Simulation and Experimental Study of Deformation Control of Large-size and Thin-wall Parts by SLM
Simulate Additive software was used to simulate and analyze the additive manufacturing processes of a typical large-sized thin-walled component—exhaust pipe.The results show that the SLM formed exhaust pipe parts without constraints have high residual stress and significant deforma-tion.The post-processing releases residual stress in the parts,but the overall deformation of the parts further increases to 3.5 mm,with a maximum deformation of 9 mm.A lattice structure was intro-duced with high specific strength and stiffness as an auxiliary structure for controlling deformations,and a lattice processing scheme was designed with sufficient resistance to deformation and may be re-moved through post-processing.The cell type is QuadDiamond,the rod diameter is as 1.3 mm,the rod length is as 19 mm,and the width of the lattice region is about 60 mm.The SLM test results of the exhaust pipe parts under lattice constraints are quite consistent with the numerical simulation re-sults.The cloud image results of the three-dimensional scanning show that the overall deformation of the part is about 1 mm,and the maximum deformation does not exceed 2.5 mm,meeting the require-ments for the part use.The above results show the effectiveness of using lattice structure in deforma-tion control of large-sized thin-walled parts formed by SLM.
additive manufacturingselective laser melting(SLM)large-size and thin-wall partsimulation analysisdeformation controllattice structure
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