Feed rate relaxation method for reducing multi-axis machining contour errors

Abstract

The invention provides a feed rate relaxation method for reducing multi-axis machining contour errors, and belongs to the field of numerical control machining. The method includes: firstly, segmenting a parameter interval of a given path according to a preset interval, and calculating a contour error in each segmented interval and a maximum feasible feed rate with a machine tool kinematical constraint; then fusing the segmented intervals with small amplitude fluctuation ranges of the feed rates, scanning maximum feasible feed rate sequences of all the segmented intervals from a parameter origin, and identifying feed rate sensitive regions and inflection point positions; moreover, correcting the maximum feasible feed rates at the inflection points by employing a bidirectional scanning algorithm; and finally, based on the maximum feasible feed rates, performing adaptive configuration on B-spline curve control points used for expressing the feed rate contour, and performing relaxation adjustment of the feed rate curve with the contour error and the machine tool multi-axis kinematical characteristic constraint. According to the method, the kinematical characteristics of numerical control machining can be effectively improved, and the geometric precision and the surface quality of numerical control machining are guaranteed.

Description

technical field [0001] The invention relates to a feed rate relaxation method for reducing multi-axis machining contour errors, and belongs to the technical field of numerical control machining. Background technique [0002] With the increasing requirements for equipment performance and working environment in fields such as energy and power, it is very important to further improve the machining accuracy and efficiency of mechanical parts, especially for some key complex curved surface parts, how to achieve high-quality and efficient machining has become a major issue in CNC One of the research hotspots in the processing field. As an important indicator for evaluating the precision of NC machining of parts, contour error has attracted widespread attention from scholars and industries at home and abroad. Focusing on the topic of reducing the contour error, the current research can be classified into the following three categories according to the different starting angles: Fi...

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Problems solved by technology

The relevant patent on the research on the feed rate planning method of NC machining, "off-line planning method of NC machining feed rate with jerk constraint", the patent number is 2014100130310, its core is to realize the adaptive customization of the feed rate based on the curve evolution technology, but No Contour Error Constraints Involved

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