The high-precision development of smtcl CNC machine tools

The requirements for precision of CNC machine tools are no longer limited to static geometric accuracy. The motion accuracy, thermal deformation, and monitoring and compensation of vibration of machine tools are increasingly valued.

(1) Improving the control accuracy of CNC systems: high-speed interpolation technology is adopted to achieve continuous feed with small program segments, making the CNC control unit more refined. High resolution position detection devices are also used to improve the position detection accuracy (Japan has developed an AC servo motor with a built-in position detector of 106 pulses/revolution, which can achieve a position detection accuracy of 0.01 μ m/pulse). The position servo system adopts methods such as feedforward control and nonlinear control;

(2) Adopting error compensation technology: using techniques such as reverse clearance compensation, screw pitch error compensation, and tool error compensation to comprehensively compensate for the thermal deformation error and spatial error of the equipment. The research results indicate that the application of comprehensive error compensation technology can reduce machining errors by 60% to 80%;

(3) By using grid inspection and improving the motion trajectory accuracy of the machining center, and predicting the machining accuracy of the machine tool through simulation, the positioning accuracy and repeatability accuracy of the machine tool can be ensured, and its performance can be stable for a long time. It can complete various machining tasks under different operating conditions and ensure the machining quality of parts.