| Summary: | 碩士 === 國立臺灣海洋大學 === 機械與機電工程學系 === 102 === Microdrills are precise cutting tools numerously used for micro-hole machining of printed circuit boards. Because of the tiny size of microdrills and the complicated geometry of the drill body, dimensional values of the cross-sectional web thickness and the cross-sectional outer diameter that influence the cross-sectional geometric accuracy of a microdrill cannot be easily measured. Thus, this thesis aims at developing a destructive measurement automation system to precisely measure the cross-sectional web thickness and outer diameter of microdrills. Functions of motion control, logic control, machine vision, image processing and geometric calculation must be integrated in the automation system to achieve the automated measurement of the cross-sectional web thickness and outer diameter of microdrills. Firstly, through the use of quality function development method and TRIZ, conceptual innovation design of the hardware of the automation system was preformed. Secondly, practical engineering specification design and analysis of the required hardware modules were preformed and a complete hardware system was accordingly built. Furthermore, measuring principles required for the automation system, including the drilltip positioning method, the image auto-focusing method, the cross-sectional web thickness measuring method and the cross-sectional outer diameter measuring method, were developed. Then, system integration and human-machine interface programming were carried out, and a complete procedure for the automated measurement was established. Finally, practical experiments for verification were conducted. From the experimental results, the developed system achieved a repeatability of 1.6 um and an accuracy of 2.5 um for the cross-sectional web thickness measurement, and achieved a repeatability of 1.1 um and an accuracy of 2.0 um for the cross-sectional outer diameter measurement. Therefore, the developed destructive measurement automation system can achieve precise and automated measurement for the cross-sectional web thickness and outer diameter of microdrills with high repeatability and accuracy.
|
|---|
