- 學位論文
PCB雕刻機之結構動態分析與改善研究
Structural Dynamic Analysis and Improvement of A PCB Prototyping Machine
摘要
本文主要在探討PCB雕刻機之結構動態特性，首先使用有限元素分析求解結構之模態振型，並分析在主軸運轉範圍內之共振頻率。在動態實驗部分，使用雷射干涉儀量測結構在主軸運轉下之頻率響應。藉由有限元素分析所得之模態振型與主軸之頻譜對照，分析主軸與結構產生共振之頻率。最後運用聲壓量測與雷射干涉儀量測之頻譜比對，驗正量測數據之準確性。經由實驗分析結果發現，原始設計之結構自然頻率與主軸其中之運轉頻率相近，有共振現象發生。 因此修正結構設計，增加結構自然頻率，並重新分析與實驗，證明結構修正後，共振現象有顯著改善。藉由有限元素分析並運用振動與聲壓量測，能在結構修正與設計上提供參考依據。本研究對於PCB鑽孔與雕刻之製程品質提升上有所幫助。
並列摘要
This study discusses the structural dynamic characteristics of the PCB prototyping machine. First of all, we proceed the FEM analysis to solve the mode shapes of the structure and analyze the resonant frequency of the spindle operating range. In the dynamic experiment, to use a laser interferometer to measure the frequency response of the structure of the spindle operation. By comparing the results of the mode shapes which FEA analyzed with the spectrum of the spindle, to analyze the resonant frequency of the spindle and the structure. Finally, to measure the value of the sound pressure and to compare the value with the spectrum which the laser interferometer measured. To confirm the correctness of the experiment data. The experiment results showed that a natural frequency of the PCB prototyping machine is close to the frequency of the specific speed of the spindle that can cause the resonance phenomenon. Therefore, to modify the structure to increase the natural frequency of the structure. To analyze and experiment on the structure again. The results showed the resonance phenomenon was improved evidently. By the FEA analysis, the vibration and the sound pressure measurements can offer a reference in structural modification and design this study is helpful to improve the quality of process for PCB drilling and carving.