Abstract: Molten metal M is raised to the vicinity of a gate 11 of a cavity 9C by increasing the pressure in a holding furnace 5 with gas, and thereafter the cavity 9C is filled with the molten metal M by decreasing the pressure in the cavity 9C by suction and further increasing the pressure in the holding furnace 5. Thereafter, the decompression of the cavity 9C is stopped after a preset filling time, and the compression of the holding furnace 5 is stopped when solidification of the molten metal M is completed. In this way, the suction is minimized, and it becomes possible to employ a simple decompression part 14. A reduction in equipment cost and production cost is thereby achieved, and a reduction in casting cycle time is also achieved.

Abstract: A suction pressure casting method uses a casting device that includes a holding furnace for accumulating molten metal, a metal mold and a core forming a cavity, a molten-metal pressurizing tank that supplies a pressurizing gas, and a suction and exhaust tank for sucking and exhausting the inside of the cavity. A preset decompression pattern of a casting process is compared with a measured pressure pattern of the cavity and the core that is measured during actual casting. A corrected decompression pattern is calculated based on a difference therebetween. The preset decompression pattern at the time of the next casting is then corrected by using the corrected decompression pattern.

Abstract: A low-pressure casting device is provided with a holding furnace, a stoke, a pressure control device and a molten-metal level sensor. The holding furnace holds molten metal. The stoke supplies molten metal into a casting mold via a sprue. The pressure control device moves the molten metal in the stoke and fills the molten metal in the casting mold. The molten-metal level sensor detects a surface level of the molten-metal in the stoke. The stoke has a lower end immersed in the molten metal in the holding furnace. The low-pressure casting device is configured to correct filling of the molten metal in the casting mold in a next casting based on the height of the molten metal surface detected by the molten-metal level sensor.

Abstract: A core discharge device is provided for discharging a sand core from a cast material in which the sand core contains a binder having water glass. The core discharge device includes a humidified gas supply device that supplies humidified gas to the sand core inside the cast molded article. The humidified gas is a gas to which humidity has been added and from which droplets have been removed.

Abstract: A low-pressure casting apparatus includes a core that together with a mold forms a cavity and a reduced-pressure dryer configured to dry the core under reduced pressure. The core is disposed in the mold, the molded is closed, the core is dried under reduced pressure, and thereafter the cavity is filled with molten metal.

Abstract: Molten metal M is raised to the vicinity of a gate 11 of a cavity 9C by increasing the pressure in a holding furnace 5 with gas, and thereafter the cavity 9C is filled with the molten metal M by decreasing the pressure in the cavity 9C by suction and further increasing the pressure in the holding furnace 5. Thereafter, the decompression of the cavity 9C is stopped after a preset filling time, and the compression of the holding furnace 5 is stopped when solidification of the molten metal M is completed. In this way, the suction is minimized, and it becomes possible to employ a simple decompression part 14. A reduction in equipment cost and production cost is thereby achieved, and a reduction in casting cycle time is also achieved.

Abstract: A core discharge device is provided for discharging a sand core from a cast material in which the sand core contains a binder having water glass. The core discharge device comprises a humidified gas supply device that supplies humidified gas, to which humidity has been added, to the sand core inside the cast molded article.

Abstract: A suction pressure casting method uses a casting device that includes a holding furnace for accumulating molten metal, a metal mold and a core forming a cavity, a molten-metal pressurizing tank that supplies a pressurizing gas, and a suction and exhaust tank for sucking and exhausting the inside of the cavity. A preset decompression pattern of a casting process is compared with a measured pressure pattern of the cavity and the core that is measured during actual casting. A corrected decompression pattern is calculated based on a difference therebetween. The preset decompression pattern at the time of the next casting is then corrected by using the corrected decompression pattern.

Abstract: A low-pressure casting apparatus includes a core that together with a mold forms a cavity and a reduced-pressure dryer configured to dry the core under reduced pressure. The core is disposed in the mold, the molded is closed, the core is dried under reduced pressure, and thereafter the cavity is filled with molten metal.

Abstract: A low-pressure casting device is provided with a holding furnace, a stoke, a pressure control device and a molten-metal level sensor. The holding furnace holds molten metal. The stoke supplies molten metal into a casting mold via a sprue. The pressure control device moves the molten metal in the stoke and fills the molten metal in the casting mold. The molten-metal level sensor detects a surface level of the molten-metal in the stoke. The stoke has a lower end immersed in the molten metal in the holding furnace. The low-pressure casting device is configured to correct filling of the molten metal in the casting mold in a next casting based on the height of the molten metal surface detected by the molten-metal level sensor.

Abstract: A divider plate for two or more inlet ports provided in a cylinder head of an internal-combustion engine comprises divider portions that divides inside of the two or more inlet ports along an intake air flow, a side cast-in insert portion provided on at least one side portion located in a direction perpendicular to that of the intake air flow, that is enclosed by molten metal during casting of the cylinder head, an inner cast-in insert portion that is provided between the divider portions, that is enclosed by the molten metal during the casting of the cylinder head, and an inner accelerator formed in the inner cast-in insert portion, accelerates coagulation of the molten metal, wherein the inner accelerator has at least one of a plurality of holes, a concave portion, a convex portion, and a concave-convex portion, or a combination of a hole and a concave portion, a convex portion or a concave-convex portion.

Abstract: A divider plate for two or more inlet ports provided in a cylinder head of an internal-combustion engine comprises divider portions that divides inside of the two or more inlet ports along an intake air flow, a side cast-in insert portion provided on at least one side portion located in a direction perpendicular to that of the intake air flow, that is enclosed by molten metal during casting of the cylinder head, an inner cast-in insert portion that is provided between the divider portions, that is enclosed by the molten metal during the casting of the cylinder head, and an inner accelerator formed in the inner cast-in insert portion, accelerates coagulation of the molten metal, wherein the inner accelerator has at least one of a plurality of holes, a concave portion, a convex portion, and a concave-convex portion, or a combination of a hole and a concave portion, a convex portion or a concave-convex portion.

Abstract: A partition plate for an intake port of a cylinder head to be manufactured by cast molding is preliminarily set prior to the cast molding in a sand core applied to form the intake port and then cast in by the cast molding to partition the intake port into a plurality of ports. The partition plate is provided with an intake-side distal end, a cylinder-side distal end, a pair of side edges continuous with the intake-side distal end and the cylinder-sided distal end and to be cast in by molten metal during the cast molding. Each of the pair of side edges having end faces facing in a thickness direction and a side end face continuous with the end faces. The partition plate is further provided with a promoter section provided on at least one of the side end face and the end faces of each of the pair of side edges to promote solidification of the molten metal.

Abstract: A partition plate for an intake port of a cylinder head to be manufactured by cast molding is preliminarily set prior to the cast molding in a sand core applied to form the intake port and then cast in by the cast molding to partition the intake port into a plurality of ports. The partition plate is provided with an intake-side distal end, a cylinder-side distal end, a pair of side edges continuous with the intake-side distal end and the cylinder-sided distal end and to be cast in by molten metal during the cast molding. Each of the pair of side edges having end faces facing in a thickness direction and a side end face continuous with the end faces. The partition plate is further provided with a promoter section provided on at least one of the side end face and the end faces of each of the pair of side edges to promote solidification of the molten metal.