Abstract: A method of reusing core sand includes crushing a core used for casting into granules; heating the granules at a temperature of 300° C. to 550° C.; causing the heated granules to collide against each other such that water glass used as a binder detaches from the core sand; and blowing air into a mixture of the water glass and the core sand, which are detached from each other, such that the core sand is separated and collected from the mixture due to a difference in specific gravity between the water glass and the core sand.

Abstract: A core forming device is equipped with a kneading tank in which raw materials of a core are kneaded, a raw material supply unit that supplies the raw materials to the kneading tank, a mold that accommodates a kneaded material including the raw materials kneaded in the kneading tank and that forms the core, a piston that injects the kneaded material into the mold, a position sensor that detects a position of the piston, and a control unit that controls a supply amount of the raw materials supplied to the kneading tank from the raw material supply unit. The control unit determines the supply amount of the raw materials based on a difference between the position of the piston upon completion of injection and a reference position of the piston.

Abstract: The present disclosure provides a method for manufacturing an aluminum alloy member capable of suppressing deterioration in ductility thereof. In the method for manufacturing an aluminum alloy member, an aluminum alloy casting material that contains 2.0 to 5.5 mass % of Cu, and 4.0 to 7.0 mass % of Si in which a content of Mg is 0.5 mass % or less, a content of Zn is 1.0 mass % or less, a content of Fe is 1.0 mass % or less, a content of Mn is 0.5 mass % or less and the balance is made of Al and inevitable impurities is used. The method for manufacturing an aluminum alloy member includes a heating and holding step of heating and holding the aluminum alloy casting material within a solid-liquid coexisting temperature region; and a quenching step of rapidly cooling the aluminum ally casting material after performing the heating and holding step.

Abstract: A method of reusing core sand includes: crushing a core used for casting into granules; heating the granules at a temperature of 300° C. to 550° C.; causing the heated granules to collide against each other such that water glass used as a binder detaches from the core sand; and blowing air into a mixture of the water glass and the core sand, which are detached from each other, such that the core sand is separated and collected from the mixture due to a difference in specific gravity between the water glass and the core sand.

Abstract: A mold-making device may include a stirring device including a stirring tank and at least one stirring blade. The stirring device may further include a packing port that is configured to open and close on a bottom of the stirring tank. The stirring device may stir a particulate aggregate and at least one additive by rotating the at least one stirring blade within the stirring tank to yield an admixture. A forming mold may communicate with the packing port and mold the admixture into a predetermined shape. A packing device may compress a surface of the admixture within the stirring tank and pack the admixture into the forming mold via the packing port.

Abstract: A method of reusing core sand includes crushing a core used for casting into granules; heating the granules at a temperature of 300° C. to 550° C.; causing the heated granules to collide against each other such that water glass used as a binder detaches from the core sand; and blowing air into a mixture of the water glass and the core sand, which are detached from each other, such that the core sand is separated and collected from the mixture due to a difference in specific gravity between the water glass and the core sand.

Abstract: To provide an apparatus for reclaiming foundry sand and a method for reclaiming foundry sand that can effectively remove binders and so on that attach to returned foundry sand that has been used. Foundry sand that has been used is supplied from a chute for feeding sand 14A to a rotor 16. The rotor 16 is rotated by a driver 20 so that frictional force is generated on the sand in the rotor 16. Then, the sand in the rotor 16 is dropped into the container for washing with water 30 that is located below the rotor 16. In the container for washing with water 30, an agitator 34 is rotated by the driver 20 so that the sand in the container for washing with water 30 is agitated and washed with water.

Abstract: A molding method of a sand mold including a hardened layer in a predetermined thickness range from an outer layer part, includes: forming a cavity and a filling opening of a die so that a dimension, which is a largest dimension between two intersections of straight lines passing through a section of a boundary portion between the cavity and the filling opening of the die, with respect to an outside line of the section, is less than a predetermined ratio with respect to a thickness dimension of that part of a product portion of the sand mold from which a blowing opening molded in the filling opening projects, the product portion being formed by the cavity of the die; and filling foamed sand into the cavity from the filling opening of the die.

Abstract: First, a supply device supplies a foamed kneaded material into a cylinder. Then, in a state in which an internal space of the cylinder is communicated with a pattern forming space of a mold, the piston disposed in the cylinder is moved toward the foamed kneaded material side while opening a gas release hole formed piercing through the piston. Then, at a timing when the piston has reached an expected position where the piston is expected to be on contacting the foamed kneaded material supplied into the cylinder, the gas release hole is closed by an open-close plug. Then, the foamed kneaded material supplied into the cylinder is pressed toward the pattern forming space side of the mold by moving the piston toward the foamed kneaded material side.

Abstract: A molding method of a sand mold including a hardened layer in a predetermined thickness range from an outer layer part, includes: forming a cavity and a filling opening of a die so that a dimension, which is a largest dimension between two intersections of straight lines passing through a section of a boundary portion between the cavity and the filling opening of the die, with respect to an outside line of the section, is less than a predetermined ratio with respect to a thickness dimension of that part of a product portion of the sand mold from which a blowing opening molded in the filling opening projects, the product portion being formed by the cavity of the die; and filling foamed sand into the cavity from the filling opening of the die.

