Tool-path Optimization Research Of Fused Deposition Modeling

With the encouragement and support of rapid prototyping technology in the national policy measures made,many domestic research institutes invested a lot of manpower and capital in rapid prototyping technology in China.3D printing technology has also made great progress and made great changes in automobile manufacturing,aerospace,food processing,Nano manufacturing,industrial equipment,medical and military fields.Transformation of traditional manufacturing industry in China cannot do without the strategic technology 3D rapid prototyping technology,but 3D printing technology in China t is still a certain gap compared with foreign advanced level,the import price of 3D printers is high relatively,and there are many restrictions on the use of conditions,how to generate their own sophisticated printer is the problem that we need to face.How to deal with model related data effectively and ensure the accuracy and intensity of printing models is the fundamental problem to improve the efficiency of printing manufacturing.In this paper,the purpose is to optimize the filling path of fused deposition modeling area.The goal of optimization is to shorten the filling time and improve the filling efficiency of fused deposition modeling.First of all,the factors that affect the forming accuracy of fused deposition modeling process are analyzed,and the fitting method is adopted to reduce the errors in the process of filling.In this paper,we use the combination method of contour offset method and solid Zigzag scan filling.After dividing the section outline,we get the best scanning angle in every subregion.First,the model STL files are analyzed and collated to get the required points,lines,surfaces and other related information,so as to extract the polygonal contour of the cross section.The curve part of the polygon contour is fitted by NURBS curve,thus the contour curve of the original model is approximated.Next,the filling path of contour within the first use of the existing segmentation algorithms and the holes of the contour into two or more separate regions,the concave convex decomposition of the deformation algorithm for each individual region is divided into several sub regions,the algorithm is to reduce the number of nozzle holes and across non forming region.so,there is only empty stroke from one area to another in the sub region.In the kinematic model,through the study of the filling angle in the filling process of molten deposition molding technology,it is found that the optimum filling angle exists in different regions.The use of different filling angles in each subregion can effectively reduce the filling time and reduce the internal stress in the filling process.Finally,the validity and correctness of the optimized method are verified by an example,it is great significance to ensure the accuracy of the model and improve the efficiency of the molding.