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Open AccessArticle

Technical Model of Micro Electrical Discharge Machining (EDM) Milling Suitable for Bottom Grooved Micromixer Design Optimization

1
Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, Slovenia
2
Department of Industrial Engineering, University of Padua, Via Gradenigo, 6/a, 35131 Padua, Italy
3
Chair of Micro Process Engineering and Technology (COMPETE), University of Ljubljana, Večna pot 113, 1000 Ljubljana, Slovenia
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(6), 594; https://doi.org/10.3390/mi11060594
Received: 20 May 2020 / Revised: 8 June 2020 / Accepted: 14 June 2020 / Published: 16 June 2020
(This article belongs to the Special Issue Analysis, Design and Fabrication of Micromixers)
In this paper, development of a technical model of micro Electrical Discharge Machining in milling configuration (EDM milling) is presented. The input to the model is a parametrically presented feature geometry and the output is a feature machining time. To model key factors influencing feature machining time, an experimental campaign by machining various microgrooves into corrosive resistant steel was executed. The following parameters were investigated: electrode dressing time, material removal rate, electrode wear, electrode wear control time and machining strategy. The technology data and knowledge base were constructed using data obtained experimentally. The model is applicable for groove-like features, commonly applied in bottom grooved micromixers (BGMs), with widths from 40 to 120 µm and depths up to 100 µm. The optimization of a BGM geometry is presented as a case study of the model usage. The mixing performances of various micromixer designs, compliant with micro EDM milling technology, were evaluated using computational fluid dynamics modelling. The results show that slanted groove micromixer is a favourable design to be implemented when micro EDM milling technology is applied. The presented technical model provides an efficient design optimization tool and, thus, aims to be used by a microfluidic design engineer. View Full-Text
Keywords: micromachining; micro EDM milling; empirical modelling; micromixer; design for manufacturing; computational fluid dynamics micromachining; micro EDM milling; empirical modelling; micromixer; design for manufacturing; computational fluid dynamics
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MDPI and ACS Style

Sabotin, I.; Tristo, G.; Valentinčič, J. Technical Model of Micro Electrical Discharge Machining (EDM) Milling Suitable for Bottom Grooved Micromixer Design Optimization. Micromachines 2020, 11, 594.

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