Trajectory optimization method for procession of mould pneumatic grinding wheel based on three-dimensional boundary extraction

Abstract

The invention discloses a trajectory optimization method for the procession of a mould pneumatic grinding wheel based on a three-dimensional boundary extraction. The trajectory optimization method comprises the following steps: (1) modeling, and storing a CLSF (Cutter Location Source File) file of a trajectory planning and a VRML (Virtual Reality Markup Language) file of a model; (2) reading the VRML file, adopting a regular expression to identify text data, and then storing the data into an array; (3) setting 'normal vector mutation threshold value' by a user, wherein the value is obtained according to a maximum curvature on 3D model (three-dimensional model), the curvature is larger, the threshold value is larger; (4) taking vector modules after normal vectors in a unit normal vector group are conducted for the pairwise difference, comparing the vector module with a threshold and deleting diagonal lines and repeated boundary lines according to the comparison results; (5) setting the rest of line segments to obtain a boundary line array; and (6) calculating the distance between the center of a contact surface of any processing point and every boundary on a trajectory plan, and carrying out posture optimization on relative positions of the boundary lines and the processing points. According to the method, the problem of boundary in a pneumatic grinding wheel procession process path can be considered, and the effect is significant.

Description

technical field [0001] The invention relates to the field of computer graphics, and relates to a method for extracting boundary lines of three-dimensional models based on VRML technology. Background technique [0002] At present, the research on the boundary line extraction of 3D models mainly includes the following two aspects: (1) From the perspective of the two-dimensional image, some image processing methods are used to extract the boundary line, and the extraction result is another picture. Obviously, this method cannot contain The analytical formula of each boundary line in three dimensions; (2) Starting from the real object, the point cloud is obtained by scanning or measuring, and then the points belonging to the boundary line are obtained through a search algorithm, and finally the reverse modeling is performed on the computer. The second method can obtain the analytical expression of the boundary line in 3D, can handle dense point cloud data, and is generally used ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the model boundary line data cannot be obtained directly from the 3D modeling software, the present invention starts from the 3D model and provides a method for extracting the boundary line of the 3D model based on VRML technology. This method has a wide range of applications and can handle arbitrary complex shapes. 3D model of appearance

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