the bent-up helix has a flattened profiled winding cross-section which has two opposite flat faces (2.1, 2.1′), an outer face and an inner face (2.3) opposite the outer face. The mold separation plane runs at least partly along the flat faces (2.1, 2.1′) from the inner face to the outer face (2.3), wherein the permanent mold has a bulge (2.5) which extends along the mold separation plane and protrudes into the cavity at least in a region in which the mold separation plane runs along one of the flat faces (2.1, 2.1′) such that the cast body is provided with recesses (2.5) on the flat faces (2.1, 2.1′). The invention further relates to a permanent mold for carrying out the method and to a helix which has been produced using the method or using the permanent mold.

The invention relates to a method for producing a helix (2). A permanent mold with mold halves which can be joined together on a mold separation plane is provided. The mold halves of the permanent mold are joined together such that the permanent mold has a cavity, which defines the shape of the helix (2) or the shape of a bent-up helix, when the permanent mold is joined together. The specified helix (2) or the bent-up helix has a flattened profiled winding cross-section which has two opposite flat faces (2.1, 2.1′), an outer face and an inner face (2.3) opposite the outer face. The mold separation plane runs at least partly along the flat faces (2.1, 2.1′) from the inner face to the outer face (2.3), wherein the permanent mold has a bulge (2.5) which extends along the mold separation plane and protrudes into the cavity at least in a region in which the mold separation plane runs along one of the flat faces (2.1, 2.1′) such that the cast body is provided with recesses (2.5) on the flat faces (2.1, 2.1′). The invention further relates to a permanent mold for carrying out the method and to a helix which has been produced using the method or using the permanent mold.

A core (1) for producing castings (100) in a modular mould; each casting (100) having at least one thermally activatable portion (102) shaped so that it can face a heat source (HS); each casting (100) having at least one duct (106) contained inside the portion (102); the duct (106) being fluid tight so that a fluid can flow through it; the core (1) having a suitable shape to form, in negative, the duct (106); the core (1) comprising at least one insert (20)(20′)(20″) shaped so as to define at least two passages (200)(200′) for the fluid inside the duct (106).

The present invention provides a mold casting device including a raising and lowering mechanism that raises and lowers the upper mold; a die plate that is fixed to the upper mold; and a base member that is provided on upper end portions of the raising and lowering mechanism and supports the die plate from below.

The present invention provides a mold casting device including a raising and lowering mechanism that raises and lowers the upper mold; a die plate that is fixed to the upper mold; and a base member that is provided on upper end portions of the raising and lowering mechanism and supports the die plate from below.

A casting device includes a mold provided with an insert die, a molten metal supply device for supplying molten metal into the mold, and a gas supply mechanism for supplying a gas, which is used for forced cooling, to the insert die. The insert die is made of tungsten having a thermal conductivity significantly higher than that of die steel. The insert die has a spiral or meandering gas passage therein. The spiral or meandering gas passage has a passage length much longer than a straight passage.

A casting device includes a mold provided with an insert die, a molten metal supply device for supplying molten metal into the mold, and a gas supply mechanism for supplying a gas, which is used for forced cooling, to the insert die. The insert die is made of tungsten having a thermal conductivity significantly higher than that of die steel. The insert die has a spiral or meandering gas passage therein. The spiral or meandering gas passage has a passage length much longer than a straight passage.