| 摘要 |
PURPOSE:To mold economically a furan resin mold by utilizing reconditioned sand and to obtain a cast steel product having less defects by using sand which is limited in the quantity of ignition loss as face sand in molding of the above- mentioned mold. CONSTITUTION:The furan resin mold is molded by using the reconditioned sand of which the quantity of the ignition loss is <=0.7% as at least the face sand. The reconditioned sand of a low grade of which the quantity of the ignition loss exceeds 0.7% can be utilized as the back sand. The quantity of the casting defects to be generated is not effected if the molding sand of a high grade having <=0.7 quantity of the ignition loss is used as the face sand. The effective utilization of the reconditioned sand of the low grade is thus made possible and the higher economy is obtd. by using the molding sand having the quantity of the ignition loss different with the face sand and back sand.
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