| 摘要 |
PURPOSE:To heat and harden uniformly a casting mold in a short time by applying a mold releasing material and subsequently a refractory paint to a mold forming surface of a pattern, and thereafter, packing a wolding sand, and hardening and drying simultaneously as one body the mold and the refractory paint by a high frequency dielectric heating. CONSTITUTION:A mold releasing material 5 is applied to a mold forming surface of a pattern 4, also a refractory paint 6 is applied on it, and thereafter, a molding sand 7 containing a binder is packed in it. Subsequently, the pattern 4 is installed between parallel plate electrodes 3, 3 connected to a high frequency power source 1 by a conductor 2 as it is, and by irradiating a high frequency electric wave of abou 3-100MHz, the refractory paint 6 and the molding sand 7 are brought to a dielectric heating simultaneously as one body, and they are hardened and dried. In this regard, the paint 6 is bound strongly to the mold 7, and peeled off from the pattern 4 due to the mold releasing material 5. In this way, the mold can be heated and hardened uniformly is a short time, and the dimension accuracy of the casting is improved. It is applied to a pattern using a lumber of this method, too.
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