Mist Characterization in Drilling 1018 Steel Page: 7
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were more than 50% less than the drills with MQL supplied externally. For the external MQL
supply, the uncoated drills showed the highest measured temperature, greater than 5500C,
whereas no significant variations were shown between the drills with different coatings. The
researchers noted that coated drills had a significant effect on the reduction of the workpiece's
temperature (Zeilmann et al., 2006).
Key Engineering Materials published research performed by Rahim and Sasahara on the
external MQL drilling of a nickel-based superalloy (Rahim et al., 2010). The scope of their
experiments was to determine the difference that palm oil and synthetic ester lubricants had on
the surface integrity of Inconel 718 or NiCr20TiAl. At the time of their research, few studies had
been performed on the performance of drilling Inconel 718, and inadequate investigations had
been performed with the use of MQL. The material used in the machining was a round bar with a
diameter of 50 mm and a thickness of 20 mm. The average nominal hardness of the material was
approximately 38 HRC. An indexable carbide drill was used to drill holes of 14 mm in diameter.
The drill was coated with TiA1N, a point angle of 130 degrees, helix angle of 30 degrees and
mounted on a standard tool shank. The drilling parameters used during the process were varying
cutting speeds of 30, 40 and 50 m/min, and feed rates of 0.05 and 0.1 mm/rev. Both the palm oil
and synthetic ester were externally supplied at approximately 10.3 ml/h. To examine the
resulting surface, a vision based measuring machine and a scanning electron microscope (SEM)
were used. The material was then sectioned, grind, polished and etched to observe the
deformation and microhardness (tested under 50 lb load). Under palm oil lubrication, the surface
roughness of the material decreased with higher cutting speeds, but increasing the feed rate
raised the surface roughness value. The surface roughness was measured from 0.6 to 0.9 pm and
1 to 1.2 pm under feeds of 0.005 and 0.11 mm/rev, respectively. Synthetic ester produced a
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Cole, Ian. Mist Characterization in Drilling 1018 Steel, thesis, August 2012; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc149573/m1/16/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .