In order to study the effect of pre-hem steel stopping position on boundary roll-in, the hemming process of a front door was analyzed and modeled based on AutoForm. Relative stroke was defined to quantify the pre-hem steel stopping position. The analysis result was also verified by the experiments on the hemming machine, and a method of adjusting boundary roll-in was proposed based on the numerical and experimental analysis. The investigation shows that the boundary roll-in increases with the increase of the relative stroke, but the increasing process is non-linear. When the pre-hem steel has under stroke, the influence of the relative stroke on the boundary roll-in is relatively small. While a quadratic function fits the relation between boundary roll-in and relative stroke well when the pre-hem steel has over stroke.
LI Dongwei, WANG Lei, ZHANG Cong, ZHAO Yixi
. Analysis of the Effect of Pre-Hem Steel Stopping
Position on Boundary Roll-in[J]. Journal of Shanghai Jiaotong University, 2019
, 53(1)
: 100
-104
.
DOI: 10.16183/j.cnki.jsjtu.2019.01.014
［1］KASTLE C, LIEWALD M. Virtual production planning and dimensional accuracy prediction of sheet metal components in the bodyshell work［C］∥14 Internationales Stuttgarter Symposium. Wiesbaden, Germany: Springer, 2014: 227-239.
［2］KULKARNI H T, WANG Y, ALANOLY J. Effective application of CAE guidance for hemmed closures throughout the vehicle development process ［EB/OL］. ［2017-07-03］. https:∥doi.org/10.4271/2017-01-1310.
［3］LIN J G, ZHOU G R, WANG J Q, et al. FEA-simulation of automobile sheet metal hemming process ［J］. Applied Mechanics and Materials, 2014, 602-605: 86-89.
［4］周光瑞. 桌式包边专机的车身开启件包边技术［D］. 合肥: 合肥工业大学, 2015.
ZHOU Guangrui. Hemming process for autobody closure of the table-top hemming machine ［D］. Hefei: Hefei University of Technology, 2015.
［5］WANINTRADUL C, GOLOVASHCHENKO S F, GILLARD A J, et al. Hemming process with counteraction force to prevent creepage ［J］. Journal of Manufacturing Processes, 2014, 16(3): 379-390.
［6］LIVATYALI H, MUDERRISOGLU A, AHMETOGLU M A, et al. Improvement of hem quality by optimizing flanging and pre-hemming operations using computer aided die design［J］. Journal of Materials Processing Technology, 2000, 98(1): 41-52.
［7］张学东, 董湘怀. 平面直边包边工艺的有限元分析［J］. 模具技术, 2009(3): 1-4.
ZHANG Xuedong, DONG Xianghuai. FE analysis of flat surface-flat edge hemming process ［J］. Die and Mould Technology, 2009 (3): 1-4.
［8］ZHANG G, WU X, HU S J. A study on fundamental mechanisms of warp and recoil in hemming ［J］. Journal of Engineering Materials and Technology, 2001, 123(4): 436-441.
