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Vibration Analysis of a Boring Bar
Responsible organisation
2002 (English)Report (Other academic)
Abstract [en]

In boring operations the vibrations are a cumbersome part of the manufacturing process. This report puts the vibrations under scrutiny and the vibrations were measured both in the cutting speed direction and the cutting depth direction. The cutting process seems to be a time varying process and contains nonstationary as well as nonlinear parameters that are not under control. The experiments showed that the vibrations were usually dominated by the first resonance frequency in either of the two directions of the boring bar. Sample probability density estimates of the vibration records points to that the probability densities are varying from sinusiodal probability shape to gaussian shape. They also indicate that shape of the two directions could be of different probability density function from the same vibration record. Stationarity tests show, besides that the processes usually are nonstationary, that it is possible to extract short time stationary segments within a vibration record. The problem with force modulation in rotary machinery, which appears as side band terms is the spectrum, is also addressed. Furthermore, the resonance frequencies of the boring bar are correlated to an approximate theoretical beam model. The theoretical calculation of the boring bar deflection corresponds well with the experimental results from the modal analysis and the operating deflection shape analysis.

Place, publisher, year, edition, pages
Blekinge Tekniska Högskola Forskningsrapport, ISSN 1103-1581 ; 1
Keyword [en]
Lathe, Vibration, Boring, Turning
National Category
Signal Processing
URN: urn:nbn:se:bth-00201Local ID: diva2:837635
Available from: 2012-09-18 Created: 2002-02-05 Last updated: 2015-06-30Bibliographically approved

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Signal Processing

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