Patent ID: 9534267
Date: 2017-01-03
CPC Classifications: C21D,H05B,Y02P

Claim:
1. An induction hardening apparatus, comprising: heating coils disposed around a treatment object having a peripheral surface as a treatment target portion; the treatment object and the heating coils being relatively moved along a circumferential direction of the treatment target portion of the treatment object based on rotational movement of at least one of the treatment object and each of the heating coils; the treatment target portion of the treatment object being inductively heated; a stepped peripheral surface with a concave portion aligned along a circumferential direction and a convex portion aligned along a circumferential direction of the treatment object being determined as the treatment target portion; and the heating coils comprising: at least one of the heating coils comprising a heating conductor portion having a zigzag shape in which a bent portion that is aligned along a circumferential direction of the rotation and is opened to one side in an axial direction of the rotation and a bent portion that is arranged along a circumferential direction of the rotation and is opened to the other side in the axial direction are alternately continuously arranged side by side along the circumferential direction, wherein the first heating coil and the second heating coil are spaced from each other and adjacently arranged in the circumferential direction of the treatment object.