A Modification of Geometric Error Model of Five-axis Machine Tools with the Consideration of Workpiece Coordinate System

Abstract

The five-axis machine tools have been increasingly used among all fields of manufacturing, and the research related to geometric errors is the most non-negligible subject of five-axis machining accuracy. According to the shape generation theory, the geometric error model is established through the D-H matrix of each geometric error to achieve the coordinate transformation. In this study, the authors propose a modification of the previous geometric error model, through the additional workpiece coordinate transformation. The simulation results of cubic-machining test show that it is necessary to consider the workpiece coordinate system to make the proper error reflection onto the simulated machining surface.