Optimization method of precession machining trajectory of mold pneumatic grinding wheel based on 3D 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 fields of computer graphics and robot control, and is a method for optimizing the precession processing trajectory of a mold pneumatic grinding wheel based on three-dimensional boundary extraction. Background technique [0002] Polishing is an important process in mold manufacturing. The use of pneumatic grinding wheel finishing technology can effectively improve the processing quality of mold free-form surfaces. Precession polishing is an important processing method for pneumatic grinding wheel skinning. This method can not only change the direction of cutting speed, but also its removal function approximates a Gaussian distribution, which is beneficial to the calculation of dwell time. However, through theoretical analysis and experimental observations, it is found that during the finishing process of the pneumatic grinding wheel, the precession machining method is only suitable for the interior of the continuous curved s...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the model boundary line data cannot be directly obtained from the 3D modeling software, the present invention triggers from the 3D model and provides a method for optimizing the precession processing trajectory of the mold pneumatic grinding wheel based on the extraction of the 3D boundary. This method has a wide range of applications and can Handle 3D models with complex shapes arbitrarily

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