الفهرس | Only 14 pages are availabe for public view |
Abstract One of the important trends in precision machining is the development of geometric error identification and compensation techniques. The study provides a complete cost-wise flexible geometric error- compensation technique which is suitable for various CNC machine tools and more convenient for traditional/old CNC machine tools that .4 are more exposed to permanent geometric errors that may make them out of work. While the main contributing error of the machine’s inaccuracy is the linear positioning errors of the axes. The study aims to identify translational positional errors of the axes without the need to in- . process sensing or laser measurements such as Laser Interferometer or Double Ball-Bar (DBB) systems that need very time consuming and complexity for accomplishment of geometric error modelling process of CNC machine tools. The estimation of positional errors is based on an assessment of the target CNC machine tool by sequence of measuring and checking of cutting tests that were carried out by this machine. Measurement process was performed by precision co-ordinate measuring machine (CMM) to determine a travel error in each axis. The analysis of measurement results be used to model error sources by applying linear regression and artificial neural networks (ANN), thus implementation of an adaptive error compensation which is performed by editing the part program (O-Code). 11 |