| 摘要 |
PURPOSE:To facilitate removal of a core and to obtain a mold for investment casting, which is suitable to large size casting, by filling kneaded material of aggregate and binder after forming coating layer of slurry to a core mold and curing by dielectric heating. CONSTITUTION:The slurry is poured in the core mold 10 and after suitable time, the slurry is discharged to form the coating layer 12 of the slurry. The kneaded material 14 of the aggregate and the binder is field into the core mold 10 and by dielectric heating from AC power source 18, the layer 18 and the kneaded material 14 are dried and cured. Next, the core 20 having the coating layer 12 is taken out from the core mold 10 and after forming wax layer 22 on the surface of the layer 12, the core is fixed in a die 24. An expendable pattern material is injected into the die 24, to form the expendable pattern 26. The slurry and granular stucco are alternately coated on the expendable pattern 26, to form refractory layer 28. After drying, the expendable pattern 26 is dewaxed, and the core 20 and the refractory layer 28 are burnt at the same time, to form a ceramic shell mold 30. |
