• Title/Summary/Keyword: deep drawing

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Simulation of Texture Evolution in DP steels during Deep Drawing Process (DP강의 디프드로잉 시 집합조직 발달 시뮬레이션)

  • Song, Y.S.;Han, S.H.;Chin, K.G.;Choi, S.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.130-133
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    • 2008
  • The formability of DP steels can be affected by not only initial texture but also deformation texture evolved during plastic deformation. To investigate the evolution of deformation texture during deep drawing, deep drawing process for DP steels was carried out experimentally. A rate sensitive polycrystal model was used to predict texture evolution during deep drawing process. In order to evaluate the strain path during deep drawing, a steady state was assumed in the flange part of deep drawn cup. A rate sensitive polycrystal model successfully predicted the texture development in DP steels during deep drawing process. It was found that the final stable orientations were strongly dependent on the initial location in the blank.

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Experimental study on the severe deep drawing for complex cylindrical housing of STS 305 stainless steel (스테인리스 강 STS305의 디프 드로잉 가공에 관한 실험적 연구)

  • Kim, Doo-Hwan
    • Transactions of Materials Processing
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    • v.7 no.5
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    • pp.439-444
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    • 1998
  • Recently many automotive parts have been made with stainless steels by deep drawing processes, But there are various problems occurred in deep drawing works of stainless steels compared with low carbon steels. For the severe deep drawing of complex cylindrical housing optimum process planning is required to eliminate intermediate annealing improve shape accuracy and maintain surface integrity without drawing defects such as tears wrinkles and scratches or galling. Therefore in this study a sample process planning of the severe of the severe deep drawing process is applied to a complex cylindrical housing needed for a 6 multi-stepped deep drawing of type STS 305 . A series of experiments are performed to investigate optimum process variables such as drawing rate radius and clearance. Through experiments the variations of the thickness strain distribution and hardness distribution in each drawing step are observed. Also the effects of other factors on formability such as drawing oil, blank holding force and die geometry are examined and discussed.

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A Study on the Formability of Sheet Metal Under Counter Pressure Deep Drawing (대향 액압 디프드로잉법 시 박판 성형성에 관한 연구)

  • 황종관;강대민;정수종
    • Transactions of Materials Processing
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    • v.11 no.8
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    • pp.676-681
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    • 2002
  • The square cup deep drawing simulations for hydraulic counter pressure deep drawing are carried out by the finite element method and the formability factors which affect to the formability in case of that process are investigated. As a result, it is found that the thickness distributions keep the higher quality than that of the conventional deep drawing, and the maximum pressure increased the thickness at the die profile regions of blank. But friction coefficient decreased the thickness at the same regions.

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.

A Method of Surface Mapping for Deep Drawing Process (Deep Drawing 공정을 위한 곡면 매핑 방법)

  • 임용현;박준영
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2000.04a
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    • pp.721-723
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    • 2000
  • Deep Drawing공정은 2차원 박판(Sheet Metal)에 그림이나 글자를 인쇄한 다음, 박판을 다이에 고정하고 펀치로 눌러서 3차원의 제품을 생산하는 소성가공의 한 방법이다. 그러므로, 2차원 평면인 박판에 어떻게 적절히 인쇄하여, 가공 후의 3차원 제품에 원하는 그림과 글자가 나타나게 할 수 있는지가 문제가 되고 있다. 본 논문에서는 Deep Drawing공정을 거쳐 완성된 제품을 측정한 후, 형상 역공학(Reverse Engineering) 기술을 이용하여 측정 데이터(Measured Points Data)를 입력으로 하는 매개변수 곡면 (Parametric Surface)을 만들고, Deep Drawing공정 전의 박판에 대한 매개변수 곡면을 만든 다음 두 곡면간의 매핑을 통해 위의 문제점을 해결하고자 한다.

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Simulation of Texture Evolution and Anisotropy Behavior in Dual Phase Steels during Deep Drawing Process (DP강의 디프드로잉 시 집합조직 발달과 이방성 거동 시뮬레이션)

  • Song, Young-Sik;Kim, Dae-Wan;Yang, Hoe-Seok;Han, Sung-Ho;Chin, Kwang-Gun;Choi, Shi-Hoon
    • Korean Journal of Metals and Materials
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    • v.47 no.5
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    • pp.274-282
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    • 2009
  • To investigate the evolution of deformation texture in dual phase (DP) steels during deep-drawing deformation, deep-drawing experiments were performed. Microtexture measurements were conducted using electron backscattered diffraction (EBSD) to analyze texture evolution. A rate-sensitive polycrystal model was used to predict texture evolution during deep-drawing deformation. In order to evaluate the strain path during deep-drawing deformation, a steady state was assumed in the flange part of a deep-drawn cup. A ratesensitive polycrystal model successfully predicted the texture evolution in DP steels during deep-drawing deformation. The final stable orientations were found to be strongly dependent on the initial location in the blank. Texture analysis revealed that the deep drawability of DP steels decreases as the true strain in the radial direction of the deep-drawn cup increases during deep-drawing deformation.

