| 摘要 |
<p>PURPOSE:To prevent the lowering of brightness in a work executing non- oxidative induction hardening even if a little quantity of oxygen remains in a chamber. CONSTITUTION:The work W disposed in the chamber 30 filling up the non- oxidative gas G is heated with an induction heating coil 50, and after red-heating the work W, or after lapse of the prescribed time from start of the heating, reducing gas (g) is introduced into the chamber 30.</p> |
