Shape measurement in sheet metal formation: requirements and solutions

Roland Hoefling; Petra Aswendt; Reimund Neugebauer

doi:10.1117/12.364271

21 September 1999 Shape measurement in sheet metal formation: requirements and solutions

Roland Hoefling, Petra Aswendt, Reimund Neugebauer

Proceedings Volume 3824, Optical Measurement Systems for Industrial Inspection; (1999) https://doi.org/10.1117/12.364271
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

Abstract

Basically, optical profilometry has a wide spread application potential in sheet metal forming starting at the design stage when models have to be digitized, followed by needs for shape acquisition in tooling technology, and finally in on-line testing during mass production. In particular, deep-drawing of car body components and surface structures of aircrafts put high demands on metrology. In the past, a number of restrictions caused application limits of optical 3D sensing in this field. The paper will show, that object size greater than 1 m, measuring time less than 1 s, vertical resolution less than 10^-4 of object size and the capability to work on shining, oil-covered metallic surfaces are key criteria for industrial applications. New approaches are described addressing these practical needs. Based upon high brightness, high contrast pixel by pixel projection equipment (Digital Micromirror Device of Texas Instruments Inc.), algorithms have been developed and tested that meet the objectives named above. Multilevel adaption generates near-to- perfect sinusoidal fringes across the field of view and advanced phase analysis improves both, measuring accuracy and reliability of operation. Fast data acquisition has been obtained by development of sophisticated synchronization hardware. An application example will be given showing surface structures on a large sheet metal part at two different scales of height.

Citation Download Citation

Roland Hoefling, Petra Aswendt, and Reimund Neugebauer "Shape measurement in sheet metal formation: requirements and solutions", Proc. SPIE 3824, Optical Measurement Systems for Industrial Inspection, (21 September 1999); https://doi.org/10.1117/12.364271

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