A first die segment for forming an internal combustion engine block has cylindrical projections, and die core pieces disposed about the cylindrical projections. A second die segment has die core stubs positioned so as to extend between adjacent die core pieces when the segments are brought together. An engine block formed by the die segments has cylindrical bores formed by the cylindrical projections extending from the deck of the block and voids formed by the die core pieces also extending from the deck and disposed about the cylindrical bores. Pockets formed by the die core stubs extend into sides of the engine block between adjacent voids. The engine block is worked below the level of the deck to undercut each of the pockets, removing material between them and the voids to result in an interconnected water jacket extending about the cylindrical bores, while leaving the deck closed.

The present invention provides piston production device and piston production method capable of surely holding friction-resistant ring regardless of presence or absence of decrease in accuracy of outside diameter of holding pin. Device has lower mold provided thereinside with cavity for forming piston and having opening, upper mold provided movably to open/close opening of cavity, and three holding pins rotatably supported by holding holes of upper mold and having top end portions protruding from lower surface of upper mold. Top end portions have flat holding surfaces formed by cutting tip end sides of top end portions in half from tip end edges along axial direction and stepped surfaces formed from upper ends of holding surfaces toward radial direction. By rotating holding pins in synchronization with each other in the same direction, friction-resistant ring is held by three points of holding surfaces.

The present invention provides piston production device and piston production method capable of surely holding friction-resistant ring regardless of presence or absence of decrease in accuracy of outside diameter of holding pin. Device has lower mold provided thereinside with cavity for forming piston and having opening, upper mold provided movably to open/close opening of cavity, and three holding pins rotatably supported by holding holes of upper mold and having top end portions protruding from lower surface of upper mold. Top end portions have flat holding surfaces formed by cutting tip end sides of top end portions in half from tip end edges along axial direction and stepped surfaces formed from upper ends of holding surfaces toward radial direction. By rotating holding pins in synchronization with each other in the same direction, friction-resistant ring is held by three points of holding surfaces.

A metal casting method and a plastic injection molding method in which an insert is molded in molten material such that no molten material enters the interior of the insert. At the usage of a wire thread insert as insert this has the advantage that for example in an aluminum cast part thread holes can be produced already as part of the casting process. For this purpose, the present disclosure describes an the casting mold, the insert as well as the casting method.

A metal casting method and a plastic injection molding method in which an insert is molded in molten material such that no molten material enters the interior of the insert. At the usage of a wire thread insert as insert this has the advantage that for example in an aluminum cast part thread holes can be produced already as part of the casting process. For this purpose, the present disclosure describes an the casting mold, the insert as well as the casting method.

A hybrid core driving device of an embodiment includes: a cylinder tube; a first cover member at one end of the cylinder tube; a second cover member at the other end thereof; a rod in the cylinder tube, having a connecting portion at one end to be connectable to a core and an annular flange on the side of the second cover member, and penetrating the first cover member; a nut fixed to the rod; a screw shaft penetrating the second cover member and the nut and provided to be insertable into the rod; a motor rotating the screw shaft; a piston in the cylinder tube, allowing the rod to penetrate therethrough, and slidable with respect to the cylinder tube and the rod; and a connection portion connectable to a pipe supplying a hydraulic liquid to a region surrounded by the cylinder tube, the first cover member, and the piston.

An assembly for producing a molding, made of removable material, of a turbomachine blade, includes an injection mold for the removable material in which a first core element and a second core element are mounted in a predetermined molding position, wherein the first and second core elements extend in a first direction. The mold includes a first face for molding a pressure-side face of the blade and a second face for molding a suction-side face of the blade and arranged facing the first face in a second direction perpendicular to the first direction. Retaining members hold the cores in position in the injection mold.

An assembly for producing a molding, made of removable material, of a turbomachine blade, includes an injection mold for the removable material in which a first core element and a second core element are mounted in a predetermined molding position, wherein the first and second core elements extend in a first direction. The mold includes a first face for molding a pressure-side face of the blade and a second face for molding a suction-side face of the blade and arranged facing the first face in a second direction perpendicular to the first direction. Retaining members hold the cores in position in the injection mold.

A cover die holder block for a high-pressure die casting apparatus includes: a first cover die holder block component having defined therein at least a portion of a cover die holder block pocket surface configured to accommodate at least one die insert defining a mold surface, and at least portions of two opposing lock faces adjacent the cover die holder block pocket surface; and a second cover die holder block component, the second cover die holder block component having two projections extending therefrom, each projection being accommodated in a corresponding recess defined in the first cover die holder block component behind a respective lock face, in a direction of largest stress applied to the lock face during operation. The first and second cover die holder block components are separately fabricated and are connected to yield the cover die holder block.

A cover die holder block for a high-pressure die casting apparatus includes: a first cover die holder block component having defined therein at least a portion of a cover die holder block pocket surface configured to accommodate at least one die insert defining a mold surface, and at least portions of two opposing lock faces adjacent the cover die holder block pocket surface; and a second cover die holder block component, the second cover die holder block component having two projections extending therefrom, each projection being accommodated in a corresponding recess defined in the first cover die holder block component behind a respective lock face, in a direction of largest stress applied to the lock face during operation. The first and second cover die holder block components are separately fabricated and are connected to yield the cover die holder block.