Intelligent Sensing Unit for Estimation Roughness of Electrical Discharge Machining

Haw-Ching Yang, Chun-Hong Cheng, Ting-Wei Su, Lu-Wen Kung, Chia-Ming Jan, Wen-Chieh Wu, Min-Nan Wu

Abstract


Estimating the quality of an electrical discharge machining (EDM) workpiece is challenging when attempting to extract features from the stochastic and time-consuming processes. To solve this problem, an intelligent sensing unit for EDM (ISU-EDM) is proposed to extract key machining features for estimating workpiece roughness. During machining, the ISU-EDM simultaneously samples the signals of both the discharge current and voltage, while automatically segmenting the signals according to tool location and discharge effectiveness. Furthermore, the machining features could be extracted from the segmented data by a genetic-algorithm-based distribution fitting method. After applying the features to an automated virtual metrology system, experimental results show that the mean absolute percentage error of roughness estimation is less than 15%.

Keywords


electrical discharge machining, discharge machining features, genetic algorithm, feature distribution fitting

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