Abstract
The paper introduces the structure, features and functions for the CNC system of the YK3480 gear hobbing-machine and YKA7232 worm wheel gear grinding-machine, as well as some of the key techniques. The system can run with 5-coordination controls and 4-coordinated motions. In order to ensure the static accuracy and dynamic performance, a fuzzy rough-accurate regulating combined control strategy for the high-speed and high-accuracy position servo system is presented. A forward control network is also introduced for reducing corner rounding errors. Practical results show that by using the closed-loop fuzzy control the resolution and accuracy achieved by the servo system were equal to those of the measuring devices, and the system operated stably and no runaway occurred.
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