Effect of nozzle shape on surface integrity in micro cutting with pulsed YAG laser

Yasuhiro Okamoto, Yoshiyuki Uno, Naoki Miyanagi

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

Abstract

YAG laser has widely been used for precision micro machining in many fields. However, adhesions of dross and spatter to the base material due to high energy beam machining lead to the deterioration of the surface integrity. It is important to understand the assist gas flow from the tip of a convergent nozzle in order to improve the surface integrity, since material is mostly removed away by the gas flow spouted in the same direction of the laser beam. In this paper, effects of the nozzle shape on assist gas flow and the machined results were experimentally analyzed using the Schlieren method. There exists an unstable region in which the pressure on the workpiece changes periodically, and the region becomes wider with the reduction of the exit diameter. The pressure on the workpiece increases with an increase of the exit diameter, which makes the dross height smaller. However, it is necessary to select the nozzle shape according to the demand of the surface integrity, because the consumption of the assist gas increases and the kerf width becomes wider with an increase of the exit diameter. Moreover, it was pointed out that a kind of nozzle with a convex curve on inner wall of nozzle led to better surface integrity.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
Pages291-294
Number of pages4
Volume4088
DOIs
Publication statusPublished - 2000
Event1st International Symposium on Laser Precision Microfabrication - Omiya, Jpn
Duration: Jun 14 2000Jun 16 2000

Other

Other1st International Symposium on Laser Precision Microfabrication
CityOmiya, Jpn
Period6/14/006/16/00

Fingerprint

Pulsed lasers
integrity
nozzles
YAG lasers
Nozzles
pulsed lasers
gas flow
Flow of gases
machining
convergent nozzles
Machining
deterioration
adhesion
Laser beams
laser beams
Deterioration
Adhesion
curves
gases
Lasers

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Okamoto, Y., Uno, Y., & Miyanagi, N. (2000). Effect of nozzle shape on surface integrity in micro cutting with pulsed YAG laser. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4088, pp. 291-294). Society of Photo-Optical Instrumentation Engineers. https://doi.org/10.1117/12.405759

Effect of nozzle shape on surface integrity in micro cutting with pulsed YAG laser. / Okamoto, Yasuhiro; Uno, Yoshiyuki; Miyanagi, Naoki.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4088 Society of Photo-Optical Instrumentation Engineers, 2000. p. 291-294.

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

Okamoto, Y, Uno, Y & Miyanagi, N 2000, Effect of nozzle shape on surface integrity in micro cutting with pulsed YAG laser. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 4088, Society of Photo-Optical Instrumentation Engineers, pp. 291-294, 1st International Symposium on Laser Precision Microfabrication, Omiya, Jpn, 6/14/00. https://doi.org/10.1117/12.405759
Okamoto Y, Uno Y, Miyanagi N. Effect of nozzle shape on surface integrity in micro cutting with pulsed YAG laser. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4088. Society of Photo-Optical Instrumentation Engineers. 2000. p. 291-294 https://doi.org/10.1117/12.405759
Okamoto, Yasuhiro ; Uno, Yoshiyuki ; Miyanagi, Naoki. / Effect of nozzle shape on surface integrity in micro cutting with pulsed YAG laser. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4088 Society of Photo-Optical Instrumentation Engineers, 2000. pp. 291-294
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