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| Experimental Study on Tangential Ultrasonic-Assisted Mirror Grinding of Zirconia Ceramics |
| QIAO Jiaping 1, 2 , WANG Qiang 2 , WU Hanqiang 2 , ZENG Jiang 2 , WU Yongbo 2 |
1. Harbin Institute of Technology, Harbin 150000, China;
2. Southern University of Science and Technology, Shenzhen 518055, China |
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Abstract Zirconia ceramics are difficult-to-machine materials and their application are restricted as a result of the difficulty in precision machining due to their high brittleness and low fracture toughness. Against this problem, a tangential ultrasonic-assisted mirror grinding method was proposed. The effect of ultrasonic amplitude on the work-surface roughness, the grinding force and temperature, and the wear condition of grinding wheel with/without ultrasonic were studied. The results demonstrated that the mirror surface was successfully obtained on the zirconia ceramics workpiece by tangential ultrasonic-assisted grinding, and the work-surface roughness decreased by 43.8% to Ra19.9nm at ultrasonic amplitude Ap–p=4.66μm, compared with conventional grinding (Ap–p=0). The normal grinding force decreased with the increase of ultrasonic amplitude, with the maximum decrease of 34%, but the rate gradually slowed down. The change trend of grinding temperature was similar with that of grinding force, showing the temperature at Ap–p=4.66μm was lower than that without ultrasonic by 34.5%. In addition, the wear condition of grinding wheel was improved, reducing the falling off abrasive grains and extending the life of grinding wheel with ultrasonic.
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2022, 
