| 摘要 |
The invention concerns an apparatus (1) for inductively heating an electrically conductive workpiece (2) in the form of a closed ring, the apparatus having a U-shaped magnet core (3) with two legs (4), with an electrically conducting coil (5) arranged on at least one leg (4) of the U-shaped magnet core (3) and connectable with an alternating current source, and a magnet yoke (6) which is spaced from at least one freestanding end of a leg (4) of the U-shaped magnet core (3), so that a closed magnetic circuit with at least one air gap (7) is formed, the height of the air gap (7) being so chosen that the electrically conductive workpiece (2) can be moved in a non-contacting manner into the air gap (7). The invention further concerns a method for conductively heating an electrically conductive workpiece (2) made in the shape of a closed ring, the heating being performed using an apparatus of the invention with a workpiece (2) being moved without contact into an air gap (7) so that the workpiece (2) surrounds the air gap (7), and so that a totally enclosed opening (10) of the workpiece (2) is located at least partially in the air gap (7), the coil (5) of the apparatus (1) being supplied with an alternating current.
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