MOLD FOR WAX MOLDED PRODUCTS FOR PRECISION CASTING AND MOLDING METHOD

摘要

PURPOSE: To reduce the molding defects of wax molded products and improve the yield of molding by setting the sectional area of the flow passages of auxiliary runners relatively smaller than the sectional area of the flow passage of a main runner. ;CONSTITUTION: The front end of an injection nozzle 6 is brought into tight contact with the sprue part 12 of the mold 11 and molten wax 2 is injected and poured into the mold 11. The wax 2 is admitted into the main runner 13 directly coupled to the sprue part 12 by the injection pressure and the exposed wax 2A is fed into a wax stagnating part 15 connected to the front end of the main runner 13. At this time, the exposed wax 2A which is half solidified hardly flows into the auxiliary runners 14 and is guided up to the front end of the main runner 13 when the sectional area of the flow passages of the auxiliary runners 14 is set smaller than the sectional area of the main runner 13. In succession, the non-exposed wax 2B is run and filled into the auxiliary runners 14 and a cavity 16 when the non-exposed wax 2B of a molten state is filled. The wax molded products formed in such a manner are taken out of the mold 11 and are supplied to the ensuing stages of precision casting.;COPYRIGHT: (C)1996,JPO