Direct resistance heating apparatus and a direct resistance heating method

摘要

A direct resistance heating apparatus (10, 20, 40, 50) comprising: a pair of electrodes (13, 43, 53a, 53b) adapted to be electrically coupled to a power supply unit (1), the torque of electrodes (13, 43, 53a, 53b) comprising a first electrode (11, 21, 41, 51a, 51b) and a second electrode (12, 22, 42, 52a, 52b); and a movement mechanism (15, 25, 44, 45, 56a, 56b) configured to move at least one of the first electrode (11, 21, 41, 51a, 51b) and the second electrode (12, 22, 42, 52a , 52b) to change a distance between the first electrode (11, 21, 41, 51a, 51b) and the second electrode (12, 22, 42, 52a, 52b), characterized in that the mechanism (15, 25, 44, 45 , 56a, 56b) of movement moves the at least one of the first electrode (11, 21, 41, 51a, 51b) and the second electrode (12, 22, 42, 52a, 52b) with the first electrode (11, 21, 41, 51a, 51b) and the second electrode (12, 22, 42, 52a, 52b) both contacting a workpiece (W) and with an electric current being applied from the power supply unit (1) to the part working (W) through the pair of electrodes (13, 43, 53a, 53b), where the at least one of the first electrode (11, 21, 41, 51a, 51b) and the second electrode (12, 22, 42, 52a, 52b) is configured to roll or slide over the heating target region of the workpiece (W) while contacting the heating target region.