锻压技术

摩擦对汽车零件拼焊板成形行为影响

英文标题：Friction effect on forming behaviors of tailor welded blanks for auto parts

作者：陈水生王裕清张高峰

单位：河南理工大学

分类号：TG386

出版年,卷(期):页码：2013,38(3):34-37

摘要：

为了提高拼焊板成形性能，通过改变成形过程中模具与板料之间的摩擦以控制其成形特征。以极限胀形高度试验为研究对象，采用理论方法分析了摩擦系数对拼焊板成形行为影响的力学机制。结合试验和有限元法研究了摩擦系数对拼焊板极限胀形高度、焊缝移动及应变分布等的影响。结果表明：摩擦系数对拼焊板成形行为有显著影响，随着摩擦系数的增大，极限胀形高度先增大后逐渐减小，而焊缝移动量则一直减小，拼焊板主应变分布逐渐变得均匀；当摩擦系数增大到一定值时，极限应变位置突然从焊缝临近位置转变为距焊缝约30.0mm位置的薄侧母材上，拼焊板失效模式发生了变化。

To improve the formability of tailor welded blanks (TWBs), friction coefficient between TWBs and tools was controlled to capture the needed forming characteristics. In the case of limit dome height (LDH) test, theoretical analysis was performed to probe the mechanical influence mechanism of friction coefficient on the forming behaviors of TWBs. And the experiment and finite element method were employed to study the effect of friction coefficient on LDH, the weld movement and the strain distribution of TWBs. The results indicate that friction coefficient has a robust effect on the forming characteristics of TWBs. With the increase of friction coefficient, LDH increases first and then decreases; the weld movement always drops; the principal strain becomes uniform. When friction coefficient reaches a certain value, the limit strain namely, the rupture position moves from the area near the weld to 30 mm offset from the weld and the failure mode of TWBs changes.

基金项目：

国家自然科学基金资助项目(U1261115)

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