A method for over-quadrant friction compensation in the process of CNC machine tool axis linkage processing

Abstract

The invention relates to a method of over-quadrant friction compensation during the axis linkage machining process of a numerical control machine tool. The method includes the steps: performing sampling on the axis linkage machining data of the numerical control machine tool, acquiring the error sequence of each machining axis, according to the error sequence, determining the area requiring compensation, determining the compensation starting point, the compensation maximum value point and the compensation terminal point, converting the linkage error into the following error of single axis through calculation, segmenting the area requiring compensation in the following error sequence, constructing a compensation sequence for the following error sequence, correspondingly inserting the compensation sequence in the area requiring compensation, of the machining axis influenced by the frictional force, compensating the machining axis influenced by the frictional force, and correcting the error. The method of over-quadrant friction compensation during the axis linkage machining process of a numerical control machine tool can effectively overcome the problem that the over quadrant point has sharp trace, is lower in cost, can perform sampling on different machine tools and make adaptive processing, and can flexibly perform distinctive processing on movement at different radius of curvature and speed to realize preferable error compensation effect.

Description

technical field [0001] The invention relates to the field of numerical control processing software, in particular to the field of multi-axis linkage numerical control machining, and specifically refers to a method for over-quadrant friction compensation in the shaft linkage machining process of a numerical control machine tool. Background technique [0002] The CNC machine tool will be affected by friction during the operation process. During the arc machining process, the speed of the two processing axes at the quadrant point does not match. Generally, the speed of one axis is fast, and the speed of the other axis starts from zero or reverses. Axes with zero or reversed speeds need to overcome friction, thus causing hysteresis and causing arc crossing problems. The final performance of crossing the quadrant is that sharp marks appear at the crossing quadrant during processing such as plane arcs. The appearance of sharp marks is obviously the effect of the linkage of two ax...

AI Technical Summary

Problems solved by technology

The appearance of sharp marks is obviously the effect of the linkage of two axes (or multiple axes), and now the compensation method is mostly done on the servo end, which is generally called friction compensation, but often the servo end compensation is performed on a single axis, and There is no correlation for the velocity and radius dependent quantities of the arc

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