Complete Supervision of Grinding Quality on Flat Glass Sheets

Peter Handschack

For quality control of ground edges of flat glass sheets, a time consuming inspection process is necessary. In most cases, workers do inspect for chipping, fissures and depth of grind on the production line. Main disadvantages of this approach are such as high error rate and long duration.

An image processing system has been developed, which can be integrated in the production line. A roller guides the system along the edge of the glass. The integrated matrix cameras do send a continuous stream of images to the attached computer. The smallest of the deviations from the ideal grinding contour (< 0,1 mm) are detected. The precise assignment of defects to top or underside of the glass sheet does assure optimal mapping.

A statistical function, makes an instantaneous analysis of the grinding process possible and assures a complete, inline assessment of the grinding machine and the quality of the grinding tool. The system is applicable to complicated curves as well as profiles.

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