Geometric Error Modeling and Compensation of a Multi-spindle Reconfigurable Machine Tool

摘要

This paper presents the challenges in volumetric error compensation for reconfigurable machine tools with simultaneously-operating multiple cutting tools. Due to axis sharing, the geometric errors of multi-spindle cutting processes exhibit significant coupling of error components. As a result, it is not possible to achieve exact volumetric error compensation for all axes. The paper presents a method to determine compensation amount using weighted least squares to minimize the overall volumetric error in simultaneous cutting. Proposed approach also allows tolerance distribution of machining accuracy for different workpiece surfaces. The simulation results demonstrate effectiveness of the proposed error compensation algorithm.