• Title/Summary/Keyword: 디프 드로잉

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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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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.

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 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.

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 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 Multi-stage Deep Drawing Processes Using Finite Element Method (유한요소법을 이용한 다단계 디프 드로잉 공정에 관한 연구)

  • 최병화;민동균;박태종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.1021-1025
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    • 2002
  • There have been many researches performed on the formability of axisymmetric or rectangular cup shapes in the deep drawing processes. But non-axisymmetric deep drawing processes rely upon empirical knowledge of experts in most cases. Especially, there have been few researches for multi-stage elliptical deep drawing processes. In this study, formability and thickness distributions of elliptical yoke products were predicted by using finite element analysis. The results of the analysis were compared with those of experiments for validity.

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Application of Surface Area Calculating System for Design of Blank Shape of Deep Drawing Product (디프 드로잉 제품의 블랭크 설계를 위한 표면적 계산 시스템의 적용)

  • 박동환;최병근;박상봉;강성수
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.4
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    • pp.97-105
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    • 2000
  • One of the most important steps to determine the blank shape and dimensions in deep drawing process is to calculate the surface area of the product. In general, the surface area of axisymmetric products is calculated by mathematical or graphical methods. However, in the case of non-axisymmetric products, it is difficult to calculate the exact surface area due to errors as separated components. Fortunately, it is possible for elliptical products to recognize the geometry of the product in the long side and short side by drafting in another two layers on AutoCAD software. So, in this study, a surface area calculating system is constructed for a design of blank shape of deep drawing products. This system consists of input geometry recognition module and three dimensional modeling module, respectively. The suitability of this system is verified by applying to a real deep drawing product. The system constructed in this study would be very useful to reduce lead time and cost for determining the blank shape and dimensions.

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