Research On Hierarchical Algorithm And Path Planning In 3D Printing Of Denture

In recent years,due to the unique advantages of the 3D printing technology,such as short production cycle and high degree of personalization,compared to the traditional reduced-material manufacturing process,the development is very rapid and has been widely used in many areas,such as industrial manufacturing,building materials,aerospace and other fields,its application in the medical field is also a hot topic of research in recent years.The use of materials stacked layer by layer to manufacture the denture model not only greatly shortens the production cycle,but also improves the molding accuracy to a certain degree.Therefore,the 3D printing of the denture model has certain research value.The topic aims at the 3D printing processing denture model,based on Fused Deposition Modeling(FDM)processing technology,and the 3D printing of denture models is studied from the aspects of improve the forming precision,strength and processing efficiency of denture model,the two aspects of 3D printing data processing and motion control system are studied and improved in depth.This paper first reads the STL files of the denture model,and removes a large number of redundant data in the file,and establishes the data structure of the point table to store and visualize the model.Then the hierarchical algorithm is developed,and the thickness of printing layer is calculated theoretically,and the denture models are classified according to the shape and size of the denture models.According to different classification,different hierarchical strategies are adopted to make the main error of the model is the redundant error,which meets the requirements of subsequent processing technology.The thickness of the slice is determined by the ratio between the normal vector and the difference of the closed loop contour length on the two adjacent layers,which improve the printing efficiency and improve the manufacturing accuracy of the denture model.After stratification is completed,the internal scanning path is planned,in order to reduce the internal stress of the denture after molding and increase the mechanical strength after molding,the contour migration path planning algorithm is adopted,at the same time,the problems in the algorithm are analyzed and improved,and the extracted contour and filling path points are converted to Gcode code.Finally,the software control program is written to read the Gcodecode,according to the characteristics of the path segment,a perfect motion control strategy is proposed,which is foresight,acceleration and deceleration and interpolation,the experimental platform was used to print and test the denture model.The experimental results show that the printing effect is good.