基于有限元模拟研究选区激光熔化成形薄壁件反向变形补偿  

Research on Reverse Deformation Compensation of Thin-Walled Parts Formed by Selective Laser Melting Based on Finite Element Simulation

作　　者：赵小康 王联波 王占勇 ZHAO Xiaokang;WANG Lianbo;WANG Zhanyong(School of Materials Science and Engineering,Shanghai Institute of Technology,Shanghai 200000,China)

机构地区：[1]上海应用技术大学材料科学与工程学院,上海200000

出　　处：《机械工程材料》2024年第8期101-106,共6页Materials For Mechanical Engineering

摘　　要：采用有限元方法模拟了壁厚1mm的GH4169镍基高温合金激光选区熔化成形薄壁圆筒的等效应力场和变形场,对有限元模型进行了不同迭代次数的反向变形补偿,研究了迭代次数对变形场的影响,并进行了试验验证。结果表明:薄壁圆筒试样的变形量呈中部、底部和顶部依次减小的趋势,等效应力呈底部、中部和顶部依次减小的趋势,当高度为90mm时,变形量最大,等效应力最小,分别约为0.485mm,341MPa;试验所得变形量与模拟值的相对误差小于10%,说明有限元模型的变形场可以近似用作反向变形补偿的计算依据;随着反向变形补偿迭代次数增加,有限元模型的变形量逐渐趋近于0;将两次迭代后的模型导出并进行激光选区熔化成形,所得薄壁圆筒的变形量在±200μm内,相比反向变形补偿前降低了60%。The equivalent stress field and deformation field of GH4169 nickel-based superalloy thin-walled cylinder with thickness of 1 mm formed by selective laser melting were simulated by finite element method.Reverse deformation compensation was performed on the finite element model with different interation times,and the influence of iteration times on the deformation field was studied.And the test was carried out to verify.The results show that the deformation of thin-walled cylinder samples decreased in the middle,bottom and top successively,and the equivalent stress decreased in the bottom,middle and top successively.When the height was 90 mm,the deformation was the largest and the equivalent stress was the smallest,which were about 0.485 mm and 341 MPa respectively.The relative error between deformation obtained by test and the simulation value was less than 10%,accounting that the deformation field of the finite element model could be used as the basis for the calculation of reverse deformation compensation.With the increase of reverse deformation compensation iterations,the deformation of the finite element model gradually approached to 0,The model after two iterations was derived and then formed by selective laser melting,and the deformation of the thin-walled cylinde was within±200μm,which was 60%lower than that before reverse deformation compensation.

关 键 词：激光选区熔化 薄壁圆筒 应力 变形 变形补偿 

分 类 号：TH164[机械工程—机械制造及自动化] TP399[自动化与计算机技术—计算机应用技术]