| 摘要 |
PURPOSE:To obtain a mold with reduced consumption of casting sand, improved compactness of sand and permeability by molding casting sand mixed with a water-soluble binder in a patterned molding flask and drying to harden after applying the water-soluble binder on the surface of the sand mold. CONSTITUTION:A patterned plate 1 is placed on a molding flask 2 and casting sand S mixed with least necessary amt. of a water-soluble binder is packed in the flask to a specified density. A base plate 5 is laid on the flask, then the flask is upset to release the sand mold. The water-soluble binder is sprayed uniformly on the surface of the released sand mold. Hot pressurized air is supplied from above and allowed to permeate through the sand mold to harden the sand mold. By this way, the sand is compacted uniformly and the permeability is sufficient due to the samll amt. of the binder used in the inside of the sand mold. Moreover, sufficient strength of the surface of the sand mold is obtd. by the spray of the binder on the surface of the sand mold. |
