513 Effect of Laval Nozzle in Precision Cutting of Thin Metal Plate by Pulsed YAG Laser

• Okamoto Y.

  Okayama University

• Uno Y.

  Okayama University

• Hosogaya M.

  Okayama University

• Miyanagi N.

  Hitachi Construction Machinery Co., Ltd.

抄録

Effects of Laval nozzle on assist gas flow and the machined results in precision cutting of thin plate by pulsed YAG laser were experimentally investigated. Assist gas flow from Laval nozzle does not have Mach Shock Disk, and goes more straight than a traditional convergent nozzle. Therefore, the pressure on workpiece increases, since assist gas flow from Laval nozzle can utilize energy more efficiently. However, caution is necessary in setting of cylinder gas pressure, since Laval nozzle has many unstable regions in which the pressure on workpiece changes periodically. Using Laval nozzle makes it possible to reduce the height of dross even under low cylinder gas pressure condition. Thus the consumption of assist gas flow quantity can be reduced. Moreover, it was pointed out that the convexed inner wall of nozzle leads of reduction of dross generation.

収録刊行物

• Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21

  Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2003 (0), 915-920, 2003

  一般社団法人 日本機械学会

キーワード

• YAG laser
• Dross generation
• Laval nozzle
• Assist gas flow
• Schlieren method
• Mach shock disk

詳細情報

• CRID: 1390001205899978880
• NII論文ID: 110002498445
• DOI: 10.1299/jsmelem.2003.915
• ISSN: 24243086
• Web Site: https://www.jstage.jst.go.jp/article/jsmelem/2003/0/2003_915/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可