摘要
超声椭圆振动切削是针对难加工材料提出的一种辅助切削加工方法,其在SiC材料的加工过程中展现出了显著优势。本研究建立了超声椭圆振动辅助切削的有限元模型,研究了超声振动频率和振幅对SiC切屑形成、表面创成、切削力和残余应力的影响规律。分析结果表明,工件表面形貌很大程度上取决于金刚石刀具的运动轨迹,当振动频率大于400 MHz、纵向振幅小于50 nm以及横向振幅大于50 nm小于100 nm时,有利于形成较光洁的加工表面,提高加工质量。平均切削力随着振动频率的增加而减小,但是其下降幅度在不断衰减。增大横向振幅和纵向振幅均可使切削力减小,有利于提高SiC材料的可加工性。超声椭圆振动辅助切削产生的残余应力变化趋势遵循“勺形”轨迹,提高振动频率和减小振幅有利于工件表面残余压应力的形成,从而有利于提高工件表面加工质量。该研究结果对丰富硬脆性难加工材料的加工理论具有重要理论意义和实用价值。
Ultrasonic elliptical vibration cutting is an auxiliary cutting method proposed for difficult-tomachine materials,which has demonstrated significant advantages in the machining process of SiC materials.A finite element model of ultrasonic elliptical vibration assisted cutting was established in this paper,and the influence of ultrasonic vibration frequency and amplitude on SiC chip formation,surface creation,cutting force,and residual stress was studied.The analysis results indicated that the surface morphology of the workpiece largely depended on the motion trajectory of the diamond tool.When the vibration frequency was higher than 400 MHz,the longitudinal amplitude was less than 50 nm,and the transverse amplitude was greater than 50 nm and less than 100 nm,it was beneficial to form a smoother machining surface and improve machining quality.The average cutting force decreased with the increase of vibration frequency,but the magnitude of its decrease was continuously decreasing.Increasing both lateral and longitudinal amplitudes could reduce cutting forces and improve the machinability of SiC materials.The residual stress generated by ultrasonic elliptical vibration assisted cutting followed a“spoon shaped”trajectory.Increasing the vibration frequency and reducing the amplitude were beneficial for the formation of residual compressive stress on the workpiece surface,thereby improving the machining quality of the workpiece surface.The research conclusion has important theoretical significance and practical value for enriching the processing theory of hard,brittle and difficult-to-machine materials.
作者
刘冰
李玉莹
徐宗伟
王煜荣
张文洁
孙坷敔
LIU Bing;LI Yuying;XU Zongwei;WANG Yurong;ZHANG Wenjie;SUN Keyu(School of Mechanical Engineering,Tianjin University of Commerce,Tianjin 300134,China;School of Mechanical Engineering,Tianjin University,Tianjin 300192,China;State Key Laboratory of Precision Measuring Technology&Instruments,Tianjin University,Tianjin 300072,China)
出处
《材料科学与工程学报》
北大核心
2026年第1期92-102,共11页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(51805371)
国家级大学生创新创业训练计划项目(202410069006)。
关键词
碳化硅
超声椭圆振动切削
刀具轨迹
表面形貌
切削力
残余应力
Silicon carbide
Ultrasonic elliptical vibration cutting
Tool trajectory
Surface morphology
Cutting force
Residual stress
