• Title/Summary/Keyword: Stiffness of Blankholder

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A study on the effect of die lubrication in deep drawing process with spring type blankholder system (스프링형 블랭크홀더 시스템의 디프드로잉 가공에서 다이면 윤활효과에 관한 연구)

  • 이종국;강명순
    • Journal of the korean Society of Automotive Engineers
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    • v.11 no.3
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    • pp.49-59
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    • 1989
  • The purpose of this paper is to obtain the effect of die lubrication in deep drawing process. The flange wrinkling is analysed by a moment equilibrium method in order to apply the optimum blankholding force to the blank. The experiment has been carried out with the high stiffness spring-type blankholder system. As the result, blankholding pressure is determined in terms of variables in deep drawing process. In the range of frictional coefficient which has been found in this experiment, there was a little difference in required blankholding force but a great difference in drawing force. It was found that the stiffness of blankholder was the major factor which influences on flange wrinkling in spring-type blankholder system.

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A Study on the Blankholding Force in Deep Drawing Process (디프 드로잉 가공시 블랭크 홀더력에 관한 연구)

  • 이종국;강명순
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.13 no.5
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    • pp.886-900
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    • 1989
  • The purpose of this paper is to obtain the effect of blankholding force in deep drawing process. Flange deformation is analysed by theoretical approach in order to apply the optimum blankholding force to the blank. As the result, the upper and lower blankholding force is determined in terms of variables in deep drawing process. Experiment are carried out with the high stiffness spring-type blankholder system. Theoretical upper blankholding force are relatively good agreement with experimental result and the range of initial blankholding forces for various materials tested are found by experiment.