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单晶高温合金微磨削中声发射机制及监测的研究

Study on the mechanism of acoustic emission and the monitoring in micro grinding single crystal superalloy
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摘要 为研究单晶高温合金在微磨削过程中的声发射机制,监测微磨棒的工作状态,设计单因素试验研究主轴转速、工件给进速度、磨削深度和微磨棒的磨损状态对声发射信号的影响。试验结果表明:随着主轴转速的增加,声发射均方根值减小;随着工件给进速度和磨削深度的增加以及磨棒磨损情况的加剧,声发射均方根值增大。频谱分析可知,声发射信号集中在5 kHz,20~35 kHz和50~60 kHz几个频段上,随着主轴转速的降低、工件进给速度的升高和磨削深度的增加,声发射信号在5 kHz和20~35 kHz频段的信号能量增强,在50~60 kHz频段的信号能量基本无变化;当磨棒发生磨损时,5 kHz,20~35 kHz和50~60 kHz频段的信号能量均出现较大增加。研究结果对提高微磨削加工的加工效率、表面质量,监测微磨削过程中磨棒的磨损有重要意义。 To study the acoustic emission mechanism of micro-grinding single crystal superalloy and monitor the working state of micro-grinding tool,the influence of spindle speed,feeding rate,grinding depth and wear of micro-grinding tool on the signal of acoustic emission was investigated by single factor experiment.The results show that with the increase of spindle speed,t he root-mean-square value of acoustic emission decreases;with the increase of feeding rate and grinding depth and wear of tool,the root-mean-square value increases.The signals of acoustic emission are concentrated at frequency bands of 5 kHz,20~35 kHz and 50~60 kHz,with the decrease of spindle speed,the increase of feeding rate and grinding depth,the energy of acoustic emission signal at 5 kHz,20~35 kHz frequency band increases,and the energy at 50~60 kHz frequency band basically does not change.When the tool is worn,the energy at 5 kHz,20~35 kHz and 50~60 kHz frequency band all increase significantly.The results are significant to improve the machining efficiency and surface quality and to monitor the wear of grinding tool in the process of micro grinding.
作者 周云光 董彪 马廉洁 谭雁清 张力 ZHOU Yunguang;DONG Biao;MA Lianjie;TAN Yanqing;ZHANG Li(School of Control Engineering Northeastem University at Qinhuangdao,Qinhuangdao 066004,Hehei,China)
出处 《中国工程机械学报》 北大核心 2020年第5期448-454,共7页 Chinese Journal of Construction Machinery
基金 国家自然科学基金资助项目(51905083) 河北省自然科学基金资助项目(E2019501094) 河北省高等学校科学研究项目(QN2019321)。
关键词 微磨削 镍基高温合金 声发射 磨削参量 磨具磨损 micro grinding nikel-based superalloy acoustic emission grinding parameter abrasive wear
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