Research On The Algorithm Of Layered Slicing For Fused Deposition 3D Printing

Additive manufacturing,also known as 3D printing,has the characteristics of rapid prototyping,low cost,and high degree of flexibility.It is suitable for multi-variety and small batch production.It has been used in automobile manufacturing,aerospace manufacturing,marine engineering equipment,construction industry,food processing and biomedical fields have been widely used.Fused deposition modeling technology is one of the important production processes of 3D printing.The slicing process of its digital model directly affects the production and quality indicators such as the strength,molding accuracy and printing time of the part.This paper takes the slicing process of fused deposition modeling 3D model as the background,focusing on research on algorithm optimization and design of model layering and filling.Aiming at the problem that the traditional STL(Standard Template Library)model file has too much redundant information and the patches are not related to each other,the topology optimization of the STL model file is performed again.The storage structure of the hash linked list is used to store the point,line and surface data of the STL file,and the N-ary tree structure is used to encode the triangular facets,so as to establish the correlation between the facets and improve the speed of data reading and searching,to speed up subsequent layering and padding algorithms.A volume-optimized Fused Deposition Modeling(FDM)3D printing adaptive layering algorithm is proposed.Based on the analysis of the cause of the step effect that affects the surface accuracy of the workpiece in the FDM-3D process,through the data optimization of the angle between the triangular facet normal vector and the layering direction in the layering,based on the principle of volume optimization,the volume error The minimum layer thickness is determined,and the unequal thickness adaptive layer is realized.The algorithm takes into account the printing efficiency and the workpiece accuracy.Aiming at the problem that the filling process of the traditional filling algorithm is equal density filling and the strength of the finished part is poor,a variable density filling algorithm based on Delaunay triangulation is proposed.Firstly,the concave-polygon-convex decomposition is performed on the polygon filled area;then the filling density of each area is determined,and the filling points are collected by Poisson disk sampling;finally,the point set is generated into the Delaunay triangulation,that is,the filling route.The proposed algorithm was encapsulated into slicing software,and 3D printing experiments were carried out to verify the effectiveness of the algorithm.