Abstract: A mold replacement method that can contribute to simplification of unloading a fixed mold and a movable mold when the fixed mold and the movable mold are replaced. A mold replacement method includes coupling a fixed mold to a movable mold in a vertically divided molding machine, releasing a coupled state between the movable mold and a movable mold equipment base, rotating the fixed mold and the movable mold by a rotating mechanism for rotating a fixed mold equipment base, and disposing the movable mold above the fixed mold, releasing the coupled state between the fixed mold and the fixed mold equipment base, and unloading the fixed mold and movable mold from a fixed mold equipment base while a protrusion protruding outward from the movable mold is being supported by a fork of a lifting and lowering device.

Abstract: A core manufacturing apparatus includes: a storage unit that stores core sand; a kneading vessel configured to be fed with the core sand; a kneading rod configured to knead the core sand; and a piston configured to eject the kneaded core sand. The kneading vessel is capable of transitioning between a horizontally lying state and a vertically standing state and configured to be fed with the core sand in the horizontally lying state. The piston is configured to eject the core sand downward and pack it into a mold with the kneading vessel in the vertically standing state. The storage unit includes a valve that opens and closes the feed port. The storage unit is coupled to the kneading vessel so as to be turnable around a second shaft and configured to maintain the same posture with the valve in contact with the feed port while the kneading vessel turns.

Abstract: A core manufacturing apparatus includes: a storage unit that stores core sand; a kneading vessel configured to be fed with the core sand; a kneading rod configured to knead the core sand; and a piston configured to eject the kneaded core sand. The kneading vessel is capable of transitioning between a horizontally lying state and a vertically standing state and configured to be fed with the core sand in the horizontally lying state. The piston is configured to eject the core sand downward and pack it into a mold with the kneading vessel in the vertically standing state. The storage unit includes a valve that opens and closes the feed port. The storage unit is coupled to the kneading vessel so as to be turnable around a second shaft and configured to maintain the same posture with the valve in contact with the feed port while the kneading vessel turns.

Abstract: A manufacturing method for a mold adhesive according to an aspect of the disclosure includes a step of preparing aqueous solution containing water glass, a step of heating the aqueous solution to 90° C. or higher but not exceeding 100° C., and a step of extracting gelled water glass as the mold adhesive, the gelled water glass being separated on a liquid surface of the heated aqueous solution. A solid component of the prepared aqueous solution falls within a range of 25 mass % or higher but not exceeding 35 mass %.

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: 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: [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: 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: 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: 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 (Na20 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.