• Title/Summary/Keyword: 디프드로잉

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Texture Evolutions in Al sheet during the deep drawing process (Al 판재의 디프 드로잉 공정에서의 집합조직 변화 고찰)

  • 조재형;최시훈;오규환
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1997.03a
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    • pp.303-306
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    • 1997
  • $\alpha$형과 $\beta$형 섬유조직의 압연 집합조직을 초기 집합조직으로 갖는 알루미늄 판재의 디프드로잉 공정시 집합조직 변화를 고찰하였다. 플랜지 변형 단계에서는 Bs성분은 감소하 였으며, Goss, Cu, P등의 성분들은 증가하였다. 컵의 윗쪽에서는 아랫쪽에 비하여 Goss, Cu 성분은 증가하고 P성분의 변화는 적었다. 이는 컵의 윗쪽에서는 플랜지에서 받은 평면변형 의 정도가 컵의 아랫쪽에 비하여 크기 때문이다. 실제 디프드로잉 공정에서의 변형량에서는 결정들이 안정방위로의 회전경로인 $\alpha$D형의 섬유와 $\beta$D형의 섬유로 이동하게 된다.

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Finite Element Analysis of Deep Drawing for Axisymmetric Sheet Metal Housing (축대칭 박판 하우징의 디프드로잉 성형에 대한 유한요소법해석 및 파단 원인 분석)

  • 윤정호
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1994.06a
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    • pp.191-198
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    • 1994
  • A practical example of the axisymmetric deep drawing process is simulated by the elastic-plastic finite element analysis using updated Lagrangian approach considering the large deformation. An approach is suggested to solve the problem of the ductile fracture that may encounter during the deep drawing process. The result can be applied to the design of the die for the axisymmetric deep drawing.

Finite Element Analysis of Axisymmetric Multi-Stage Deep Drawing Processes (축대칭 다단계 디프드로잉 공정의 유한요소해석)

  • 윤정환;유동진;양동열;김석관
    • Transactions of Materials Processing
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    • v.3 no.4
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    • pp.468-481
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    • 1994
  • Mathematical description of arbitrarily-shaped tool surface are introduced by parametric patch approaches along with the related contact search algorithm. In order to maintain the advantages of membrane elements and to incoporate the bending effect, a BEAM(Bending Energy Augmented Membrane) element is proposed. Computation are carried out for some complex axisymmetric multi-stage deep drawing to verify the validity and the effectiveness of the proposed method.

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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.

Tool Temperatures to Maximize the Warm Deep-drawability of AZ31B Sheets (AZ31B 판재의 온간 디프드로잉 성형성 극대화를 위한 금형 온도)

  • Choi, S.C.;Kim, H.J.;Kim, H.Y.;Hong, S.M.;Shin, Y.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.66-70
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    • 2008
  • In this study, the formability of AZ31B magnesium alloy sheets was investigated by the analytical and experimental approaches. Tensile tests and limit dome height tests were rallied out at several temperatures between $25^{\circ}C$ and $300^{\circ}C$ to obtain the mechanical properties and forming limit diagram (FLD). The FLD-based criterion considering the strain-path and the blank temperature was used to predict the forming limit in a deep-drawing process of cross-shaped cup by finite element analysis. This criterion proved to be very useful in determining the optimal process conditions such as blank shape, punch velocity, minimum comer radius, fillet size, and so on, through the comparison between FEA and experimental data. In particular, the temperature of each tool that provided the best formability of the blank was determined by coupled temperature-deformation analyses. A practical method that can greatly reduce the forming time by increasing the punch speed during the forming process was suggested.

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A Study on the Process Analysis of Multi-Stage Deep Drawing (다단계 디프드로잉의 공정해석에 관한 연구)

  • 심재진;전병희;김낙수
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.12
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    • pp.2936-2948
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    • 1993
  • Multi-stage deep drawing is an important sheet metal forming process. The deformation mechanisms of sheet metals during forming processes are complicated mainly due to the geometry and the lubrication of tools involved, the formability and the anisotropic behaviour of the material. The multi-stage deep-drawing processes including normal-drawing, reverse-drawing, and re-drawing are analyzed by use of the rigid-plastic finite element method. The anisotropic behaviour represented by r-value can be incorporated into the formulation. Punch/die loads and thickness distributions were obtained as results of simulating axisymmetric deep drawing processes. The computed results showed good agreements with experiments.

The Simulations on the Formability of AZ31 Magnesium Alloy Sheet in Warm Deep Drawing (AZ31 마그네슘합금판의 온간 디프드로잉 성형성해석)

  • Kang, Dae-Min;Hwang, Jong-Kwan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.3 no.1
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    • pp.52-58
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    • 2004
  • The material used is a commercial magnesium based alloy AZ31(Mg-3Al-1Zn)sheet with a thickness of 1.0mm. Uniaxial tension tests at warm temperature were carried out to investigate the material characteristics of K, m, and n. A warm drawing process with a local heating and cooling technique was developed to improve formability in this study with results of uniaxial tension tests because it is very difficult for Mg alloy to deform at room temperature by the conventional method. The die and blank holder were heated up, while the punch was water-cooled during deformation. FE simulations considering heat transfer were executed with Mg alloy to investigate the Improvement of deep drawability. For the assessment of improvement those were compare with the results of no considering heat transfer and room temperature.

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A Study on the Acoustic Transmission Characteristics of Polygon Accumulator (다각형 Accumulator의 음향 특성 연구)

  • Seo, Won-Sik;Kong, Byung-O;Kim, Young-Ho;Nam, Kyeong-Hun
    • Journal of Advanced Marine Engineering and Technology
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    • v.33 no.5
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    • pp.653-661
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    • 2009
  • In order to reduce the noise and oscillation, it is consider a matter in all aspects about the noise stem from accumulator and the characteristic of transmission, Transformation of outside shape has change of noise occurrence at transmission process. Therefore, performed sound numerical analysis and conducted an experiment to examine the birthplace of accumulator's external shape change. In a sound numerical analysis, we can fond out transmission loss between inlet and outlet's sound pressure. In an experiment, we can make out transmission loss by sound wave separation theory through drawing sound pressure inlet and outlet.

A Study on the Formability Estimation of Deep Drawing Process by using Taguchi Method (다구찌방법을 이용한 디프드로잉 공정의 가공성평가에 대한 연구)

  • 이병찬;강연식;양동열;문재호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.938-942
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    • 1996
  • Despite the increasing demand for improved product design, a limited number of works have been reported in the field of sheet metal forming. In the present study, introducing the Taguchi method, an optimal and robust combination of parameters is found and a data base management system and nomograms are utilized for knowledge acquisition. The developed system is applied to a deep drawing process, Through the present study, it is shown that the developed system is useful for the design and the formability estimation of sheet metal forming processes.

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A study on the formability estimation of deep drawing process by using taguchi method (다구찌방법을 이용한 디프드로잉 공정의 가공성평가에 대한 연구)

  • Lee, B.C.;Moon, J.H.;Yang, D.Y.
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.11
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    • pp.17-24
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    • 1997
  • Despite the increasing demands for improved product design, a limited number of works have been reported in the field of sheet metal forming. In the present study, introducing the Taguchi method, an otpimal and robust combination of parameters in found and a data base management system is utilized for knowledge acquisition. Analysis data, estimation rules of formability and graphical representation of the analysis have been employed for the dewigner's understanding and evaluation. The developed system is applied to a deep drawing process. Through the present study, it is shown that the developed systerm is useful for the design and the formability estimation of sheet metal forming processes.

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