Grid patch retrieval method for curved surface part measurement points based on vector cross multiplication

Abstract

The invention discloses a grid patch retrieval method for curved surface part measurement points based on vector cross multiplication. The method comprises the following steps: A, acquiring patch data of each grid patch in an STL file; B, determining a plurality of advancing starting points and a plurality of sections of advancing paths of the selected grid patches; C, carrying out vector cross product operation on a connecting line vector of the current advancing starting point and the measuring point and a vector of the current advancing path, carrying out point multiplication on a vector cross product operation result and a patch normal vector, and obtaining a position relation between the measuring point and the advancing path according to a point multiplication result; D, judging whether the selected grid surface patch is the grid surface patch corresponding to the measurement point, if so, entering the step E, and if not, re-selecting a new grid surface patch and returning to the step B; and E, obtaining the normal vector direction of the grid surface patch to drive the measuring head to move. According to the invention, direct data processing operation of the STL file corresponding to the triangular mesh model is realized, the normal vector direction of the model contour corresponding to the measuring point is rapidly obtained, and the measuring head for precision detection is effectively driven to move.

Description

technical field [0001] The invention relates to the precision technology field of curved surface parts, in particular to a vector cross product-oriented grid patch retrieval method for measuring points of curved surface parts. Background technique [0002] In the production process of complex curved surface parts, it is necessary to use corresponding detection technology to detect and control its machining accuracy. Among them, the detection technology based on three-coordinate measuring machine (CMM) is often used in the shape and position accuracy detection of precision parts. At present, the 3D data of parts with complex curved surfaces is often stored as a parametric model in the computer, and any shape data information in it is accurately recorded through digital information such as shape features or parametric surfaces. By retrieving the recorded digital information, the normal vector direction of the part shape corresponding to the measurement point is directly obtai...

AI Technical Summary

Problems solved by technology

Among them, the direction information of the patch normal vector can be directly obtained according to the stored data of the STL file, but there is no direct method for the retrieval operation of the grid patch corresponding to the measurement point

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