| 摘要 |
PURPOSE:To reduce the production cost of a casting mold by using a slurry prepd. by incorporating an aq. silica sol as a binder for molding sand therein and a composite gelling agent consisting of a mixture of salts generated by a specific chemical reaction and forming the casting mold by casting. CONSTITUTION:The aq. silica sol is incorporated as the binder for the molding sand into the slurry to be used for molding by a casting system and the composite gelling agent consisting of the mixture composed of the various salts generated by the reaction of a strong base and strong acid and the reaction of the strong base and weak acid. A prescribed amt. of a surface active agent is added to the slurry for the purpose of reinforcing kneading property as necessary to faithfully transfer the detailed parts of a pattern. The aq. silica sol contg. 0.001-2.0% surface active agent is used as the binder for the slurry to be used for molding of a cumulative coating type and such slurry and molding sand are laminated and coated on a wax pattern. Prescribed IR radiation is used for curing thereof. The cost and stage for producing the casting are thereby reduced.
|
