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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;Shanghai Key Laboratory of Digital Manufacturing for Thin-Walled Structure,Shanghai Jiao Tong University;SAIC Volkswagen Automotive Co.,Ltd.;  
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.
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