Deposition of Trace Coolant Elements on Flank Face in Turning of mboxInconel 718 Under High Pressure Conditions
Toshiyuki Obikawa*1,, Zhenglong Fang*2, Wataru Matsumoto*2, Mamoru Hayashi*2, Hideaki Hattori*3, and Chikara Morigo*4
*1Tokyo Denki University
5 Senju Asahi-cho, Adachi-ku, Tokyo 120-8551, Japan
*2The University of Tokyo, Tokyo, Japan
*3Idemitsu Kosan Co., Ltd., Ichihara, Japan
*4Tokupi Co., Ltd., Yao, Japan
In this study, the coolant element deposition on the flank face of a coated tool in the turning of Inconel 718 when the coolant jet was supplied from the tool flank side at coolant pressures from 1 to 20 MPa was investigated. The flank wear-land was inspected after the cutting experiments using energy dispersive X-ray spectroscopy analysis to obtain the mappings of chemical elements contained in the workpiece, coating material, and coolant. It was found that coolant jet with pressures higher than 5 MPa extended the tool life dramatically compared to flood cooling. In contrast, increasing the coolant pressure beyond 5 MPa yielded only marginal improvements of the tool life, as has been reported previously for very high coolant pressures. Trace chemical elements contained in the coolant were mainly detected along the border of the tool-work contact area. The amounts of materials deposited had a complicated relationship with the pressure, and a large amount of sodium, silicon, calcium, and phosphorus deposited at very high coolant pressures of 10 and 20 MPa. It was concluded that the saturation of tool life extension at higher coolant pressures was ascribed to the thick deposited layer of a mixture of compounds, such as calcium phosphate and sodium silicide, along the border, which prevented the high-pressure coolant from penetrating into the tool/work contact area.
-  N. Suzuki, R. Enmei, Y. Hashimoto, E. Shamoto, and Y. Hatano, “Tool Failure Mechanism in High-Speed Milling of Inconel 718 by Use of Ceramic Tools,” Int. J. Automation Technol., Vol.8, No.6, pp. 837-846, 2014.
-  T. Obikawa and M. Yamaguchi, “Suppression of notch wear of a whisker reinforced ceramic tool in air-jet-assisted high-speed machining of Inconel 718,” Precis. Eng., Vol.39, pp. 143-151, 2015.
-  R. R. Srikant, P. N. Rao, V. V. Ramana, and M. Amrita, “Application of cutting fluids in machining of titanium alloys – a review,” Int. J. Adv. Manuf. Technol., Vol.91, pp. 2477-2498, 2017.
-  A. Krämer, F. Klocke, H. Sangermann, and D. Lung, “Influence of the lubricoolant strategy on thermo-mechanical tool load,” CIRP J. Manuf. Sci. Technol., Vol.7, pp. 40-47, 2014.
-  G. S. Su, Y. K. Guo, X. L. Song, and H. Tao, “Effects of high-pressure cutting fluid with different jetting paths on tool wear in cutting compacted graphite iron,” Trib. Int., Vol.103, pp. 289-297, 2016.
-  L. Li, M. Wu, X. Liu, Y. Cheng, and Y. Yu, “Experimental study of the wear behavior of PCBN inserts during cutting of GH4169 superalloys under high-pressure cooling,” Int. J. Adv. Manuf. Technol., Vol.95, pp. 1941-1951, 2018.
-  Z. Fang and T. Obikawa, “Turning of Inconel 718 using inserts with cooling channels under high pressure jet coolant assistance,” J. Mat. Process. Technol., Vol.247, pp. 19-28, 2017.
-  E. O. Ezugwu and J. Bonney, “Finish machining of nickel-base Inconel 718 alloy with coated carbide tool under conventional and high-pressure coolant supplies,” Trib. Trans., Vol.48, pp. 76-81, 2005.
-  V. T. G. Naves, M. B. Da Silva, and F. J. Da Silva, “Evaluation of the effect of application of cutting fluid at high pressure on tool wear during turning operation of AISI 316 austenitic stainless steel,” Wear, Vol.302, pp. 1201-1208, 2013.
-  R. B. Da Silva, W. F. Sales, E. S. Costa, E. O. Ezugwu, J. Bonney, M. B. Da Silva, and Á. R. Machado, “Surface integrity and tool life when turning of Ti-6Al-4V with coolant applied by different methods,” Int. J. Adv. Manuf. Technol., Vo.93, pp. 1893-1902, 2017.
-  Y. Ayed, G. Germain, A. Ammar, and B. Furet, “Tool wear analysis and improvement of cutting conditions using the high-pressure water-jet assistance when machining the Ti17 titanium alloy,” Precision Engineering, Vol.42, pp. 294-301, 2015.
-  Z. Fang and T. Obikawa, “Cooling performance of micro-texture at the tool flank face under high pressure jet coolant assistance,” Precis. Eng., Vol.49, pp. 41-51, 2017.
-  E. O. Ezugwu, J. Bonney, D. A. Fadare, and W. F. Sales, “Machining of nickel-base, Inconel 718, alloy with ceramic tools under finishing conditions with various coolant supply pressures,” J. Mat. Process. Technol., Vols.162-163, pp. 609-614, 2005.
-  A. Thakur and S. Gangopadhyay, “State-of-the-art in surface integrity in machining of nickel-based super alloys,” Int. J. Mach. Tools Manuf., Vol.100, pp. 25-54, 2016.
-  S. Pervaiz, A. Rashid, I. Deiab, and M. Nicolescu, “Influence of Tool Materials on Machinability of Titanium- and Nickel-Based Alloys: A Review,” Mat. Manuf. Processes, Vol.29, pp. 219-252, 2014.
-  D. Zhu, X. Zhang, and H. Ding, “Tool wear characteristics in machining of nickel-based superalloys,” Int. J. Mach. Tools Manuf., Vol.64, pp. 60-77, 2013.
-  J. Akedo, “Room temperature impact consolidation (RTIC) of fine ceramic powder by aerosol deposition method and applications to microdevices,” J. Therm. Spray Technol., Vol.17, pp. 181-198, 2008.
-  J. A. Williams and D. Tabor, “The role of lubricants in machining,” Wear, Vol.43, pp. 275-292, 1977.
-  T. Wakabayashi, J. A. Williams, and I. M. Hutchings, “The kinetics of gas phase lubrication in the orthogonal machining of an aluminum alloy,” Proc. Inst. Mech. Eng., Part J, Vol.209, pp. 131-136, 1995.
-  T. Obikawa, “Machining with least quantity lubrication,” in S. Hashmi et al. (Eds.), “Comprehensive Materials Processing,” Vol.XI, Amsterdam: Elsevier, pp. 255-281, 2014.