On the Study of Milling Chatter
| Autor: | Yi-Wen Qiu, 邱奕文 |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 Milling has played an important role in the machining process. During the milling operation, the tool and the workpiece generate relative oscillations which affect the cutting depth, render unsettled cutting force and make the milling dynamics unstable. This kind of self-generating vibration called “chatter” has an intimate correlation with certain machining parameters such as spindle speed, feed rate, radial and axial depth of cut, and workpiece material. Chatter is often accompanied by the deviation of cutting depth, incomplete surface finish and high-pitch noise. To prevent the onset of machining chatter, people usually resort to the stability lobe diagram to setup machining parameters. However, the accuracy of the stability lobe diagram depends on several factors like cutting coefficients, tool wear, process damping and so on, rendering optimized machining parameters unavailable, and currently there are no efficient solutions to verify the accuracy of the stability lobe diagram. This study first developed a stability lobe diagram by conducting the impact test, followed by constructing a milling dynamic model to predict the cutting force. Multiple combinations of spindle speed and depth of cut were investigated to discuss milling chatter. In order to validate the dynamic model, a force sensor was mounted to measure the cutting force, and the time-frequency analysis method was used to observe the cutting vibration in time- and frequency-domain. As a result the difference of the cutting force generated by the simulation and the milling experiment was verified. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|