A Divide and Conquer Processing Method for Triangular Mesh Model

Abstract

The invention provides a partition machining method of a triangular mesh model, and belongs to the technical field of CAM. The partition machining method of the triangular mesh model is characterized in that the partition machining method includes the steps that neighborhood points within an R radius range are selected so as to calculate differential geometry information of a triangular patch model accurately; the triangular patch model is segmented into sub-regions with different characteristics with characteristic statements of sub-regions to be machined as growth principles, optimization merging is conducted on small-area regions and wrongly judged regions so as to eliminate over-segmentation phenomena, and boundary smoothing is conducted on the sub-regions so as to reduce saw-toothed boundaries; different track strategies are adopted in different types of the sub-regions to be machined, when a constant scallop height track is generated, the circular cutting initial track generation method is adopted in the convex sub-regions and the concave sub-regions, the linear cutting initial track generation method is adopted in the saddle-shaped sub-regions, machining is conducted on tracks at the positions of sub-region boundaries when bias extension is conducted on cutter track projection, and reasonable and complete sub-region machining tracks are obtained. According to the partition machining method, numerical control machining cutter tracks giving consideration to the machining efficiency and the machining quality are effectively generated from the complicated triangular patch model.

Description

technical field [0001] The invention relates to the technical field of CAM, in particular to a method for dividing and conquering a triangular mesh model. Background technique [0002] With the development of technologies such as reverse engineering, rapid prototyping, and computer-aided design, the triangular mesh model has been widely used in the past ten years, and its related trajectory planning research and mesh segmentation research have also become research hotspots. Directly generating tool paths from the triangular mesh model can avoid the loss of accuracy in the surface reconstruction process, and can also eliminate the cost and material limitations of metal parts processed by 3D printing methods. So far, there are relatively many studies on tool path planning for three-axis NC machining based on parametric surface models; while there are few studies on tool path planning for NC machining based on mesh models, and the existing research basically regards the entire ...

AI Technical Summary

Problems solved by technology

However, the current research on the equal residual height method mainly focuses on the tool trajectory offset generation method based on the overall model, which uses the model boundary as the initial trajectory, which cannot solve the problem of trajectory generation of different types of sub-models in divide-and-conquer machining.

[0004] To sum up, there is no mature method to effectively realize the divide-and-conquer processing of triangular mesh models, and the existing triangular mesh model segmentation methods, trajectory generation methods and other related technologies cannot be directly or effectively applied to realize triangular mesh processing. Lattice Model Divide and Conquer

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