소성∙가공 (Transactions of Materials Processing)

  • 제27권1호
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  • Pages.18-27
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  • 2018
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  • 1225-696X(pISSN)
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  • 2287-6359(eISSN)
한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
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대면적 후곡판 성형을 위한 블랭크 지지구조 설계

Design of Blank Support Structure for Large and Curved Thick Plate Forming

  • 투고 : 2017.11.01
  • 심사 : 2017.12.27
  • 발행 : 2018.02.01
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초록

As one of the functional metal parts in steam turbine diaphragm assembly, the hollow-partitioned turbine nozzle (stator) has large and thick geometries, as well as an asymmetric configuration. Therefore it is hard to support a metal blank in the die cavity. To ease this situation and control posture and position of metal blank (workpiece), a blank support structure is newly introduced. The blank support structure is basically composed of enlarged arms from the blank, guide pins and linear bearings. It can help to control the intermediate blank without a critical sliding phenomenon. The operation mechanism of this blank support structure, during thick plate forming for the hollow-partitioned turbine nozzle stator, is first evaluated. A series of FEM-based numerical simulations, with respect to the width of the guide arm as geometric design parameters, are carried out to investigate its applicable range. As the results, it is observed the blank support structure for this thick plate forming can guide the workpiece to have stable posture during the plate forming process.

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참고문헌

  1. B. Stanisa, V. Ivusic, 1995, Erosion Behavior and Mechanisms for Steam Turbine Rotor Blades, Wear, Vol. 186-187, pp. 395-400. https://doi.org/10.1016/0043-1648(95)07136-9
  2. B. E. Lee, K. J. Riu, S. H. Shin, S. B. Kwon, 2003, Development of a Water Droplet Erosion Model for Large Steam Turbine Blades, J. Mech. Sci. Technol., Vol. 17, No. 1, pp. 114-121.
  3. B. K. Kang, B. S. Kwak, M. J. Yoon, J. Y. Jeon, B. S. Kang, T. W. Ku, 2016, Tool Design and Numerical Verification for Thick Plate Forming of Hollow-Partitioned Steam Turbine Nozzle Stator, Trans. Mater. Process., Vol. 25, No. 6, pp. 379-389. https://doi.org/10.5228/KSTP.2016.25.6.379
  4. S. C. Heo, Y. H. Seo, T. W. Ku, B. S. Kang, 2010, A Study on Thick Plate Forming using Flexible Forming Process and Its Application to a Simply Curved Plate, Int. J. Adv. Manuf. Technol., Vol. 51, No. 1-4, pp. 103-115. https://doi.org/10.1007/s00170-010-2615-5
  5. W. B. Schramm, A. J. Nachtigall, V. L. Arne, 1950, Preliminary Analysis of Effects of Air Cooling Turbine Blades on Turbojet-Engine Performance, National Advisory Committee of Aeronautics, NACA-RME50E22.
  6. R. Hill, 1948, A Theory of the Yielding and Plastic Flow of Anisotropic Metals, Proc. Roy. Soc. A, Vol. 193, No. 1033, pp. 281-297. https://doi.org/10.1098/rspa.1948.0045
  7. K. J. R. Rasmussen, T. Burns, P. Bezkorovainy, M. R. Bambach, 2003, Numerical Modelling of Stainless Steel Plates in Compression, J. Constr. Steel Res., Vol. 59, No. 11, pp. 1345-1362. https://doi.org/10.1016/S0143-974X(03)00086-5
  8. T. W. Ku, B. S. Kang, J. Y. Jeon, M. J. Yoon, 2017, Thick plate support structure having large surface for blade, Korean Intellectual Property Office, No. 10-2017-0116604.
  9. T. W. Ku, B. S. Kang, J. Y. Jeon, M. J. Yoon, 2017, The thick plate forming apparatus having large surface for blade, Korean Intellectual Property Office, No. 10-2017-0116607.