| 摘要 |
PROBLEM TO BE SOLVED: To save the necessary quantity of molding sand by executing casting with a self-hardening mold, taking out a cast product, scraping out the deteriorated self-hardening sand part, laying a metallic flask having a cavity of the remained sand of a similar shape on a pattern plate, filling up the self-hardening sand in a space and manufacturing a mold. SOLUTION: The self-hardening and 2 is filled up between the pattern plate 3 and the metallic flask 1, and hardened, and the casting is executed and the cast product is taken out. The deteriorated self-curing sand with the casting heat is scraped out. A part of the self-hardening and 2 is remained in the metallic flask 1. At the time of laying this metallic flask 1 on the pattern plate 3, the sprue 5 is formed in the interval between the pattern plate 3 and the self-hardening sand 2. The pattern plate 3 is ascended and press-fixed to the lower surface of a frame, and the self-hardening sand 2 is supplied from a sand supplying hole of the frame and filled up into the space 5. When the self- hardening sand 2 hardens, the pattern plate 3 is taken off to form the mold and this operation is repeated. The molding sand quantity is saved by the quantity of the self-hardening sand 2 remained under hardened condition. |
