A Study on the Performance of an Adjustable Vibration-Reduction Boring Bar
碩士 === 國立中興大學 === 機械工程學系所 === 96 === Vibration is one of the factors that affect the machining quality. Among many items, chatter is the most difficult item to control in vibration. It not only effect the life of machine tool and manufacturing quality but let manufacturer feel unwell for producing n...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2008
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| Online Access: | http://ndltd.ncl.edu.tw/handle/97261976312576783777 |
| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 96 === Vibration is one of the factors that affect the machining quality. Among many items, chatter is the most difficult item to control in vibration. It not only effect the life of machine tool and manufacturing quality but let manufacturer feel unwell for producing noise.This study is intended to investigate the system properties of an adjustable vibration-reduction boring bar. We first analyzed the structure and model of various vibration-reduction tool holders. The vibration characteristics, including the damping and the stiffness, and their relationship to the compression displacement of the adjustable vibration-reduction boring bar are then investigated via system identification approach. Models for damping and stiffness are then constructed based on experimental data with statistical regression by the analysis of variation. Further experiments are then conducted to verify these models.
The relationship between the damping C and the compression displacement x of the boring bar by this approach is identified as C=-0.029x3+0.407x2-2.20x+12.4. This model is further verified with average errors less than 2% at compression displacements 0.5mm, 2.5mm and 4.5mm. The stiffness K is identified as K=303x3-1940x2+8890x +181000 with average verification errors less then 1%. The damping of vibration-reduction system C2 is identified as -0.026x3+0.35x2-1.73x+4.19 with average verification errors less then 5%. The stiffness of vibration-reduction system K2 is identified as 121x3-932x2+4650x+4550 with average verification errors less then 7%. It concludes that the approach and models of the study are suitable to evaluate the damping and the stiffness of the adjustable vibration-reduction boring bar.
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