| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a hollow core, by which a high quality hollow core product can be manufactured without roughing the surface of the hollow core and without causing mold cavities and burrs in the hollow core. SOLUTION: Metal molds 1a, 1b are provided at the position where a sand charging port 3 of a mold hole 2 faces downward. A sand tank 5 is arranged below the metal molds 1a, 1b such that the sand supply port 4 faces upward and can be connected to the sand charging port 3 of the metal molds 1a, 1b. From this state, the sands S contained within the sand tank 5 are gravitationally supplied to the mold hole 2 of the metal molds 1a, 1b via the sand charging port 3 from the sand supply port 4, while the metal molds 1a, 1b and the sand tank 5 are being inverted such that the sand charging port 3 faces upward and the sand supply port 4 faces downward. After the sands in contact with the wall of the mold hole 2 have been hardened by thermal setting, the unhardened sands S within the mold hole 2 are gravitationally discharged from the sand charging port 3 into the sand tank 5 via the sand supply port 4, while the metal molds 1a, 1b and the sand tank 5 are being inverted to the former positions. COPYRIGHT: (C)2004,JPO
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