Optical device for the improvement of positioning accuracy in large machine tools (Contributo in atti di convegno)

Type
Label
  • Optical device for the improvement of positioning accuracy in large machine tools (Contributo in atti di convegno) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1117/12.2020288 (literal)
Alternative label
  • Cocola L.; Fedel M.; Mocellin M.; Casarin R.; Poletto L. (2013)
    Optical device for the improvement of positioning accuracy in large machine tools
    in SPIE Optical Metrology 2013, Monaco (Germania), 13-16 maggio 2013
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Cocola L.; Fedel M.; Mocellin M.; Casarin R.; Poletto L. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84880759534&partnerID=q2rCbXpz (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 8788 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#volumeInCollana
  • 8788 (literal)
Rivista
Note
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • National Council for Research of Italy, Institute of Photonics and Nanotechnologies, Via Trasea 7, 35131 Padova, Italy; FPT Industrie S.P.A., Via Enrico Fermi 18, 30036 S. Maria di Sala (VE), Italy (literal)
Titolo
  • Optical device for the improvement of positioning accuracy in large machine tools (literal)
Abstract
  • The very large machine tools now available for applications ranging from aerospace to composite material castings present a new set of challenges when trying to match the traditional machining accuracies of the mechanical workshop. An optical system for the automatic recalibration of the machine during the machining process has been developed. While conventional linear and rotary optical encoders are used to control axes positioning, and their resolution is already more than compliant with the needed accuracies, our optical system provides a further error signal during operation in order to compensate for structural deformations of axis and sliding parts. Those signals are used in order to reach a global positioning error vector under 50 microns on a 3-axis translation stage. The system has been installed on a test machine, with a total range on the 3-axis of 3, 1.6 and 1.2 meters. The device increases ranging measurement accuracy by decreasing the dependence of the position to the temperature variation and other deformations. To achieve such results, collimated diode lasers and 2D position-sensing devices have been installed to the machine. In order to provide signals which are least affected by electrical noise, transimpedance amplifiers and analog to digital converters have been integrated close to the detectors. The tests performed on the prototype demonstrate the capability of mapping the actual distance from the ideal linear translation with an error of 25 um along the full axis travel for a tracing capability of ±3.5 mm in both directions on each of the three detectors. This result is within the requirements of the end users, manufactures of travelling column type boring and milling machines. © 2013 SPIE. (literal)
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