The influence of feed rate on process damping in milling: modelling and experiments
The influence of feed rate on process damping in milling: modelling and experiments
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DOI：
10.1243/09544054jem2141
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发表时间：
2011-06
期刊：
影响因子：
--
通讯作者：
N. Sims;M. S. Turner
中科院分区：
文献类型：
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作者：
N. Sims;M. S. Turner
被称为再生颤振的不稳定自激振动的开始，限制了铣削操作的性能。在过去的几十年里，已经有大量的研究帮助预测和解释再生颤动。因此，现在经常使用高速铣削操作，明智地选择主轴速度和切割深度，以避免抖动，同时保持高生产率。然而，越来越多地用于航空航天部件的许多材料由于其热性能而难以在高主轴速度下加工。例子包括钛和镍合金。对于这些材料，必须采用低速加工，在这种情况下，由于过程阻尼现象，人们对再生颤振的作用了解较少。在本研究中，建立了一种过程阻尼的时域模型。利用该模型研究了切削条件与颤振幅值之间的关系。实验行为与数值模型之间存在定性的一致性。特别是，该模型预测了工件进给速度(表示为每齿进给量)与工艺衰减波长定义的可接受颤振稳定性之间的强烈关系。需要进一步的工作来适当地校准一些模型参数。
The performance of milling operations is limited by the onset of unstable self-excited vibrations known as regenerative chatter. Over the past few decades there has been a great deal of research to help predict and explain regenerative chatter. Consequently, high-speed milling operations are now frequently employed, with judicious choice of spindle speeds and depths of cut so as to avoid chatter whilst maintaining high productivity. However, many materials that are increasingly used in aerospace components are difficult to machine at high spindle speeds because of their thermal properties. Examples include titanium and nickel alloys. For these materials, low-speed machining must be employed, and in this regime the role of regenerative chatter is less clearly understood due to the phenomenon of process damping. In the present study, a time domain model of process damping is developed. This model is used to explore the relationship between cutting conditions and the amplitude of chatter vibrations. A qualitative agreement is found between experimental behaviour and the numerical model. In particular, the model predicts a strong relationship between the workpiece feed rate (expressed as a feed per tooth), and the acceptable chatter stability defined by the process damping wavelength. Further work is needed to properly calibrate some of the model parameters.