3D digitizing path planning for part inspection with laser scanning

If the first work relating to the automation of the digitalization of machine elements goes back to approximately 25 years, the process of digitalization of parts with non-contact sensor remains nevertheless complex. It is not completely solved today, in particular from a metrological point of view. In this article, we consider the determination of the trajectory planning within the framework of the control of dimensional and geometrical specifications. The sensor used in this application is a laser planner scanner with CCD camera oriented and moved by a CMM. For this purpose, we have focused on the methodology used to determine the best possible viewpoints which will satisfy the digitizing of a mechanical part. The developed method is based on the concept of visibility: for each facet of a part CAD Model (STL) a set of orientations, called real visibility chart, is calculated under condition of measurement uncertainties. By application of several optimisation criteria, the real visibility chart is reduced to create a viewpoint set from which the path planning is built.

[1]  Seokbae Son,et al.  Automated laser scanning system for reverse engineering and inspection , 2002 .

[2]  Flavio Prieto.  Métrologie assistée par ordinateur : apport des capteurs 3D sans contact , 2000 .

[3]  Kwan H. Lee,et al.  Automated inspection planning of free-form shape parts by laser scanning , 2000 .

[4]  Jean-François Fontaine,et al.  Taking Digitised Points Quality into Account in Geometrical Specification Measurement by Laser Sensor , 2004 .

[5]  Alexandre Contri.  Qualité géométrique de la mesure de surfaces complexes par moyens optiques , 2002 .

[6]  Colin Bradley,et al.  Automated laser scanning based on orthogonal cross sections , 1996 .

[7]  Jean-François Fontaine,et al.  Parameters Analysis Influencing 3D Measurement without Contact by Laser Scanner to Make a Compensation Model , 2005 .

[8]  Aristides A. G. Requicha,et al.  Accessibility analysis for the automatic inspection of mechanical parts by coordinate measuring machines , 1990, Proceedings., IEEE International Conference on Robotics and Automation.

[9]  C. P. Lim,et al.  CMM feature accessibility and path generation , 1994 .

[10]  Tony DeRose,et al.  Surface reconstruction from unorganized points , 1992, SIGGRAPH.

[11]  Deborah J. Medeiros,et al.  Part orientations for CMM inspection using dimensioned visibility maps , 1998, Comput. Aided Des..

[12]  Lester A. Gerhardt,et al.  View planning for verification using machine vision , 1994, Proceedings of 1st International Conference on Image Processing.

[13]  Suk-Hwan Suh,et al.  Machinability and set-up orientation for five-axis numerically controlled machining of free surfaces , 1997 .