Proceedings of the
World Congress on Micro and Nano Manufacturing (WCMNM 2022 )
19–22 September 2022, Lueven, Belgium
doi:10.3850/978-981-18-5180-3_RP03-0055
A Study of Bulk Metallic Glass Drilling Process Near Plowing-dominated Region
Department of Mechanical Science and Engineering, University of Illinois: Urbana-Champaign, Urbana, IL 61801
ABSTRACT
Metallic glasses are a novel class of materials that have been intensively explored and developed for use in the manufacture of micro components due to their remarkable mechanical characteristics. This research investigates the microscale drilling of a Zr-based bulk metallic glass (BMG) near plowing-dominated regime. Experimental data shows that chip clogging becomes problematic as chipload is lower than the edge radius due to short and thick chips being generated. Three distinct chip formation characteristics including plowing, transition from plowing to shearing, and shearing regimes are observed. A chip thickness model for BMG microdrilling is developed by taking into account of the amorphous characteristics of BMG. At varying chipload values, the model shows good agreement with experimental results exhibiting three distinct chip formation features. An evaluation of burr formation suggests that the equivalent burr height could be used to identify three distinct chip formation regimes.
Keywords: Micro-manufacturing, Micro-drilling, Process Modelling, Metallic Glass.
Department of Mechanical Science and Engineering, University of Illinois: Urbana-Champaign, Urbana, IL 61801
ABSTRACT
Metallic glasses are a novel class of materials that have been intensively explored and developed for use in the manufacture of micro components due to their remarkable mechanical characteristics. This research investigates the microscale drilling of a Zr-based bulk metallic glass (BMG) near plowing-dominated regime. Experimental data shows that chip clogging becomes problematic as chipload is lower than the edge radius due to short and thick chips being generated. Three distinct chip formation characteristics including plowing, transition from plowing to shearing, and shearing regimes are observed. A chip thickness model for BMG microdrilling is developed by taking into account of the amorphous characteristics of BMG. At varying chipload values, the model shows good agreement with experimental results exhibiting three distinct chip formation features. An evaluation of burr formation suggests that the equivalent burr height could be used to identify three distinct chip formation regimes.
Keywords: Micro-manufacturing, Micro-drilling, Process Modelling, Metallic Glass.
