| 摘要 |
A flaskless sand mold is formed in vertically aligned, sand-filled cope and drag flasks having a pattern board arranged between them so that pattern portions mounted upon the board extend upwardly into the cope and downwardly into the drag. The sand in the drag flask is supported upon a vertically guided platen which covers the bottom of the drag flask, and the cope is covered with a squeeze plate. The sand fillings are compressed against the pattern board and the pattern portions by the platen and squeeze plate to form compacted cope and drag sand molds with aligned cavities. Then the platen, supporting the drag sand mold, is lowered a short distance while the drag flask is held immovably against the cope flask. Thereafter, while the platen, with the drag sand mold, continues to lower, the drag frame is simultaneously lowered into a rest position upon a track-like support. When the drag sand mold reaches a position completely below the bottom of the drag flask, the drag flask is laterally moved out of the way, upon its support, along with the pattern board, and the platen is elevated until the drag sand mold upper surface engages the lower surface of the cope sand mold to form a closed flaskless sand mold with a casting cavity. Next, the closed sand mold is lowered until the cope sand mold is beneath the cope flask, and the sand mold is then moved transversely to a different location for casting metal.
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