摘要
氧化锆陶瓷具有高脆性、低断裂韧性等特点,精密加工难度大,一直限制着其应用。针对这一难题,提出了切向超声辅助镜面磨削的精密加工方法,研究了超声振幅对工件表面粗糙度、磨削力和磨削温度的影响,以及有/无超声作用下砂轮的磨损状况等基础加工特性。结果表明,切向超声辅助磨削可以实现氧化锆陶瓷镜面加工,在振幅A;=4.66μm时,与传统磨削(A;=0)相比,工件表面粗糙度下降43.8%,达到了R;19.9nm;法向磨削力随着超声振幅增大而下降,最大下降34%,但下降速率逐渐变小;磨削温度也随着超声振幅增大而下降,当A;=4.66μm时,磨削温度比无超声时下降34.5%。此外,切向超声辅助磨削加工可以改善砂轮的磨损状况,减少砂轮上磨粒的脱落,延长砂轮使用寿命。
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 R;19.9nm at ultrasonic amplitude A;=4.66μm,compared with conventional grinding(A;=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 A;=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.
作者
乔家平
汪强
武韩强
曾江
吴勇波
QIAO Jiaping;WANG Qiang;WU Hanqiang;ZENG Jiang;WU Yongbo(Harbin Institute of Technology,Harbin 150000,China;Southern University of Science and Technology,Shenzhen 518055,China)
出处
《航空制造技术》
CSCD
北大核心
2022年第8期69-75,共7页
Aeronautical Manufacturing Technology
基金
科技部重点专项(2021YFF0700900)
国家自然科学基金(51975269)
深圳市科技计划(KQTD20170810110250357)。
关键词
氧化锆陶瓷
切向超声辅助磨削
表面粗糙度
磨削力
磨削温度
Zirconia ceramics
Tangential ultrasonic-assisted grinding
Surface roughness
Grinding force
Grinding temperature
