Effects of high-pressure cooling on the wear patterns on turning inserts used on alloy IN718

ABSTRACT Several emerging technologies are being explored to increase the efficiency of machining nickel based alloys. These include the so-called assisted machining processes. Within that group, use of high-pressure cooling has been increasing since its introduction in the 1950s by Pigott and Colwell. The present study compares changes in tool wear patterns for high-pressure cooling (HPC) with those for flood cooling during rough face-turning of wrought nickel-based alloy IN 718. The alloy was face-turned with uncoated carbide tools at a contact cutting speed of 30 m/min, using conventional and high-pressure coolants (HPCs) at 8 MPa (80 bar). Tool wear and cutting force components were recorded. HPC reduced flank wear more than 30%, and reduced cutting forces by more than 10%. In contrast, notch wear is higher and becomes predominant in HPC. Temperatures during turning were also measured and compared to the results obtained from finite element modeling to better understand differences in the notch formation tendency for HPCs compared with conventional.

[1]  A. T. Colwell,et al.  Hi-Jet System for Increasing Tool Life , 1952 .

[2]  M. Mazurkiewicz,et al.  Metal Machining With High-Pressure Water-Jet Cooling Assistance—A New Possibility , 1989 .

[3]  Álisson Rocha Machado,et al.  The Effects of a High-Pressure Coolant Jet on Machining , 1994 .

[4]  Radovan Kovacevic,et al.  Improving Milling Performance with High Pressure Waterjet Assisted Cooling / Lubrication , 1995 .

[5]  L. N. López de Lacalle,et al.  Using High Pressure Coolant in the Drilling and Turning of Low Machinability Alloys , 2000 .

[6]  Aldo Attanasio,et al.  3D finite element analysis of tool wear in machining , 2008 .

[7]  Philip J. Withers,et al.  Residual stresses in face finish turning of high strength nickel-based superalloy , 2009 .

[8]  Anders Wretland,et al.  The effect of grain size and hardness of wrought Alloy 718 on the wear of cemented carbide tools , 2010 .

[9]  I. Jawahir,et al.  Surface integrity in cryogenic machining of nickel based alloy—Inconel 718 , 2011 .

[10]  Zydrunas Vagnorius,et al.  Effect of high-pressure cooling on life of SiAlON tools in machining of Inconel 718 , 2011 .

[11]  J. Paulo Davim,et al.  Performance comparison of conventional and wiper ceramic inserts in hard turning through artificial neural network modeling , 2011 .

[12]  L. Nyborg,et al.  Influence of microstructure on wear behaviour of uncoated WC tools in turning of Alloy 718 and Waspaloy , 2012 .

[13]  María Henar Miguélez,et al.  Analysis of tool wear patterns in finishing turning of Inconel 718 , 2013 .

[14]  V.A.M. Cristino,et al.  Tribology in Metal Cutting , 2013 .

[15]  I. S. Jawahir,et al.  Cryogenic Machining-Induced Surface Integrity: A Review and Comparison with Dry, MQL, and Flood-Cooled Machining , 2014 .

[16]  M. Nicolescu,et al.  Influence of Tool Materials on Machinability of Titanium- and Nickel-Based Alloys: A Review , 2014 .

[17]  Kejia Zhuang,et al.  Notch wear prediction model in turning of Inconel 718 with ceramic tools considering the influence of work hardened layer , 2014 .

[18]  Fritz Klocke,et al.  Influence of the lubricoolant strategy on thermo-mechanical tool load , 2014 .

[19]  Domenico Umbrello,et al.  Experimental Investigation to Optimize Tool Life and Surface Roughness in Inconel 718 Machining , 2016 .