• Title/Summary/Keyword: 스템핑 공정

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A Study of Auto-body Panel Correction of Forming Analysis that Use Dynamic-extensive Finite Element Method (동적-외연적 유한요소법을 이용한 차체 판넬 성형해석에 관한 연구)

  • Jung Dong Won;Hwang Jae Sin
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.10
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    • pp.115-126
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    • 2004
  • In the present work a finite element formulation using dynamic-explicit time integration scheme is used for numerical analysis of auto-body panel stamping processes. The lumping scheme is employed for the diagonal mass matrix and dynamic explicit formulation. Analyzed auto-body panel stomping process correction of forming using software called Dynaform using dynamic extensive method. Further, the simulated results for the auto-body panel stamping processes are shown and discussed. Its application is being increased especially in the automotive industrial area for the cost reduction, weight saving, and improvement of strength.

A Study on Analysis of Qtr inr RH Auto-Body Panel Stamping Processes (Qtr inr RH 차체판넬 스테핑공정 해석에 관한 연구)

  • Ahn H. G.;Lee C. H.;Moon W. S.;Park Y. K.;Jung D. W.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2005.10a
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    • pp.67-70
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    • 2005
  • The static implicit finite element method is applied effectively to analyze total roof panel stamping processes, which include the forming stage. complicated and abnormal Large size roof panel was analyzed by using commercial program called AutoForm. Analysis results examining possibility and validity of the AutoForm software and the factor study are presented. Further, the simulated results for the total roof panel stamping processes are shown and discussed. Its application is being increased especially in the automotive industrial area for the cost reduction, weight saving, and improvement of strength.

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The sectional analysis of auto-body panel stamping process and three-dimensional shape composition (차체판넬 스템핑공정의 단면해석과 3차원 형상합성)

  • Jung, Dong-Won;Yang, Dong-Yol
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.9
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    • pp.101-107
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    • 1997
  • A sectional analysis of auto-body panel stamping is carried out by using the rigid-plastic FEM based on the membrane theory. The auto-body panel material is assumed to possess normal anisotropy and to obey Hill's new yield criterion and its associated flow rule. A method of contact treatment is proposed in which the skew boundary condition for arbitarily shaped tools is successively used during iteration. Deformation of each section of trunk-lid panel is simulated and composed to get the three-dimensional shape by using CAD technique. It was shown that the composition of the two-dimensional section analysis gives almost the same results as the full three-dimensional analysis.

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3-D FEM Analysis of Forming Processes of Planar Anisotropic Sheet Metal (평면이방성 박판성형공정의 3차원 유한요소해석)

  • 이승열;금영탁;박진무
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.8
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    • pp.2113-2122
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    • 1994
  • The 3-D FEM analysis for simulating the stamping operation of planar anisotropic sheet metals with arbitrarily-shaped tools is introduced. An implicit, incremental, updated Lagrangian formulation with a rigid-viscoplastic constitutive equation is employed. Contact and friction are considered through the mesh-normal, which compatibly describes arbitrary tool surfaces and FEM meshes without depending on the explicit spatial derivatives of tool surfaces. The consistent full set of governing relations, comprising equilibrium equation and mesh-normal geometric constraints, is appropriately linearized. The linear triangular elements are used for depicting the formed sheet, based on membrane approximation. Barlat's non-quadratic anisotropic yield criterion(strain-rate potential) is employed, whose in-plane anisotropic properties are taken into account with anisotropic coefficients and non-quadratic function parameter. The planar anisotropic finite element formulation is tested with the numerical simulations of the stamping of an automotive hood inner panel and the drawing of a hemispherical punch. The in-plane anisotropic effects on the formability of both mild steel and aluminum alloy sheet metals are examined.

A Study of Tool Planning for Forming Analysis in REF SILL OTR-R/L Auto-Body Panel Stamping Process (REF SILL OTR-R/L 차체판넬 스템핑 공정에서 성형해석을 통한 공법개발에 관한 연구)

  • Ko H.H.;Ahn H.G.;Lee C.H.;Ahn B.I.;Moon W.S.;Jung D.W.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.1980-1983
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    • 2005
  • The characteristic of sheet metal process is the few loss of material during process, the short processing time and the excellent price and strength. The sheet metal process with above characteristic is common used in industrial field, but in order to analysis irregular field problems the reliable and economical analysis method is demanded. Finite element method is very effective method to simulate the forming processes with good prediction of the deformation behaviour. Among Finite element method, The static-implicit finite element method is applied effectively to analyze real-size auto-body panel stamping processes, which include the forming stage. In this paper, it was focussed on the drawability factors on auto-body panel stamping by AUTOFORM with using tool planing alloy to reduce law price as well as high precision from Design Optimization of ide. According to this study, the results of simulation will give engineers good information to access the Design Optimization of die.

