| 摘要 |
PURPOSE:To cast plural products while consuming patterns and to reduce the cost of patterns and man-hours for casting by connecting the consumable patterns consisting of one or several pieces to each other, embedding the same in a casting mold and charging a molten metal into the mold from one end of a runner. CONSTITUTION:Each consumable pattern 3 is formed with a runner 4 in an upper horizontal direction, is provided with a gate in the part below the runner 4 and is formed with a product part 6 below the gate. The runners 4 are linearly connected to each other and a consumable pattern 7 for a sprue and likewise a consumable plug 8 are provided. Such patterns are embedded in a non-bindable granular material. When the inside of the mold is evacuated by a blower 13, the granular material is densely compacted to have the strength to withstand the molten metal pressure. The consumable patterns are evaporated by the molten metal and the gas generated by the evaporation is sucked through the granular material into an evacuation chamber 10. Plural products are thus cast by one time of charging and since there is no need for removing the patterns, there is no need for taking draft and the position of a parting line into consideration.
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