Diamond cup wheel is used widely as an important tool for machining ceramic tile.In this paper,nano rare-earth oxide and nano carbide were added in the segments of seven kinds of diamond cup wheels.The performance of ...Diamond cup wheel is used widely as an important tool for machining ceramic tile.In this paper,nano rare-earth oxide and nano carbide were added in the segments of seven kinds of diamond cup wheels.The performance of diamond cup wheels were tested on a special designed test machine by grinding two kinds of ceramic tiles.The surface morphology of the segments was examined by Scanning Election Microscopy(SEM) and the micro-hardness of segments was measured.The results showed that nano rare-earth oxide and nano carbide can fine segment micro structure,make grain boundary clear and increase grasping of diamond grits.They can increase also the wear resistance of diamond cup wheels as well as the grinding ratio.展开更多
To address the problems of thermal damage to a workpiece surface caused by the instantaneous high temperature during grinding and the difficulty in monitoring temperature in real time,the temperature field in the case...To address the problems of thermal damage to a workpiece surface caused by the instantaneous high temperature during grinding and the difficulty in monitoring temperature in real time,the temperature field in the case of composite surface grinding by a cup wheel is studied.In order to predict the grinding temperature,considering material removal and grinding force distribution,a nonuniform heat source model with different function distributions in the circumferential and radial directions in the cylindrical coordinate system is first proposed;then,the analytical model is deduced and the numerical model of the temperature field is established based on the heat source model.The validation experiments for grinding temperature field are carried out using a high-definition infrared thermal imager and an artificial thermocouple.Compared to the temperature field based on the uniform heat source model,the results based on the non-uniform heat source model are in better agreement with the actual temperature field,and the temperature prediction error is reduced from approximately 23% to 6%.Thus,the present study provides a more accurate theoretical basis for preventing bums in cup wheel surface grinding.展开更多
基金The project was funded by Guangdong R&D Plan Project(2004B10301005)
文摘Diamond cup wheel is used widely as an important tool for machining ceramic tile.In this paper,nano rare-earth oxide and nano carbide were added in the segments of seven kinds of diamond cup wheels.The performance of diamond cup wheels were tested on a special designed test machine by grinding two kinds of ceramic tiles.The surface morphology of the segments was examined by Scanning Election Microscopy(SEM) and the micro-hardness of segments was measured.The results showed that nano rare-earth oxide and nano carbide can fine segment micro structure,make grain boundary clear and increase grasping of diamond grits.They can increase also the wear resistance of diamond cup wheels as well as the grinding ratio.
基金This work was supported by the Natural Science Foundation of Hebei Province(Grant No.F2017202243)the Natural Science Foundation of Tianjin(Grant No.18JCTPJC54700)+1 种基金the State Key Laboratory of Robotics and System(HIT)(Grant No.SKLRS-2017-KF-15)the Science and Technology on Space Intelligent Control Laboratory(Grant No.ZDSYS-2017-08).
文摘To address the problems of thermal damage to a workpiece surface caused by the instantaneous high temperature during grinding and the difficulty in monitoring temperature in real time,the temperature field in the case of composite surface grinding by a cup wheel is studied.In order to predict the grinding temperature,considering material removal and grinding force distribution,a nonuniform heat source model with different function distributions in the circumferential and radial directions in the cylindrical coordinate system is first proposed;then,the analytical model is deduced and the numerical model of the temperature field is established based on the heat source model.The validation experiments for grinding temperature field are carried out using a high-definition infrared thermal imager and an artificial thermocouple.Compared to the temperature field based on the uniform heat source model,the results based on the non-uniform heat source model are in better agreement with the actual temperature field,and the temperature prediction error is reduced from approximately 23% to 6%.Thus,the present study provides a more accurate theoretical basis for preventing bums in cup wheel surface grinding.
