Accuracy enhancement of five-axis CNC machines through real-time error compensation |
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| Authors: | W T Lei Y Y Hsu |
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| Affiliation: | a Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan, ROC;b Department of Mechanical Engineering, Chung Hua University, Hsinchu, Taiwan, ROC |
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| Abstract: | Although error modeling and compensation have given significant results for three-axis CNC machine tools, a few barriers have prevented this promising technique from being applied in five-axis CNC machine tools. One crucial barrier is the difficulty of measuring or identifying link errors in the rotary block of five-axis CNC machine tools. The error model is thus not fully known. To overcome this, the 3D probe-ball and spherical test method are successfully developed to measure and estimate these unknown link errors. Based on the identified error model, real-time error compensation methods for the five-axis CNC machine tool are investigated. The proposed model-based error compensation method is simple enough to implement in real time. Problems associated with the error compensation in singular position of the five-axis machine tool are also discussed. Experimental results show that the overall position accuracy of the five-axis CNC machine tool can be improved dramatically. |
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| Keywords: | Accuracy enhancement Five-axis machine tool Probe-ball Error compensation |
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