Effects of Laval Nozzle on Precision Micro Cutting of Thin Metal Plate by Pulsed YAG Laser
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- OKAMOTO Yasuhiro
- 岡山大学工学部
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- UNO Yoshiyuki
- 岡山大学工学部
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- MURAKAMI Yoshihumi
- 三菱重工業 (株)
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- HOSOGAYA Masayoshi
- 岡山大学大学院
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- MIYANAGI Naoki
- 日立建機 (株)
Bibliographic Information
- Other Title
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- YAGレーザを用いた薄板の精密切断加工におけるラバルノズルの効果
- YAG レーザ オ モチイタ ウスイタ ノ セイミツ セツダン カコウ ニ オケル ラバルノズル ノ コウカ
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Abstract
The stagnation pressure, which is the sum of static and dynamic pressures, has a great influence on machining performance in laser cutting. Therefore, increasing the velocity of assist gas is effective in reducing the height of dross. In this paper, Laval nozzle was newly designed, because it can increase the velocity of assist gas flow spouted from nozzle tip. Effects of Laval nozzle on assist gas flow and the machining results in precision cutting of thin metal plate by a 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 a workpiece increases, since assist gas flow from Laval nozzle can utilize energy more efficiently. However, caution is necessary in setting the cylinder gas pressure, since Laval nozzle has many unstable regions, where the pressure on the workpiece changes periodically. Using Laval nozzle makes it possible to reduce the height of dross even under low cylinder gas pressure condition compared to convergent nozzle. Thus the consumption of flow quantity of assist gas can be reduced, when the same height of dross is desired. Moreover, it was pointed out that the convexed inner wall of nozzle leads to the reduction of dross generation and unstable region.
Journal
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- Journal of the Japan Society for Precision Engineering, Contributed Papers
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Journal of the Japan Society for Precision Engineering, Contributed Papers 70 (3), 433-437, 2004
The Japan Society for Precision Engineering
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Keywords
Details 詳細情報について
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- CRID
- 1390001205281058304
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- NII Article ID
- 110001823964
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- NII Book ID
- AA11966630
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- ISSN
- 18818722
- 13488716
- 13488724
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- NDL BIB ID
- 7072783
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed