Complex cavity first-cutting and second-girdling track generation method based on partition planning

Abstract

The invention belongs to the technical field of machining CAD / CAM (computer-aided design / computer-aided manufacturing) and particularly relates to a partition planning-based method for generating a track of cutting before girdling of a complex cavity. The method comprises the following steps of S1, in view of the idea of a Voronoi diagram theory, carrying out partition planning on a complex cavity; S2, carrying out contour bias on the sub-rings subjected to partition planning, and providing a hybrid bias method; S3, interference judgment and elimination being performed on the offset ring, a correction offset method based on an angular bisector line segment being proposed to eliminate local interference, and global interference being eliminated by adopting an offset ring rotation criterion; and S4, generating a first-cutting and second-girdling processing track in the initial offset ring area without interference sealing. By means of the method, the machining track of first cutting and then girdling can be generated for a complex cavity, elimination of mutual interference is avoided through partition planning, complexity and the calculation amount of an algorithm are reduced, the cutter lifting frequency can be reduced, programming efficiency and the machining quality can be improved, and back gouging treatment can be carried out at a time after first cutting and then girdling.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing CAD / CAM, and in particular relates to a method for generating a trajectory of cutting first and then cutting circularly of a complex cavity based on partition planning. Background technique [0002] The processing methods of cavity parts have been developed for a long time, and a variety of processing methods have appeared so far. According to different processing conditions, there are processing methods such as line cutting, ring cutting, helical milling, and trochoidal milling. Due to the uncertainty and complexity of the cavity boundary, the method of judging and eliminating the equidistant offset and island interference without self-intersection of the boundary contour has always been a hot topic of research by scholars. The commonly used contour isometric methods are: direct isometric method, paired offset method, and Voronoi diagram method. The direct equidistance method conne...

AI Technical Summary

Problems solved by technology

With the upgrading and development of the manufacturing industry, there is an increasing demand for processing complex cavity parts with multiple islands, such as aerospace integral cabin parts, etc., but the current boundary contour has no self-intersecting equidistant offset and island interference The judgment and elimination method of the method is applied to complex cavities, and there are problems of large amount of calculation and inapplicability. Therefore, it is of great significance and necessary to propose a method that can efficiently and accurately generate machining trajectories for complex cavities.

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