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1989 Fiscal Year Final Research Report Summary

RESEARCH DEVELOPMENT OF JET CUTTING PROCESSING.

Research Project

Project/Area Number 63850037
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field Fluid engineering
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

KOBAYASHI Ryoji  Tohoku Univ., Faculty of Engineering, Professor, 工学部, 教授 (70006170)

Co-Investigator(Kenkyū-buntansha) IBUKI Seita  Dengyosha Machine Works, LTD, Head of Section, 技術企画課長
SHOJI Tetsuo  Tohoku Univ., Faculty of Engineering, Professor, 工学部, 教授 (80091700)
TAKAYAMA Kazuyoshi  Tohoku Univ., Inst. of Fluid Science, Professor, 流体科学研究所, 教授 (40006193)
SHIMA Akira  Tohoku Univ., Inst. of Fluid Science, Professor, 流体科学研究所, 教授 (30006168)
Project Period (FY) 1988 – 1989
KeywordsFluid Mechanics / Jet / Water Jet / Cutting Processing / Impact Fracture / Nozzle / Multiphase Flow
Research Abstract

The following research was carried out to make the water jet technology in practical use.
1. Jet Cutting Robot A robot for jet cutting was designed and manufactured. A nozzle head issuing a high speed water jet can be traversed in three-dimensional directions at definite speed, which is computer-controlled. Test materials are processed in arbitrary shape by the water jet issued vertically.
2. Development of High Performance Nozzle The design of the contraction nozzle issuing the high speed water jet is one of the important factors which influence the cutting performance directly. We therefore found experimentally the most suitable profile of the nozzle inner surface after many tests in a wide range of the main parameters determining the nozzle profile. It was also clarified that the finishing accuracy of the cylindrical inner surface near the nozzle exit is related very sensitively to the structure of the water jet and also the stable performance of cutting process.
3. Structure of Water Jet The structure of the water jets issued from some test contraction nozzles and orifices was compared in detail by using a shadow photograph method of 0.8mus flash time. It was also found that the addition of polyner into water suppresses remarkably the atomization of the water jet and increases the cutting performance about 3.7 times in a case of 1000 ppm compared with a pure water jet.
4. Mechanism of Cutting Process by Water Jet It was made clear that the mechanism of the water jet cutting is the water hammer phenomenon occurred by the water drop impact and the impacting fracture of the solid material. In the case of abrasive jet which is mixed abrasives with water jet, the high speed impact of the solid particles causes mainly the cutting process. We found that the supersonic air jet has a possibility as cutting tool for soft solid materials.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 小林陵二: "Local Structure of water Jet and Related Erosion Process of Metallic Materials." Proceedings of the 9th International Symposium on Jet Cutting Technology,Sendai,Japan. 155-163 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小林陵二: "ウォ-タ-ジェットの局所構造と金属材料の壊食機構" 日本機械学会論文集、B編. 56. 67-73 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小林陵二: "Water Jet Nozzle Geometry and Its Effects on Erosion Process of Metallic Material." Proceedings of the 5th American Water Jet Comference Toronto,Canada. 59-68 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小林陵二: "Jet Cutting Characteristis and Finishing Accuracy of Water Jer Nozzle" Peoceedings of the 2nd Pacific Rim International Comference on Water Jet Cutting,Singapore. 30-37 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小林陵二: "アブレシブジェット加工の基礎的研究" 日本機械学会東北支部第25期総会講演会講演概要集. No.901-1. 44-45 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小林陵二: "エアジェットによる材料加工の研究" 日本機械学会東北支部第25期総会講演会講演概要集. No.901-1. 46-47 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R. Kobayashi: "Local Structure of Water Jet and Related Erosion Process of Metallic Materials" Proc. of 9th Int. Symp. on Jet Cutting Technology, Sendai, 155-163, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R. Kobayashi: "Water Jet Structure and Erosion Mechanism of Metallic Materials" Transactions of the Japan Society of Mechanical Engineers, Series B, Vol.56, 67-73, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R. Kobayashi: "Water Jet Nozzle Geometry and Its Effects on Erosion Process of Metallic Material" Proc. of 5th American Water Jet Conf., Tronto, Canada, 59-68, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R. Kobayashi: "Jet Cutting Characteristics and Finishing Accuracy of Water Jet Nozzle" Proc. of 2nd Pacific Rim Int. Conf. on Water Jet Cutting, Singapore, 30-37, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R. Kobayashi: "Studies on Abrasive Jet Processing" Proc. of 25th General Meeting at the Tohoku Branch of the Japan Society of Mechanical Engineers, No.901-1, 44-45, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R. Kobayashi: "An Experiment on Processing of Materials by Air Jet" Proc. of 25th General Meeting at the Tohoku Branch of the Japan Society of Mechanical Engineers, No.901-1, 46-47, 1990.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-26  

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