| Summary: | 碩士 === 國立中正大學 === 機械工程系研究所 === 104 === The thesis is divided into two parts. In the first part, the correlation between the workpiece roughness and the machine vibration is investigated. Experimental results show that the vibration transmissibility from the spindle to the work table correlates well to the workpiece roughness with a Pearson correlation coefficient larger than 0.9. In the second part, a methodology is presented to optimize the feed rate according to the machining dynamics. Traditionally the feed rate recommended by the tool supplier is an estimation which results from a balance in consideration between the tool life and cutting efficiency. However, this recommended feed rate does not take the machine dynamics into account. A machining quality index based on the vibration transmissibility is proposed as an objective in optimizing the feed rate. Experimental results show that with small amount of increase in vibration, the feed rate recommended by the tool supplier can be much increased, which implies that we may increase the material removal rate without affecting the tool life much.
|
|---|
