As the control center of the transfer machine, the CNC system is known as the "brain" of the machine tool. The transfer machine equipped with the CNC system greatly improves the precision, speed and efficiency of the parts processing. With the rapid development of automobile, national defense, aviation, aerospace and other industries and the application of new materials such as aluminum alloy, the high-speed processing of transfer machine is becoming more and more demanding. The accuracy requirements of transfer machine are now not limited to static geometric accuracy, and the motion accuracy of machine tools, thermal deformation, and the monitoring and compensation of vibration have been paid more and more attention.
(1) Improve the control accuracy of the CNC system: high-speed interpolation technology is used to achieve continuous feed with tiny program segments, so that the CNC control unit is refined, and high-resolution position detection devices are used to improve the position detection accuracy, and the position servo system adopts feedforward control and nonlinear control methods;
(2) The use of error compensation technology: the use of reverse clearance compensation, screw pitch error compensation and tool error compensation technology, the thermal deformation error and space error of the equipment comprehensive compensation. The results show that the application of comprehensive error compensation technology can reduce the machining error by 60% ~ 80%.
(3) Using the grid to check and improve the accuracy of the machining center's motion trajectory, and predict the machining accuracy of the machine tool through simulation to ensure the positioning accuracy and repeated positioning accuracy of the machine tool, so that its performance is long-term stable, can complete a variety of processing tasks under different operating conditions, and ensure the processing quality of parts.
With the increasingly strict environmental and resource constraints, the greening of manufacturing and processing is becoming more and more important, and China's resource and environmental problems are particularly prominent. Therefore, in recent years, without or less use of coolant, to achieve dry cutting, semi-dry cutting energy saving and environmental protection machine tools continue to appear, and in continuous development. In the 21st century, the general trend of green manufacturing will accelerate the development of various energy-saving and environmentally friendly machine tools and occupy more world markets.
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