| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an induction hardening device capable of easily and surely hardening a portion close to an inner circumferential surface in a through hole or a hole whose inside diameter is relatively small to the desired hardness with excellent accuracy. SOLUTION: This induction hardening device 1 is provided with an energization tube 10 to be inserted in a through hole 6 of a previously restricted work 4 in a substantially concentric manner, and a high frequency power source 74 to be connected to one end thereof, the other end of the energization tube 10 is connected to the work 4, a cooling water W is fed between an inner circumferential surface of the through hole 6 and the energization tube 10, and in a hollow portion 10a of the energization tube 10, and induction heating and the energization heating are achieved on a portion close to the inner circumferential surface of the through hole 6 by the energization to the energization tube 10 and the work 4, and the portion close to the inner circumferential surface of the through hole 6 is hardened. A tip 41 of an optical fiber 40 passing through the hollow portion 10a of the energization tube 10 is brought close to the inner circumferential surface of the through hole 6, the other end of the optical fiber 40 is led outside the energization tube 10, and the light signal from the optical fiber 40 is outputted as the electric signal by a light/electric converting means 60 to measure the heating temperature close to the inner circumferential surface of the through hole 6.</p> |
