CONDITION MONITORING OF MICRO-DRILLING PROCESSES ON GLASS BY USING MACHINE VISION

摘要

Optical and medical devices require micro-drilling of holes on glass. Brittle fracture occurs during the drilling. Cone and radial cracks are generated due to impact load and walking when a drill hit a glass to make a hole. To produce good holes without cracks and fracture, a condition monitoring of glass drilling processes is required. In this paper, to develop a cost-effective direct monitoring system in micro-drilling processes on glass, a machine vision unit with the edge detection and 3D measurement functions is studied. It consists of a CCD camera with a zoom lens attached to the precision servo stage and a novel illumination unit. Performance of the developed machine vision system is verified in micro-drilling processes on glass using diamond and carbide drills.