Triangle Bezier curved surface numerical-control finishing tool-path quick generation method

Abstract

The invention provides a triangle Bezier curved surface numerical-control finishing tool-path quick generation method which is characterized by comprising the following steps: introducing the topological neighbor relation of the triangle Bezier patch in the dynamic index organization; on the basis of the index, quickly acquiring a triangle Bezier patch set which is intersected with the cross section of the tool path; carrying out initial intersection point iterative computation on any intersecting patch; tracking the intersection from the initial intersection point to obtain integral intersecting lines crossing the Bezier patches; using the end points of the obtained orderly intersecting lines as the tool contact points to obtain the corresponding tool position points, and carrying out interference point treatment; and orderly connecting the tool position points to generate a numerical-control finishing tool path. The cases prove that the method can be used for accurately and quickly generating a numerical-control finishing tool path for ball tools for any complex triangle Bezier curved surface.

Description

technical field [0001] The invention provides a method for quickly generating a triangular Bézier curved surface CNC finishing tool track, which belongs to the field of computer-aided manufacturing. Background technique [0002] In product reverse engineering, the triangular Bézier surface can be effectively used to solve the problem of fast and accurate surface reconstruction of complex point cloud data due to its advantages of flexible configuration and good boundary adaptability. At present, the digital model of the product represented by the triangular Bézier surface cannot be compatible with the mainstream CAD / CAM system, and it is difficult to perform CNC machining. It is of great significance to study the generation method of NC toolpath on triangular Bézier surface and directly generate NC toolpath through triangular Bézier surface to improve product development efficiency and manufacturing accuracy in reverse engineering. [0003] Retrieval of existing technical li...

AI Technical Summary

Problems solved by technology

[0003] Retrieval of existing technical literature found that in the paper "Intersection and Application of Composite Triangular Bezier Surfaces and Planes" published in the academic journal "Automotive Engineering" 2000, 22(2), P120-124, based on the knife The rail section plane method realizes the cutting tool rail on the triangular Bézier surface. The efficiency and accuracy of the tool path generation mainly depend on the intersection efficiency and the calculation accuracy of the intersection line between the curved surface and the tool rail section plane. When generating the finishing line cutting tool rail, the boundary point The calculation is cumbersome and unstable, and the tool path generation efficiency is low

Images