Wire electrical discharge machining has appeared mainly in response to the need for detachment with sufficiently high accuracy of parts of plate-type workpieces. The improvements introduced later allowed the extension of this machining technology to obtain more complex ruled surfaces with increasingly high requirements regarding the quality of the machined surfaces and the productivity of the wire electrical discharge machining process. Therefore, it was normal for researchers to be interested in developing more and more in-depth investigations into the various aspects of wire electrical discharge machining. These studies focused first on improving the machining equipment, wire electrodes, and the devices used to position the clamping of a wire electrode and workpiece. A second objective pursued was determining the most suitable conditions for developing the machining process for certain proper situations. As output parameters, the machining productivity, the accuracy, and roughness of the machined surfaces, the wear of the wire electrode, and the changes generated in the surface layer obtained by machining were taken into account. There is a large number of scientific papers that have addressed issues related to wire electrical discharge machining. The authors aimed to reveal the aspects that characterize the process, phenomena, performances, and evolution trends specific to the wire electrical discharge machining processes, as they result from scientific works published mainly in the last two decades.

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This paper describes the design optimization of the structure of a tool for producing curved holes by electrochemical machining and the results of machining experiments. Curved holes can be machined using a flexible tool that can be curved by the hole being processed by the tool itself. The tool for producing small holes of less than 6 mm diameter has a simple structure composed of a flexible tube and a columnar electrode tip. A tool device equipped with an ultrasonic vibration function was designed and fabricated to remove the sludge from the curved face of the hole during machining. Machining tests showed that the machining speed was able to exceed the target value of 1mm/min. : ECM, curved hole, machining speed, ultrasonic vibration, metal mold 1) 2) 4) 5) 6) 1-50-1 36 電気加工学会誌