Journal
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
Volume 23, Issue -, Pages 78-90Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cirpj.2018.08.005
Keywords
Feedrate scheduling; Tracking errors; Contouring errors; Five-axis; CNC machining
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Funding
- National Sciences and Engineering Research Council of Canada CANRIMT2 Strategic Research Network Grant [NETGP 479639-15]
- National Natural Science Foundation of China (NSFC) [51505167, 51535004]
- International Postdoctoral Exchange Fellowship of China Postdoctoral Council
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This paper proposes a model to keep the cutting load induced tool tip position and tool orientation errors of five-axis CNC machines within the desired tolerance limit by scheduling the feed along the tool paths. The cutting forces at the tool tip are transmitted to three translational and two rotary servo drives of the machine tool using its kinematic model. Tracking errors of each axis contributed by cutting forces are modeled using the disturbance transfer function of servo drives. The tracking errors are mapped to the workpiece coordinate system to evaluate the tool tip position and tool axis orientation errors at discrete tool path locations. The cutting forces, therefore the tracking errors, are modeled as a linear function of tangential feed velocity. The feed is adjusted to constrain the tool tip position and tool axis orientation errors at the desired tolerance levels along the tool path. The proposed algorithm has been experimentally validated by milling a curved tool path on a five-axis commercial CNC machine tool. It is shown that the proposed algorithm can significantly improve the part machining accuracy without increasing the machining time. (C) 2018 CIRP.
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