Improving machining accuracy by automatic compensation based on the off line measurement
The inaccuracy of CNC machining may come from several factors, such as machine vibration, dynamic stiffness, and thermal expansion. Once a workpiece is machined inaccurately, we can modify the NC program to generate compensation tool paths, and then perform the finishing process. However, the modification of the NC code is time consuming, and the results may not be satisfactory as well. We propose a method in the paper to improve the machining accuracy by automatically modifying the NC program for compensation based on the data obtained from an off line measurement. Then the workpiece could be finished along the tool paths to compensate the errors caused by the CNC machine. A case study showed that the machining accuracy of a workpiece could be enhanced by using this compensation method.
2017 IEEE International Conference on Consumer Electronics Taiwan (ICCE TW)