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Micro-milling machinability of pure molybdenum

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Abstract

As a result of the miniaturization of machined shapes, the conventional micro-milling technology has been widely used in many industrial areas. However, the machining of some types of materials proved to be very difficult. One of the hard-to-machine materials is also pure molybdenum, which, thanks to its high melting temperature, is used, besides others, in the energy industry and for physical applications. To ensure proper functionality of the manufactured parts, it is essential that they are machined without defects and with the required surface quality. The aim of this study was to find an optimal tool with a diameter of 0.8 mm and to set the machine parameters for machining of pure molybdenum with the highest quality of the surface layer possible without any defects. For this purpose, 26-round design of experiment (DoE) was carried out, in which the parameters, like cutting speed, feed, and coating (yes/no) were systematically changed. The machined samples were evaluated for topography using a 3D profilometer; their morphology and burrs were studied using an electron microscope, and the microscopic implications on the microstructure of the subsurface layer were studied on the produced lamellae using transmission electron microscope (TEM). In addition, the tool wear curve was examined and evaluated. In this study, an optimal setup of machining parameters for pure molybdenum machining (cutting speed = 80 m/min, feed = 0.002 mm/tooth, non-coated tool) was found with which high-quality and defect-free surfaces can be machined.

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Acknowledgements

This work was carried out with the support of CEITEC Nano Research Infrastructure (ID LM2015041, MEYS CR, 2016–2019), CEITEC Brno University of Technology.

This work is an output of research and scientific activities of NETME Centre, supported through project NETME CENTRE PLUS (LO1202) by financial means from the Ministry of Education, Youth and Sports under the National Sustainability Programme I.

The article was supported by project no. FEKT-S-17-3934, Utilization of novel findings in micro and nanotechnologies for complex electronic circuits and sensor applications.

This research work was supported by the BUT, Faculty of Mechanical Engineering, Brno, Specific research 2016, with the grant “Research of modern production technologies for specific applications”, FSI-S-16-3717, and technical support of Intemac Solutions, Ltd., Kurim.

This work was supported through the internal grant provided by the Jan Evangelista Purkyně University in Ústí nad Labem, called SGS (Student Grant Competition), No. 0004/2015, and partly by the Ministry of Education, Youth, and Sport of the Czech Republic, the program NPU1, project No. LO1207.

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Authors and Affiliations

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

    K. Mouralova, T. Prokes, J. Bednar, J. Otoupalik & Z. Fiserova

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

    L. Benes

  3. Faculty of Electrical Engineering and Communication, Brno University of Technology, Brno, Czech Republic

    R. Zahradnicek

  4. INTEMAC Solutions Ltd., Kurim, Czech Republic

    Z. Fiala

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  1. K. Mouralova
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Mouralova, K., Benes, L., Prokes, T. et al. Micro-milling machinability of pure molybdenum. Int J Adv Manuf Technol 102, 4153–4165 (2019). https://doi.org/10.1007/s00170-019-03524-5

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