Research On Slicing Algorithm Of Continuous Fiber Composites 3D Printing And Implementation On Service Platform

Recently,3D printing has been rapidly developed and widely used because the characteristics of integrated forming,and not limited by the complexity of the model.The "made in China 2025" also points out the importance of 3D printing technology.Continuous fiber reinforced thermoplastic plastics(CFRTP)is a kind of structural material,which is made of carbon fiber and resin,ceramic,etc.,it has the advantages of high density,rigidity,weight and fatigue property.The application of continuous fiber composites and 3D printing technology can be used in industrial field,and can give full play to the advantages of excellent material properties and rapid prototyping.3D model slicing technique is one of the key technologies of 3D printing.The result of slicing process has a very important influence on the forming quality of 3D model.Because of the orientation and continuity of continuous carbon fiber reinforced composites,the traditional slicing technology is not applicable.This paper focuses on the research of 3D model slicing technique according to the material properties of continuous fiber composites,and through the construction of reasonable storage and search structure,improve efficiency of the model files processing.The main research work is as follows:(1)In order to promote the efficiency of slicing process,which is influenced by a large number of redundant data and the lack of topological information between the triangles in STL files,improve redundancy vertex merging method based on hash table.Using the data structure which is combined with dynamic and static arrays to store the non redundant points and face information,and reconstructing the topological information of the model,to improve the efficiency of slicing process and reduce the space occupation of the program operation,which contributes to improve the convenient and efficiency of subsequent process and provides the basis for the application of slicing technique on the service platform.Through several models to show the validity of the improvement.(2)According to the anisotropy of continuous carbon fiber composites,adjust the slicing direction of 3D model based on the forced direction of the model,and realize the slicing method of fixed layer thickness.Through the experiments show the validity of the method and the model data after topological reconstruction.(3)According to the continuity of continuous carbon fiber composites,design a kind of spiral offset infill path.For each layer,do the spiral processing between infill path belonging to the same region on the basis of generating offset infill path.For convex polygon contours,realize the infill path without jumping at one layer.For concave polygon contours and polygons with holes,realize the local non-jumping path.Compare with other infill paths aiming at continuity,and use instances to verify the validity and feasibility of the method.(4)Design and implement 3D printing service platform.The 3D printing service platform is composed of online service of slicing process,model library,and user management system.The service platform adopts S2SH(Struts2+Spring+Hibernate)framework,using MySQL database to storage sections of relevant parameters,information of users and models on the platform,and through WebGL technology to implement online model preview module.