| 摘要 |
PURPOSE:To widen an area of the machined work, hasten its machining speed and improve its machining accuracy in an electric discharge machining, by performing its machining work while removing a square pillar-shaped machining electrode diagonally upward from the bottom of a hole and forming a tapered pattern. CONSTITUTION:A square pillar-shaped machining electrode is prepared to form a square hole 12 in a work 11. Then to form a tapered pattern expanded upward in said square hole 12 by using a machining electrode 10, the machining electrode 10 is moved upward while being laterally shifted in such a manner as to be removed diagonally upward from the square hole 12. While the machining operation of electric discharge by moving the machining electrode 10 diagonally upward from a bottom face 12b of the square hole 12 is applied to the machining along a different side wall and ridgeline, to obtain a desired tapered forming. |
