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针对罗马尼亚ＳＣ１２５大型数控立车主轴定位分度系统问题，提出了用西门子ＣＮＣ交流伺服进给系统进行改造的方案，并进行了有关硬件和软件设计，完成了主轴分度定位控制的高性能数控机床的改造，使该立车具有七种工作模式，实现了车削与铣削为一体的两种控制方式，通过误差补偿达到了较高定位精度。完成了电气驱动系统的改造。
Aiming at the problem of spindle positioning indexing system of SC125 large CNC vertical lathe in Romania, a scheme of transformation with Siemens CNC servo servo system was put forward and the hardware and software design was completed. The high performance CNC machine tool with spindle indexing and positioning control Of the transformation, so that the car has seven operating modes, turning and milling as one of the two control methods, through the error compensation to achieve a high positioning accuracy. Completed the transformation of the electric drive system.