超声振动螺线磨削砂轮表面的功率谱密度分析  

Power spectrum density characterization of grinding wheel surface in ultrasonic vibration spiral grinding

作　　者：王秋燕 梁志强[2] 白硕玮 吴勇波 贾顺[4] WANG Qiuyan;LIANG Zhiqiang;BAI Shuowei;WU Yongbo;JIA Shun(School of Electromechanic Engineering, Qingdao University, Qingdao 266071, Shandong, China;Key Laboratory of Fundamental Science for Advanced Machining, Beijing Institute of Technology, Beijing 100081, China;Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China;Department of Industrial Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China)

机构地区：[1]青岛大学机电工程学院机制系,山东青岛266071 [2]北京理工大学,先进加工技术国防重点学科实验室,北京100081 [3]南方科技大学机械与能源工程系,广东深圳518055 [4]山东科技大学工业工程系,山东青岛266590

出　　处：《金刚石与磨料磨具工程》2021年第1期58-64,共7页Diamond & Abrasives Engineering

基　　金：国家自然科学基金资助项目(51705269,71701109)。

摘　　要：超声振动螺线磨削过程中,砂轮表面微观形貌的变化复杂。为准确表征其特征,采用功率谱密度分析方法,将砂轮表面的微观结构分解为不同频率、振幅和相位的谐波,对比分析不同磨削行程时普通磨削和超声振动螺线磨削砂轮表面的磨损行为。结果表明:砂轮表面功率谱密度曲线的斜率k随着磨削行程的增大而逐渐减小,即k越小砂轮表面磨损越严重。其中,在早中期磨削阶段(行程不超过60次),超声砂轮表面的斜率k明显大于普通砂轮表面的,而在中后期超声砂轮表面的斜率k下降的速率显著高于普通砂轮表面的,该变化趋势揭示了2种磨削方式下砂轮表面有效磨粒数和砂轮堵塞的变化规律。进一步分析发现磨粒磨平和脱落使得磨粒功率谱密度占比减小,砂轮堵塞使得功率谱密度曲线的总体能量值增大。在早中期磨损阶段,超声振动螺线磨削砂轮表面的有效磨粒数多于普通磨削砂轮表面的,而在中后期其砂轮堵塞情况比普通磨削砂轮的更显著。During the ultrasonic vibration spiral grinding process,the surface topography of the grinding wheel varies complicatedly.To accurately characterize the characters of the grinding wheel surface,a power spectral density(PSD)analysis method was adopted by decomposing the microstructure of the grinding wheel surface into harmonics of different frequencies,amplitudes and phases.The wear behaviors of the grinding surfaces after conventional grinding and ultrasonic vibration grinding in different grinding stages were compared and analyzed by using the PSD analysis.The results show that the slope k of the surface PSD curve of the grinding wheel gradually decreases with the increase of the grinding stage,which means that a smaller k represents more serious surface wear of the grinding wheels.Moreover,in the early wear stage,the slope k of the ultrasonic grinding wheel surface is significantly larger than that of the conventional grinding wheel surface,but in the later wear stage,the decline rate of the slope k of the ultrasonic grinding wheel surface is significantly higher than that of the conventional grinding wheel surface.This trend reveals the variation of the effective number of abrasive grains and the wheel loading on the grinding wheel surface under two different grinding methods.Further analysis reveals that the ground flat and pulled-outs of the abrasive grains decrease the proportion of the power spectral density of them,and the wheel loading increases the overall energy value of the PSD curve.In the early wear stages,the number of effective abrasive grains on the ultrasonic vibration grinding wheel surface was larger than that of the conventional grinding surface,whereas in the later stages,the grinding wheel loading in ultrasonic vibration grinding is more significant.

关 键 词：砂轮 超精密磨削 超声振动螺线磨削 功率谱密度 磨损行为 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3