| Summary: | 碩士 === 國立雲林科技大學 === 機械工程系碩士班 === 92 === Micro-Electro-Discharge Machining technique is used to manufacture micro-perforations. The use of a single electrode is limited in fabrication length and it can only manufacture single perforation. Besides, the electrode can be consumed in discharge process and therefore the number of perforations will be also limited.
Consequently, this paper aim main to design a mechanism for the constraints on the electrode, which can hold great quantity of electrode and possess automatic feed and correctional function. On condition that the electrodes no rotate , a 2×5 array of 10 electrodes with 0.3 mm diameter and 10mm pitch was used to machine perforations simultaneously for 0.5 mm-thick Aluminium alloy. Such as the production process of perforations can be a batch mode micro-EDM. A 40×100 array of perforations was successfully produced on condition that the mechanism automatically supply and correct when this electrodes were consumed due to discharge process.
In the multiple electrodes simultaneous discharge circuit, each of the multiple electrodes is electrically insulated and connected to the main power of EDM through a diode. A capacitor is inserted parallel to each discharge gap between each electrode and workpiece. Compared with conventional EDM in which only a singular discharge can be generated for each pulse, multiple discharges can dispersively be generated for each pulse in parallel spark EDM. Results of experiments on parallel spark EDM and conventional EDM show that not only is the machining process more stable, but the machining speed and surface roughness can also be improved with parallel spark EDM.
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