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COMPOSITE TECHNOLOGIES FOR INTELLIGENT INDUSTRIAL LASER PROCESSING

Philips Centre for Industrial Technology. COMPOSITE TECHNOLOGIES FOR INTELLIGENT INDUSTRIAL LASER PROCESSING. prof. VINCENZO PIURI Department of Information Technologies, University of Milan via Bramante 65, 26013 Crema (CR), Italy.

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COMPOSITE TECHNOLOGIES FOR INTELLIGENT INDUSTRIAL LASER PROCESSING

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  1. Philips Centre for Industrial Technology COMPOSITE TECHNOLOGIES FOR INTELLIGENT INDUSTRIAL LASER PROCESSING prof. VINCENZO PIURIDepartment of Information Technologies, University of Milanvia Bramante 65, 26013 Crema (CR), Italy prof. VINCENZO PIURIDepartment of Information Technologies, University of Milanvia Bramante 65, 26013 Crema (CR), Italy EU Project SLAPSSelf-Tuning and User-Independent Laser Material Processing Units

  2. Information SourcesPartners in IMS/Brite-Euram Project SLAPS Philips-CFT Laser Zentrum Hannover Odense Steel Shipyard LTD. Jurca Opto-elektronik Fiat-CRF Trumpf Lasag AG Politecnico di Milano Ecole Politechnique Federale de Lausanne - IOA University of Vienna Contributions to the Tutorial: Prof. Cesare Alippi, Politecnico di Milano, Italy Dr. Toon Bloom, Philips CFT, The Netherlands

  3. Laser seam welding Laser cutting Laser spot welding Laser drilling Laser cladding Laser marking Laser adjustment …... Laser ProcessingApplying energy to a work piece in the form of (high intensity) light beam

  4. Carbon Dioxide LaserTypical gas laser construction

  5. Nd:YAG Laser

  6. Solid State Laser Diode

  7. Solid State Laser Diode • Low output power • Laser diode arrays for processing • Low beam quality • Good control qualities • High efficiency

  8. Beam Delivery

  9. Beam Delivery

  10. Absorption, Reflection, Transmission • Kirchhoff: Absorption +reflection+transmission = 1 • Extinction of the penetrating light wave • Penetration depth:

  11. a D Stainless steel Temperature Absorption and Heat Diffusion = F(T)

  12. Process Phases • 1: Heating: Absorption, heat diffusion • 2: Phase transition of top material, change of properties • 3: Vaporisation, recoil pressure pushes liquid metal aside • 4: Liquid level reaches bottom and is blown out

  13. Laser Cutting • Medium to high power CW lasers (CO2) • Process gas, reactive (O2. extra reaction energy) or not (N2), to blow out molten material • Wave guide kind of energy transfer through the cutting slit

  14. Spark Pattern During Laser Cutting

  15. Process Monitoring

  16. Laser Seam Welding

  17. Laser Seam Welding • Battery casings, Pace maker casings • Car bodies, Transmission parts • Sub assemblies in ship building • Plastics (overlap penetration welding)

  18. Laser Seam WeldingProcess monitoring - Direct delivery system

  19. Laser Seam Welding Process monitoring - Fibre delivery system Sensing implemented in processing head

  20. Spot Weld Geometries

  21. ProcessMonitoringin spot welding

  22. Signal ProcessingExample of measured signals

  23. Signal ProcessingExample of measured signals

  24. Automatic Classificationbased on multi sensor process monitoring • The complete set of sensors provides a broad information range about the performance of the process • Realisation of data reduction by extraction of specific features from the recorded signals • The features are recognised as being related to certain process events • The relations between features and a good or bad performing process have to be established through a large set of verification experiments

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