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Stability of micro dry wire EDM: OFAT and DOE method

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Abstract

Micro dry wire electrical discharge machining (μDWEDM) is an environmental-friendly machining process where gas is used as the dielectric fluid instead of liquid. In this process, certain modifications of wire electrical discharge machining (WEDM) are required during the machining operation for stable machining. In μDWEDM, the process is considered stable if the machining is continuous without any interruption due to wire breakage or wire lag. However, in the present state of the arts, stable and smooth machining process using μDWEDM remains a critical issue. Hence, the objectives of this research are to establish a stable μDWEDM process using two different experimental approaches: one-factor-at-a-time (OFAT) and design of experiment (DOE) method. The investigation was performed on a stainless steel (SS304) with a tungsten wire as the electrode using integrated multi-process machine tool, DT 110 (Mikrotools Inc., Singapore). Types of dielectric fluid, dielectric fluid pressure, polarity, threshold voltage, wire tension, wire feed rate, wire speed, gap voltage, and capacitance were the controlled parameters. The machining length of the microchannels was measured using scanning electron microscope (SEM) (JEOL JSM-5600, Japan). Analysis based on these two experimental approaches shows that stable μDWEDM process is achievable when the types of dielectric fluid, dielectric fluid pressure, polarity, threshold voltage, wire tension, wire feed rate, and wire speed remain as the fixed parameters while the capacitance and gap voltage remain as the controlled parameters.

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Acknowledgements

The authors are thankful to the faculty and staff of the Micromanufacturing laboratory and Metallographic laboratory at IIUM for their support.

Funding

This research was funded by MOSTI under Research Grant SF15-016-0066.

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Authors and Affiliations

  1. Department of Manufacturing and Materials Engineering, Faculty of Engineering, International Islamic University Malaysia, P.O. Box 10, 50728, Kuala Lumpur, Malaysia

    Asfana Banu & Mohamed Abdul Rahman

  2. Mechanical Engineering Programme Area, Faculty of Engineering, Universiti Teknologi Brunei, Tungku Highway, Gadong, Bandar Seri Begawan, BE1410, Brunei Darussalam

    Mohammad Yeakub Ali

  3. Department of Mechanical and Maintenance Engineering, Faculty of Engineering, Fourah Bay College, University of Sierra Leone, Freetown, Sierra Leone

    Mohamed Konneh

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  1. Asfana Banu
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  2. Mohammad Yeakub Ali
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Correspondence to Mohammad Yeakub Ali.

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Banu, A., Ali, M.Y., Rahman, M.A. et al. Stability of micro dry wire EDM: OFAT and DOE method. Int J Adv Manuf Technol 106, 4247–4261 (2020). https://doi.org/10.1007/s00170-020-04923-9

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