Evaluation of Optimal Economic Life of Cemented Carbide Tool Turning AISI4340

Year 2017, Volume: 3 Issue: 2, 37 - 43, 13.11.2017

Olurotimi Akintunde Dahunsi , Olayinka Oladele Awopetu Tunde İsaac Ogedengbe , Tiamiyu İshola Mohammed Taiwo Micheal Adamolekun

https://doi.org/10.19072/ijet.310016

Abstract

As
turning operation proceeds on a lathe machine, it is required that sufficiently
good surface quality be achieved if all the affecting parameters, including
tool geometry are held constant. In this paper, the effect of tool geometry
variation due to wear in the case of C6 cemented carbide tool on AISI 4340, was
studied. Using surface roughness as yardstick for estimating the point beyond
which the maximum economic utilization derivable from the tool is hampered, it
was realized that each insert should be replaced after ten minutes of turning
operation to retain their optimum usefulness. The tool wear parameters were
found to be in linear relationship with the cutting time, while the average
surface roughness was modelled nonlinearly using an exponential function. A
fourth degree polynomial approximated the trend for the cutting force. Sharp
deflections were observed on the surface roughness and cutting force graphs
after the tenth minute. Generally for the entire cutting time, the measured
cutting force increased by about 33% while the flank wear width and crater wear
width increased by 170% and 56% respectively. Surface roughness also increased
by about 130%.

Keywords

Carbide tool, AISI 4340, surface roughness, tool wear

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