Analysis of the Axisymmetric Hydro-Mechanical Deep Drawing Process by Using the Finite Element Method (유한 요소법을 이용한 축대칭 하이드로 미케니칼 디프 드로잉 공정의 해석)

  • 양동열;김한경;이항수;김경웅
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.5
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    • pp.873-882
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    • 1992
  • The study is concerned with the rigid-plastic element analysis for axisymmetric hydromechanical deep drawing in which the fluid flow influences the metal deformation. Due to the fluid pressure acting on the sheet material hydromechanical deep drawing is distinguished from the conventional deep drawing processes. In considering the pressure effect, the governing equation for fluid pressure is solved and the result is reflected on the global stiffness matrix. The solution procedure consists of two stages ; i.e., initial bulging of the sheet surface before the initiation of steady fluid flow in the flange and fluid-lubricated stage. The problem is decoupled between fluid analysis and analysis of solid deformation by deformation by iterative feedback of mutual computed results. The corresponding experiments are carried out for axisymmetric hydro-mechanical deep drawing of annealled aluminium sheet as well as for deep drawing. It has been shown from the experiments that the limit drawing ratio for hydro-mechanical deep drawing is improved as compared with deep drawing. The computed results are in good agreement with the experiment for variation of punch head and chamber pressure with respect to the punch travel and for distribution of thicknees strain. It is thus shown that the present method of analysis can be effectively applied to the analysis of axisymmetric hydro-mechanical deep drawing processes.

The influence of punch and die shape radius in non-axisymmetric deep drawing products (비축대칭 디프 드로잉 제품에서 펀치 및 다이형상반경의 영향)

  • 박동환
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1999.03a
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    • pp.22-25
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    • 1999
  • 'There are a lot of process variables, exerted influence on the formability of products, in deep drawing process. Particularly, it is important that the punch and die shape radius of the process variables. Though researches have been performed on the deep drawing of sheet metal forming, like this study, but it is insufficient the actual circumstances that researches for process variables of the non-axisymmetric deep drawing products. In this study, An effect on thickness distribution is grasped as alteration of the punch and die shape radius in the process of non-axisyrnmetric deep drawing products, and then the optimal punch and die shape radius were presented, they were verified by the numerical analysis method (FEM).

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Expert System for Deep Drawing Process Planning : DOX (Deep Drawing 공정 설계 전문가시스템 DOX의 개발에 관한 연구)

  • 조성진;오준환;남배중;이재원
    • Journal of Intelligence and Information Systems
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    • v.2 no.2
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    • pp.55-68
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    • 1996
  • 인공 지능의 주요 분야 중 하나의 전문가시스템 기술은 현재 산업현장에서 여러 가지 분야의 문제해결에 이용되고 있다. 본 논문은 축 대칭 원통형 제품의 deep drawing 공정 설계를 위한 전문가시스템 DOX(Deep drawing Opertion eXpert)의 개발에 관한 것이다. 시스템의 입력은 원통형 제품의 형상 정보와 재질 정보이며 자동 인식 또는 수동입력의 방법으로 입력된다. 시스템은 이러한 정보를 받아들여 deep drawing 공정설계에 필요한 다수의 요소들을 결정하며, 최종결과로서 process layout 도면을 CAD 시스템에서 자동 출력한다. 개발된 전문가시스템의 지식베이스는 산업 분야 전문가의 전문 지식과 경험지식을 획득, 분석하여 구성하였으며, 추론 전략으로는 규칙기반추론(rule-based reasoning)을 이용하였다.

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A Study on the Geometrical shape of Blank in Elliptical Deep Drawing (타원형 디프 드로잉 공정에서 블랭크의 기하학적 형상에 관한 연구)

  • 박동환
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2000.04a
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    • pp.146-150
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    • 2000
  • there are a lot of process variable exerted influence on the formability of products in deep drawing process. Particularly it is important that blank shape of the process variables. A paper to be connected with process variables of elliptical deep drawing products is insufficient the actual circumstances enough though researches have been performed on the deep drawing of sheet metal forming. In this study The effects of thickness distribution and movement of sheet are grasped as alteration of blank shapes in the process of elliptical deep drawing product and then optimal blank shape was presented. They were verified by the finite element analysis (FEA) and experiment.

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