Provided is a mold manufacturing method with which the requirement of a wide variety of products in a small lot can be satisfied. A cutting step includes forming, through cutting, mold matching surfaces in respective upper and lower molds and forming, through cutting, cavities C1 and C2 in the respective upper and lower molds with the mold matching surfaces being references. A mold matching step includes: measuring at least three points PU1 to 3 that are not located on a same straight line and that are located on the mold matching surface of the lower mold placed on a placement surface; causing recognition of Z coordinates of these respective points; measuring at least three points PL1 to 3 that are not located on a same straight line and that are located on the mold matching surface of the upper mold gripped by a gripping arm; causing recognition of Z coordinates of these respective points; and subsequently performing mold matching with the mold matching surfaces SmU and SmL of the upper and lower molds being oriented to be kept parallel to each other.

Provided is a mold manufacturing method with which the requirement of a wide variety of products in a small lot can be satisfied. A cutting step includes forming, through cutting, mold matching surfaces in respective upper and lower molds and forming, through cutting, cavities C1 and C2 in the respective upper and lower molds with the mold matching surfaces being references. A mold matching step includes: measuring at least three points PU1 to 3 that are not located on a same straight line and that are located on the mold matching surface of the lower mold placed on a placement surface; causing recognition of Z coordinates of these respective points; measuring at least three points PL1 to 3 that are not located on a same straight line and that are located on the mold matching surface of the upper mold gripped by a gripping arm; causing recognition of Z coordinates of these respective points; and subsequently performing mold matching with the mold matching surfaces SmU and SmL of the upper and lower molds being oriented to be kept parallel to each other.

A core quality estimation system that estimates quality of a core to be formed by filling a mold with kneaded sand produced by kneading in a kneading tank and heating the kneaded sand includes a computer that executes operations of acquiring mold temperature information of the mold, acquiring environmental information regarding a surrounding environment in which the core is formed, and estimating the quality of the core based on the mold temperature information and the environmental information.

A core quality estimation system that estimates quality of a core to be formed by filling a mold with kneaded sand produced by kneading in a kneading tank and heating the kneaded sand includes a computer that executes operations of acquiring mold temperature information of the mold, acquiring environmental information regarding a surrounding environment in which the core is formed, and estimating the quality of the core based on the mold temperature information and the environmental information.

Provided is a mold manufacturing method with which the requirement of a wide variety of products in a small lot can be satisfied. A cutting step includes forming, through cutting, mold matching surfaces in respective upper and lower molds and forming, through cutting, cavities C1 and C2 in the respective upper and lower molds with the mold matching surfaces being references. A mold matching step includes: measuring at least three points PU1 to 3 that are not located on a same straight line and that are located on the mold matching surface of the lower mold placed on a placement surface; causing recognition of Z coordinates of these respective points; measuring at least three points PL1 to 3 that are not located on a same straight line and that are located on the mold matching surface of the upper mold gripped by a gripping arm; causing recognition of Z coordinates of these respective points; and subsequently performing mold matching with the mold matching surfaces SmU and SmL of the upper and lower molds being oriented to be kept parallel to each other.

Provided is a mold manufacturing method with which the requirement of a wide variety of products in a small lot can be satisfied. A cutting step includes forming, through cutting, mold matching surfaces in respective upper and lower molds and forming, through cutting, cavities C1 and C2 in the respective upper and lower molds with the mold matching surfaces being references. A mold matching step includes: measuring at least three points PU1 to 3 that are not located on a same straight line and that are located on the mold matching surface of the lower mold placed on a placement surface; causing recognition of Z coordinates of these respective points; measuring at least three points PL1 to 3 that are not located on a same straight line and that are located on the mold matching surface of the upper mold gripped by a gripping arm; causing recognition of Z coordinates of these respective points; and subsequently performing mold matching with the mold matching surfaces SmU and SmL of the upper and lower molds being oriented to be kept parallel to each other.

A foundry sand reserving method includes reserving, acquiring, setting, and controlling. The reserving includes reserving foundry sand capable of being supplied to a foundry sand related device in at least one reserving unit. The acquiring includes acquiring a reserve amount of the foundry sand in at least one reserving unit, a charge amount of the foundry sand to the reserving unit, and a supply amount of the foundry sand to a foundry sand related device. The setting includes setting a threshold for the reserve amount based on a predetermined aging time of the foundry sand and the charge amount and the supply amount acquired in the acquisition step. The controlling includes controlling at least one selected from the group consisting of the charge amount and the supply amount based on the reserve amount acquired in the acquiring step and the threshold set in the setting step.