• Title/Summary/Keyword: flashless forging

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UBET Analysis on Precision Rib-Web Forgings (리브-웨브형 정밀단조에 관한 상계요소해석)

  • 이종헌;김영호;배원병
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.5
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    • pp.1211-1219
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    • 1995
  • An upper bound elemental technique (UBET) program has been developed to analyze forging load, die-cavity filling and effective strain distribution for flash and flashless forgings. The simulation for flash and flashless forgings are applied axisy mmetric and plane-strain closed-die forging with rib-web type cavity. Inverse triangular and inverse trapezoidal elements are used to analyze flashless forging. The analysis is described for merit of flashless precision forging. Experiments have been carried out with pure plasticine billets at room temperature. Theoretical predictions of the forging load and the flow pattern are in good agreement with experimental results.

A Study on the Optimum Velocity Fields in Precision Forging (정밀단조 해석을 위한 최적 속도장에 관한 연구)

  • 이종헌;김영호;김진욱
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.837-841
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    • 1997
  • An upper bound elemental technique(UBET) program has been developed to analyze forging load, die-cavity filling and optimum kinematically admissible velocity fields for flashless forging. The simulation for flashless forgings are applied plane and axisymmetric closed-die forging with rib-web type cavity. The kinematically admissible velocity fields for inverse triangular and inverse trapezoidal elements, are used to analyze flashless forging. Experiments have been carried out with pure plasticine billets at room temperature. Theoretical predictions of the forging load in plane-strain and axisymmetric forging are in good agreement with experimental results.

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A Study on the Optimum Velocity Fields in Plane-strain and Axisymmetric Forging (평면변형 및 축대칭 단조에서 최적 속도장에 관한연구)

  • 김진욱
    • Journal of Advanced Marine Engineering and Technology
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    • v.23 no.3
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    • pp.379-388
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    • 1999
  • Au upper bound elemental technique(UBET) program has been developed to analyze forging load die-cavity filling and optimum kinematically admissible velocity fields for flashless forging. The simulation for flashless forgings are applied plane-strain and axisymmetric closed-die forging with rib-web type cavity. The kinematically admissible velocity fields for inverse triangular and inverse trapezoidal elements are used to analyze flashless forging,. Experiments have been carried out with pure plasticine billets at room temperature. Theoretical predictions of the forging load in plane-strain and axisymmetric forging are in good agreement with experimental results.

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A Study on Flashless Non-Axisymmetric Forging (플래시 없는 비축대칭 단조에 관한 연구)

  • Bae, Won-Byong;Kim, Young-Ho;Choi, Jae-Chan;Lee, Jong-Heon;Kim, Dong-Young
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.3
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    • pp.42-52
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    • 1995
  • An UBET(Upper Bound Elemental Techniquel) program has been developed to analyze forging load, die-cavity filling and effective strain distribution for flashless non-axisymmetric forging. To analyze the process easily, it is suggested that the deforma- tion is divided into two different parts. Those are axisymmetric part in corner and plane- strain part in lateral. The total power consumption is minimized through combination of two deformation parts by building block method, form which the upper-bound forging load, the flow pattern, the grid pattern, the velocity distribution and the effective strain are deter- mined. To show the merit of flashless forging, the results of flashless and flash-forging processes are compared through theory and experiment. Experiments have been carried out with plasticine billets at room temperature. The theoretical predictions of the forging load and the flow pattern are in good agrement with the experimental results.

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A study on plane-strain forging using UBET (상계요소법을 이용한 평면변형 단조에 관한 연구)

  • 이종헌;김진욱
    • Journal of Advanced Marine Engineering and Technology
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    • v.22 no.1
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    • pp.7-15
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    • 1998
  • An upper bound elemental technique(UBET) program has been developed to analyze forging load, die-cavity filling and effective strain distribution for flash and flashless forgings. The program consists of forward and backward tracing processes. In the forward program, flash, die filling and forging load are predicted. In backward tracing process, the optimum dimensions of initial billet in conventional forging are determined from the final-shape data based on flash design. And the analysis is described for merit of flashless precision forging. Experiments are carried out with pure plasticine billets at room temperature. The theoretical predictions of forging load and flow pattern are in good agreement with the experimental results.

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A Study on Non-Axisymmetric Precision Forging with and without Flash (플래쉬 유무에 따른 비축대칭 정밀단조에 관한 연구)

  • 배원병;김영호;최재찬;이종헌;김동영
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1993.10a
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    • pp.218-223
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    • 1993
  • An UBET(Upper Bound Elemental Technique) program has been developed to analyze forging load, die-cavity filling and effective strain distribution for flashless forging. To analyze the process easily, it is suggested that the deformation is divided into two different parts. Those are axisymmetric part in corner and plane-strain part in lateral. The total power consumption is minimized through combination of two deformation parts by building block method, from which the upper-bound forging load, the flow pattern, the grid pattern, the veocity distribution and the effective strain are determined. To show the merit of flashless forging, the result of flashless and flash forging processes are compared through theory and experiment. Experiments have been carried out with plasticine billets at room temperature. The theoretical predictions of the forging load and the flow pattern are in good agreement with the experimental results.

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