• Title/Summary/Keyword: 스템핑

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Present status and future prospect of tailored blank forming technology (합체 박판(tailored blank) 성형 기술의 개발 현황과 전망)

  • 백승준;구본영;강수영;이호기
    • Journal of the korean Society of Automotive Engineers
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    • v.19 no.1
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    • pp.3-10
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    • 1997
  • 합체 박판을 사용한 생산 방식은 소수의 스템핑 금형 공정으로 인해 전반적으로 공기가 짧아지고, 보다 견고하며 외관상 우수한 차체를 생산할 수 있다. 또한 재료의 수율을 극대화할 수 있을 뿐만 아니라 차체 각부에서 요구되는 성질과 조건에 따라 판 두께나 재질을 대응할 수 있다는 등의 장점을 가지고 있어 초기긔 설비비는 다른 생산 방식에 비해 고가이지만 전체 공정과 장기적인 관점에서 생산비가 절감된다. 본 기고에서는 합체 박판의 생산 및 활용정도와 각 기업체나 연구소들에서의 연구 진척상황, 그리고 앞으로의 전망에 대해 논한다.

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An Effective Design Method of Stamping Process by Feasible Formability Diagram (가용 성형한계영역을 이용한 스템핑 공정의 효율적 설계방법)

  • Cha, Seung-Hoon;Lee, Chan-Joo;Lee, Sang-Kon;Kim, Bong-Hwan;Ko, Dae-Cheol;Kim, Byung-Min
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.11
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    • pp.108-115
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    • 2009
  • In metal forming technologies, the stamping process is one of the significant manufacturing processes to produce sheet metal components. It is important to design stamping process which can produce sound products without defect such as fracture and wrinkle. The objective of this study is to propose the feasible formability diagram which denotes the safe region without fracture and wrinkle for effective design of stamping process. To determine the feasible formability diagram, FE-analyses were firstly performed for the combinations of process parameters and then the characteristic values for fracture and wrinkle were estimated from the results of FE-analyses based on forming limit diagram. The characteristic values were extended through training of the artificial neural network. The feasible formability diagram was finally determined for various combinations of process parameters. The stamping process of turret suspension to support suspension module was taken as an example to verify the effectiveness of feasible formability diagram. The results of FE-analyses for process conditions within fracture and wrinkle as well as safe regions were in good agreement with experimental ones.

Improvement of Surface Quality of a Stamped Sheet Metal Member with CAE (CAE를 활용한 박판 성형 부재의 면 품질 개선)

  • Kim, K.P.;Kim, S.H.;Lee, D.G.;Lee, K.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.05a
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    • pp.318-321
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    • 2007
  • This paper is concerned with improvement of surface quality of a sheet metal member in the stamping process. The CAE procedure of the stamping process is utilized in order to investigate cause of surface troubles and to improve surface quality. A complicated shape of the sheet metal member can induce surface troubles such as wrinkles because of insufficient tensions force and non-uniform contact of a blank sheet with tools. This paper proposes two guidelines such as a change of tool shape and added draw-beads on the tool surface in order to increase tension forces and to induce uniform contact. The proposed guidelines are verified with the CAE of the stamping process. The CAE results show that the changed shape of tools and added draw-beads can reduce the amount of wrinkles and improve surface quality.

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Lap joint Laser Welding of Hot Stamped Ultra High Strength Steel for Automotive Application (자동차용 핫스탬핑 고강도강 판재의 겹치기 레이저용접)

  • Kim, Yong;Park, Ki-Young;Lee, Kyoung-Don
    • Laser Solutions
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    • v.15 no.1
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    • pp.1-5
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    • 2012
  • Recently ultra high strength steels(UHSS) has been widely applied to the structural or safety components in the automotive industry. Specially, hot stamping boron steel 22MnB5 has shown the crash-resistant characteristics when applying to bumpers and pillars. Lap joint Laser welding of the hot stamped and die quenched sheets of Boron steel was carried out using 3kW Nd/YAG laser. The appropriate Lap joint laser welding conditions were founded separately for four lap joint combinations. The lower sheest is a hot stamped sheet in common and the upper sheet is selected among the hot stamped steel and high strength steels such as SPCC, 370MPa, and 590MPa grade high strength steels. Cross bead sections and local hardening and softening were observed as well as tensile-shear test results.

