In-Process Monitoring of Changing Dynamics of a Thin-Walled Component During Milling Operation by Ball Shooter Excitation

被引:11
作者
Bachrathy, Daniel [1 ]
Kiss, Adam K. [1 ]
Kossa, Attila [2 ]
Berezvai, Szabolcs [2 ]
Hajdu, David [1 ,2 ]
Stepan, Gabor [2 ]
机构
[1] MTA BME Lendulet Machine Tool Vibrat Res Grp, H-1111 Budapest, Hungary
[2] Budapest Univ Technol & Econ, Dept Appl Mech, H-1111 Budapest, Hungary
来源
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING | 2020年 / 4卷 / 03期
基金
欧洲研究理事会; 匈牙利科学研究基金会;
关键词
ball shooter; natural frequencies; milling; thin-walled; in-process; online; CHATTER STABILITY; PREDICTION; IDENTIFICATION; BEHAVIOR; ERROR; TESTS;
D O I
10.3390/jmmp4030078
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
During the milling of thin-walled workpieces, the natural frequencies might change radically due to the material removal. To avoid resonant spindle speeds and chatter vibration, a precise knowledge of the instantaneous modal parameters is necessary. Many different numerical methods exist to predict the changes; however, small unmodelled effects can lead to unreliable results. The natural frequencies could be measured by human experts based on modal analysis for an often interrupted process; however, this method is not acceptable during production. We propose an online measurement method with an automatic ball shooter device which can excite a wide frequency range of the flexible workpiece. The method is presented for the case of blade profile machining. The change of the natural frequencies is predicted based on analytical models and finite element simulations. The measurement response for the impulse excitation of the ball shooter device is compared to the results of impulse modal tests performed with a micro hammer. It is shown that the ball shooter is capable of determining even the slight variation of the natural frequencies during the machining process and of distinguishing the slight change caused by different clamping methods. An improved FE model is proposed to include the contact stiffness of the fixture.
引用
收藏
页数:16
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