Wheel dressing is an important part of grinding, it influences not only the grinding quality ofthe workpiece,but also the cost of grinding.At present the single point mined diamond is widelyused as dresser in industry...Wheel dressing is an important part of grinding, it influences not only the grinding quality ofthe workpiece,but also the cost of grinding.At present the single point mined diamond is widelyused as dresser in industry.Because the mined diamond is rare in nature and dear,it has a practicalsignificance to find a substituting material for the mined diamond.Due to the isotropy of PCD(polyerystalline diamond),new sharp cutting edges will expose continuously during dressing opera-tions,maintaining high dressing efficiency.Tests show that dressing corundum wheel,especiallydressing those for internal grinding,PCD dresser is suitable to common hardnesses,and grains ofwheels and smaller depth of dressing.The authors consider that PCD dressing can be used to sub-stitute completely the mined diamond dresser and the cost of dressing may be reduced.展开更多
To obtain safety working before long-term early warning, we proposed a process for the preparation of luminescent films on metal substrate to detect the wear life. ZnO films were prepared on aluminum（Al） foils by th...To obtain safety working before long-term early warning, we proposed a process for the preparation of luminescent films on metal substrate to detect the wear life. ZnO films were prepared on aluminum（Al） foils by the magnetron sputtering technique. The microstructure, tribological properties and photoluminescence（PL） spectra of ZnO films before and after the friction test were investigated. The microstructure of ZnO films grown on Al foils exhibited a closely packed hexagonal cone shape. ZnO films were grown along the orientation perpendicular to the substrate. The tribometric tests revealed that the average friction coefficient of ZnO films was lower and more stable than that of the substrate. The results of PL spectra indicated that the effect of Al element on ZnO films led to shifts of the defect related visible band. The luminescent center of ZnO films shifted from the emission peak at 510 nm before the friction to 647 nm after the friction, indicating that the green light shifted into the red light as the friction occurred. The visible light was helpful to understanding the failure characteristics during the friction and wear, and provide an early indicator of the impending failure.展开更多
文摘Wheel dressing is an important part of grinding, it influences not only the grinding quality ofthe workpiece,but also the cost of grinding.At present the single point mined diamond is widelyused as dresser in industry.Because the mined diamond is rare in nature and dear,it has a practicalsignificance to find a substituting material for the mined diamond.Due to the isotropy of PCD(polyerystalline diamond),new sharp cutting edges will expose continuously during dressing opera-tions,maintaining high dressing efficiency.Tests show that dressing corundum wheel,especiallydressing those for internal grinding,PCD dresser is suitable to common hardnesses,and grains ofwheels and smaller depth of dressing.The authors consider that PCD dressing can be used to sub-stitute completely the mined diamond dresser and the cost of dressing may be reduced.
基金Funded by the National Natural Science Foundation of China(Nos.51245010,51405242)the Natural Science Foundation of Jiangsu Province of China(No.BK2012463)the Postdoctoral Science Foundation of Jiangsu Province(No.1201003B)
文摘To obtain safety working before long-term early warning, we proposed a process for the preparation of luminescent films on metal substrate to detect the wear life. ZnO films were prepared on aluminum（Al） foils by the magnetron sputtering technique. The microstructure, tribological properties and photoluminescence（PL） spectra of ZnO films before and after the friction test were investigated. The microstructure of ZnO films grown on Al foils exhibited a closely packed hexagonal cone shape. ZnO films were grown along the orientation perpendicular to the substrate. The tribometric tests revealed that the average friction coefficient of ZnO films was lower and more stable than that of the substrate. The results of PL spectra indicated that the effect of Al element on ZnO films led to shifts of the defect related visible band. The luminescent center of ZnO films shifted from the emission peak at 510 nm before the friction to 647 nm after the friction, indicating that the green light shifted into the red light as the friction occurred. The visible light was helpful to understanding the failure characteristics during the friction and wear, and provide an early indicator of the impending failure.
