• Title/Summary/Keyword: Hemming

Search Result 44, Processing Time 1.898 seconds

Development of Automatic Drawing Program for Hemming Unit by AutoCAD (AutoCAD를 이용한 자동차용 헤밍 유닛의 자동작도 프로그램 개발)

  • Kim, D.S.;Song, Y.J.;Chung, H.;Kim, Y.B.;Hahn, Y.H.
    • Transactions of Materials Processing
    • /
    • v.16 no.3 s.93
    • /
    • pp.163-171
    • /
    • 2007
  • Due to the complicated character of the hemming process for automobile panels, it is very difficult to setup a consistent and reliable die design guide rule that require subtle decision of experienced experts and multiple trials during hemming die design and making. In this paper an automatic die design system of hemming units is pursued by presenting some algorithms, in which geometric data and constraints of the hemming units were converted to formula. The geometries and kinematics of all part for two kinds of hemming units, 2-link type and 4-link type were analysed kinematically to build the design algorithm. The algorithms were verified by automatic drawing used AutoCAD VBA program in example for the hemming unit design of a bonnet.

Finite Element Analysis of the Robot Roller Hemming (로봇 롤러 헤밍의 유한요소해석)

  • Chu, Seok-Jae;Kang, Min-Jun
    • Proceedings of the KSME Conference
    • /
    • 2008.11a
    • /
    • pp.475-480
    • /
    • 2008
  • Hemming, especially curl hemming, is required along the wheel housing for safety. Robot roller hemming is suitable for it. In this paper, both the flat hemming and the curl hemming along either the straight profile or the curved profile are analyzed using finite element program MSC.Marc to verify the hemming test results. Both the inner panel and the outer panel are modeled using 3-D solid elements and the roler is modeled using rigid surface. In the curl hemming, there is a case that the curl is not formed if the pre-hemming force is not sufficient. It agrees with the test results.

  • PDF

Kinematic Motion Analysis for Automatic Hemming Unit Design of Car Panel (자동차 패널 헤밍유닛의 설계자동화를 위한 기구학적 해석)

  • Kim, D.J.;Chung, H.;Song, Y.J.;Hahn, Y.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2006.05a
    • /
    • pp.438-445
    • /
    • 2006
  • Due to the complicated character of the hemming process for automobile panels, it is very difficult to set up a consistent and reliable die design guide rule that does not require subtle decision of experienced experts during design stage and multiple trials during hemming die making. In this paper an automatic die design system of hemming units is pursued by presenting some algorithms, in which geometric data and constraints of the hemming units were converted to formula. two kinds of hemming units, 2-link type and 4-link type, were selected as examples and the geometries and kinematics of all parts were analyzed to build the design algorithm.

  • PDF

Automatic Generation of Timing Chart for Car Panel Hemming Die Design (자동차 패널용 헤밍 금형설계를 위한 타이밍차트 자동생성)

  • Kim, D.J.;Song, Y.J.;Chung, H.;Han, Y.H.
    • Transactions of Materials Processing
    • /
    • v.15 no.7 s.88
    • /
    • pp.496-503
    • /
    • 2006
  • The inner and outer car panels for bonnet, door, and trunk lid are assembled by hemming rather than welding. To achieve successful fabrication of these panels, the complicated timing chart of hemming units for pre-and main hemming stages should be made to optimal one. In this study, a design system for automatic timing chart generation is developed. Using AutoCAD VBA and EXCEL data chart, hemming die design parameters and guidelines were put into the program to give hemming unit drawings and consequent timing charts. Then the prepared timing charts were checked and modified. The effectiveness of the system is verified by applying it successfully to hemming unit design for bonnet panel joining.

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
    • /
    • v.19 no.5
    • /
    • pp.29-35
    • /
    • 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.

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
    • /
    • v.25 no.5
    • /
    • pp.325-331
    • /
    • 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.

