| 摘要 |
PURPOSE:To manufacture a thin cast product without casting defect of misrun, blow hole, etc., by making the pressure to be reduced in a cavity at a pressure reducing suction side larger than the pressure to be reduced in a cavity at sprue side. CONSTITUTION:A feed head 9 and/or a run-off part are arranged neat the last filling part of molten metal 3 in a cavity 2 for product in a permeable mold 1. At least one or more of the pressure reducing suction holes 11 are arranged near the feeder head 9 and/or the run-off part in the mold 1. Interval between the pressure reducing suction hole 11 and at least one or more of the feeder head and/or the run-off part and hollow core 8 print is connected with a suction member 10 having the permeability higher than the permeable mold 1. In such a way, the pressure to be reduced in the cavity 2 at the pressure reducing suction side is made larger than the pressure to be reduced in the cavity at the sprue side. By this method, without disturbing the flow of molten metal, the fluidity of molten metal is improved and the generating gas at the time of pouring the molten metal can effectively be removed. |
