Research On Grinding Force And Surface Quality Of The Ultrasonic ELID Composite Internal Grinding Of ZTA Ceramics

The paper focuses on on grinding force and surface quality of the ultrasonic ELID composite internal grinding of ZTA ceramics. Firstly, a force model of ultrasonic ELID composite internal cylindrical grinding is established. Secondly, according to the theory of fracture mechanics of ceramics material and the force model that has been established, the critical grinding depth has achieved under ultrasonic ELID composite internal grinding. By analyzing the critical grinding depth, its change trend and sensitive items has known. Then, on the basis of the ELID dressing and turing devices that have been used, the improvement was made to ensure use well with ultrasonic vibration cutting tool system. At the same time, the experimental platform was built. Finally, using experiments the effectiveness of the grinding force model has verified as well as effects of critical grinding depth on surface quality and the sensitive sequence of the critical grinding depth to grinding parameters. This paper main research content is as follows:(1) The characteristics of grit’s motion is analyzed under axial vibration and the grit’s kinematic equation is established. By using Matlab the single particle’s trajectory is simulated, and the contact length of the grinding wheel and the workpiece is achieved. At the same time the electrolysis parameters are introduced into the dynamic number of effective grits with analysis its electrochemical action. Thereby a force model for the ultrasonic ELID composite internal cylindrical grinding is established.(2) The lower limit of the critical indentation load value P* was achieved according to the theory of fracture mechanics of ceramics material. Combined with the actual situation of ultrasonic ELID composite grinding, the interaction of a single grain and the transition surface of workpiece were analysised and P *expression was given, the critical depth of ultrasound ELID composite grinding agc was obtained ultimately.Then the numerical simulation was carried out to reveal effects of grinding parameters on the critical grinding depth and its sensitive sequences.(3) In order to ensure ELID inner dressing and turing devices used with ultrasonic vibration cutting system well, the existed devices were improved. Secondly, through determine the requency and damping characteristics and electrical parameters of the transducers which is ued in this paper, the upper and lower inductive power feeder which can be used in ultrasonic vibration cutting system was designed, and using the specific structure and size of support frame and the fixed frame to realize the connection of ultrasonic vibration cutting system with machine tool spindle and the inductive power feeder, Finally the experimental platform was completed.(4) Through experiments the effectiveness of the grinding force model was verified, and the trend of grinding parameters on grinding force was obtained. At the same time by the observation of workpieces surface quality under different grinding conditions, effects of critical grinding depth on surface quality was proved.