文献类型：期刊文献

中文题名：超声振动加工7075-T6铝合金应力场数值模拟

英文题名：Research on Ultrasonic Vibrations Machining of 7075-T6 Aluminum Alloy Surface

作者：刘爱军 周知进 胡斌梁 邵芳

第一作者：刘爱军

机构：[1]贵州理工学院;[2]湖南科技大学

第一机构：贵州理工学院

年份：2017

卷号：51

期号：12

起止页码：40-43

中文期刊名：工具技术

外文期刊名：Tool Engineering

收录：北大核心:【北大核心2014】；

基金：国家自然科学基金(51465009);贵州省科技合作计划项目(黔科合LH字[2015]7087)

语种：中文

中文关键词：普通车削;超声振动车削;7075-T6铝合金;应力场

外文关键词：7075-T6 aluminum alloy; ordinary cutting; ultrasonic vibration machining; stress field

摘要：由于铝合金属于难加工材料,采用普通机械加工难以达到预期效果。采用超声振动加工方法车削7075-T6铝合金试件应力场的变化。仿真结果表明:在Y方向,超声振动频率在10k Hz时,振幅12μm切削区域等效应力最大,振幅10μm等效应力次之,振幅8μm等效应力最小。而频率为40k Hz时等效应力正好相反。随着振动频率增加,切削力先减小后增大;在X方向,当振幅分别为10μm、12μm时,随振动频率升高,试件加工区应力先减小后增大,而振幅为8μm时,应力逐渐增大。当频率超过40k Hz后,其工件表面的应力场不受振幅影响且均呈下降趋势。超声振动频率控制在20-40k Hz范围内,振幅对切削力影响最小。随着振幅的增加,切削力先减小后增加。超声振动加工方法能有效地改善铝合金加工性能。
The numerical simulation of 7075 - T6 aluminum alloy specimen is carried out by ultrasonic vibration machining method, and the stress field in specimen processing zone is simulated with different frequency and amplitude. Experimental results indicate that：when the ultrasonic vibration frequency is the lOkHz, the maximum stress lies the amplitude of 12μm cutting area equivalent at the Y direction, the amplitude of 10μm equivalent stress times, the amplitude of 8μm equivalent stress is the smallest. When the frequency is 40kHz ,the equivalent stress is just the opposite. As the vibration frequency increases, the cutting force decreases firstly and then increases;In the X direction, the residual stress in the machined surface is irregular changing with the increase of frequency and amplitude. When the frequencies were more than 40kHz, no matter how the amplitude is, the stress field on the surface of the workpiece shows a downward trend. The ultrasonic vibration frequencies would be controlled within the range of 20 -40kHz, and the amplitude acts on the least influence on the cutting force. With the amplitude increasing, the cutting force decreases first and then increases. The ultrasonic vibration machining method can effectively improve the processing performance of aluminum alloy.