YAGレーザを用いた薄板の精密切断加工に及ぼすノズル形状の影響

• 岡本 康寛

  岡山大学工学部

• 宇野 義幸

  岡山大学工学部

• 村上 義文

  三菱重工業 (株)

• 細萱 正義

  岡山大学大学院

• 三柳 直毅

  日立建機 (株)

書誌事項

タイトル別名

• Effects of Nozzle Shape on Precision Micro Cutting of Thin Metal Plate by Pulsed YAG Laser

抄録

In YAG laser cutting process of thin plate, it is important to understand the assist gas flow from the tip of a convergent nozzle in order to improve the machining accuracy, since melted material is mostly carried away downward by the gas flow. Besides, it is considered that the nozzle shape influences the assist gas flow. In this paper, the effects of the nozzle shape on assist gas flow and machining results in micro machining by a pulsed YAG laser are experimentally investigated. There is an unstable region where the pressure on a workpiece changes periodically regardless of the internal shape and exit diameter of nozzle. The unstable region starts at low cylinder gas pressure and becomes smaller in range with increasing the exit diameter. Under middle and high cylinder gas pressure conditions over 300kPa, height of dross becomes smaller with the increase of the exit diameter for a nozzle of conical internal shape, since the pressure on workpiece increases. Furthermore, when the conical inner wall of nozzle is changed to a convex inner wall, it is possible to reduce the height of dross. Additionally, the height of dross becomes lower, when the curvature of the inner wall increases under the high pressure condition.

収録刊行物

• 精密工学会誌論文集

  精密工学会誌論文集 70 (2), 246-250, 2004

  公益社団法人 精密工学会

キーワード

• nozzle shape
• assist gas flow
• dross
• precision cutting
• YAG laser
• Schlieren method
• Mach shock disk

詳細情報

• CRID: 1390282680257622912
• NII論文ID: 130002102948
• DOI: 10.2493/jspe.70.246
• ISSN: 18818722
• ISSN: 13488724
• 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