Study on Material Removal Mechanism of Fine-Crystalline ZrO₂ Ceramics under Two Dimensional Ultrasonic Grinding

Abstract

In the paper, the machining characteristics of two dimensional ultrasonic grinding(TDUG) are analyzed, and based on the analysis of the working locus of abrasive particle under TDUG and mechanical performances of fine-crystalline ZrO2 ceramics, a theoretical model of material removal rateMRRis proposed under TDUG with workpiece adhered to ultrasonic vibration respectively from the orthogonal directions. The model shows that any increase of static load, size of grain, work speed, number of effective dynamic abrasive particle, the amplitude and frequency of tool or any decrease of fracture toughness property and hardness will result in the increase of the MRR, and the theoretical model of the MRR is tested, meanwhile the paper draws the conclusion that the surface quality under TDUG is superior to that under common grinding, which is tested by the means of grinding of fine-crystalline ZrO2 ceramics.

Surface topography of fine-grained ZrO2 ceramic by two-dimensional ultrasonic vibration grinding

“…Ultrasonic vibration machining hard and brittle material formed topology on the surface is not clear, which restricted the precision of engineering ceramics to achieve ultra-precision machining [4,5] . Twodimensional ultrasonic vibration grinding changed the abrasive movement trajectory, enhanced interference between the abrasive, significantly improved surface quality in the constant 'ironing' effect [6] . Based on the analysis of atomic force microscopy (AFM) and scanning electron microscope(SEM), fine-grained zirconia ceramic two-dimensional ultrasonic vibration grinding surface topography were analyzed in this paper.…”

The Machined Surface Residual Stress of Nano-Ceramics with Two-Dimensional Ultrasonic Vibration Assisted Grinding

“…Therefore, it is necessary to research residual tensile stress in the grinding of ceramic material. Under ultrasonic vibration grinding, material removal rate is improved [1][2][3], ceramic material plastic region is extended [2][3][4][5][6], but it is not clear that how the ultrasonic grinding influence upon the surface residual stress. In this paper, the surface residual stress features of ceramics on ultrasonic grinding is researched in order to improve the working reliability of ceramic materials.…”

Research on the Effects of Ultrasonic Frequencies on the Grinding Surface Quality of Nano-Composite Ceramics

“…But the research only focused on the low frequency instead of high frequency. In 2005 [5][6][7], the brittle-ductile transition and removal mechanics were analyzed theoretically by Zhao B. etc, and one importance was pointed that the vibration applied to specimen can change the abrasive grain abrasion which contributes to ultrasonic precise machining.…”