A comparative study between internal spray cooling and conventional external cooling in drilling of Inconel 718
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Inconel 718 is widely applied in aerospace industries as a typical difficult-to-cut material. Especially in its drilling process, the semi-closed cutting environment prevents coolant reaching cutting zones, leading to high cutting temperature and serious tool wear. Internal spray cooling is an effective way to improve cutting performance in drilling process. This paper presented a systematic investigation on the differences in cutting force, tool wear, geometric accuracy, and surface topography of holes in drilling of Inconel 718 assisted by external and internal cooling technologies using nitride-coated tools. The results illustrated that thrust force was much lower when drilling the same number of holes during normal wear and rapid wear stages and the tool life prolonged 2.05 times under internal spray cooling condition than that under conventional external cooling condition. Internal spray cooling produced more stable surface roughness Ra and more accurate hole diameter. Besides, surface defects, including material adhesion, smear, and grooves, were largely improved by internal spray cooling. This paper gave a systematic and detailed understanding of the advantages in drilling Inconel 718 process of internal spray cooling compared with the conventional external cooling.
KeywordsInternal spray cooling Inconel 718 Drilling Tool wear Surface defects
The authors would like to acknowledge the financial support from “National Nature Science Foundation of China (51605326),” the “Natural Science Foundation of Tianjin (17JCQNJC04000 and 16JCZDJC38300),” and “Research on the high efficiency machining technologies of GH4169 (X-process-20161037-071).”
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