| 摘要 |
PROBLEM TO BE SOLVED: To provide a transverse type induction heating apparatus which can prevent the excessive temperature rise of the surface of a plate to be rolled by almost uniformly heating the surface of the plate and the middle of the thickness of the plate at the central portion of the width of the plate to be rolled. SOLUTION: In the transverse type induction heating apparatus for heating the plate 1 to be rolled by means of inductors 2, 3 to which electric power is supplied from an AC power source 4, the inductors 2, 3 are arranged on the center line of the width of the plate 1 to be rolled such that the width of the iron cores of the inductors 2, 3 in the direction of the width of the plate to be rolled is smaller than the width of the plate 1 to be rolled. The heating frequency of the AC power source 4 is set such that the depthδof current penetration defined by the following expression (1):δ=äρ/(μ×f×π)}<SP>1/2</SP>, satisfies the following expression (2): 1.0<äcosh(tw/δ)+cos(tw/δ)}/2<1.03, whereinδ(m) is a depth of current penetration,ρ(Ω/m) is a specific resistance of the plate 1 to be rolled,μ(H/m) is a permeability of the plate 1 to be rolled, f(Hz) is a heating frequency of the AC power source 4,πis a ratio of the circumference of a circle to its diameter, and tw(m) is a thickness of the plate 1 to be rolled. COPYRIGHT: (C)2006,JPO&NCIPI
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