轴向补料对双金属薄壁管冲击液压成形影响的研究

双金属薄壁管冲击液压胀形技术是在液压胀形与冲压成形基础上发展起来的一种复合成形技术。为了获取更好的成形质量，在液压预成形与冲击液压成形相结合的基础上，通过改变液压预成形的加载路径实现双金属薄壁管成形。介绍双金属薄壁管冲击液压成形原理及内管轴向补料方案；利用Dynaform有限元分析内管轴向补料距离对双金属薄壁管壁厚分布的影响，获得轴向补料距离对双金属薄壁管成形规律；同时，分析内管轴向补料距离对管材中截面的对角线长度变化影响规律，从而获得内管轴向补料距离对双金属薄壁管填充性的影响。通过液压预成形阶段加载路径的研究，探明了轴向补料对双金属薄壁管成形规律的影响，为冲击液压载荷作用下的双金属薄壁管成形提供理论与应用支撑。

Study on the Influence of Axial Feeding on the Liquid Impact Forming of Double Metal Thin-Walled Tubes

Liquid impact forming(LIF)of double thin-walled tubes is a compound forming technology developed on the basis of tube hydroforming (THF) and stamping forming. In order to obtain better forming quality, based on the combination of hydraulic pre-forming and liquid impact forming, double thin-walled tubes forming was realized by changing the loading path of hydraulic pre-forming. The liquid impact forming principle of double thin-walled tubes and the axial feeding scheme of inner tube were introduced. The influence of axial feeding distance on the thickness distribution of double thin-walled tubes was analyzed by Dynaform finite element method, and the influence law of axial feeding distance on the formability of double thin-walled tubes was obtained.At the same time, the influence of the axial feeding distance of the inner tube on the diagonal length of the tube section was analyzed, and the influence of the axial feeding distance of the inner tube on the filling property of the double thin-walled tube was obtained. Through the study of the loading path in the hydraulic pre-forming stage, the influence of axial feeding on the forming law of double thin-walled tubes is explored, which provides theoretical and application support for the forming of double thin-walled tubes under the impact hydraulic load.