| 摘要 |
<p>PURPOSE:To efficiently produce a casting having excellent quality with non- metal or metal by forming a crucible charging casting material by graphite or carbon in the titled apparatus for precision casting of metallic dental prosthesis. CONSTITUTION:A casting part 1 constitutes a mold part 5 composing of a cylindrical heating room 2, the crucible 3 and a mold 4, and a mold table 15, which lays the mold 4 and moves vertically to contact as pushing with the crucible 3 by a mechanism 13. The heating room 2 winds a high frequency induction heating coil 8 at the outer circumference of refractory cylindrical body 6 and arranges reducing pressure or Ar gas blowing guide pipe 10 and Ar gas or air pressurized guide pipe 11. In this high frequency precision casting apparatus, the crucible is formed by the graphite or the carbon and heated by induction heating to melt the casting material 25 in the crucible 3. Further, in case of being afraid of eroding the crucible 3 by gas generated from molten material, such as glass, etc., refractory coating 26, such as alumina, etc., is formed as supplying on the inner wall of crucible 3.</p> |
