Green Cutting using Supersonic Air Jets as Coolant and Lubricant during Turning Authors Andrea Bareggi (presenter) Andrew Torrance Garret O’Donnell ICMR 2006 Department of Mechanical and Manufacturing Engineering The University of Dublin Trinity College Trinity College Dublin
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Green Cutting using Supersonic Air Jets as Coolant and Lubricant during Turning Authors Andrea Bareggi (presenter) Andrew Torrance Garret O’Donnell ICMR.
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Green Cutting using Supersonic Air Jets as Coolant and
Lubricant during Turning
Authors Andrea Bareggi (presenter) Andrew TorranceGarret O’Donnell
ICM
R 2
006
Department of Mechanical and Manufacturing Engineering
The University of Dublin
Trinity College
Trinity College Dublin
Introduction
Difficult-to-cut materials• Heat resistant alloys• Hard materials• Super stainless alloys (or
super-alloys)
Trinity College Dublin
ICM
R 2
006
Introduction
Difficult-to-cut materials• Heat resistant alloys• Hard materials• Super stainless alloys (or
super-alloys)
Trinity College Dublin
ICM
R 2
006
• Nickel base alloys• Cobalt base alloys• Titanium alloys• Iron base (high chromium
stainless steel) after Seco Technical Guide, Turning Difficult-To-Machine Alloy, S. Miller, Advanced materials means advanced engines, Interdisciplinary Science Review, vol.21 (2) (1996) pp.117-129
CoolantsTrinity College Dublin
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• Thermal damage
After P. Dahlman, M. Escursell / International Journal of Machine Tools & Manufacture vol.44 (2004) pp.109–115
CoolantsTrinity College Dublin
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• Thermal damage• Wearing by friction
After P. Dahlman, M. Escursell / International Journal of Machine Tools & Manufacture vol.44 (2004) pp.109–115
CoolantsTrinity College Dublin
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• Thermal damage• Wearing by friction• Built up edges
After P. Dahlman, M. Escursell / International Journal of Machine Tools & Manufacture vol.44 (2004) pp.109–115
CoolantsTrinity College Dublin
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• Thermal damage• Wearing by friction• Built up edges
• Sweeping and cleaning the chip-tool interface
Improving cooling techniquesTrinity College Dublin
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• Reducing cutting forces
• Reducing tool wearing
• Reducing workpiece temperature
• Reducing costs
• Reducing environmental impact
Using air jets: why?Trinity College Dublin
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• Good for environment
• Not toxic for the operator
• Cheap
• Good for chip sweeping
• More likely to penetrate into the chip-tool interface
• Capable of accelerating fluid particles to give better heat transfer
Experimental apparatusTrinity College Dublin
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• Ursus 225 Centre Lathe
• Kistler piezoelectric tool-force dynamometer
• WC inserts with different nose radius
• Supersonic nozzle Silvent 1011
• Hommel roughness tester
• Infrared camera
Test setupTrinity College Dublin
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• Cutting speed: 270 m/min• Depth of cut: 0.5 mm• Feed: 0.095 mm/rev• Insert nose radius: 0.4 mm• Rake angle: 5°• Air jet pressure (nozzle