USE OF NANO HEXAGONAL BOR NITRIDE (HBN) ADDED CUTTING FLUID IN MILLING OF HARD TO CUT MATERIALS

Year 2019, Volume: 9 Issue: 2, 330 - 337, 30.12.2019

Bilal Kurşuncu

https://doi.org/10.36222/ejt.589483

Abstract

In machining processes, MQL
method is substantially preferred in terms of sustainable production because of
lower usage of cutting fluid and better cutting performance in comparison with
traditional techniques. On the other hand, it is also critical that the cutting
fluid used is not hazardous to human and environmental health. In the present
study, we aimed to investigate the cutting performance of AISI O2 steel in the
presence of the cutting fluid containing various amounts of environmentally
friendly Nano hexagonal boron nitride (Nano h-BN) based ethylene glycol (EG) by
minimum quantity lubrication (MQL) method. Nano h-BN at 1% and 2% percentage by
volume was added to the ethylene glycol and sonication was carried out for one
hour for both prepared cutting fluids. Based on the experimental results using
prepared cutting fluids, the highest cutting tool life was obtained in tests
using 2% h-BN containing cutting fluid with 2.4 m cutting length. The
improvement in tool life was approximately 46% using 2% h-BN containing cutting
fluid compared to using 1% h-BN containing cutting fluid in milling tests. 2%
h-BN containing cutting fluid compared to dry conditions in terms of tool life,
the increase was approximately 78%. The improvement in surface roughness value
measured on milled surface of workpiece material was approximately 60% using 2%
h-BN containing cutting fluid compared to dry conditions. Compared to using 1%
h-BN containing cutting fluid the improvement in surface roughness values was
approximately 46%. A reduction in the cutting forces measured by the increased
h-BN ratio in the prepared ethylene glycol based cutting fluid has occurred. As
a result of SEM images and EDS analysis of worn tools, it was observed that the
dominant wear mechanism was abrasion in all applied tests.

Keywords

Minimum quantity lubrication, hardmilling, hBN, 2D structure, AISI O2, tool wear, cutting performance

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