| 摘要 |
PURPOSE:To prevent blow holes and to produce a high-quality product by discretely sucking the casting mold gas and core gas generated at the time of pouring to the casting mold of a green sand mold and allowing the discrete adjustment of the suction pressures of the casting mold gas and the core gas. CONSTITUTION:The front surface of the upper casting mold 4 excluding a runner 7 and the front surface of an upper flask 2 are covered with a suction pad 10. The molten metal is poured from the runner 7 to fill a hollow part 6 for the product. The gas is generated from the molten metal and the casting mold gas is generated from the casting mold. The core gas is generated from the core. These gases are forcibly sucked via the suction pad 10. The core gas is sucked through the hollow part 8 and a vent hole 9 to the block A of the pad 10. The molten metal gas and the casting mold gas are sucked from the front surface of the upper casting mold 4 into blocks B to E. Since the volume of the core gas is large, a regulating valve 12 is automatically controlled in such a manner that the suction force of the block A increases. The blow holes are prevented in this way and the need for a feeder and flow off is eliminated. |
