Experimental Research On Surface Waviness And Dynamic Characteristics Of Engineering Ceramics In Surface Grinding

Engineering ceramics have been widely applied in chemical engineering, military, aerospace and bioengineering for their excellent properties. Nowadays, the grinding with diamond is a common processing method for engineering ceramics. However, the service performances of grinding products are influenced badly by the surface waviness. Therefore, it is of great signification to eliminate or reduce the surface waviness as possible.In this paper, the experiments taking vibration and surface waviness of two engineering ceramics, namely ZrO2 and Al2O3 under surface grinding as research targets are operated. The research shows that, there are two kinds of waviness on the workpiece surface. One can be called rare wave caused by the forced vibration, and the other can be called dense wave caused by self-excited vibration.The effects of process parameters on rare wave of ZrO2 are analyzed through orthogonal method. It is shown that the rare wave amplitude increases as the grinding depth increases. The effects of wheel speed and workpiece speed are complex, and there are obvious interactions between them.When grinding engineering ceramics the spindle is apt to generate self-excited vibration, which leads to the dense wave. And the larger the grinding depth and workpiece speed are, the larger the dense wave amplitude is. It also shows that the influence of workpiece speed to the self-excited vibration is larger.The research has confirmed that the effects of process parameters on surface waviness are accomplished by changing dynamic characteristics of grinding process. It is also proved that the grinding stiffness, geometrical constraint and amplitude of dynamic grinding force have greater influences on rare wave, while contact stiffness of wheel has greater influence on dense wave.It can be found that the surface waviness of Al2O3 is greater than that of ZrO2 because their removal mechanisms are different.