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극저온 냉각 및 나노유체 극미량 윤활을 적용한 티타늄 합금의 선반절삭가공 특성에 관한 연구

Experimental Characterization of Turning Process of Titanium Alloy Using Cryogenic Cooling and Nanofluid Minimum Quantity Lubrication

Journal of the Korean Society for Precision Engineering 2017;34(3):185-189.
Published online: March 1, 2017

1 성균관대학교 대학원 기계공학과

2 성균관대학교 기계공학부

1 Department of Mechanical Engineering, Graduate School, Sungkyunkwan University

2 School of Mechanical Engineering, Sungkyunkwan University

#E-mail: sangwonl@skku.edu, TEL: +82-31-290-7467, FAX: +82-31-299-4690
• Received: May 24, 2016   • Revised: October 15, 2016   • Accepted: December 21, 2016

Copyright © The Korean Society for Precision Engineering

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • Friction and Wear Characteristics of Surface-Modified Titanium Alloy for Metal-on-Metal Hip Joint Bearing
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Experimental Characterization of Turning Process of Titanium Alloy Using Cryogenic Cooling and Nanofluid Minimum Quantity Lubrication
J. Korean Soc. Precis. Eng.. 2017;34(3):185-189.   Published online March 1, 2017
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Experimental Characterization of Turning Process of Titanium Alloy Using Cryogenic Cooling and Nanofluid Minimum Quantity Lubrication
J. Korean Soc. Precis. Eng.. 2017;34(3):185-189.   Published online March 1, 2017
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Experimental Characterization of Turning Process of Titanium Alloy Using Cryogenic Cooling and Nanofluid Minimum Quantity Lubrication
Image Image Image Image Image Image Image
Fig. 1 Entire experimental system with cryogenic cooling (LN2) and nanofluid (hBN) MQL supply units
Fig. 2 Detailed view of the turning experimental system including the insert, workpiece, MQL nozzle and LN2 supply unit
Fig. 3 Measured resultant cutting forces
Fig. 4 Calculated coefficients of friction
Fig. 5 Optical images of machined surfaces
Fig. 6 3D Profile of machined surface in LN2 condition
Fig. 7 Measured surface roughness values (Ra) of machined workpiece
Experimental Characterization of Turning Process of Titanium Alloy Using Cryogenic Cooling and Nanofluid Minimum Quantity Lubrication

Experimental conditions

Cutting type External diameter turning
Workpiece Ti-6Al-4V (Ø : 50 mm)
Tool PVD coated carbide insert
Cutting speed 60 m/min
Feed per revolution 0.25 mm/rev
Depth of cut 2 mm
Cutting length 70 mm
Cryogenic cooling pressure 1.5 MPa
MQL flow rate 0.6 ml/min
MQL pressure 0.5 MPa
MQL oil Vegetable oil
Nanofluid hBN (0.5 wt.%)

Experimental design

Run Lubrication oil Cryogenic cooling
1 Wet -
2 MQL (Vegetable oil) -
3 hBN (Nanofluid) MQL -
4 - LN2
5 MQL LN2
6 hBN MQL LN2

Characteristics of MQL oil and hBN nanofluid

MQL oil hBN Nanofluid
Base oil Vegetable oil
Nano particle - hBN
(Lamella structure)
Particle size - Average 70 nm
Concentration - 0.5 wt.%
Table 1 Experimental conditions
Table 2 Experimental design
Table 3 Characteristics of MQL oil and hBN nanofluid