| 摘要 |
The present invention provides an electrical discharge machining method that machines throughholes (22) in a workpiece (20) by using an electric discharge machine (100) having a cylindrical pipe electrode (10), in order to solve the issue of the difficulty of machining a tapered section into a variety of shapes, such as forming, e.g., a rounded section having a smaller radius of curvature than the electrode diameter of the pipe electrode, in the inside wall surface of the tapered section. The electrical discharge machining method is configured so as to include: a step in which a pipe electrode (22) is arranged such that the axis line (LO) of the pipe electrode (10) faces the depth direction of the throughholes (22), the pipe electrode (22) is moved relative to the workpiece (20), and a sloped section (24) is formed; a step in which a straight section (23) connected to the sloped section (24) is formed; and a step in which the pipe electrode (10) is arranged such that the axis line (LO) is vertical relative to the inside wall surface (243) of the sloped section (24), the pipe electrode (22) is moved relative to the workpiece (20), and the inside wall surface (243) is machined. |
