Control of High-Speed Machining Systems Using Direct Spindle and Feed Drives

9522815曹刀具材料和主轴技术的最新进展有可能大大提高材料去除率。要实现这一目标，需要高动态刚度和精确的运动和速度控制，以保持精度。直接驱动技术消除了伺服与刀具或主轴运动之间的齿轮减速。这可能意味着高性能，但它也消除了伺服和最终运动可以解耦的手段。这意味着要在加工系统中实现直接驱动的潜力，必须将驱动动力学包含在系统的动力学模型中。本研究将完成内环鲁棒反馈控制、外环重复控制与控制跟踪控制、最优前馈/预览控制的理论设计。加工过程的动态力学模型代表了直接驱动加工系统在运行过程中所受的载荷。测试这些直接驱动控制概念的两个实验是研究的一部分：两轴高进给速度铣削和变主轴转速加工以抑制颤振。这些结果将为直接驱动加工的动力学和控制提供基本的理解，可用于设计下一代高性能直接驱动加工系统。＊＊＊

9522815 Tsao Recent advances in tool materials and spindle technology have the potential to dramatically increase material removal rates. To achieve this requires high dynamic rigidity and precise motion and speed control to maintain accuracy. Direct drive technology eliminates the gear reduction between servo and the tool or spindle motion. Potentially this means high performance, but it also eliminates the means by which the servo and the final motion can be decoupled. This means that to achieve the potential of direct drives in machining systems, the drive dynamics have to be included in the dynamic model of the system. This research will complete the theoretical design of an inner loop robust feedback control, outer loop repetitive control and control tracking control, and optimal feedforward/preview control. Dynamic mechanistic models of the machining process represent the loads presented to a direct drive machining system during operation. Two experiments to test these direct drive control concepts are part of the research: two axes high feed rate milling, and variable spindle speed machining for chatter suppression. These results will provide fundamental understanding of the dynamics and control of direct drive machining that can be used to design the next generation of high performance direct drive machining systems. ***