Abstract: Sand for a casting mold including sand, a binder, and an inorganic compound particle having poor water solubility and generating a gas, which is at least one of water vapor or carbon dioxide gas, by heat from a molten metal.

Abstract: [Task] There is provided a mold release agent for forming a water glass-containing sand mold with high release properties which can prevent attachment of a water glass to a flask and the accumulation of the water glass on the flask in the formation of the sand mold when using the water glass as a binder. [Solution] The mold release agent for forming the water glass-containing sand mold is structured to contain an organic compound, the organic compound having a proton-donating functional group that reacts with the water glass to produce silicon dioxide. The water glass contained in a raw material for the sand mold reacts with the proton-donating functional group contained in the mold release agent so as to produce silicon dioxide. Since silicon dioxide has no adhesion, it can prevent that the attachment (fixing) of the water glass contained in a formed sand mold to the flask and the accumulation of the water glass on the flask.

Abstract: A method of reusing core sand includes: crushing a core used for casting into granules; heating the granules at a temperature of 300° C. to 550° C.; causing the heated granules to collide against each other such that water glass used as a binder detaches from the core sand; and blowing air into a mixture of the water glass and the core sand, which are detached from each other, such that the core sand is separated and collected from the mixture due to a difference in specific gravity between the water glass and the core sand.

Abstract: [Task] There is provided a mold release agent for forming a water glass-containing sand mold with high release properties which can prevent attachment of a water glass to a flask and the accumulation of the water glass on the flask in the formation of the sand mold when using the water glass as a binder. [Solution] The mold release agent for forming the water glass-containing sand mold is structured to contain an organic compound, the organic compound having a proton-donating functional group that reacts with the water glass to produce silicon dioxide. The water glass contained in a raw material for the sand mold reacts with the proton-donating functional group contained in the mold release agent so as to produce silicon dioxide. Since silicon dioxide has no adhesion, it can prevent that the attachment (fixing) of the water glass contained in a formed sand mold to the flask and the accumulation of the water glass on the flask.

Abstract: A molding method of a sand mold including a hardened layer in a predetermined thickness range from an outer layer part, includes: forming a cavity and a filling opening of a die so that a dimension, which is a largest dimension between two intersections of straight lines passing through a section of a boundary portion between the cavity and the filling opening of the die, with respect to an outside line of the section, is less than a predetermined ratio with respect to a thickness dimension of that part of a product portion of the sand mold from which a blowing opening molded in the filling opening projects, the product portion being formed by the cavity of the die; and filling foamed sand into the cavity from the filling opening of the die.

Abstract: A mold forming apparatus includes: a storage tank having in its bottom injection ports capable of being opened and closed, and storing a foamed mixture; a forming mold having runners, corresponding to injection ports, into which the foamed mixture is introduced through storage tank injection ports, and having cavities for forming the introduced foamed mixture into a mold in a predetermined shape; and a pressing device disposed to correspond to the forming mold and pressing the foamed mixture stored in the storage tank to inject the foamed mixture into cavities through runners of the forming mold. A parting surface of the forming mold is formed parallel to a pressing direction of the pressing device, and runners of the forming mold are formed in the parting surface and are tilted with respect to the pressing direction of the pressing device to spread apart from inlets toward outlets guided to the cavities.

Abstract: Sand for a casting mold including sand, a binder, and an inorganic compound particle having poor water solubility and generating a gas, which is at least one of water vapor or carbon dioxide gas, by heat from a molten metal.

Abstract: By mixing, stirring and kneading, with water glass (11) as a binder, sand (7), a surfactant (9), and water (10), foamed sand (S) is generated. The foamed sand (S) is packed in a cavity of a metallic mold and solidified to form a sand mold. By using the sand mold, aluminum is cast. By using water glass that is an inorganic binder, during casting, harmful gas and odor are not generated. Further, when a molar ratio n of water glass (Na2O nSiO2 mH2O) is adjusted in the range of 0.65 to 1.30, a quantity of water (H2O) generated by heating water glass with a high temperature melt during casting can be suppressed. Thereby, hydrogen gas (H2) according to a reaction between water (H2O) and aluminum (Al) can be suppressed from being generated and casting quality can be improved.

Abstract: A mold-making device may include a stirring device including a stirring tank and at least one stirring blade. The stirring device may further include a packing port that is configured to open and close on a bottom of the stirring tank. The stirring device may stir a particulate aggregate and at least one additive by rotating the at least one stirring blade within the stirring tank to yield an admixture. A forming mold may communicate with the packing port and mold the admixture into a predetermined shape. A packing device may compress a surface of the admixture within the stirring tank and pack the admixture into the forming mold via the packing port.

Abstract: A sand-mold molding method for producing a molded article obtained by packing foamed sand may include stirring a binder with an aggregate to form foamed sand; forming a cavity via clamping a metallic mold closed; packing the foamed sand into the cavity of the metallic mold and then heating and solidifying the foamed sand; and opening the metallic mold partially to provide a gap in the metallic mold while maintaining the cavity.