| 摘要 |
PURPOSE:To satisfy all casting conditions and to obtain good a casting by embedding a lost wax pattern into non-cohesive molding material in a flask, molding by shaking the flask, covering the upper surface of flask with flexible sheet material, reducing the pressure from the lower part of flask during pouring of molten metal, sucking the air from the upper part and casting under turbulent air. CONSTITUTION:The molding with the non-cohesive molding material perfectly prevents mold collapse at the time of pouring the molten metal and deformation of the pattern by mechanically shaking the flask to raise the packing density of the molding material. Further, at the time of pouring the molten metal, the whole upper surface except sprue in the flask is tightly closed with the flexible sheet material and on the other hand, the upper opening part as adjustable to quantity of air flow to make the semi- close type of the flask constitution, and by applying the reduced pressure from the lower part of flask, the air flow is developed from the opening part to out of the flask through the inner part of flask. Then, as the pouring is executed under the turbulent air, the gas generated at the time of pouring is exhausted by the air flow, and further, as the residual carbon is oxidized, burnt and gasified by the air flow, and exhausted, the good casting without developing the carbon fault can be obtd. |
