超声椭圆振动磨削SiC陶瓷的砂轮磨损与磨削性能研究  

Research on Wheel Wear and Grinding Performance of Elliptical Ultrasonic Vibration Assisted Grinding SiC Ceramics

作　　者：殷振 张坤[1] 戴晨伟 程敬彩 徐海龙 李华 YIN Zhen;ZHANG Kun;DAI Chenwei;CHENG Jingcai;XUN Hailong;LI Hua(College of Mechanical Engineering,Suzhou University of Science and Technology,Suzhou 215009;Suzhou Key Laboratory of Precision and Efficient Machining Technology,Suzhou University of Science and Technology,Suzhou 215009)

机构地区：[1]苏州科技大学机械工程学院,苏州215009 [2]苏州科技大学苏州市精密与高效加工技术重点实验室,苏州215009

出　　处：《机械工程学报》2024年第9期57-74,共18页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51905363);江苏省自然科学基金(BK20190940);江苏省高等学校自然科学研究面上(19KJB46008);江苏省研究生科研创新计划(KYCX21_3009)资助项目。

摘　　要：为探究超声椭圆振动磨削下砂轮磨损机制及其磨削性能,选用SiC陶瓷为加工对象,分别开展普通磨削(Conventional grinding, CG)、超声椭圆振动磨削(Elliptical ultrasonic vibration assisted grinding, EUVAG)的砂轮磨损试验。首先,利用超景深显微镜追踪观测砂轮表面微观形貌,并表征磨粒磨损形式,包括统计分析磨粒磨耗平台面积、磨粒出刃高度等,从而揭示超声椭圆振动对砂轮磨损机理的影响;其次,分析砂轮磨损对磨削过程(磨削力、比能和材料去除率)和工件表面质量(表面粗糙度、微观形貌)的影响规律,以及不同磨损状态下砂轮主要磨削性能随加工参数的变化规律。研究表明:相比CG,EUVAG能够减少磨粒大破碎和脱落比例、增大磨耗平台面积、延缓磨粒出刃高度下降速度;随着磨损状态的增加,两种磨削方式的磨削力总体上呈先快速增长、后波动性起伏、再小幅度下降趋势;超声椭圆振动的引入可显著降低磨削比能(es),且稳定磨损阶段的降低幅度范围为12.4%~34.0%;不论CG还是EUVAG,材料去除率均随磨损状态的增加而先增长、后减小,且EUVAG在磨损状态4时,材料去除率取得最佳值38.2×10^(6)μm^(3)/mm·s;在稳定磨削阶段,两种磨削方式的划痕表面均以脆性断裂为主,但施加超声椭圆振动有助于形成延性光滑平面。此外,总体上,较高磨削速度、较低进给速度更有利于降低磨削力;在各磨损状态下,提高磨削速度是降低表面粗糙度的直接手段,但不同磨损状态下获取最低表面粗糙度的进给速度不同。In order to investigate the wear mechanism and grinding performance of wheel under elliptical ultrasonic vibration assisted grinding,SiC ceramics were selected as the processing object to conduct wheel wear tests on conventional grinding(CG)and elliptical ultrasonic vibration assisted grinding(EUVAG).Firstly,the VHX-5000 ultra-depth of field three-dimensional microscope is used to track and observe the micro morphology of wheel surface,and to characterize the form of grain wear,including statistics and analysis the grain wear platform area,grain cutting height,etc.,then reveal the influence of elliptical ultrasonic vibration on wheel wear mechanism;Secondly,analyzing the impact of the wheel wear on the grinding process(grinding force,specific energy,and material removal rate)and workpiece surface quality(surface roughness,micro morphology),as well as the variation of the main grinding performance of wheel with processing parameters under different wear states.Research has shown that compared to CG,EUVAG can reduce the proportion of large breakage and grain shedding,increase the wear platform area,and delay the descent speed in the grain cutting height.As the wear status increases,the grinding forces of the two grinding methods generally show a trend of rapid growth at first,followed by fluctuations,and then a slight decrease.The introduction of elliptical ultrasonic vibration can significantly reduce grinding specific energy(es),and the reduction amplitude ranges from 12.4%to 34.0%in the stable wear stage.Whether in CG or EUVAG,material removal rate(MRR)first increases and then decreases with the increase of wear state,and the MRR of EUVAG reaches the optimal value(38.2×10^(6)μm^(3)/mm·s)at wear state 4;In the stable grinding stage,the scratch surfaces of both grinding methods are mainly characterized by brittle fracture,but the application of elliptical ultrasonic vibration helps to form a ductile smooth surface.In addition,higher wheel speed and lower workpiece feed speed are more conducive to reducing grind

关 键 词：超声椭圆振动磨削 SIC 砂轮磨损 磨削力 工件表面质量 

分 类 号：TG663[金属学及工艺—金属切削加工及机床] TG580