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TECHNICAL PAPERS

Experimental Investigation of Thermo-Mechanical Characteristics in Laser-Assisted Machining of Silicon Nitride Ceramics

[+] Author and Article Information
S. Lei, Y. C. Shin

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

F. P. Incropera

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

J. Manuf. Sci. Eng 123(4), 639-646 (Oct 01, 2000) (8 pages) doi:10.1115/1.1380382 History: Received December 01, 1999; Revised October 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Tool wear profile for PCBN insert during LAM of silicon nitride
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Predicted temperatures at the center of the laser spot, in the material removal plane, and at the measurement location
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Variation of maximum flank wear with machining time
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Variation of average flank wear with machining time
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Experimental system for LAM of silicon nitride
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Variation of cutting force components with workpiece temperature
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Variation of specific cutting energy with workpiece temperature
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Optical micrographs showing tool wear on rake and flank faces: (a) tm=1 min, (b) tm=3.5 min
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Optical micrographs of tool flank with chipping: (a) tm=4.5 min, (b) tm=9 min
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SEM micrographs showing: (a) heat-affected workpiece surface, (b) onset of oxidation due to laser heating, (c, d) gas bubble formation and detachment, (e) silica layer adjoining cutting tool
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SEM micrographs showing machined chips: (a) Tmr,se=1260°C, (b) Tmr,se=1570°C
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SEM micrograph of a chip segment
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SEM micrograph showing chip microstructure
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Variation of surface roughness with machining time
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SEM micrographs of a machined surface by (a) LAM and (b) grinding
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SEM micrograph of a surface ground to a depth of cut equal to 50 μm/pass. Arrows point at four typical areas: (1) microfracture area, (2) smeared area, (3) area covered with debris, and (4) smooth area 18.
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SEM micrograph of a section view of the machined surface by LAM
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Optical micrograph of a section view showing subsurface grinding damage at a depth of cut equal to 50 μm/pass. The median-type cracks are designated by “c,” and the plastic zones are designated by “p”18.

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