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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。
In order to improve the forming performance of the tailor welded plate, the forming characteristics of the tailor welded plate can be controlled by changing the friction between the die and the sheet during the forming process. With the ultimate bulge height test as the research object, the mechanics mechanism of the influence of the friction coefficient on the forming behavior of the tailor welded plate was analyzed by the theoretical method. The influence of friction coefficient on the ultimate bulging height, weld movement and strain distribution of the tailor-welded blanket was studied by combining the experiment and the finite element method. The results show that the coefficient of friction has a significant effect on the forming behavior of the tailor welded plate. With the increase of the friction coefficient, the ultimate bulging height first increases and then decreases, while the weld movement decreases. The main strain When the friction coefficient increases to a certain value, the ultimate strain position suddenly changes from the welding seam adjacent position to the thin side base metal about 30.0mm away from the welding seam, and the failure mode of the welding blanket changes.