• Title/Summary/Keyword: 헤밍 공정

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A Study on Improvement of Bending Quality of Hemmed Plates in Sheet Metal Forming (헤밍 (Hemming) 구조를 가진 박판의 굽힘품질 개선에 관한 연구)

  • Kim, Pan Gun;Park, Sang Hu
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.12
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    • pp.1360-1367
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    • 2012
  • A bending process is considered as one of fundamental sheet metal forming processes, and it is widely used for fabrication of simple or complicated sheet metal products in industrial fields. Most of automobiles and electronics have many parts made by the bending process inside or outside of them. However, till now, there is few research reports on the bending process of hemmed plates. A hemmed plate has a locally different bending strength, so a waving shape occurs after bending. A poor outlook due to local uneven shape influences greatly on product competitiveness. To settle this problem, we studied the bending parameters of a hemmed plate and showed the major sensitive design-parameters on the bending quality.

Parametric Study of Hemming Process and Evaluation of Hem Quality Using Simple Models (간이 모델을 이용한 헤밍 공정 변수 연구 및 헤밍 품질 평가)

  • 최원목;임재규;박춘달;김형종
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.10a
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    • pp.113-116
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    • 2003
  • Hem quality can be determined mainly by turn-down and roll-in. Turn-down, that is created by the elastic recovery, can't be easily detected and measured since it is usually as small as 0.03 m. This study is focused on the precise evaluation of the hemming defects through analytical and experimetal approaches, and on the investigation of the influence of process parameters on the final hem quality. Implicit finite element analysis of plane-strain hemming process is performed by using a commercial code ABAQUS/Standard. Experiment and measurement is also carried out for steel and aluminium sheet metals, and the results are compared with those of analysis.

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Hemming Process Design of the Permalloy Shielding Can for the Stiffness and Shape Accuracy (퍼멀로이 실딩캔의 강성증대 및 형상 정밀도를 위한 최적 헤밍 공정설계)

  • Lee, Sun-Bong;Kim, Dong-Hwan;Kim, Byung-Min
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.5
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    • pp.29-35
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    • 2002
  • This study shows the process design and forming analysis of permalloy shielding can that support the automobile multi-display parts to indicate the accurate information of car. This study is particularly important, since the accuracy of permalloy shielding can is known to affect the magnetic properties such as coercivity and permeability quite sensitively. The objective functions are defects such as hemming wind, hemming length, hemming wrap and tightness in prehemming process. The pre-hemming angle is considered as design parameter. The commercial finite element program PAM-STAMP™ was used to simulate the pre-hemming and hemming process. The ANN (Artificial Neural Network) has been implemented for minimizing of objective function and for investigating effect of punch angle relevant to the pre-hemming process. The results of analysis to validate the proposed design method are presented.

Finite Element Modeling of Flanging/Hemming Process for Automotive Panels (자동차 외판 플랜징/헤밍 공정에 대한 유한요소해석 모델링)

  • 김헌영;임희택;최광용;이우홍;박춘달
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2002.05a
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    • pp.103-107
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    • 2002
  • The 2nd forming process of flanging/hemming has recently many interest because it determines external quality of automobile. It is difficult to apply finite element simulation in flanging/hemming due to small element size which needs for expression of bending effect on the die corner and big model size of side door, back door, tank lid and like opening Parts. This paper shows the process of flanging/hemming simulation using finite element model for automotive panels. The explicit finite element program PAM-STAMP$\^$TM/ was used to simulate the flanging and hemming operations.

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Deformation Mechanism of the Roller Hemming Process with the Finite Element Analysis (유한요소해석을 이용한 롤러헤밍 공정의 변형기구 분석)

  • Rho, J.D.;Kwak, J.H.;Kim, S.H.;Ju, Y.H.;Kim, J.H.;Shin, H.S.
    • Transactions of Materials Processing
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    • v.25 no.5
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    • pp.325-331
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    • 2016
  • In this paper, a three-dimensional part model is constructed for the finite element analysis of hemming models where hemming defects frequently occur. The roller path is modeled as the boundary condition with the one-dimensional beam element and the revolute joint model. With the constructed part model and the roller movement, a finite element analysis has been pursued in order to identify the hemming load and hemming defects such as wrinkling in the flange region. The analysis result shows that the maximum hemming load occurs in the intake situation while oscillatory behavior of the load is found especially when hemming the curved model because of wrinkle generation. This paper compares the amplitude and the period of wrinkle between the analysis result and the experiment, which shows good agreement with each other.

A Study on the Design of Hemming Process for Automotive Body Panels (자동차 패널의 헤밍 공정 설계에 관한 연구)

  • 안덕찬;이경돈;인정제;김권희
    • Transactions of Materials Processing
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    • v.9 no.6
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    • pp.624-630
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    • 2000
  • Typical automotive opening parts, i. e. hood trunk lid and door, are made through the press operations such as drawing, trimming, flanging, and hemming. The dimensional accuracy of stamped panels is mainly dependent on the drawing operation. However, the gap between outer panels and opening parts, which is important to the appearance quality of the assembled body, is directly influenced by the flanging and hemming operation. In this study, the relation between the design parameters of the hemming operation and the defect of roll-in is shown. The effects of some design parameters on the gap are examined using CAE. furthermore, the simulated results of the hemmed part of tailgate comer are shown and discussed.

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The Die Design of STS304 Bezel Frame for The Strength Reinforcement in Hemming Process (강도보강용 STS304 베젤 프레임 헤밍 공정의 금형 설계)

  • Kim, G.H.;Lee, S.H.;Kim, B.M.
    • Transactions of Materials Processing
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    • v.17 no.6
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    • pp.436-442
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    • 2008
  • As the structure of a mobile phone becomes thin to catch up with a slim product trend, the structural strength and resistance to shock of TFT-LCD module are getting to be reduced. Hence, TFT-LCD module is the strength reinforced by bezel frame. The bezel frame was produced by the multi hemming processes with several folding parts. The determination of the optimal number of hemming part and structure of bezel frame are very important process parameter to obtain the strength of that. The effect of process parameters on strength of bezel frame was investigated by FEA. Based on the result of FEA, the experiment was performed using manufactured hemming die, the result of the experiment was compared with FEA and verified. Also, three point bending tests were performed to check the strength of bezel frame.