| 摘要 |
PROBLEM TO BE SOLVED: To provide a green sand core, the method and the device for molding it and the cast member obtained by them by which characteristics such as the strength and gas permeability of a casting mold which are necessary in each part are secured even when the core has a complicated shape and large difference between a thick part and a thin part, the quality of cast member after casting is improved by improving working environment and also securing gas permeability by omitting a coating stage, machinability is improved by reducing the generation of carburization on the surface of castings after casting cast steel or the like and furthermore the maintenance and management of equipment are easy and the core and the cast member are manufactured at a low cost and high productivity. SOLUTION: The green sand core is formed by compression with many compressing dies from the horizontal direction after blowing green sand consisting of ceramic artificial globular particles, essentially activated clay and water into preliminary cavity from the upper side. The molded green sand core is submitted to casting without performing coating and the hardness of the casting surface of an obtained cast member which is brought into contact with the green sand core is taken as≤HV 455. COPYRIGHT: (C)2004,JPO
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