摘要
声发射技术可以实现无氧铜切削加工特征的监测与评价.采用声发射技术监测单颗金刚石磨粒旋转切削无氧铜,利用G-P算法重构出声发射时域信号相空间,采用自相关函数法计算出相空间时间延迟参数,通过相空间双对数曲线的计算,得到不同切削工况下的关联维数.研究结果表明,进给速度和切削速度对声发射信号影响较不显著,切深与声发射信号振幅呈正效应关系;声发射信号双对数曲线呈现阶段性增加趋势,并逐渐收敛于饱和状态,关联维数随着嵌入维数的增加先快速下降后趋于平稳;金刚石切削无氧铜的声发射信号具有混沌运动变化特性,在较小嵌入维数时,关联维数与切深和切削速度呈现线性负效应关系,与进给速度呈现线性正效应关系.该研究为无氧铜的切削加工提供理论参考.
Acoustic emission(AE)technology can be employed to monitor and evaluate the cutting process characteristics of oxygen-free copper.In this paper,AE technology was used to monitor single diamond abrasive grit for rotary cutting of oxygen-free copper.The G-P algorithm was used to reconstruct the phase space of AE time domain signals.The autocorrelation function method was used to determine the time delay of phase space,and the double logarithmic curve of phase space was calculated to obtain the correlation dimension of AE signal with different cutting parameters.The results show that the cutting speed and feed rate have little effect on the AE signals,and the cutting depth has a positive effect on the amplitude of AE signals.The double logarithmic curve of AE signals shows a phased increase trend and gradually converges to saturation.With the increase of the embedding dimension,the correlation dimension of AE signal shows a rapid decline and then stabilizes.The AE signals of diamond cut oxygen-free copper have chaotic motion variation characteristics.With small embedding dimension,the correlation dimension has a linear negative effect relationship with the cutting depth and cutting speed,and a linear positive effect relationship with the feed speed.This research provides a theoretical reference for the machining of oxygen free copper.
作者
吴海勇
WU Haiyong(College of Mechanical Engineering,Zhangzhou Institute of Technology,Zhangzhou 363000,China;Institute of Manufacturing Engineering,Huaqiao University,Xiamen 361021,China;Post-Doctoral Research Center,Fujian Longxi Bearing Group Co.,Ltd.,Zhangzhou 363000,China)
出处
《应用声学》
CSCD
北大核心
2020年第4期598-610,共13页
Journal of Applied Acoustics
基金
国家自然科学基金项目(51805175)
中国博士后科学基金项目(2019M652231)
福建省自然科学基金项目(2018J05146)
漳州市自然科学基金项目(ZZ2019J29)
漳州职业技术学院博士科研启动基金项目(ZZYB2001)。
关键词
关联维
单颗金刚石
无氧铜
声发射
Correlation dimension
Single diamond grit
Oxygen free copper
Acoustic emission
