| 摘要 |
PURPOSE:To obtain less current density and perform the smooth work of chamfering a work, by using a stationary electrode of linear or protrusive shape in its cross section and separating a machining face of the machining electrode from an edge part of the work as it goes away from the edge line of the work. CONSTITUTION:A machining face 4 of a cut edge part 35 in a stationary machining electrode 3 is formed by providing exposed portions without insulating coatings 43 at both sides of a cut edge 35a which is a cross line made by the peripheral surface of a large diameter part 31 and a plane in perpendicular to the center axis of the large diameter part 31. The shape of cross section of the machining face 4 cut by a plane in perpendicular to an inner circumferential edge line 5a of an inner circumferential edge part 2a in a work 1, to which the machining face 4 is placed at a face- to-face position, forms two sides at a right angle. If voltage is applied under this condition, the cut edge line 35a and the inner circumferential edge line 5a are placed in the nearest position, accordingly largest current density is provided near the inner circumferential edge line 5a with less current density in the inner circumferential edge part 2a according to the separation from that place, thus to perform the work of chamfering without a stepped part. Another protrusive edge part 37 and stepped edge part 36 can be similarly performed the machining work. |
