ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The grain cutting trace of elliptical spiral in workpiece two-dimensional ultrasonicvibration grinding(WTDUVG) is defined, the reason of machining accuracy improvement byapplying two-dimensional ultrasonic vibration is discussed. Adopting two-dimensional ultrasoniccomposite processing, the influences of grinding depth, worktable velocity, wheel granularity on thesurface roughness of Al2O3/ZrO2 ceramic nanocomposites were described. Experimental results ofAFM microstructure show that the material removal model in WTDUVG is dominated by ductileflow of material, some crystal refinement, the crush powder and grain pull-out are visible and there isalmost no fracture. Furthermore, the surface roughness in WTDUVG with coarse grit is about 30[removed info]40% less than that in CG under identical grinding condition; the qualitative analysis of X-diffractionresults indicated that the surface phases are composed of α-Al2O3, t-ZrO2 and small quality m-ZrO2,there are amorphous phase in the surface both with and without vibration grinding. M-zirconia phasetransitions rule in vibration and conventional grinding was found. Under definitive grindingconditions, the material removal mechanism of inelastic deformation is the principal removalmechanism of Al2O3/ZrO2 ceramic nanocomposites, the grit size of diamond wheel and vibrationgrinding mode have important influence on material removal mechanism of ceramic nanocomposites
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.329.445.pdf
Permalink