Research And Implementation Of Adaptive Slicing Technology In Additive Manufacturing Of Special-shaped Parts

In recent years,with the advancement of science and technology,additive manufacturing has become a very important manufacturing technology.The technology involves a relatively wide range,such as biology,aerospace and construction.The improvement of additive manufacturing is not only dependent on the development of equipment,but also the development of efficient slicing software to assist the rapid growth of additive manufacturing.With the promotion of additive manufacturing in different fields,the parts produced have become more complicated,and the requirements for manufacturing accuracy and forming speed are becoming higher and higher.The traditional equal-thickness layering improves the accuracy while reducing the forming speed and increasing the forming speed.The post-accuracy will be better again,and the adaptive layering just makes both.Therefore,the research on adaptive layering technology has become a hot spot in additive manufacturing.In this paper,the STL file is used as an intermediate file for data exchange of additive manufacturing.The characteristics of its storage model information and the two storage formats of ASCII code and binary are analyzed in detail.The characteristics of the two formats are compared,and the STL file in binary format is finally adopted.The STL file is to fit the surface of the three-dimensional model through the triangular patch.When storing the vertices of the triangular patch,you need to follow the right-hand rule,the common point rule and the common edge rule,so there will be a lot of storage in the vertex storage Redundant information,so removing redundant information when reading STL files can effectively improve the layering efficiency of the software.Adopt C# language,use CSharpGL graphic development tool to visualize STL model and commonly used coordinate conversion operation.The pre-processed STL file is subjected to equal-thickness layering,adaptive layering based on the ratio of contour area,adaptive layering with limited cutting depth value,adaptive layering to preserve model contours and self-adaptation to preserve model features The five layering methods of layering,and then reasoning and analyzing the basic principles and implementation processes of the five layering methods,and then layering 8 models of different complexity levels,comparing the execution time of the algorithm,the number of layers and the points Volume error after layering.Through the analysis of the icon of the data,it can be concluded that under different complexity models,the adaptive layering of the contour area ratio has good accuracy when the number of layers is obtained;when the model is more complex,the model is retained Feature adaptation can get the best accuracy;the model with the outer contour line of the model perpendicular to the XOY plane can use the maximum equal thickness layering to speed up the accuracy of additive manufacturing.Finally,the basic filling algorithm of the layered contour surface is studied,and the advantages and disadvantages of the scanning line filling algorithm,contour offset filling algorithm and composite filling algorithm are compared.Finally,a composite filling algorithm combining the advantages of scanning line filling and contour offset filling algorithm is selected.