| 摘要 |
<p>PURPOSE:To prolong a lifetime of a high frequency induction heating coil for heating a workpiece consisting of a small-diameter portion, a shoulder portion and a large-diameter portion. CONSTITUTION:A high frequency induction heating coil 100 is provided with a first coil 100A for heating a small-diameter portion and a second coil 100B for heating the small-diameter portion, a shoulder portion and a large-diameter portion. The first coil 100A is connected in series to the second coil 100B, thus obtaining a 2-turn coil. Consequently, inductance of the coil can be increased.</p> |
