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Manufacturing of Al Alloy Microrods by Micro Cutting in a Micromachining Center

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Department of Mechanical and Production Engineering, Ahsanullah University of Science and Technology, Dhaka 1208, Bangladesh
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Department of Mechanical Engineering, National University of Singapore (NUS), 10, Kent Ridge Crescent, Singapore 119260, Singapore
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Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK
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Centre for Sustainable Development, Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK
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Author to whom correspondence should be addressed.
Micromachines 2019, 10(12), 831; https://doi.org/10.3390/mi10120831
Received: 2 November 2019 / Revised: 23 November 2019 / Accepted: 28 November 2019 / Published: 29 November 2019
(This article belongs to the Section D:Materials and Processing)
This paper presents the micromanufacturing of aluminum (Al) alloy microrods using micro turning as a competing process to other nontraditional micromachining methods. In that regard, the challenges in such manufacturing have been identified and overcome. The strategies of step-by-step cutting have also been delineated. In addition, the influence of step size and step length on the cutting and thrust forces were investigated. The chip morphology for micromachining was examined using scanning electron microscopic imagery. The safe dimension of the microrod was calculated and, subsequently, used to fabricate microrod, conical tip rod, and grooved rod from 3 mm long and 1.5 mm diameter rod using an appropriately coded computer numerical control (CNC) micromachining center. Our results showed that the thrust force was responsible for part deflection, emphasizing the necessity for computing safe dimensions. At shallow step sizes, the thrust force was more dominant, causing plastic deformation associated with rubbing and burnishing. The chips produced were irregular and sliced in nature. Conversely, at high step sizes, the cutting force superseded the thrust force, resulting in chips that were spread more along the width as opposed to the depth. The chips also had a smoother interacting surface. Finally, micro turning was successfully implemented to manufacture milli-scale structures (i.e., 3 mm long) with micro features (150 to 230 μm diameter) on aluminum alloy materials. View Full-Text
Keywords: micromachining; aluminum (Al) alloy; microrods; microchips; micro components micromachining; aluminum (Al) alloy; microrods; microchips; micro components
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MDPI and ACS Style

Rahman, M.A.; Rahman, M.; Mia, M.; Asad, A.; Fardin, A. Manufacturing of Al Alloy Microrods by Micro Cutting in a Micromachining Center. Micromachines 2019, 10, 831.

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