The invention names a method for producing a lost casting core (G), which has a side surface (S1, S2), in a core box (1) that is divided into two core box parts (2, 3) in a parting plane (T), and which box delimits a mold cavity (8) in which an inner surface (14, 15) that reproduces the side surface (S1, S2) of the casting core (G) is provided, through which surface the parting plane (T) of the core box (1) runs. To prevent a burr in a critical section of the side surfaces (S1, S2) of the casting core (G), the following work steps are carried out: (a) producing a casting core insert (E) having a side surface section (SF1, SF2) that is equal to a corresponding section of the side surface of the casting core (G), from a casting core molding material (F); (b) positioning the casting core insert (E) in the mold cavity (8) of the core box (1) in such a manner that the side surface section (SF1, SF2) of the casting core insert (E) sits in the place of the corresponding section of the side surface (S1, S2) of the finished casting core (G), wherein the parting plane (T) runs through the side surface section (SF1, SF2); (c) introducing a casting core molding material (F) into the mold cavity (8) of the core box (1), so as to form the remaining casting core (G), wherein the introduced casting core molding material (F) comes into contact with the casting core insert (E); (d) solidifying the casting core molding material (F), thereby forming a shape-fit and/or material-fit connection between the introduced casting core molding material (F) and the casting core insert (E).

The invention names a method for producing a lost casting core (G), which has a side surface (S1, S2), in a core box (1) that is divided into two core box parts (2, 3) in a parting plane (T), and which box delimits a mold cavity (8) in which an inner surface (14, 15) that reproduces the side surface (S1, S2) of the casting core (G) is provided, through which surface the parting plane (T) of the core box (1) runs. To prevent a burr in a critical section of the side surfaces (S1, S2) of the casting core (G), the following work steps are carried out: (a) producing a casting core insert (E) having a side surface section (SF1, SF2) that is equal to a corresponding section of the side surface of the casting core (G), from a casting core molding material (F); (b) positioning the casting core insert (E) in the mold cavity (8) of the core box (1) in such a manner that the side surface section (SF1, SF2) of the casting core insert (E) sits in the place of the corresponding section of the side surface (S1, S2) of the finished casting core (G), wherein the parting plane (T) runs through the side surface section (SF1, SF2); (c) introducing a casting core molding material (F) into the mold cavity (8) of the core box (1), so as to form the remaining casting core (G), wherein the introduced casting core molding material (F) comes into contact with the casting core insert (E); (d) solidifying the casting core molding material (F), thereby forming a shape-fit and/or material-fit connection between the introduced casting core molding material (F) and the casting core insert (E).

A core molding method is a method of molding a core using a metal mold that is pressure-fed with mulled sand, and includes heating the metal mold such that the temperature of the metal mold reaches a temperature higher than a predetermined baking temperature, pressure-feeding the heated metal mold with the mulled sand, holding the temperature of the metal mold having been pressure-fed with the mulled sand at the baking temperature, and removing the core from the metal mold after the holding.

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.

Provided is a core manufacturing apparatus including: a storage unit configured to store 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 and pack the core sand into a mold with the kneading vessel in the vertically standing state. The storage unit is turnably coupled to the kneading vessel and configured to remain coupled to the kneading vessel in the same posture while the kneading vessel turns.

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.

Provided is a core manufacturing apparatus including: a storage unit configured to store 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 and pack the core sand into a mold with the kneading vessel in the vertically standing state. The storage unit is turnably coupled to the kneading vessel and configured to remain coupled to the kneading vessel in the same posture while the kneading vessel turns.

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.

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.

A method for producing a ceramic core, and such a core, for preparing the production of a casting having hollow structures. The ceramic core configured to form, making use of a 3D model of digital geometric co-ordinates of the casting. The method involves unpressurized or low-pressure casting of a ceramic core blank, and specifically with an oversize relative to the core according to the geometric co-ordinates, and CNC processing of the core in accordance with the 3D model in a first CNC processing method.