摘要
基于工件超声振动磨削的单磨粒运动模型,建立超声振动磨削单磨粒最大切削厚度agm ax公式;基于压痕断裂力学,给出硬脆材料超声振动磨削塑性-脆性转变临界条件,进行超声振动磨削与普通磨削对比试验,应用SEM和AFM分析陶瓷磨削表面微观形貌特征,重点研究磨削参数对其塑性-脆性转变特征的影响。研究结果表明,砂轮平均磨粒尺寸是影响塑性-脆性转变最为主要的因素,砂轮速度对其影响次之,磨削深度对塑性-脆性转变的影响最小;得出只有当agm ax小于临界切削深度agc时,才能实现硬脆材料塑性域磨削的重要结论。
The motion model of the contact between abrasive particle and workpiece in two-dimension ultrasonic vibration grinding was analyzed, the maximum cutting depth of a grain were obtained. Based on indentation fracture mechanics, the critical condition of ultrasonic vibration grinding brittle-ductile transition was analyzed theoretically. The ultrasonic vi- bration and conventional diamond grinding of A1203 - ZrO2（n） ceramics were performed in order to investigate the effect of ultrasonic vibration grinding conditions on the brittle-ductile transition mechanism, the micro-topngraphy of the grinding surface were observed by AFM and SEM. Experiment results indicated that only when the maximum cutting depth of a grain less than critical depth, ductile regime grinding of ceramics can be realized, the grit size, workpiece velocity and grinding depth can affect the brittle-ductile transition.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2007年第1期113-117,共5页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(50475060)
河南省创新人才基金资助项目(省重大项目0421001200)
关键词
超声
振动磨削
微-纳米复合陶瓷
塑性-脆性转变
临界切削深度
ultrasonic
vibration grinding
micro-nano composite ceramics
brittle-ductile transition
critical depth of cut
