| 摘要 |
<p>PURPOSE:To heat the entire part of a material to be heated to the temp. uniform over the entire part thereof by supporting the bottom end of the material to be heated by a metallic material and subjecting this metallic material to induction heating as well simultaneously with the material to be heated at the time of subjecting the material to be heated to the induction heating in a chamber made of a refractory heat insulating material having a heating coil. CONSTITUTION:The material 1 to be heated is mounted in a supporting frame 4 having the layer consisting of the refractory heat insulating material and the induction heating coil 3 on the inside surface and AC current is passed to the coil 2 to heat the metallic material 1 by the induced current. The metallic material 1 is mounted on the metallic piece 11 in this case and an inert gas is introduced from a gas supply port 29 provided to the top of the frame 4 into the frame 4. Since the metallic piece 11 supporting the material 1 is heated simultaneously with said material by the induced current, the cooling of the material 1 by the metallic piece 11 at the base thereof is obviated and the surface oxidation is prevented by the inert gaseous 21 atmosphere. The uniform heating is thus executed.</p> |
