Pulse Classification for an Electrochemical Discharge Machining Process Based on Fuzzy Logic Approach
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International Journal of Precision Engineering and Manufacturing https://doi.org/10.1007/s12541-020-00385-x
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Pulse Classification for an Electrochemical Discharge Machining Process Based on Fuzzy Logic Approach Ricardo Martínez‑Alvarado1 · Everardo Efrén Granda‑Gutiérrez2 · Alejandra Hernández‑Rodríguez1 · Rolando Javier Praga‑Alejo1,3 Received: 20 November 2019 / Revised: 9 June 2020 / Accepted: 15 July 2020 © Korean Society for Precision Engineering 2020
Abstract A pulse classification technique for monitoring the type of discharges in an electrochemical discharge machining (ECDM) process is presented in this research paper. The performance of an ECDM process is affected by many factors which make it hard for control strategies to be formulated for this process. The pulse classifier plays an important role to develop control strategies and later to improve the process. The proposed system uses the current and voltage waveforms measured through the gap as input signals for the classification system. A fuzzy inference system (FIS) is used to categorize both input signals into one of the four proposed pulse types, according to their specific behavior. For the experimental validation, data samples taken during the machining process were recorded to evaluate the performance of the pulse classifier with raw data. Raw data of the gap signals is properly classified based on the proposed FIS. Keywords ECDM · Fuzzy logic · Electrical discharge gap · Pulse classification · Pulse discriminating · Pulse classifier
1 Introduction The world is advancing in technologies and applications that demand new materials and products with high strength-toweight ratio, hardness and temperature resistance and with miniature features that are increasing at a faster rate and with a high demand from the industry [1]. Electrochemical discharge machining (ECDM) is a non-traditional machining technology used for machining electrically non-conducting * Everardo Efrén Granda‑Gutiérrez [email protected] Ricardo Martínez‑Alvarado [email protected] Alejandra Hernández‑Rodríguez [email protected] Rolando Javier Praga‑Alejo [email protected] 1
Corporación Mexicana de Investigación en Materiales (COMIMSA, Mexican Corporation for Materials Research), Saltillo, Mexico
2
Universidad Autónoma del Estado de México (UAEMex, Autonomous University of Mexico State), Toluca, Mexico
3
Universidad Autónoma del Estado de Coahuila (UAdeC, Autonomous University of Coahuila State), Saltillo, Mexico
materials [2], such as glass [3] or quartz [4]; e.g. in [5] the manufacture of micro-channels in glassy materials for micro-fluidic devices is studied. However, ECDM is not limited to this kind of materials; it is also used to fabricate miniaturized products with electrically conductive materials, as it is a combination of two non-conventional machining processes: electrochemical machining (ECM) and electrical discharge machining (EDM). It works by forming an electrolytic cell [6]. In literature, the ECDM process has
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