| 摘要 |
A control system is provided for allowing complex shapes to be machined on a workpiece at high speed. The control system is computer (13) controlled and receives workpiece profile data which are converted into a succession of tool position signals during machining. Not all the digital signals are calculated at one time, a number of future digital signals are calculated during a succession of time intervals. In each time interval, a tool position signal is outputted which is of a constant amplitude corresponding to the required tool position and which is fed to a signal processor (19) where it is converted into a continuous signal which so changes progressively that at successive time intervals, equal to the time intervals of the tool position signals, the amplitude of the continuous signal is related to the successive values of the tool position signals. This continuous signal is fed to a closed-loop control system (22) which controls the movement of the tool holder in accordance with the continuous signal. The tool holder is of a type having a bandwidth sufficient to allow the required movements at the required speed. The control system has proportional and differential feedback (24, 25). |
