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Analysis of the machinability of different types of sintered carbides with WEDM in both water and oil baths

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Abstract

The unconventional wire electric discharge machining (WEDM) technology represents a vital manufacturing technology in different industrial branches. This technology is essential because of the possibility to machine difficult-to-machine materials such as sintered carbides. For this reason, this study analyses the machinability of sintered carbides WKP23S, WSM33S and WK1 with WEDM in both water and oil baths. We investigated the influence of the machining parameters, namely, pulse off time, gap voltage, discharge current, pulse on time and wire feed, on the cutting speed, surface roughness and defect occurrence. We investigated 9 different roughness parameters, analysed surface morphology with an electron microscope and also analysed cross-sectioned samples. We found out that machining sintered carbides in oil bath yields better results than machining in deionized water. The oil tank prevents the removal of the cobalt binder, but it does not reduce fissure occurrence in any significant way. The lowest Ra value, that is 0.7 µm, was recorded for the WKP23S sample when machined in oil and Ra 0.9 µm when the same material was machined in water.

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Funding

CzechNanoLab project LM2018110 funded by MEYS CR is gratefully acknowledged for the financial support of the measurements/sample fabrication at CEITEC Nano Research Infrastructure.

This publication is a result of the project CACTU, Reg. No. CZ.02.1.01/0.0/0.0/17_049/0008397, which has been co-financed by European Union from the European Regional Development Fund through the Operational Programme Research, Development and Education.

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Authors and Affiliations

  1. Faculty of Mechanical Engineering, Brno University of Technology, Brno, Czech Republic

    Katerina Mouralova, Tomas Prokes & Radim Zahradnicek

  2. Faculty of Production Technologies and Management, Jan Evangelista Purkyně University, Ústí nad Labem, Czech Republic

    Libor Benes

  3. Department of Machine and Industrial Design, VSB - Technical University of Ostrava, Ostrava, Czech Republic

    Jiri Fries

  4. Institute of Scientific Instruments of the CAS, V. V. I, Brno, Czech Republic

    Tomas Plichta

Authors
  1. Katerina Mouralova
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  2. Libor Benes
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  3. Tomas Prokes
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  4. Radim Zahradnicek
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  5. Jiri Fries
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  6. Tomas Plichta
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Contributions

Katerina Mouralova: conceptualization, methodology, data curation, writing— original draft preparation, writing— reviewing and editing, supervision. Libor Benes: methodology, data curation, funding acquisition. Tomas Prokes: methodology. Radim Zahradnicek: data curation, Methodology. Jiri Fries: data curation, funding acquisition. Tomas Plichta: data curation.

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Correspondence to Katerina Mouralova.

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Mouralova, K., Benes, L., Prokes, T. et al. Analysis of the machinability of different types of sintered carbides with WEDM in both water and oil baths. Int J Adv Manuf Technol 125, 2705–2715 (2023). https://doi.org/10.1007/s00170-023-10913-4

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  • DOI: https://doi.org/10.1007/s00170-023-10913-4

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