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TECHNICAL PAPERS

Laser-Assisted Machining of Magnesia-Partially-Stabilized Zirconia

[+] Author and Article Information
Frank E. Pfefferkorn, Yung C. Shin, Yinggang Tian

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288

Frank P. Incropera

College of Engineering, University of Notre Dame, Notre Dame, IN 46556

J. Manuf. Sci. Eng 126(1), 42-51 (Mar 18, 2004) (10 pages) doi:10.1115/1.1644542 History: Received July 01, 2003; Online March 18, 2004
Copyright © 2004 by ASME
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References

Figures

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Schematic of laser-assisted machining
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Temperature dependant specific heat and effective thermal conductivity of Mg-PSZ 19
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Surface temperature histories for different laser powers
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Comparison of average flank wear, VB, on tungsten carbide (WC) and polycrystalline Cubic boron nitride (PCBN) tools
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Composite SEM image of LAM zone created under nominal operating conditions (tool nose radius=0.8 mm;f=fracture;c=crack)
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X-ray diffraction data: integrated GADDS evaluation of ±20° Chi of (a) as received ground surface, (b) the HAZ showing transformation of initial monoclinic phase to tetragonal, and (c) LAM surface showing effects of stress and temperature on the material surface; (d) integrated GADDS evaluation of {111} cubic/tetragonal reflection, where the two scans with a broad maximum near 0° Chi are for LAM surfaces and the lower scan is for a ground surface
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Specific cutting energy, uc, as a function of laser power, Pl, for d=0.5 mm and f=0.02 mm/rev
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Specific cutting energy, uc, as a function of feed, f, for Pl=200 W and d=0.5 mm
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Force ratios as a function of laser power, Pl, for d=0.5 mm and f=0.02 mm/rev
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Wear morphology of PCBN tool used for LAM of PSZ after 52 min of cutting at nominal operating conditions (Case 1): (a) schematic, images of (b) nose, (c) primary flank, and (d) rake face
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Variation of average flank wear, VB, with material removal temperature, Tmr, and with linear extrapolations to estimate tool life
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Variation of specific cutting energy, uc, with average flank wear, VB
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Surface/sub-surface damage caused during LAM of PSZ: (a) no thermal damage at 100 W, (b–d) heat-affected zones, (e) gross failure at 300W, (f ) spalling and (g) axial cracking which occasionally occurred. Dark areas indicate cracks where dye has penetrated. LAM designates the machined surface.
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Average surface roughness, Ra, as a function of average flank wear, VB
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Maximum roughness height, Ry, as a function of average flank wear, VB
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Comparison of machinability metrics for determining optimum operating conditions

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