基于包络解调分析法的数控车床镗孔振纹分析与改进  

Steady rests design in crank axle of spindle neck lathe and material rack topology optimization

作　　者：霍洪旭 蔚鑫 HUO Hongxu;YU Xin(Shenyang Branch,General Technology Group Machine Tool Engineering Research Institute Co.,Ltd.,Shenyang 110142,CHN;Allegion Security Technologies(China)Co.,Ltd.,Shanghai 200051,CHN)

机构地区：[1]通用技术集团机床工程研究院有限公司沈阳分公司,辽宁沈阳110142 [2]安朗杰安防技术(中国)有限公司,上海200051

出　　处：《制造技术与机床》2024年第3期64-68,共5页Manufacturing Technology & Machine Tool

摘　　要：针对数控车床镗孔表面振纹问题,文章采用由简至繁的原则,初步确定振纹故障来源,并利用卡盘浮动支撑工装来间接提高主轴刚性和缓解刀纹的深度,排除加工振纹与主轴关联;利用包络解调分析法,通过LC-810型振动信号采集分析仪对主轴前端和后端振动信号进行采集,均值分别在22.37 Hz、45.94 Hz;与NN3048和NU1038轴承故障特征频率22.127 Hz、44.792 Hz相近。通过轴承拆卸和镗孔实验,验证了包络解调分析法在轴承故障辨识的有效性。实验结果表明:NN3048轴承滚动体和NU1038轴承外环磨损是导致切削振纹的故障源,理论方法故障辨识结果与拆卸实验辨识结果一致。Aiming at the rippling on CNC lathe boring that inspecting step by step and confirming the rippling source preliminarily.Applying the float chuck fixture to improve the spindle rigidity and decrease the depth of the lathe tool indirectly which approve the rippling and spindle irrelevantly.Applying the envelope demodulation analysis method,by apply the LC-810 vibration signal acquisition analyzer to pick the vibration signal on front-end and back-end of spindle,the average data at 22.37 Hz and 45.94 Hz,which approach to the 22.127 Hz and 44.792 Hz of NN3048 and NU1038 bearing fault character frequency.Through the dismantle bearing and boring test that testify envelope demodulation analysis method is available on bearing fault diagnose.The result is the abrasion between NN3048 bearing and NU1038 outer race is the source of rippling,the theory and test result is consistent.

关 键 词：数控车床 包络解调分析法 振纹分析 故障特征频率 

分 类 号：TH17[机械工程—机械制造及自动化]