| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an induction hardening method of a crankshaft that enables induction hardening of a shaft part and a fillet part in the crankshaft with a uniform hardening depth and reduces production cost of a high-frequency induction heating coil, and to provide the high-frequency induction heating coil. <P>SOLUTION: A first coil gap G1 and a second coil gap G2 were set so that a gap ratio G2/G1 becomes 1.5-3.0. by employing a heating conductor 4 whose cross-sectional shape is rectangular. As a result, production and adjustment of a high-frequency induction heating coil 1 are easy, and the production cost of the high-frequency induction heating coil 1 is significantly reduced. Furthermore, uniform raising of temperature of a pin part 2 and a fillet part 3 is possible, thereby enabling efficient induction hardening of parts in the crankshaft subjected to hardening with a uniform hardening depth. <P>COPYRIGHT: (C)2013,JPO&INPIT |
