13 October 2006 A machine vision system for micro-EDM based on linux
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Proceedings Volume 6280, Third International Symposium on Precision Mechanical Measurements; 62803K (2006) https://doi.org/10.1117/12.716311
Event: Third International Symposium on Precision Mechanical Measurements, 2006, Urumqi, China
Abstract
Due to the high precision and good surface quality that it can give, Electrical Discharge Machining (EDM) is potentially an important process for the fabrication of micro-tools and micro-components. However, a number of issues remain unsolved before micro-EDM becomes a reliable process with repeatable results. To deal with the difficulties in micro electrodes on-line fabrication and tool wear compensation, a micro-EDM machine vision system is developed with a Charge Coupled Device (CCD) camera, with an optical resolution of 1.61μm and an overall magnification of 113~729. Based on the Linux operating system, an image capturing program is developed with the V4L2 API, and an image processing program is exploited by using OpenCV. The contour of micro electrodes can be extracted by means of the Canny edge detector. Through the system calibration, the micro electrodes diameter can be measured on-line. Experiments have been carried out to prove its performance, and the reasons of measurement error are also analyzed.
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Rui Guo, Wansheng Zhao, Gang Li, Zhiyong Li, Yong Zhang, "A machine vision system for micro-EDM based on linux", Proc. SPIE 6280, Third International Symposium on Precision Mechanical Measurements, 62803K (13 October 2006); doi: 10.1117/12.716311; https://doi.org/10.1117/12.716311
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