1. 上海交通大学 上海市复杂薄板结构数字化制造重点实验室， 上海 200240；2. 上汽大众汽车有限公司， 上海 201805
出版日期:2019-01-28发布日期:2019-01-28通讯作者:赵亦希，女，博士，副教授，电话(Tel.)：021-34206304；E-mail: yxzhao@sjtu.edu.cn.作者简介:李东玮(1993-)，男，山西省大同市人，硕士生，主要研究方向为薄板成形与汽车包边工艺.Analysis of the Effect of Pre-Hem Steel Stopping Position on Boundary Roll-in
LI Dongwei,WANG Lei,ZHANG Cong,ZHAO Yixi1. 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:2019-01-28Published:2019-01-28摘要/Abstract
摘要： 为探究包边过程的预折刀工作终止位置对包边边界缩进的影响规律，以某车型前门的包边过程为研究对象，基于AutoForm软件建立有限元模型，定义了预折刀相对进给量以量化表述预折刀工作终止位置，并在包边机上进行验证实验，在此基础上提出了包边边界缩进的调整流程.结果表明：随着预折刀相对进给量不断增加，包边边界缩进逐渐增大，但并非呈线性增长；当预折刀处于欠进给时，随着预折刀相对进给量的增加，包边边界缩进增量很小；当预折刀处于过进给时，利用2次函数可以拟合包边边界缩进与预折刀相对进给量的关系.
关键词: 汽车板材, 包边, 边界缩进, 预折刀, 有限元分析
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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