Material removal algorithm based on STL model intersection loop
A model and algorithm technology, applied in the field of virtual CNC machining, can solve the problems of slow simulation speed, poor real-time performance, and low processing efficiency, and achieve the effect of simple calculation and reduction of processing errors.
Active Publication Date: 2017-01-11
TSINGHUA UNIV
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[0003] In view of the above problems, the object of the present invention is to provide a material removal algorithm based on the STL model intersection loop, which overcomes the problems of poor real-time performance, slow simulation speed, and low processing efficiency, and can effectively improve the processing simulation speed and accuracy.
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[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0014] Such as figure 1 As shown, the present invention provides a material removal algorithm based on STL model intersection loop in a kind of numerical control machining geometry simulation, and it comprises the following steps:
[0015] 1) Reconstruct the intersecting triangular facet pairs based on the intersection line ring of the workpiece and the swept body STL model of the tool:
[0016] Reconstruction is aimed at the triangular faces that participate in the processing on the workpiece and the swept body of the tool, that is, to reconstruct the triangular faces that are penetrated by the intersection line. The reconstruction method is based on the intersection of the triangular face pairs. The triangular face of the structure is divided into several new triangular faces;
[0017] 2) Classify the triangular faces: such as Figure 1 ~ Figure ...
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The invention relates to a material removal algorithm based on an STL model intersection loop. The material removal algorithm comprises the steps of triangular patches participating in intersection on processed workpieces and a tool scanning body are reconstructed based on the STL model intersection loop of the processed workpieces and the tool scanning body; according to the normal vectors of the triangular patches on the cutter surface, new triangular patches taking intersecting lines as edges on the processed workpieces are determined as retained surfaces or removed surfaces; according to the normal vectors of the triangular patches on the surfaces of the processed workpieces, new triangular patches taking intersecting lines as edges on the cutter scanning body are determined as surfaces participating in processing or surfaces without participating in processing; categories of other patches are quickly determined according to classified triangular patches; the material-removed workpiece model is formed by the sealed surfaces composed of the retained surfaces on the processed workpieces and the the surfaces participating in processing on the cutter scanning body. By the material removal algorithm, poor real-time capability, slow simulation rate and low processing efficiency are overcome and processing and simulation speed and precision are effectively increased.
Description
technical field [0001] The invention relates to the field of virtual numerical control machining, in particular to a material removal algorithm based on an STL model intersection loop in geometric simulation of numerical control machining. Background technique [0002] At present, the representative material removal methods widely used in China are as follows: 1. The solid geometric modeling method generates the tool scanning body by moving the tool along the machining track, and then directly subtracts the material on the blank body by using the Boolean difference operation. It is realized by removing the tool scanning volume. It directly uses mathematical methods such as parametric equations to describe geometry, and saves all geometric information, so its calculation results are accurate, and various geometric measurements and processing can be performed. Its shortcoming is that every step of the tool movement requires a large number of Boolean intersection operations, a...
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IPC IPC(8): G05B19/408
CPCG05B19/408
Inventor 关立文王立平戴玉喜
Owner TSINGHUA UNIV