| 摘要 |
A high frequency heating coil is provided in which a main body part (11) of a workpiece (W) is surrounded by a loop part (13) of the high frequency heating coil (I) and subjected to high frequency heating, and a flange part (12) of the workpiece (W) is sandwiched by a pair of lead-out parts (14, 15) of the high frequency heating coil (I) and subjected to high frequency heating. The first and second lead-out parts (14, 15) of the high frequency heating coil (I) oppose the flange part (12) of the workpiece (W), and since the first and second lead-out parts (14, 15) are disposed so as to be offset in the axial direction of the workpiece (W), it is possible to prevent eddy currents in opposite directions to each other from being generated in the flange part (12) of the workpiece (W) by means of high frequency current passing through the first and second lead-out parts (14, 15), and to prevent the flange part (12) of the workpiece (W) from being more difficult to heat compared with the main body part (11), thereby providing a high frequency heating coil that can uniformly heat a pipe-shaped workpiece in which a flange part projecting outward in the radial direction from an outer peripheral face of a main body part having a closed cross section is formed along the axial direction. |
