Laser cut inspection

Real-time quality monitoring in laser cutting applications is a key issue in high-tech steel manufacturing industries. We have studied an automated system for intelligent quality analyses that acquires frames related to the temporal evolution of sparks generated by the interaction of the laser with the metal as well as process-related parameters and, on the basis of extracted features, judges the quality of the current cut. It has been demonstrated the existence of a relationship between the shape assumed by the sparks and the quality of the final cut. Based on such relationship, a quality analysis system has been designed, which integrates traditional image processing methods and soft-computing paradigms in order to control the balance between the accuracy of the quality analysis and the computational complexity (related to real-time constraints).

The research have been performed in collaboration with TRUMPF.

Schema of the researched system

Examples of images analyzed by the implemented system

  • C. Alippi, V. Bono, V. Piuri, F. Scotti, "Toward real-time quality analysis measurement of metal laser cutting", in Proc. of the 2002 IEEE Int. Symp. on Virtual and Intelligent Measurement Systems (VIMS 2002), Girdwood, AK, USA, pp. 39-44, May 19-20, 2002. ISBN: 0-7803-7344-8. [DOI: 10.1109/VIMS.2002.1009354][PDF]
  • V. Piuri, "Composite technologies for intelligent industrial laser processing", in Proc. of the 2002 ISA/IEEE Sensors for Industry Conf. (SICon 2002), Houston, TX, USA, pp. 270-282, November 19-21, 2002. ISBN: 1-55617-834-4. [DOI: 10.1109/SFICON.2002.1159839][PDF]
  • G. Roggero, F. Scotti, F. Soncini Sessa, V. Piuri, "Quality analysis measurement for laser cutting", in Proc. of the 2001 IEEE Int. Workshop on Virtual and Intelligent Measurement Systems (VIMS 2001), Budapest, Hungary, pp. 41-44, May 19-20, 2001. ISBN: 0-7803-6568-2. [DOI: 10.1109/VIMS.2001.924898][PDF]
  • C. Alippi, P. Braione, V. Piuri, F. Scotti, "A methodological approach to multisensor classification for innovative laser material processing units", in Proc. of the 2001 IEEE Instrumentation and Measurement Technology Conf. (IMTC 2001), Budapest, Hungary, pp. 1762-1767, May 21-23, 2001. ISBN: 0-7803-6646-8. [DOI: 10.1109/IMTC.2001.929503][PDF]