RELOCATION OF TOOL TIP POSITION BASED ON STATIC AND DYNAMIC MEASUREMENT OF THREE AXES MACHINE TOOLS

摘要

Manufacturers are forced to improve their product quality while maintaining high productivity. To maintain product quality, it is necessary to know the accuracy of machine tools so that the defective parts could be prevented from manufacturing. Angular and positioning errors are quite common problems in machine tools in manufacturing industries. The origins of these errors are kinematic parameter deviations resulting from manufacturing errors, assembly errors or quasistatic errors. By static (like laser interferometer, linear comparator, etc.) and dynamic measurements (double ball bar; DBB) we get different kinds of error origin information of the machine tools. However we are able to convert the results of static measurements to match the results of dynamic measurements and vice versa. This study shows a mapping between static and dynamic measurements of machine tools with an error compensation scheme by post processing CL-data file. For static measurement a laser interferometer and a linear comparator measuring system were used and for dynamics measurement a DBB was used in this study. The theoretical trace for DBB was obtained based on roll, pitch, yaw and positioning errors found by laser measurement. This trace was compared and simulated with the trace obtained by DBB and direct cutting method of machine tool under inspection.