Virtual metrology frame technique for improving dynamic performance of a small size machine tool
Virtual metrology frame technique for improving dynamic performance of a small size machine tool
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提高小型机床动态性能的虚拟计量框架技术
DOI：
10.1016/j.precisioneng.2016.11.002
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Abir J
中科院分区：
文献类型：
--
作者：
Abir J
本文提出了一种新的概念，虚拟测量框架，以提高动态性能的机床与柔性结构框架。机床的动态性能直接受其机架刚度及其参考系统的影响;因此，通过采用无应力计量机架，可实现上级动态性能。所开发的概念不需要与计量框架相关的物理组件;因此，它是要求小占地面积和超精密性能的机床的理想选择。该概念依赖于基于加速度计的动态位移反馈技术，其中加速度计用作精密框架位移传感器。该概念不需要复杂的控制器，并且在现成的CNC控制器中实现。在一台小型数控机床的简化版直线运动系统上验证了该方案，伺服带宽和动态刚度分别提高了36%和70%，这是提高加工精度的关键参数。
This paper presents a novel concept, a virtual metrology frame, for enhancing the dynamic performance of a machine tool with a flexible structural frame. The dynamic properties of a machine are directly affected by the stiffness of its frame, and its reference system; thus, by having an unstressed metrology frame, superior dynamic capabilities can be achieved. The developed concept does not require physical components associated with metrology frame; hence it is ideal for machine tools with requirements for small footprint and ultra-precision performance. The concept relies on an accelerometer based dynamic displacement feedback technique, where the accelerometer is used as a precision frame displacement sensor. The concept does not require a complex controller, and was realized in an off-the-shelf CNC controller. The concept was demonstrated on a linear motion system, a simplified version of a compact size CNC machine, and its servo bandwidth and dynamic stiffness were improved by 36% and 70% respectively, which are the key parameters for improving the machining accuracy.