Study On Ultrasonic-elid Composite Machining System And Machining Quality/ Efficiency Based On The Ultrasonic Vibration Applied To The Work-piece

Ceramic materials have many characteristics, such as high hardness, pressure and temperature of resistance, good abrasion resistance, and stable chemical properties. Therefore, ceramic materials are widely applied to various fields of industry, Specially, the technology in efficient processing for mirror is an important way to develop the sophisticated national defense. In addition, the technology of ceramic materials has a great significance in developing aerospace, national defense, and the technology among information, microelectronics and optoelectronics.In this paper, the author combined the high precision technology of ultrasonic vibration grinding with ultra-precision ELID grinding, intending to study necessary condition and possibility to make it as an efficient mirror processing. By ANSYS simulation analysis to research the method of selecting the amplitude transformer’s node position, impedance equation of acoustic system stability was established. Through the study of the grinding mechanism of ultrasound-ELID, the grinding force model of ultrasonic-ELID composite grinding was established. Based on the indentation fracture mechanics, the model of material removal rate can be built. Experimental results show the ultrasonic-ELID composite grinding improved the material removal rate. The grinding force increases as grinding depth grows under the ultrasound-ELID composite grinding. And grinding force under the ultrasonic is not always less than that under ELID grinding. By experiments, it proves that when the ultrasound was added on the work-piece, the vibration of the work-piece has slight influence on the oxidation film on the surface of grinding wheel. That is to say, ultrasound has little effect on the generation of oxidation film. This paper, studied the impact of different grinding parameters and electrical parameters to surface roughness, put up with the optimum parameters of ultrasonic-ELID composite grinding. It can be concluded that the work-piece surface quality of Ultrasonic-ELID composite grinding is better than ELID grinding via SEM photos under certain processing conditions. In addition, the influence of different grinding depth, different materials, different ultrasonic frequencies on work-piece surface morphology had been studied via experiment. Nano-composite ceramics surface quality is clearly better than alumina ceramic surface. And the effect of grinding is best when duty cycle is from 50% to70%. the research shows that optimization among electrical parameters and processing conditions is essential if making the ultrasonic composite ELID grinding mirror become an efficient processing method.