Analysis and optimization of precision control for selective laser melting forming of thin-walled parts
In order to solve the deformation problem of thin-walled parts caused by residual stress during the Selective Laser Melting (SLM) process and ensure forming accuracy, this paper takes the titanium alloy radar shielding device prepared by SLM as the research object and employs the inherent strain method to analyze its deformation and stress.It proposes an anti-deformation compensation method based on the voxel simulation model and experimentally verify the method.Selective Laser Melting (Selective Laser Melting) is one of the most mature and widely used metal additive manufacturing technologies in Additive Manufacturing (AM) , which uses a high energy density laser beam as a heat source to melt metal powder layer by layer according to the slicing pattern with the assistance of computer software, and ultimately accumulates and forms dense three-dimensional solid parts, the printed parts have high precision, complex structure and high material utilization, and are now widely used in aviation, aerospace, energy, automotive and other fields.However, the uneven temperature gradient caused by the rapid heat melting and cooling solidification of metal powder in the SLM forming process gives rise to large residual stresses.Although there has been much research on reducing residual stress and controlling forming accuracy, researchers have not completely solved the deformation problem of thin-walled parts in the SLM process.On the one hand, due to the special structure of thin-walled parts, their indication accuracy requirements are also higher, and it is difficult to use in actual production because of the high cost of the way of experimental measurements;on the other hand, it takes a lot of computational and time costs in model simulation and computational compensation.Based on the intrinsic strain method, it calculates the stress field and deformation of the TC4 radar shielding device prepared in SLM and proposes an anti-deformation compensation method based on the voxel grid simulation model to solve the anti-deformation compensation model quickly.The results show that the residual stresses and displacements of the shielding device prepared in SLM are 831 MPa and 0.61 mm respectively.After the anti-deformation compensation, the overall deformation deviation of the surface area of the shielding device decreases from 0.582 mm to within 0.438 mm, and the accuracy improves by 24.7％, which ensures the print quality of the shielding device.
selective laser meltinginherent strain methodfinite element analysisreverse deformation compensation
国家科技期刊平台
NSTL
万方数据
