Research On Quality Inspection Method Of Lattice Structure For Additive Manufacturing Based On ICT

As a lightweight functional structure with great potential,the additive manufacturing lattice structure has received extensive attention in the aerospace and lightweight fields.The inspection of manufacturing quality is a necessary part for the lattice structure to move towards technical maturity,and is also one of the main factors hindering the rapid development of the lattice structure.With the help of ICT non-destructive testing technology,the quality inspection methods of lattice structure in additive manufacturing are studied,and the specific content is as follows:(1)Aiming at the ICT dimensional measurements accuracy evaluation technology,a multi-sphere standard was first prepared to study the impact of the kind of rod’s material,the spatial distribution of the ruby spheres and the selection of test lengths on accuracy evaluation.The experimental data show that ceramic is more suitable as a rod’s material than carbon fiber.The distribution of the bat has no significant effect on the accuracy evaluation,but the difference in the selection method of the size will cause a large difference in the evaluation results.Then through the hole plate standard,the ICT dimensional measurement error is evaluated.The results show that the maximum permissible error of the ICT can reach ±(50 + L/400)μm,which meets the testing requirements of this thesis;(2)Aiming at the periodic spacing detection technology of lattice structure,a space detection algorithm based on skeleton template feature matching was proposed.Firstly,the lattice skeleton model is constructed by the mesh shrinking algorithm.Then,template feature matching method is used to extract the center point of lattice unit,and the measurement of its spacing is achieved.The experimental results show that the skeleton template feature matching method can realize the measurement of the internal and external dimensions of the lattice structure,which has the advantages of high efficiency and good stability;(3)Aiming at the surface quality detection technology of lattice structure,the parallel acceleration of point-to-point and point-to-surface ICP matching algorithms based on CUDA was realized.Then it is proposed that the evaluation of the manufacturing quality of the lattice structure should integrate periodic spacing and surface quality.Finally,based on Qt and VTK,a software platform for lattice structure quality detection was developed,and the related algorithms studied in this thesis were integrated into the software as functional modules to serve practical engineering applications.