Tiny line segment cutter path C2 continuous compression smoothing method

Abstract

The invention relates to an offline system in the technical field of numerical control machining. The objective of the invention is to fade a micro line segment into a B spline curve by fitting the micro line segment instead of switching. According to the technical scheme, the small line segment cutter path C2 continuous compression smoothing method comprises a data compression module and a path smoothing module; the data compression module is used for extracting micro line segment coordinates in the code by reading G01 segment information in the G code, detecting the micro line segment coordinates according to a double-bow-height error detection method to obtain reasonable feature point distribution, and realizing data compression of an approximation curve through least square fitting; and the path smoothing module is used for calculating approximation errors of the polygonal edges of the path one by one through the approximation error model of the polygonal edges, taking points fromthe corresponding edges which do not meet the approximation precision, taking the shortest normal distance from the taken points to the approximation curve as a new constraint, and adding the new constraint into the global tool path optimization model to realize path smoothing.

Description

technical field [0001] The present invention relates to an off-line system in the technical field of numerical control processing, especially a small line segment tool path C 2 Continuous compression smoothing method; specifically, scan tiny line segments (G01 code) according to the double-bow height error detection method to generate a small number of control points, and generate a B-spline curve with a small energy value according to the approximation error model and the path optimization model. Background technique [0002] Although the local smoothing method of the small line segment tool path has a series of advantages such as simple implementation and small amount of calculation, this local smoothing method will generate a transition curve at each corner, and the more segments of the small line segment, the generated The more transfer curves there are. For small line segment tool paths, this not only tests the storage capacity of the CNC system, but also tests the for...

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Problems solved by technology

[0004] Retrieval to the prior art finds that useful B-spline curves are used to compress and smooth small line segments (CN104007705B). However, due to the fact that the feature point selection method adopted does not fully consider the geometric characteristics of the path, the data of the approximation curve is not effectively compressed; The Hausdorff method detects the approximation accuracy of the curve, but does not clarify how to reduce the approximation error when the approximation accuracy does not meet the accuracy requirements

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