Patent ID: 9689049
Date: 2017-06-27
CPC Classifications: C21D,H05B

Claim:
1. An electric heating device for applying an electric current to a plate-like workpiece having two largest flat surfaces parallel to each other to heat the workpiece, comprising: a pair of electrodes for applying the electric current to the workpiece, the pair of electrodes being arranged at a predetermined interval in an electric current direction in which the electric current is applied to the workpiece; and a pair of clamps for fixing the workpiece directly, wherein each of the electrodes extends along the two largest flat surfaces of the workpiece in a direction perpendicular to the electric current direction while maintaining a constant length in the electric current direction, and sandwiches the workpiece therein so as to press the two largest flat surfaces of the workpiece, wherein each of the clamps is arranged in a vicinity of each of the electrodes, and sandwiches a part of the workpiece other than a part to be heated therein so as to press the two largest flat surfaces of the workpiece, each of the clamps fixing the workpiece outside of, in the electric current direction, the part of the workpiece sandwiched by the electrodes, wherein a pressure at which each of the clamps sandwiches the workpiece therein is higher than a pressure at which each of the electrodes sandwiches the workpiece therein, and wherein the electrodes and the clamps are provided separately and in a non-connected state from each other.