| 摘要 |
PURPOSE:To obtain a casting product having excellent quality with vacuum casting by covering the whole face except lower face of green san mold or molding flask with synthetic resin-made covering bag, arranging sucking holes to the covering bag, integrally arranging a sucking cap with the covering bag and pouring molten metal while sucking the air. CONSTITUTION:The sand mold is covered with the synthetic resin-made covering bag 11 over the whole face except the lower face, one group of plural sucking holes 12 are arranged in the covering bag 11 and the sucking cap 13 surrounding outer peripheray of the sucking hole 12 group is integrally arranged with the covering bag 11 or the sand mold is covered with a simply constituted bag 11 integrally arranged with a sucking pipe 14. By this method, the vacuum casting performed by pouring the molten metal while exhausting air among the particles in the molding sand with a vacuum pump, can be executed. |
