Abstract
Optical measurement techniques such as laser scanning, structured light scanning and photogrammetry can be used for accurate shape control for aluminum extrusion and downstream processes. The paper presents the fundamentals of optical shape measurement. Furthermore, it focuses on how full‐field in‐ and off‐line shape measurement during pure‐bending of aluminum extrusions has been performed with stripe projection (structured light) using white light. Full field shape measurement is difficult to implement industrially, but is very useful as a laboratory tool. For example, it has been clearly shown how moderate internal air pressure (less than 5 bars) can significantly reduce undesirable cross‐sectional shape distortions during pure bending, and how buckling of the compressive flange occurs at an early stage. Finally, a stretch‐bending set‐up with adaptive shape control using internal gas pressure and optical techniques is presented.
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