薄壁结构件毛坯去应力分析与铣削加工变形有限元模拟研究
Study on Stress Relief Analysis and Deformation of Thin-walled Structural Parts in Milling by Using Finite Element Method
徐飞飞 1刘其广 1吕杰 1金鑫1
作者信息
- 1. 北京航空材料研究院股份有限公司,北京 100095
- 折叠
摘要
薄壁件在航空航天领域应用广泛,其制造精度直接决定了装备的服役性能.然而,由于热处理的影响,导致薄壁件在加工之前存在残余应力.如果控制不当极易导致零件超差.因此,本文以7075 铝合金板材为研究对象,分析了残余应力在板料淬火与预拉伸时产生的原理.进一步,采用有限元方法作为工具,对7075 毛坯在淬火和预拉伸法过程中残余应力的产生进行了模拟.通过模拟发现,当毛坯件被拉伸约3%,塑性应变量约为2.4%时,淬火残余应力消除可达91.2%.在降低残余应力的基础上,本文建立了薄壁结构件铣削加工仿真模型,模拟了多因素耦合作用下的铣削加工变形,并通过铣削实验验证了仿真结果的正确性.
Abstract
Thin-walled parts are widely used in aerospace applications,and their manufacturing accuracy directly determines the performance of the equipment in service.However,the effect of the heat treatment leads to the existence of residual stresses in thin-walled parts prior to machining.If not properly controlled,it is very easy to cause the part to exceed the tolerance.Therefore,for 7075 aluminum alloy sheet,the principle of residual stresses generated in the quenching and pre-stretching of the sheet is analyzed.Furthermore,the generation process of residual stresses in 7075 aluminum alloy blanks in the quenching process and pre-stretching is simulated by using the finite element method.It was found that the quenched residual stresses were reduced up to 91.2%when the blank was stretched by about 3%with a plastic strain of about 2.4%.According to the reduction of residual stresses,a simulation model for milling of thin-walled structural parts is established to simulate the milling deformation under the coupling effect of the multiple factors.The correctness of the simulation results is verified by using the milling experiments.
关键词
去应力/薄壁结构件/有限元模拟/残余应力/加工变形Key words
stress relief/thin-walled structure part/finite element simulation/residual stress/machining distortion引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据