锻压技术

环形蒙皮零件的被动式充液成形技术

英文标题：Passive hydroforming technology for ring-shaped skin parts

作者：李奎刘波邱超斌鲁帆

分类号：TG39

出版年,卷(期):页码：2022,47(3):103-108

摘要：

为解决大尺寸复杂曲度蒙皮类零件成形过程中产生的起皱及回弹现象，针对环形蒙皮类零件开展被动式充液成形技术的研究。通过有限元分析发现，液体压力可以显著改变唇口外侧的应力状态，对悬空区的起皱现象的抑制效果明显，在最大液体压力达到4 MPa时，环形蒙皮外侧无起皱现象。液体压力较小时，径向、周向应力达到峰值时，零件起皱高度最大，在一定压力范围内随着压力的增加，环形蒙皮外侧的周向、径向应力趋于固定值，使得唇口零件外侧处于拉-拉的应力状态条件，更有利于零件的成形。同时，随着压力的增加，板料内、外侧位移的绝对值逐渐减小，直至趋于固定值，液体压力可有效抑制板料与凸模的相对滑动，使得环形蒙皮零件的内、外侧板料的流动更加均匀。

In order to solve the wrinkling and springback phenomenon generated in the forming process of large-scale complex curvature skin parts, the passive hydroforming technology for ring-shaped skin parts was studied. The finite element analysis shows that the liquid pressure can significantly change the stress state on the outside of lip, and the suppression effect on the wrinkling phenomenon in the suspended area is obvious. When the maximum liquid pressure reaches 4 MPa, there is no wrinkling phenomenon on the outside of ring-shaped skin part. However, when the liquid pressure is low, the wrinkle height of part is the highest when the radial and circumferential stresses reach the peak values, and the circumferential and radial stresses on the outside of ring-shaped skin part tend to a fixed value with the increasing of the pressure within a certain pressure range, which makes the outside of lip part in the tension-tension stress condition and is more conducive to the forming of part. At the same time, with the increasing of pressure, the absolute values of inner and outer displacements of sheet metal gradually decrease until they tend to a fixed value. Thus, the liquid pressure can effectively restrain the relative sliding between sheet metal and punch, which makes the flow of inner and outer sheet materials for ring-shaped skin parts more uniform.

基金项目：

作者简介：李奎（1989-），男，硕士，工程师 E-mail：615804786@qq.com

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