| Summary: | 碩士 === 國立臺灣海洋大學 === 機械與機電工程學系 === 103 === Microdrills are precise cutting tools numerously used for micro-hole drilling of printed circuit boards. Because the nominal diameters of microdrills are under 0.5 mm, and the geometry of the drill body is complicated, geometric dimensions of the cross-sectional outer diameter and the cross-sectional web thickness of microdrills that influence the drilling performance cannot be rapidly and accurately measured. Thus, this thesis aims at developing a rapid and non-destructive measurement automation system to precisely measure the cross-sectional outer diameter and the cross-sectional web thickness of microdrills. Technologies of precision machinery, motion control, logic control, optical measurement, machine vision and data acquisition must be integrated in the automation system to achieve the automated measurement of the cross-sectional geometric accuracy of microdrills. Firstly, an optical measuring method for the cross-sectional geometric accuracy of microdrills is constructed through the measuring principle of the optical micrometer, the feasibility of the optical measuring method is then simulated and verified by using SolidWorks® software. Secondly, based on the presented optical measuring method, the conceptual design and specification development of a measurement automation system were carried out, and a complete hardware machine of the measurement automation system was constructed, assembled and calibrated. 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 could achieve a measuring time less than 15 seconds for measuring a single cross-section of microdrill samples, and could achieve a repeatability of ±1.0 μm and an accuracy of ±2.0 μm for both the cross-sectional outer diameter measurement and the cross-sectional web thickness measurement. Therefore, the developed non-destructive measurement automation system can achieve automated measurement for the cross-sectional geometric accuracy of microdrills with high efficiency, high repeatability and high accuracy.
|
|---|
