Research on Technology of Variable Spindle Speed Noncircular Turning

To improve the stability and precision of noncircular manufacture process, the variable spindle speed turning is applied to noncircular turning process. The variable spindle turning system is designed. The character of variable spindle speed is analyzed. The linear servo unit available for variable speed noncircular turning process is designed. An active disturbance rejection control technique is applied to servo unit. The experiment results show that surface quality and tracking error of variable spindle speed noncircular turning are better than constant speed machining. The linear servo unit is able to track the desired trajectory of cutting tool motion.

Study on Technology of Noncircular NC Turning Based on Active Disturbance Rejection Control

In this paper, new technology of noncircular turning was presented, a voice coil motor-driven fasting tool servo system was established. A dual stage actuator mechanism was designed for the variable rake angle tool in noncircular turning process. The kinematics of mechanism was analyzed. An active disturbance rejection control technique was applied in mechanism control. The tool feeding and the workpiece rotation synchronized by using time-base method of PMAC and achieved the noncircular auto turning. The result shows that it can improve the precision and efficiency of noncircular turning based on active disturbance rejection control.