一种新型压合衬套冷挤压工艺研究  

A Novel Cold Expansion Technology With Forcemate Bushing

作　　者：王耀伟 闫五柱[1] 梁淑静 WANG Yaowei;YAN Wuzhu;LIANG Shujing(School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi’an 710129,China)

机构地区：[1]西北工业大学力学与土木建筑学院,西安710129

出　　处：《航空制造技术》2024年第10期107-114,共8页Aeronautical Manufacturing Technology

摘　　要：压合衬套冷挤压工艺是通过拉拔过盈芯棒穿过紧固孔将衬套安装至孔壁的一种冷强化方法。对压合衬套冷挤压后残余应力分布不均匀现象进行研究,提出了一种新型压合衬套冷挤压方法。该方法通过在传统压合衬套内侧添加带斜度的辅助衬套,从而在芯棒拉拔过程中可以沿孔轴向同步施加均匀干涉量。通过有限元仿真,得到该方法在干涉量为1.5%、1.8%、2.0%、2.3%、2.5%时的残余应力分布,并与传统压合衬套冷挤压方法进行对比。研究结果表明,该方法在孔端不会产生残余拉应力,且残余应力更加均匀,残余压应力区更深。与传统冷挤压工艺相比,新工艺在干涉量为2.5%时疲劳寿命提高了33%,且该增益随干涉量增加而增强。Cold expansion technology with forcemate bushings is a coldworking method to install the forcemate bushing into the fastening hole by drawing the interference mandrel through the hole.A new cold expansion method with forcemate bushing is proposed to avoid the presence of non-uniform distribution of residual stress.The new method adds an auxiliary bushing with a slope on the inner side of the forcemamte bushing,and the slope of the bushing is the same as that of the mandrel,so that a uniform interference is applied along the axial direction of the hole.Throughfinite element simulations,the residual stress distribution obtained from the new method is compared with that of the traditional method on the expansion percentage of 1.5%,1.8%,2.0%,2.3%and 2.5%.The results show that the new method avoids the generation of residual tensile stress around the hole,the residual stress is more uniform and the residual compressive stress area is larger than that of the traditional method.Compared with the traditional cold expansion technology,the fatigue life is increased by 33%when the expansion amount of cold expansion is 2.5%,and this advantage increases with the increase of the interference.

关 键 词：紧固孔 冷挤压 残余应力 压合衬套 疲劳强化 有限元 

分 类 号：TG376.3[金属学及工艺—金属压力加工]