| 摘要 |
PURPOSE:To prevent leakage of a molten metal and failure in the stage of charging the molten metal by increasing the hardness in the joint part of a casting mold while performing alternately feeding of molding sand and squeezing by a compression plate plural times in the flask of the casting mold mounted with a match plate on which a pattern is attached. CONSTITUTION:A match plate 2 on which a pattern 1 is attached is mounted in a flask 3 of a casting mold and molding sand 4a is fed into such flask. The sand 4a is compressed with a compression plate 5. The sand 4b is again fed therein and is compressed with the plate 5. The second sand 4b flows to the part of the previous sand 4a having small strength thereby providing the strength uniformly over the entire part uniform. As the number of repetitions is larger, the degree of compaction is more uniform. Since the sand is uniformly compacted, the leakage of a molten metal and failure are prevented and the molding of a larger-sized casting mold is made possible. |
