锻压技术

波纹曲面冷压对7050铝合金带筋厚板残余应力的影响

英文标题：Influence of cold pressing with corrugated surface on residual stress for 7050 aluminum alloy thick plate with ribs

作者：李晨1 张新全1 向阳2 袁武华2

单位：1. 中国航空工业集团公司 2. 湖南大学

关键词：7050铝合金波纹曲面淬火冷压变形量残余应力

分类号：TG166.3；TG115.22

出版年,卷(期):页码：2022,47(4):119-125

摘要：

通过淬火、冷压试验和有限元模拟，研究了波纹曲面结构对7050铝合金带筋厚板淬火、冷压后消减残余应力的影响规律，分析了变形量、波纹方向及波纹形状对冷压后残余应力消减效果的影响。结果表明，波纹曲面结构对淬火残余应力分布的影响不明显，冷压后残余应力得到了较大消减。随着变形量的增大，筋条及试样两侧棱位置的压应力区面积及应力值下降，波谷位置的应力值逐步增加；受筋条对金属流动的影响，宽度方向波纹比长度方向的波纹更有利于冷压后残余应力的消减；瓦楞式波纹残余应力的消减效果优于对称式波纹，整体分布更加均匀。从研究结果可知，宽度方向采用瓦楞式波纹结构，冷压变形量为3%时，7050带筋铝合金厚板可以得到较好的残余应力消减效果。

Through quenching test, cold pressing test and finite element simulation, the influence law of corrugated surface structure on residual stress reduction after quenching and cold pressing of 7050 aluminum alloy thick plate with ribs was studied, and the influences of deformation amount, corrugation direction and corrugation shape on the residual stress reduction effect after the cold pressing were analyzed. The results show that the corrugated surface structure has no obvious effect on the distribution of quenching residual stress, but the residual stress is greatly reduced after cold pressing. With the increasing of the deformation amount, the area and stress value of the compressive stress zone at the rib and edge positions on both sides of sample decrease, and the stress value at the trough position increases gradually. Significantly, due to the influence of the ribs on the metal flow, the corrugation in width direction is more conducive to the reduction of residual stress after cold pressing than the length direction. Finally, the residual stress reduction effect of corrugated corrugation is better than that of symmetrical corrugation, and the overall distribution is more uniform. Thus, when the cold pressing deformation amount is 3% and the corrugated corrugation structure is used in the width direction, a better residual stress reduction effect can be obtained of 7050 aluminum alloy thick plate with ribs.

基金项目：

作者简介：李晨（1983-），女，硕士，高级工程师 E-mail：lichen_1983_2002@163.com 通信作者：袁武华（1973-），男，博士，教授 E-mail：yuan46302@163.com

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