Analysis method for investigating the influence of mechanical components on dynamic mechanical error of machine tools
Analysis method for investigating the influence of mechanical components on dynamic mechanical error of machine tools
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DOI：
10.1016/j.precisioneng.2012.02.006
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发表时间：
2012-07
影响因子：
3.6
通讯作者：
D. Kono;A. Matsubara;Kotaro Nagaoka;K. Yamazaki
中科院分区：
文献类型：
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作者：
D. Kono;A. Matsubara;Kotaro Nagaoka;K. Yamazaki
在机床中，刀具中心点的位置与控制系统的位置检测器的位置之间的差导致动态机械误差，该动态机械误差作为反馈控制的工作台位置与刀具相对于工作台的位置（刀具-工作台相对位置）之间的差而获得。本文提出了一种分析方法来粗略地确定引起动态机械误差的机械系统的组成部分。提出了两种研究机械元件对动态机械误差影响的方法，即双编码器法和四加速度计法。在这两种方法中，频率响应函数之间的反馈控制的工作台的位置和工具工作台的相对位置进行评估。利用所提出的方法，对高精度加工中心在X和Y方向上的动态机械误差进行了分析，频率高达200 Hz。结果发现，整个频率范围可以分为三个不同的子范围，这取决于机械系统的组件如何影响在不同频率的动态机械误差。分析结果表明，在低频范围内，从动件的动态响应对动态机械误差的影响起主导作用。在此基础上，测量了实验机在小圆周运动时的动态机械误差。动态机械误差发生在微米级。动态机械误差可以从所提出的方法测量的频率响应函数估计。
In machine tools, the difference between the position of the tool center point and that of position detectors of the control system leads to a dynamic mechanical error, which is obtained as the difference between the feedback-controlled table position and the position of the tool relative to the table (tool–table relative position). In this paper, analysis methods are proposed to roughly determine the component of the mechanical system that causes the dynamic mechanical error. Two methods, a two-encoders method and a four-accelerators method, for investigating the influence of the mechanical component on the dynamic mechanical error are proposed. In both methods, the frequency response function between the feedback-controlled table position and the tool–table relative position is evaluated. By the proposed methods, the dynamic mechanical error of a high-precision machining center in the X and Y directions is analyzed for frequencies up to 200Hz. It was found that the entire frequency range could be divided into three distinct subranges depending on how the component of the mechanical system influences the dynamic mechanical error at different frequencies. The analysis results indicated that in the low-frequency range, the dynamic response of the driven component plays a dominant role in influencing the dynamic mechanical error. Then, the dynamic mechanical error of the experimental machine was measured for small circular motions. The dynamic mechanical error occurred at the micrometer level. The dynamic mechanical error can be estimated from the frequency response function measured by the proposed method.