Research On Multi-layering Algorithm For Additive Manufacturing

Additive manufacturing adopts the processing method of layer-by-layer accumulation,which enables rapid prototyping of complex product structure,and has the advantages of short production cycle,high forming efficiency and on-demand production.At present,it has been widely used in many fields.In the process of additive manufacturing,the three-dimensional model needs to be converted into machinerecognizable instructions through data processing,so the data processing process has an important impact on the printing effect of additive manufacturing.Based on this,this thesis takes the FDM process as an example to conduct deeply research on the STL model data preprocessing and layering algorithm in the data processing process in additive manufacturing,focusing on ensuring the printing accuracy and improving the printing efficiency of the model,mainly completed the following work.First of all,the rules of STL model and the file format of STL model are deeply analyzed,and the two defects of STL model file lack of topology and data redundancy are expounded.In view of the lack of topology structure of STL model files,the topology structure of point,line and surface is constructed;When removing redundant data,a skip table address method is proposed to solve the hash conflict,improve the search performance of hash table,and speed up the removal of redundant data.At the same time,the distance similar vertices in the STL model are merged,and the appropriate position transformation is performed on the STL model.Secondly,based on the existing layering algorithm,considering the different performance and requirements of the model surface and interior of model,the idea of multi-layering is proposed,and the surface and interior of the model are processed separately.a multi-layering algorithm with equal layer thickness is designed.the shell and the skin use a smaller layer thickness,and the infill uses a larger layer thickness.At the same time,the specific process of the multi-layering algorithm with equal layer thickness is clarified,and the performance of the existing layering algorithm and the multi-layering algorithm with equal layer thickness is compared.Then,on the basis of the multi-layering algorithm with equal layer thickness,fully considering the influence of the surface curvature change of the model,and combined with the advantages of adaptive layering,a multi-layering algorithm with adaptive layer thickness based on top height method is proposed,the shell uses smaller different layer thickness according to the surface quality of the model,and the infill uses the maximum layer thickness.At the same time,the specific process of multi-layering with adaptive layer thickness is defined,and the performance of multi-layering algorithm with equal layer thickness and multi-layering algorithm with adaptive layer thickness is compared.Finally,combined with the multi-layering algorithm with equal layer thickness and multi-layering algorithm with adaptive layer thickness proposed in this thesis,the existing additive manufacturing software system is re-developed,the interface is redesigned.Taking the FDM process as an example,the simulated printing effect function of the model is displayed,and the feasibility of the proposed two layering algorithms is verified.