| 摘要 |
PURPOSE:To improve operability and machining efficiency and to shorten machining process by performing normal/reverse repeated rotation of pipe electrode for drill machining while supplying machining liquid, in a drilling electric discharge machining for a longer hole in comparison with its diameter. CONSTITUTION:A mounting unit 31 and a pipe electrode 33 are subject to normal/reverse rotation of a predetermined angle repeatedly by a normal/reverse rotation of a predetermined angle repeatedly by a normal/reverse rotating motor 36, and pulse discharge is repeated between a workpiece 35 and the electrode to machine a thin hole. With the progress of machining, and according to consumption of the pipe electrode 33, a hole of a predetermined depth is machined while making following support of a support head 38. During machining, machining liquid is supplied from a flexible hose 32. By this construction, efficient machining of thin holes can be made. |
