C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
327/15
C21D 9/60 (2006.01)
Patent
CA 1295376
ABSTRACT OF THE DISCLOSURE An induction heating apparatus for utilizing electromagnetic induction to heat a workpiece. The apparatus includes a pair of heating coil units disposed in spaced-parallel relation to permit transportation of the workpiece between the heating coil units. Each of the heating coil units includes a main heating coil and an auxiliary heating coil disposed at a position adjacent to the main heating coil. The main heating coil has a plurality of spaced-parallel transverse conductors connected in series and produces magnetic field crossing the workpiece, causing heating when supplied with a high- or intermediate-frequency alternating current. The auxiliary heating coil includes a pair of series connected longitudinal conductors placed at positions facing to the workpiece at a small distance inside from the respective opposite side edges of the workpiece. The auxiliary heating coil is supplied with a high- or intermediate- frequency alternating current to heat the workpiece in a manner to compensate the temperature ununiformity provided by the main heating coil so as to provide good temperature Uniformity over the full width of the workpiece. Each of the main heating coils is divided into a plurality of Portions arranged alternatively in a line with the auxiliary heating coil. In another aspect, the first and second longitudinal conductors of each of the auxiliary heating coils are inclined at an angle with respect to the direction of transportation of the workpiece.
553367
Kabushiki Kaisha Meidensha
Robic
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