Cutting edge preparation of microdrills by shear thickening polishing for improved hole quality in electronic PCBs
Journal article
Wang, J., Ke, M., Liao, J., Zhou, Y., Goel, S., Verma, J., Wang, X., Guo, W., Yuan, J. and Lyu, B. (2024). Cutting edge preparation of microdrills by shear thickening polishing for improved hole quality in electronic PCBs. Frontiers of Mechanical Engineering. 19 (15). https://doi.org/10.1007/s11465-024-0786-2
Authors | Wang, J., Ke, M., Liao, J., Zhou, Y., Goel, S., Verma, J., Wang, X., Guo, W., Yuan, J. and Lyu, B. |
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Abstract | Printed circuit boards are representative composite material and it’s high-quality drilling machining has remained a persistent challenge in the industry. The finishing of the cutting-edge of a microdrill is crucial to its performance in machining fine quality of holes with a prolonged tool life. The miniature size involving sub-micron scale geometric dimensions, complex flute shape, and low fracture toughness makes the cutting-edge of micro-drill susceptible to breakage. Until now this has been the primary limiting factor in edge preparation for microdrills. In this paper, a newly developed cutting-edge preparation method for microdrills was tested experimentally on electronic PCBs. The proposed method namely, shear thickening polishing (STP) showed a limitation on cutting-edge burrs and tool wear, beside showing 20% enhancement in hole position accuracy, 33% reduction in nail head, and 19% reduction in hole wall roughness compared to the original micro-drill. There is however a threshold as otherwise, excessive STP results in a blunt edge, which may accelerate the wear of microdrill and have negative impact on hole quality. This study provides a new approach for high-quality manufacturing of composite PCBs materials. |
Keywords | PCB drilling; Polishing; STP |
Year | 2024 |
Journal | Frontiers of Mechanical Engineering |
Journal citation | 19 (15) |
Publisher | Frontiers Media |
Springer | |
ISSN | 2095-0241 |
Digital Object Identifier (DOI) | https://doi.org/10.1007/s11465-024-0786-2 |
Web address (URL) | https://link.springer.com/article/10.1007/s11465-024-0786-2 |
Publication dates | |
Online | 30 May 2024 |
Publication process dates | |
Accepted | 07 Feb 2024 |
Deposited | 26 Feb 2024 |
Accepted author manuscript | License File Access Level Open |
https://openresearch.lsbu.ac.uk/item/964x7
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