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  • 1
    Electronic Resource
    Electronic Resource
    Surface Integrity Induced by Abrasive Machining Sapphire Wafer (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 53-54 (July 2008), p. 311-316 
    Details
    ISSN: 1662-8985
    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: Surface integrity of Sapphire wafer is the frontier technology to grow high qualityAlN/GaN films for high brightness light-emitting diode. Surface damage measurement methods forsingle crystal sapphire were introduced firstly. Classical types of surface deformation induced byabrasive machining, such as lattice deformation, strain, scratch, crack versus abrasive grits andchemical reaction were compared. With the development of modern grinding technology, depth ofthe damaged surface layer decreases from 10μm to 2μm or much less. Both crack, latticedeformation, twinning and strain were detected along the ground surface, only dislocation and strainwere appeared for polished sapphire surface. Usually, depth of the damaged layer was less than300nm using mechanical polishing process. Chemical mechanical polishing achieved the lowestdepth of the damaged surface and best surface roughness, scratch depth was used to descript thedamaged depth, which is about 1 nm, and so called no damage to the layer remains during chemicalmechanical polishing process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.53-54.311.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Optimising Shot Peening Parameters Using Finite Element and Discrete Element Analysis (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Applied mechanics and materials Vol. 10-12 (Dec. 2007), p. 493-497 
    Details
    ISSN: 1662-7482
    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: Shot peening is a cold-work process in which a stream of small spherical shot is blastedagainst a metallic component to generate a high compressive residual stress regime at the surface ofthe target. This paper presents a computational modelling of the shot peening process, in which thefinite element (FE) method was employed to study the elastic-plastic dynamic process of the shotimpact on a metallic target, and the discrete element (DE) method was used to study the multipleparticles dynamics. Statistical analyses of the shot impact data reveal the relationships betweenpeening process parameters and peening intensity, which can be used to optimise these processparameters to produce an improved outcome
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/38/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.10-12.493.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Study on Ultra-Precision Ball Surface Floating Polishing Kinematics Mechanism (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 109-112 
    Details
    ISSN: 1662-9752
    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 high precision balls are requested in national defense, astronautics and high-techcommercial domain urgently. Conventional precision machining methods are sensitive to uniformityof abrasives and machining environment. After precision machining, there are easily to produce thickdamaged layer on the ball surface because of machining stress and chemical conversion. On the basisof the floating polishing mechanism, a new scatheless ultra-precision polishing method of ball surfacecan solve the problems of abrasives uniformity effectively and damaged layer. In order to ensure thatthe new polishing method polishes ball surface equally, the appropriate angular velocities of the ballshould be selected. This paper sets up the mathematical model about the motion of ball. By analyzingand simulating the relationship of the angular velocities, the best processing parameters are acquired
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.109.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    PCBN Tool Wear Mechanism in Interrupted Hard Turning SAE8822 Hardened Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 315-316 (July 2006), p. 329-333 
    Details
    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 wear behaviour in the precision interrupted hard part turning SAE8822 casehardened steel by BN250 PCBN cutting tool was studied. Experimental results showed that themain wear mechanism for the PCBN tool was the edge chipping by the fluctuation of cutting forcesand cutting temperature. The oxidization and diffusion of the elements between workpiece andPCBN tool decrease the bonded strength between binder and cBN crystal, then lead to the damageof PCBN cutting tool
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.315-316.329.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    PCBN Tool Wear Mechanism in Hard Turning Hardened Bearing Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 315-316 (July 2006), p. 334-338 
    Details
    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 wear pattern and mechanism during continuous hard turning GCr15 hardenedbearing steel with BZN8200 PCBN cutting tool was studied. Experimental results showed that themain wear pattern is crater wear in rake face and mechanical wear in flank face, the main wearmechanism is made-up with adhesive, oxidization and diffusive wear. The adhesive wear isgenerated by melt workpiece material flows with binder material of PCBN tool during initial cutting,oxidative wear is derived by cutting temperature and pressure of cutting zone when the flank wearincrease after initial cutting, diffusive wear phenomenon is the absolute mechanism with thediffusive effect between workpiece and tool material in final cutting time
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.315-316.334.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Prediction of Precision Hard Cutting Force Based on Unit Cutting Model (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 315-316 (July 2006), p. 380-384 
    Details
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.315-316.380.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    On Study of Cutting Forces Generated by Minor Cutting Edges (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 484-487 
    Details
    ISSN: 1662-9752
    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: An experimental procedure was developed to separated the uncertain cutting forcesgenerated by the minor cutting edges for interpreted the force components generated by the main andminor cutting edge. Cutting forces generated by minor cutting edges were investigated byexperiments in precision hard part machining hardened GCr15 bearing steel with BZN8200 PCBNtool. With the improved chip loads, constitutive model and chip flow angle model, the predictedcutting forces show great agreement with the experimental results and verified the reliability of animproved cutting force model
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.484.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Parameters Optimization on the Lapping Process of 9Cr18 with Taguchi Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 359-360 (Nov. 2007), p. 158-161 
    Details
    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: 9Cr18 is a type of martensite stainless steel. It has high hardness, chemical stability, fineanticorrosion, wearable and quench stability. It has been used in different areas withhigh-anticorrosion and high polishing surface as mirror. So it requires for the high level surfacequality after lapping and polishing. In this paper, the surface quality (surface roughness and flatness)of 9Cr18 is discussed with lapping parameters which include velocity, load and time distribution oftwo lapping steps(rough lapping and Ultra-precision lapping). In order to optimize those parameters,an optimization experiment for lapping 9Cr18 with Al2O3 was designed by Taguchi method. Finally,the optimum condition of each factor can be determined that speed: 80rpm, load:3.0kPa, and timedistribution: rough lapping time=15min, Ultra-precision lapping time＝45min are the optimumconditions for both Ra and Wt
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.359-360.158.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Current Situation and Trend of Ultra-Precision Abrasive Machining (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 364-366 (Dec. 2007), p. 690-695 
    Details
    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: With increasing trend toward automatic manufacture and demands for improved quality,position of ultra-precision machining processes is considered as more and more important. As themain processes of ultra-precision machining, abrasive machining processes can be chiefly dividedinto free abrasive processes and fixed abrasive processes. Typical techniques such as chemicalmechanicalpolishing, ELID, Flat Honing and so on have been reviewed and compared with eachother in preliminary aspects such as surface quality, finish accuracy and finish efficiency. Thedevelopment trend of ultra-precision abrasive machining will have great efforts on realizing theintegration with high accuracy, high efficiency and low cost
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.690.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Experimental Study on the Ultraprecision Lapping Technology of the Copper Substrates for Alloy Films (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 359-360 (Nov. 2007), p. 349-354 
    Details
    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: To obtain the amorphous alloy films with superior properties by method ofelectrochemical deposition, the accuracy requirement for the copper substrates for Alloy Films isextraordinarily strict. The ultraprecision lapping technology for the copper substrate employingpolyurethane polishing pad and flannel pad is studied in this paper, surface roughness, materialremoval rate and change process of surface construction of copper substrates are discussed. Theinfluences of the different lapping parameters on the surface roughness, material removal rate andthe influences of lapping load on copper substrate surface formation in the ultraprecision lappingprocess of copper substrate are both discussed. Experiment results show that the surface scratch willdisappear by employing polyurethane polishing pad and flannel pad, and an extremely smoothsurface of copper substrate with roughness 6nm Ra is obtained in the final finishing lappingprocess
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.359-360.349.pdf
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