Surface Inspection System for Large Sheet Metal Parts
In this paper a measuring system that allows an automatic detection of waviness and form errors in sheet metal parts is introduced. The system is based on a stripe projection method using a high resolution line scan camera. Particular focus is put on achieving a short measuring time and a high resolution in depth, aiming at a reliable automatic recognition of dents and waviness of 10 µm on large curved surfaces of approximately 1 m width. On smoothly curved surfaces a spatial frequency analysis is used to detect dents. By combining this spatial frequency analysis with a CAD model, more complex parts can be inspected, too. Using an objective 100% inspection of all parts, a quality improvement can be achieved by controlling the forming process.
M. Geiger, J. Duflou, H.J.J. Kals, B. Shirvani and U.P. Singh
B. Denkena et al., "Surface Inspection System for Large Sheet Metal Parts", Advanced Materials Research, Vols. 6-8, pp. 559-564, 2005