Lathe stability charts via acoustic emission monitoring
Lathe stability charts via acoustic emission monitoring
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DOI：
10.4314/ajst.v2i2.44675
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发表时间：
2009-07
期刊：
影响因子：
--
通讯作者：
J. Keraita;Hj Oyango;G. K. Misoi
中科院分区：
文献类型：
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作者：
J. Keraita;Hj Oyango;G. K. Misoi
表征金属切削过程中检测到的声发射（AE）的信号参数已在理论上以简单的方式相关的工作材料的属性，切削条件，和工具的几何形状。在颤振过程中，切削条件和刀具几何形状会发生相当大的变化。自激颤振是切削过程与机床结构相结合的不稳定性，是机床的基本性能限制。在本文提出的研究结果中，AE信号参数发生的变化已被用来检测颤振的发作，从而绘制稳定性图表，在车削操作。除了显示稳定性的边界线外，这些图表还可用于确定必要的变化，以最小限度地消除颤振或不造成生产损失。研究的信号参数包括AE平均强度水平，功率谱的偏斜度和峰度，以及发射的计数率。
Signal parameters characterizing acoustic emission (AE) detected during metal cutting have been theoretically correlated in a simple manner, to the work material properties, cutting conditions, and tool geometry. During chatter, the cutting conditions and the tool geometry change considerably. Self-exited chatter, an instability of the cutting process in combination with the machine structure, is a basic performance limitation of machine tools. In the research findings presented in this paper, changes occurring to AE signal parameters have been used to detect the onset of chatter and hence plot stability charts, during a turning operation. Apart from showing the borderlines of stability, such charts can be used to identify the necessary changes required to eliminate chatter at minimum or no loss of production. The signal parameters investigated include AE mean intensity level, the skew and kurtosis of the power spectrum; as well as the count rate of the emissions.