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A Study of Tool Planning for Forming Analysis in REF SILL OTR-R/L Auto-Body Panel Stamping Process (REF SILL OTR-R/L 차체판넬 스템핑 공정에서 성형해석을 통한 공법개발에 관한 연구)

  • Ko Hyung-Hoon;Ahn Hyun-Gil;Lee Chan-H;Ahn Byung-Il;Moon Won-Sub;Jung Dong-Won
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.3 s.180
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    • pp.118-124
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    • 2006
  • The characteristic of sheet metal process is the few loss of material during process, the short processing time and the excel lent price and strength. The sheet metal process with above characteristic is common used in industrial field, but in order to analysis irregular field problems the reliable and economical analysis method is demanded. Finite element method is very effective method to simulate the forming processes with good prediction of the deformation behavior. Among Finite element method, the static-implicit finite element method is applied effectively to analyze real-size auto-body panel stamping processes, which include the forming stage. In this paper, it was focused on the drawing ability factors on auto-body panel stamping by AUTOFORM with using tool planning alloy to reduce law price as well as high precision front Design Optimization of die. According to this study, the results of simulation will give engineers good information to access the Design Optimization of die.

Prediction of Hardness of Hot Stamped Parts Using the Quench Factor Analysis (핫스템핑 공정에서 Quench Factor Analysis를 이용한 제품의 경도 예측)

  • Choi, J.Y.;Ko, D.H.;Seo, P.K.;Cha, S.H.;Kim, B.M.
    • Transactions of Materials Processing
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    • v.23 no.6
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    • pp.357-362
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    • 2014
  • The purpose of the current study is to predict the hardness distribution in steel products after hot stamping using a quench factor analysis(QFA) coupled with FE-simulations. QFA is a method to predict properties such as hardness and tensile strength based on time-temperature-property(TTP) curves and can determine properties based on the temperature histories. The constants($K_1{\sim}K_5$) of QFA were determined using hardness data obtained after various cooling rates. In the current study, a rear side member was selected for evaluation and FE-simulations were performed to obtain the temperature histories during hot stamping. The predicted temperature data were imported into the QFA to calculate the hardness distribution of the hot stamped parts. A hot stamping experiment of the rear side member was conducted to verify the predicted hardness. The simulation results show good agreement with the experimental measurements.

Experimental Study on the Frictional Constraint of Draw Bead (드로오 비드의 마찰구속에 관한 실험적 연구)

  • 김영석;장래웅;최원집
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.4
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    • pp.658-666
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    • 1992
  • In developing computer-aided design technology for optimization of stamping die design, it has been an important issue to treat the frictional constraint acting on the blank holder surface. The main goal of this work is to establish database of draw bead restraint force and clarify friction characteristic for various automotive sheet steels, which is essential in developing friction algorithm that can be used for CAD of stamping die design. Draw bead friction tester is used to evaluate the various parameters that affect the draw restraint force and the coefficient of friction for the cold rolled and the coated sheet steels such as drawing rate, lubricant type, surface property of material, etc.

A study on laser welding characteristics of 1.5GPa grade boron alloyed steel with Al coating (1.5GPa급 알루미늄 코팅 강재의 용접 특성에 관한 연구)

  • Kang, Min-Jung;Kim, Cheol-Hee;Choi, Jin-Jang
    • Proceedings of the KWS Conference
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    • 2010.05a
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    • pp.29-29
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    • 2010
  • 레이저 용접은 고밀도 에너지빔을 이용하는 용접방법으로 아크용접에 비해 빠른 용접과 깊은 용입이 가능하며, 낮은 열이력을 가지는 장점이 있다. 때문에 열에 의해 연화되는 고강도강의 용접에 큰 이점을 가지고 있다. 차체경량화 추세와 더불어 차량에 고강도강의 적용이 늘어나고 있는데 충돌시 차량 구조를 유지시켜주는 범퍼나 B-필러와 같은 부품에 적용되는 무도금 보론 합금강과 알루미늄 코팅 보론 합금강은 핫스템핑(Hot Stamping) 기술에 의해 제조된 소재로 약 1.5GPa의 인장강도를 가진다. 알루미늄 코팅 보론 합금강의 경우 제조공정과 이송 중 소재 표면산화에 의한 산화철발생 또는 표면 탈탄 현상을 방지하기 위해 알루미늄 코팅 처리를 하는데 이러한 코팅층이 용접시 용접부의 물성을 저하시키는 역할을 한다고 보고되어 있다. 본 연구에서는 1.5GPa급 무도금 보론 합금강과 알루미늄 코팅 보론 합금강을 대상으로 레이저 용접을 적용하여 용접부 특성을 파악하고자 하였다. 실험은 겹치기 형상으로 Fiber Laser, Disk Laser를 적용하여 진행하였으며 빔Size, 용접속도, Gap등을 변경하며 해당조건에서의 용입특성, 파단모드, 기계적특성 등을 알아보았다.

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Prediction of Air Pocket Pressure in Draw Die during Stamping Process (드로우 금형의 에어포켓 수축에 따르는 내부공기 압력예측에 대한 연구)

  • Koo, Tae-Kyong;Hwang, Se-Joon;Park, Warn-Gyu;Oh, Se-Wook
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.6
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    • pp.10-18
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    • 2008
  • Metal stamping is widely used in the mass-production process of the automobile industry. During the stamping process, air may be trapped between the draw die and the panel. The high pressure of trapped air induces imperfections on the panel surface and creates a situation where an extremely high tonnage of punch is required. To prevent these problems, many air ventilation holes are drilled through the draw die and the punch. The present work has developed a simplified mathematical formulation for computing the pressure of the air pocket based on the ideal gas law and isentropic relation. The pressure of the air pocket was compared to the results by the commercial CFD code, Fluent, and experiments. The present work also used the Bisection method to calculate the optimum cross-sectional area of the air ventilation holes, which did not make the pressure of the air pocket exceed the prescribed maximum value.