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一对在用的普通车床进行数控改造。应选择经济型数控系统,清华大学研制的GMT-CNC-02车床数控系统是车床改造的较佳选择:机床控制方式宜选择半闭环系统。二伺服系统的选用。纵向进给系统采用减速齿轮副带动丝杠运动:横向进给系统由伺服电机通过十字滑块联轴结直接驱动丝杠,驱动件为 SGMC 系列交流伺服电机。滚珠丝杠及交流伺服电机设计计算详见论文。三在机床机械结构改造中①主传动通过加装变频器实现无级变速,并在车床主轴后端加装光电脉冲编码器使机床具有车削螺纹的功能。②进给传动系统改造后,纵向进给系统传动链为:交流伺服电机——齿轮减速箱——滚珠丝杠——大拖板:横向进给系统传动链为交流伺服电机——滚珠丝杠副——中拖板。机床部件安装调整时,应采取工艺措施保证其位置精度。③对改造后的机床应进行直线运动定位精度和重复定位精度的检验,同时要进行空载、负载的调试及加工精度检验。
A pair of ordinary lathes used in CNC transformation. Should choose economic CNC system, developed by Tsinghua University GMT-CNC-02 lathe CNC system is a better choice for lathe transformation: Machine control method should choose semi-closed-loop system. Two servo system selection. Longitudinal feed system adopts reduction gear pair to drive the screw movement: The horizontal feed system is driven by the servo motor directly through the cross slide block coupling, the drive is SGMC series AC servo motor. Ball screw and AC servo motor design calculations see the paper. Third, in the machine structural transformation ① The main drive through the installation of frequency converter to achieve stepless speed change, and in the lathe spindle optical pulse encoder installed to make the machine has a turning thread function. ② After the transformation of the feed drive system, the vertical feed system transmission chain is: AC servo motor - gear reducer - ball screw - large carriage: horizontal feed system for the AC servo motor drive chain - ball screw Vice - in the carriage. Machine tool installation and adjustment, should take technical measures to ensure its position accuracy. ③ After the transformation of the machine should be linear motion positioning accuracy and repeat positioning accuracy test, at the same time to carry out no-load, load testing and machining accuracy testing.