Comparison of Hybrid Hemming and Roller Hemming Using Finite Element Analysis (유한요소해석을 이용한 하이브리드 헤밍과 롤러 헤밍의 비교)

  • Jo, D.S.;Oh, M.H.;Kim, R.H.;Kim, J.H.
    • Transactions of Materials Processing
    • /
    • v.30 no.3
    • /
    • pp.119-124
    • /
    • 2021
  • In this study, the hybrid and roller hemming processes of aluminum alloy sheets were compared using the finite element analysis. The aluminum alloy 6014-T4 sheet with a thickness of 1 mm was used for the hemming process. The mechanical properties of the aluminum sheet obtained through a uniaxial tensile test were used for the simulation. The finite element analysis of hybrid and roller hemming was performed using a commercial software (ABAQUS) by the use of the mechanical properties. The finite element simulation results showed that the hybrid hemming holds an advantage over the roller hemming in terms of the dimensional accuracy

Hemming Process Design of the Permalloy Shielding Can for the Stiffness (퍼멀로이 실딩캔의 강성증대를 위한 헤밍공정 설계)

  • 조형근;김동환;이선봉;김병민
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2000.11a
    • /
    • pp.628-632
    • /
    • 2000
  • In the recent day, shielding can was made of permalloy materials for automobile display instrument. The good roundness has an effect on magnetic property such as the low coercivity and the high permeability. But the products having the roundness is transformed by the heat treatment, the sending to the company and the assembly process. So for the stiffness of the edge, it is necessary for hemming process to be added in the deep drawing process. And it has the good appearance to create a smooth edge rather than a razor edge with urr. In this paper, it is controlled to get the best hemming product by the Pre-hemming angle($105^{\circ}$, $120^{\circ}$, $135^{\circ}$). And Possible process and tool design modification, which may lead to quality improvement in hemming were tested experimentally and using FEM. The commercial finite element program PAM-STAMPTM was used to simulate the pre-hemming process and hemming process, and the predictions were compared with experimental results according to the pre-hemming angle.

  • PDF

Numerical Evaluation of Hemming Defects Found on Automotive Door Panels (유한요소해석에 의한 자동차 도어패널의 헤밍 결함 평가)

  • Seo, O.S;Jeon, K.Y;Rhie, C.H;Kim, H.Y
    • Transactions of Materials Processing
    • /
    • v.24 no.4
    • /
    • pp.280-286
    • /
    • 2015
  • Hemming is used to connect two sheet metal components by folding the edge of an outer panel around an inner panel to create a smooth edge. The minimization of hemming defects is critical to the final quality of automobile products because hemming is one of the last operations during fabrication. Designing the hemmed part is not easy and is influenced by the geometry of the bent part. Therefore, the main problem for automotive parts is dimensional accuracy since formed products often deviate geometrically due to large springback. Few numerical approaches using 3-dimensional finite element model have been applied to hemming due to the small element size which is needed to properly capture the bending behavior of the sheet around small die corner and the comparatively big size of automotive opening parts, such as doors, hoods and deck lids. The current study concentrates on the 3-dimensional numerical simulation of hemming for an automotive door. The relationship between the design parameters of the hemming operation and the height difference defect is shown. Quality improvement of the automotive door can be increased through the study of model parameters.

A Study on the impact on the quality of hemming the number of hemming process (헤밍 공정의 횟수가 헤밍 품질에 미치는 영향에 관한 연구)

  • Shin, Na-Eun;Choi, Moon-Ho;Choi, Young-Deok;Choi, Hae-Un;Jang, Rae-Seong;Choi, Kye-Kwang;Kim, Sei-Hwan;Yun, Jae-Woong;Lee, Chun-Kyu
    • Design & Manufacturing
    • /
    • v.10 no.1
    • /
    • pp.26-30
    • /
    • 2016
  • In this study, it was investigated by comparing the experimental hemming by the 3 steps and 2 steps in order to stabilize the quality of the hemming process. In the experimental results, the three-step hemming superior to the two-step one and the dimensional stability of part that was made by the three-step on was high. When the second stage Hemming has been found that the deflection caused by the force to the wear of the punch becomes larger plane can be folded by the hemming crimping and crimp uncertain.