Application of ball bar system and genetic algorithms for CNC lathe contouring compensation

摘要

There is considerable interest in the development and improvement of contouring test devices for CNC machines. When ball bar systems are employed to test CNC lathes, the eccentricity cannot be determined accurately from the sampled quadrant contouring data via the least-squares method. Geometric errors, such as squareness and deformation errors, are underestimated, causing significant errors in eccentricity values. Thus, one device with one method is suggested herein for improved lathe compensation for a given radius. Further, it is found that by adjusting a lathe during initial setting-up, for the eccentricity determined via the proposed methodology, the real geometric error of the turned part can be significantly reduced. Thus, it is very important to obtain the correct eccentricity and minimum zone solution. In this paper, genetic algorithms (GAs) are employed to solve the minimum zone solution. Simulated data and analysed results prove that the proposed method is superior to the least-squares method.