Research And Application Of Slice Algorithm In 3D Printing

After entering the 21st century, 3D printing technology, as a new and comprehensive manufacturing technology which combines multiple disciplines,attracts more and more attention. 3D printing technology has been widely used in many fields because of its low cost, low threshold, high forming speed and other advantages. The slice algorithm plays an important role in 3D printing technology,which not only affects the efficiency of printing, but also affects the accuracy of the printed product. In this paper, we studied the existing problems of slice algorithm, and then improved the speed of and the algorithm and precision of slicing model.Afterwards, we could apply the contour polygon generated by slicing algorithm into the 3D modeling field.It is necessary to read the 3D model data stored in the computer while slicing the common file formats includes STL files, PLY files, AMF files and so on, among which STL file format, as the common file standard of a rapid prototyping manufacturing field, is the mainstream direction of research nowadays. The STL file stores the 3D model data in the form of a triangular patch. The scrambling and disordered data lead to the slowness of reading and searching relevant data during the slicing process. The topology of the reconstructed data can increase the search speed.Existing topology reconstruction algorithms such as improved direct algorithms,half-edge merging algorithms, etc., mostly speed up data search through adding different data or storage structures, such as half-structure, binary tree and balanced binary tree structure. However, its speed will largely reduce when dealing with large amounts of data. According to the structure and composition characteristics of the three-dimensional model data itself, the relationship between midpoints, and the line and the surface of each triangular face, comparing the advantages and disadvantages of each data structure, we use the structure, which is relatively simple, to build a faster half of the structure as a topology reconstruction of the infrastructure, and the hash table as an additional storage structure to improve the read and take rate of the data .The most existing three-dimensional slice slicing algorithm, based on the point cloud structure and the location information triangulation algorithm, such as the slice algorithm do not take into account the fact of complexity of the model on the thickness of the slice, the choice is fixed slice thickness, resulting in the model of the"step effect", the impact of three-dimensional print forming results, resulting in model accuracy is not high. In this paper, we propose an improved adaptive segmentation algorithm to slice the three-dimensional model by combining with the structure of topology reconstruction in STL file format. The grouping is based on the height of the three-dimensional model and the tangent plane tangent direction. The information is grouped for all the relevant triangular patches. The higher the height, the more groups are created. In order to choose a different slice thickness,the adaptive slice utilize the height of the model and the number of triangles in the group to determine the complexity of the model. Meanwhile, the polygon of the slice is optimized by the minimum vertex area deletion algorithm,and the redundant vertex is deleted. In order to reduce the mechanical path, we use the Hermite spline and B-like to simplify the polygon after the sample processing, make the polygon boundary smooth, and then make it more suitable for 3D printing by the appropriate vertex discretization,.Finally, a new technique is proposed to construct the 3D model based on the slice contour polygon as the modeling foundation and the original model information attached to the contour polygon. We use the method of constructing the three-dimensional environment, the inter-layer construction, and the model closure to shorten the product development cycle by.