Study On Two Dimensional Ultrasonic Vibration Grinding Temperature Field Distribution Character Of Nano Zro₂ Ceramics

The ceramics material has many merits because of its ionic bond and covalent bond, such as high brittleness, low break toughness, high elastic coefficient and so on, therefore the hard brittle ceramics are very difficult to carry on milling, planning, rubbing, throwing, drilling and so on. At present, the grinding machining using of diamond tool (mainly the grinding wheel) is the essential way of the ceramics removal processing. Because the relative movement speed between the cutting tool and the work piece is very fast, and the hardness of the work piece and the diamond is very high, thus causes the very high temperature in the contact surface between the cutting tool and the work piece, which causes the work piece heat injury and accelerates the cutting tool attrition. So, new advanced grinding methods which have high productivity and high integrality are needed urgently because of the abroad used ceramics.The application of TDUVG(Two Dimensional Ultrasonic Vibration Grinding) on the grinding machining of ceramics is a creation to search new high-efficient grinding technique. Through common grinding and TDUVG contrast experiments, the nano ceramics grinding temperature fields under TDUVG are experimental studied. Contrasting the characteristics, formation and distribution mechanisms of grinding specific energy, the grinding temperature influence rule was studied from grinding parameters under TDUVG, through the orthogonal regression analysis, the grinding temperature test formula of nano ZrO₂ ceramics can be obtained under TDUVG. On this foundation the effect of grinding temperature on ceramics surface topography , residual stress and microhardness were analyzed, and the grinding surface layer structure model of ceramics is established, the indicated material removal modes and temperature mechanisms are also studied. This paper also established a heat transmission model of ceramics workpiece during surface grinding. Based on the finite element method, the grinding temperature of nano ZrO₂ ceramics under different grinding conditions are numerical simulated .The uniform temperature distribution diagram is obtained and the wave constitution diagram of temperature field is achieved too.The results of this paper show that the ultrasonic vibration grinding method can greatly enlarge the plastic machining area of engineering ceramics grinding and can effectively lower the temperature in the grinding zone, thereby helps to improve the grinding performance of nano ceramics. The finite element numerical simulation result and the experimental value are basically anastomotic, which theoretically proves the reliability of numerical simulation result and provides a new method for the research of the grinding temperature field.