| 摘要 |
PURPOSE:To suck a molten metal into the cavity of a casting mold and to produce a casting having excellent quality by covering each air-permeable sand mold with a sealing capasule and inserting the top end of a stalk immersed into the molten metal in a ladle into the inlet of the casting cavity of the sand mold then evacuating the inside of the sealing cover. CONSTITUTION:The plural sand molds 1 each molded of a raw material consisting of silica sand, zircon sand, etc. and having air permeability are successively moved from the left to the right. The cap 10 of the ladle 7 attached with the stalk 11 is moved upward by a hydraulic lifting device 14 to fit the upper top end of the stalk 11 into the inlet 4 of the casting cavity 3 in the mold 1 when the mold 1 moves to the position above the ladle 7 below the mold. The mold 1 is hermetically closed by the sealing capsule and the inside of the capsule is evacuated by a vacuum device. The air in the cavity 3 is evacuated through the mold 1 and the molten metal 9 in the ladle 7 is sucked into the cavity and is cast. Since the bottom end of the stalk 11 is inserted deep into the ladle 7, the casting having excellent quality without slag and blowhole is cast without suction of molten slag and air. |
