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  • A study of the micro-hole geometry evolution on glass by abrasive air-jet micromachining

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    Author(s)
    Li, Huaizhong
    Wang, Jun
    Kwok, Ngaiming
    Thai, Nguyen
    Yeoh, Guan Heng
    Griffith University Author(s)
    Li, Huaizhong
    Year published
    2018
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    Abstract
    Abrasive air-jet (AAJ) micromachining has become an attractive technology for the fabrication of micro-structures on a wide range of engineering materials. However, problems specific to effective mould construction still remain challenging. This paper presents a study on the evolution of micro and blind holes on glass during abrasive air-jet machining. Experiments were conducted under different practical settings of air pressure, particle mass flow rate and drilling time. A 3D laser measurement microscope was used to characterize the machined hole profiles. It was found that there was a clear evolution of the profiles of the ...
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    Abrasive air-jet (AAJ) micromachining has become an attractive technology for the fabrication of micro-structures on a wide range of engineering materials. However, problems specific to effective mould construction still remain challenging. This paper presents a study on the evolution of micro and blind holes on glass during abrasive air-jet machining. Experiments were conducted under different practical settings of air pressure, particle mass flow rate and drilling time. A 3D laser measurement microscope was used to characterize the machined hole profiles. It was found that there was a clear evolution of the profiles of the hole bottom surfaces. Three types of hole surface contours, i.e., convex, flat, and concave (reverse bell-shaped), were obtained within the operating range used, in which the first two types have rarely been reported in literature. The profile variation took place along with the setting parameters of particle flow rate and air pressure, which indicated that the particles distribution density across the cross section of a cylindrical nozzle also varied with the setting parameters. At a low flow rate, the hole bottom was formed with a convex shape, which might be attributed to the fact that the distribution of particles at the nozzle centre was less than that around the brim. As the particle flow rate increased, the bottom surface evolved from convex to flat or even concave. With a proper setting, AAJ can therefore be used to fabricate a micro hole with a desired bottom surface profile. The variation of abrasive particle distribution in the jet in the AAJ micromachining might be attributed to the flow bounce back and stagnation effects when the jet impacts on a target workpiece.
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    Journal Title
    Journal of Manufacturing Processes
    Volume
    31
    DOI
    https://doi.org/10.1016/j.jmapro.2017.11.013
    Copyright Statement
    © 2017 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.
    Subject
    Manufacturing engineering
    Manufacturing engineering not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/356090
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    • Journal articles

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