| 摘要 |
PROBLEM TO BE SOLVED: To provide a method with which a mold using no pattern plate and having small amount of binder and little deformation, can be molded. SOLUTION: This method is contained of a laminating process for thinly laminating the sand; a process for manufacturing the thin sand laminated body by drawing the outer shape of an one thin piece among many thin pieces generated when slicing a casting to be produced by pouring gas hardening agent with a pouring means, and pouring the gas hardening agent to the outer peripheral part of the laminated sand, too; a process for manufacturing a three-dimensional sand laminated material 7 composed of many sand laminated bodies by repeating the above processes to the other thin pieces, too, among many thin pieces; processes 5, 5a for hardening the gas hardening agent by passing the hardening gas through this sand laminated material; and a process for removing the sand at the outside in a portion surrounded with the gas hardening agent in the sand laminated material. In this way, the sand mold having a necessary cavity for casting can be molded.
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