INDUCTION HEATING COIL AND INDUCTION HARDENING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an induction heating coil which can uniformly heat an inner wall of this bowl-shaped hollow part even if the bowl-shaped hollow part formed in a heating object is small. SOLUTION: An induction heating coil 20 having a first conductor part 30 wound along a side wall 14 of a hollow part 12 and a second conductor part 40 extending along a bottom wall 16 of the hollow part 12 by continuing from this first conductor part 30, is manufactured. The first conductor part 30 is doubly wound, and a boundary line 36 between a first winding 32 and a second winding 34 is inclined by an angle in a range of 75 deg. to 82 deg. to a rotary shaft 42.