| 摘要 |
PURPOSE:To pack molding sand having a high packing density around a foamed resin consumable pattern and to permit production of a casting having excellent shape and dimensional accuracy by placing a cylinder having many small holes in a molding flask and disposing the consumable pattern therein, then packing the non-binding sand into the space between the molding flask and the cylindrical body while oscillating the entire part. CONSTITUTION:The foamed resin consumable pattern 4 is disposed into the cylindrical body 6 having the many small holes 5 in the molding flask 2 imposed on an oscillation table 1. While the table 1 is oscillated, the non-binding molding sand 3 is charged between the molding flask 3 and the cylindrical body 6. The molding sand is passed through the small holes 5 into the cylindrical body 6 by the oscillation to fill the pattern 4. The molding sand is tightly packed around the pattern 4 by the oscillation. The mold strength is improved by the improved packing density over the entire part of the mold. The casting having the excellent size and shape accuracy is thus easily obtd. |
