Accurate Trajectory Control for Five-Axis Tool-Path Planning

摘要

Computer-Aided Manufacturing technology has been widely used for three-axis CNC machining in industry for many years. However, there still have some problems on five-axis machining applications. The major problems are overcut, interference, and trajectory error due to coordinated rotating and translating motions. Therefore, to develop more accurate and efficient five-axis tool-path planning is an important need for CNC machining industry. This research proposes a new method to produce accurate tool paths and orientations for 5-axis machining. The research approach begins with the analysis of the contour error due to the combinational motion of rotation and translation. The tool path feed step and tool orientation can be controlled accurately according to the determined trajectory error. Taking a part for example, the result shows that the trajectory contour error is improved about 5 times, from 0.153 mm to 0.031 mm, by using conventional method and our proposed approach, respectively. The new method improves not only the max. contour error, but part surface smoothness.