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在微铣削加工过程中,实现位置的快速和精确定位是保证微细切削加工质量的前提条件。为了验证微铣削系统的高精度和高加减速特性,对直线电机进行了动态性能测试。针对直线电机驱动器在位置、速度及转矩等控制模式的不同特征,分别在3种模式下进行了在线伺服参数调整和PID优化,建立伺服参数调整模型,提高机床动态响应性能。采用正交实验的方法,分别在微动和宏动情况下,对比分析了3种控制模式对微铣削系统的不同影响,根据其不同的动态响应能力,选择适合微铣削机床直线电机伺服系统的控制模式。位置模式下,直线电机驱动平台实现了在给定加速度30 m/s2,速度200 mm/s下,定位误差在1μ之内。
In the micro-milling process, to achieve fast and accurate positioning of the position is to ensure the quality of the micro-cutting process preconditions. In order to verify the high precision and high acceleration / deceleration characteristics of the micro-milling system, the linear motor was tested for dynamic performance. According to the different characteristics of the linear motor driver such as position, speed and torque, the online servo parameters and PID optimization are respectively carried out in three modes. The servo parameter adjustment model is established to improve the dynamic response performance of the machine tool. Using the orthogonal experiment method, the different influences of the three control modes on the micro-milling system are analyzed under the condition of fretting and macro-motion separately. According to their different dynamic response capabilities, the control of the linear motor servo system for the micro-milling machine is selected mode. Position mode, the linear motor drive platform to achieve a given acceleration of 30 m / s2, speed 200 mm / s, positioning error within 1μ.