Machining of nickel-base, Inconel 718, alloy with ceramic tools under finishing conditions with various coolant supply pressures

Surface integrity after post processing of EDM processed Inconel 718 shaft

“…In recent years, WC insert milling is frequently assisted by high-pressure coolant application to achieve an even further improved level of productivity, explored, e.g. by Ezugwu et al [4]. As such, development of the milling process of difficult to machine materials has either focused on improving the properties of the insert tool material to withstand the cutting conditions or to increase the cutting speeds [5].…”

Improving tool life using cryogenic cooling

“…But during machining of Ti-6Al-4V the performance of CBN tools in terms of tool life was found to be poor compared to uncoated carbide tools and probably it is due to rapid notching and excessive chipping of the cutting edges (Ezugwu et al, 2005a). Machining of Incol 718 with whisker reinforced ceramic tools gave better performance in terms of tool life under high-pressure coolant supplies compared to conventional coolants (Ezugwu et al, 2005b;Ezugwu and Bonney, 2004). Seven hundred and forty percent improvement of tool life was reported at a coolant pressure of 203 bar and a cutting speed of 50 m/min.…”

Modeling notch wear of ceramic tool in high speed machining of Nickel-based superalloy

“…The high cutting temperature causes the carbide to rapidly wear, so ceramic tools are well suited to machine this alloy at high cutting speed. Some research work has been done to investigate the cutting performance of ceramic tools in machining nickel alloys at high cutting speeds [6][7][8][9][10][11][12][13][14][15][16] . From these studies it can be found that one of the most severe failure modes that controls tool life in machining nickel alloy is the depth-of-cut notch wear (DOC notching).…”