To provide an apparatus and a method for tempering with a high-frequency induction-heating, wherein with respect to the whole heat-hardening layer to be formed in a workpiece having a cylindrical surface of the different diameters on the outer diameter surface, the tempering performance is improved by heating into the temperature range needed to the tempering.
As for the workpiece having the cylindrical surface with the different diameters on the outer diameter surface, when the hardened layer S at a stepped part 39 or at the neighborhood of the stepped part on the outer diameter surface of the small diameter part, is tempered, the high-frequency current is impressed to a first induction-heating coil 35 surrounding the small diameter part and a second induction-heating coil 38 to generate alternating current magnetic field in the first induction-heating coil 35. Thus, the alternating current is caused to flow into the second induction-heating coil 38 surrounding the stepped part 39 or the neighborhood of the stepped part to generate the alternating current magnetic field in the second induction-heating coil 38.
YAMAGUCHI MASAMI
ODA KAZUO
KOBAYASHI ATSUSHI
YASUTAKE HIDEHIRO
NETUREN CO LTD
| JPS5923813A | 1984-02-07 | |||
| JPS6487721A | 1989-03-31 | |||
| JPS5954555U | 1984-04-10 | |||
| JP2008150661A | 2008-07-03 | |||
| JPH01136156U | 1989-09-18 |
Yoshiyuki Shiraishi
Kunihiko Shiromura
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