Cutting method and apparatus and rib electrode for electric discharge machining

摘要

An object of the present invention is to provide a cutting method and apparatus and a rib electrode for electric discharge machining which can cut a rib portion of a workpiece efficiently and accurately. For this purpose, a cutting tool 11 having cutting edges 23 a, 23 b extending in parallel or extending along two straight lines diverging toward the forward end in the same plane is prepared. The cutting tool 11 is arranged with respect to a workpiece W such that the two cutting edges 23 a, 23 b engage with the two opposed side surfaces of the rib portion R of the workpiece W. The cutting tool 11 is moved relative to the workpiece W along a desired machining path, to thereby cut the two side surfaces of the rib portion R of the workpiece W at one time.