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A Dynamic-explicit Finite Element Analysis for Hydro-forming Process (Hydro-forming 공정을 위한 동적-외연적 유한요소해석)

  • Jung, D.W.;Hwang, J.S.
    • Journal of Power System Engineering
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    • v.8 no.3
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    • pp.23-29
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    • 2004
  • In this paper, a finite element formulation using dynamic-explicit time integration scheme is used for numerical analysis of Hydro-forming processes. The lumping scheme is employed for the diagonal mass matrix and dynamic explicit formulation. Hydro-forming process for auto-body panel forming is analyzed by using dynamic-explicit finite element method. Further, the simulated results of the Hydro-forming 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 dynamic explicit analysis of auto-body panel stamping process and investigating parameter affects of dynamic analysis (차체판넬 스템핑공정의 동적 외연적해석과 동적해석에 미치는 영향인자 분석)

  • Jung, Dong-Won
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.22 no.2
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    • pp.380-390
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    • 1998
  • 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 linearizing dynamic formulation. A contact scheme is developed by combining the skew boundary condition and direct trial-and-error method. In this work, for economic analysis the faster punch velocity and the mass scaling method are introduced. To investigate the effects of punch velocity and mass scaling, the various values of punch velocity and the various mass scalings are used for numerical analysis. Computations are carried out for analysis of complicated auto-body panel stamping processes such as forming of an oil pan and a fuel tank.

Study of Analyzing Roof Panel Using Static Implicit Finite Element Method (정적-내연적 유한요소법을 이용한 Roof 판넬 해석에 관한 연구)

  • Ahn Hyun-Gil;Jung Dong-Won
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.3 s.168
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    • pp.78-85
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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.

Development of Stamping Process Optimization System: Integration of Optimal Blank Design and Optimal Nesting (스템핑 공정 최적화 시스템의 개발 : 최적블랭크 설계와 최적배치의 일체화)

  • 심현보;이상헌;박종규;김흥업
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.283-287
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    • 2003
  • In recent years, design of an optimal blank shape is very important for sheet metal forming process in the automobile industry because the raw material cost rate is significant part in the automobile industry. With the design of an optimal blank shape, the engineer can protect a blank from an excessive holding force to improve the quality and reduce the ratio of material scrap. Therefore design of an optimal blank shape is inevitable in sheet metal forming process. However, if it causes a complicated shape of blank, it may be difficult to do the blank layout optimally. In this study, we developed software of optimal blank layout connected with the software of optimal blank shape design which was created in the past by the present authors. And by using these softwares, we would like to present the method in order to get optimal utilization ratio easily and precisely within short time for the sequence of works from design to blank layout.

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Blank Shape Design Process for a Hot Stamped Front Pillar and its Experimental Verification (프론트필러의 핫스템핑 공정설계를 위한 블랭크형상의 최적화 연구)

  • Kim, J.T.;Kim, B.M.;Kang, C.G.
    • Transactions of Materials Processing
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    • v.21 no.3
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    • pp.186-194
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    • 2012
  • Hot stamping is a forming method that offers various advantages such as superior mechanical properties, good formability, and very small springback. However, relatively large-sized parts, such as front pillars, exhibit poor formability when hot stamped due to the limited material flow and thickness reduction imparted by the process. This reduction in thickness can also lead to cracks. One of the reasons is the relatively high friction between the sheet and the die. In this study, in order to obtain the optimal conditions for hot stamping of front pillars, various process parameters were studied and analyzed using the sheet forming software, J-STAMP. The effects of various parameters such as the die structure, blank shape, blank holding force, punch speed, clearance(upper and lower dies) and distance block were analyzed and compared.