In drilling, chip-clogging results in increased drilling temperature, excessive tool wear, and poor hole quality. Especially, in microdrilling, low rigidity of the tool and inability of cutting fluid to penetrate narrower tool–workpiece interface significantly reduce the drilling performance. A novel bubble-mixed cutting fluid delivery method proposed in this research aims toward achieving a high-performance micro deep-hole drilling process with a significant reduction in the consumption of cutting fluid. Experimental results show that the bubble-mixed cutting fluid delivery method achieves lower thrust force during drilling, higher drilled depth before tool breakage, and lower dimensional and circularity errors when machining deep holes in comparison with dry cutting or conventional flood delivery method. It is also found that the smaller-sized bubbles effectively penetrate the tool–workpiece interface during the drilling producing deeper holes by better chip evacuation and cooling.

References

References
1.
Ogawa
,
M.
, and
Kazuo
,
N.
,
1985
, “
Effects of Chip Splitting Nicks in Drilling
,”
CIRP Ann.-Manuf. Technol.
,
34
(
1
), pp.
101
104
.
2.
Nambu
,
Y.
,
Ochiai
,
K.
,
Horio
,
K.
,
Kaneko
,
J.
,
Watanabe
,
T.
, and
Matsuda
,
S.
,
2011
, “
Attempt to Increase Step Feed by Adding Ultrasonic Vibrations in Micro Deep Drilling
,”
J. Adv. Mech. Des., Syst., Manuf.
,
5
(
2
), pp.
129
138
.
3.
Kim
,
D. W.
,
Lee
,
Y. S.
,
Park
,
M. S.
, and
Chu
,
C. N.
,
2009
, “
Tool Life Improvement by Peck Drilling and Thrust Force Monitoring During Deep-Micro-Hole Drilling of Steel
,”
Int. J. Mach. Tools Manuf.
,
49
(
3–4
), pp.
246
255
.
4.
Astakhov
,
V. P.
,
2001
, “
Cutting Fluids (Coolants) and Their Application in Deep-Hole Machining
,” accessed June 14, 2019, http://viktorastakhov.tripod.com/DH/coolant.pdf
5.
Xi
,
X.
,
2013
, “
Controlled Translation and Oscillation of Micro-Bubbles Near a Surface in an Acoustic Standing Wave Field
,”
Ph.D. thesis
, Imperial College London, London.https://spiral.imperial.ac.uk/bitstream/10044/1/10981/1/Xi-X-2013-PhD-Thesis.pdf
6.
Donnelly
,
B.
,
O'Donovan
,
T. S.
, and
Murray
,
D. B.
,
2009
, “
Surface Heat Transfer Due to Sliding Bubble Motion
,”
Appl. Therm. Eng.
,
29
(
7
), pp.
1319
1326
.
7.
Gaging.com LLC
,
2013
, “Scherr-Tumico Industries: 8600 Series Specs,” Gaging.com LLC, Las Vegas, NV, accessed June 14, 2019, http://gaging.com/pdf/8600.pdf
8.
Uddeholm Global
,
2013
, “
UDDEHOLM STAVAX® ESR
,” Uddeholm Global, Hagfors, Sweden, accessed June 14, 2019, www.uddeholm.com/files/PB_ Uddeholm_stavax_esr_english.pdf
9.
Zhu
,
J.
,
Kim
,
H. J.
, and
Kapoor
,
S. G.
,
2013
, “
Microscale Drilling of Bulk Metallic Glass
,”
ASME J. Micro Nano-Manuf.
,
1
(
4
), p.
041004
.
10.
Fu
,
L.
,
Li
,
X.
, and
Guo
,
Q.
,
2010
, “
Development of a Micro Drill Bit With a High Aspect Ratio
,”
Circuit World
,
36
(
4
), pp.
30
34
.
11.
Munson
,
B. R.
,
Okiishi
,
T. H.
, and
Young
,
D. F.
,
2006
,
Fundamentals of Fluid Mechanics
,
Wiley
,
New York
.
12.
Al Ba'ba'a
,
H. B.
,
Elgammal
,
T.
, and
Amano
,
R. S.
,
2016
, “
Correlations of Bubble Diameter and Frequency for Air–Water System Based on Orifice Diameter and Flow Rate
,”
ASME J. Fluids Eng.
,
138
(
11
), p.
114501
.
You do not currently have access to this content.