Journal of Shanghai Jiao Tong University ›› 2019, Vol. 53 ›› Issue (1): 100-104.doi: 10.16183/j.cnki.jsjtu.2019.01.014

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Analysis of the Effect of Pre-Hem Steel Stopping Position on Boundary Roll-in

LI Dongwei,WANG Lei,ZHANG Cong,ZHAO Yixi   

  1. 1. Shanghai Key Laboratory of Digital Manufacturing for Thin-Walled Structure, Shanghai Jiao Tong University, Shanghai 200240, China; 2. SAIC Volkswagen Automotive Co., Ltd., Shanghai 201805, China
  • Online:2019-01-28 Published:2019-01-28

Abstract: 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.

Key words: automobile sheet, hemming, boundary roll-in, pre-hem steel, finite element analysis

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