METHOD FOR CONTROLLING VACUUM ARC DESCALING BY MAGNETIC FIELD AND DEVICE THEREFOR

摘要

PURPOSE: To make surface roughness fine by executing vacuum arc descaling by a magnetic field in which an arc is oscillated by acting an alternating field having the component of the line of magnetic force which is orthogonally crossed to an arc on the arc at the time of treating the surface of metal by discharging the vacuum arc on a material to be treated. ;CONSTITUTION: The anode electrodes 2 are provided as an electrode pair, the material 1 to be treated is connected to the cathode and a discharge arc is formed between the anode electrode 2 of the positive pole and the material 1 to be treated of the cathode. Arc shield plates 4-1, 4-2 are interposed between magnetic field generating coils 3-1, 3-2 provided on the anode. Since the magnetic field which is orthogonally crossed to an arc current is present, electromagnetic force acts on the arc in the direction of a vector product of the arc current and magnetic field and the arc is moved. Since the magnetic field is the alternating field, the force which acts on the arc is reversed at a timewise period and a reciprocating movement is inducted. The arc spot is moved, so the arc spot can not locally stay at the cathode on the material to be treated and deep molten pool is not made. In this way, local excess melting is prevented and the surface roughness is made fine and uniform.;COPYRIGHT: (C)1995,JPO