Precision micro cutting of thin steel plate with newly designed laval nozzle by pulsed YAG laser

Yasuhiro Okamoto, Yoshiyuki Uno, Masayoshi Hosogaya, Naoki Miyanagi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper deals with laser cutting of thin steel plate by pulsed YAG laser using newly designed Laval nozzle. The assist gas flow spouted from the Laval nozzle dose not have Mach Shock Disk in free jet, and its straightness is superior to a traditional convergent nozzle. Therefore, the pressure on workpiece increases, and the dross height can be reduced remarkably even under low supply gas pressure condition. Thus, the consumption of flow quantity of assist gas can be reduced, when the dross height is equal. Besides, color change by excessive oxidation due to the heat conduction from dross is smaller at the back side of workpiece around the kerf, since Laval nozzle can remove melted material more effectively compared to a convergent nozzle. However, the supplied gas pressure should be carefully set, since Laval nozzle has many unstable regions, where the pressure on workpiece changes periodically. The dross height dose not increase or almost equal in the case of Laval nozzle, when the gap distance between the nozzle tip and the workpiece surface is changed from 1mm to 2mm. Because the assist gas flow from Laval nozzle has an excellent straightness and the pressure on workpiece does not reduce drastically. Moreover, it was made clear that Laval nozzle designed for the special condition can reduce the dross more effectively and decrease the unstable region.

Original languageEnglish
Title of host publicationICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings
PublisherLaser Institute of America
ISBN (Print)0912035773, 9780912035772
DOIs
Publication statusPublished - Jan 1 2004
EventICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics - San Francisco, CA, United States
Duration: Oct 4 2004Oct 7 2004

Publication series

NameICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings

Other

OtherICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics
CountryUnited States
CitySan Francisco, CA
Period10/4/0410/7/04

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Electrical and Electronic Engineering

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    Okamoto, Y., Uno, Y., Hosogaya, M., & Miyanagi, N. (2004). Precision micro cutting of thin steel plate with newly designed laval nozzle by pulsed YAG laser. In ICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings (ICALEO 2004 - 23rd International Congress on Applications of Laser and Electro-Optics, Congress Proceedings). Laser Institute of America. https://doi.org/10.2351/1.5060318