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为了使多台电火花机床同时工作时遥测其加工状态成为可能,作者详尽地研究了加工时的电磁辐射频谱。通过实验证实:在近场内,电火花加工中的电磁辐射是有限带宽的白噪声,其“特证频率”是由于接收天线与测试仪器的阻抗失配引起的。而在远场内,所呈现的“特征频率”则是机床阻抗特性的反映,不同型号和尺寸的机床所辐射的信号频谱上就出现不同的“特征频率”。这样,能实现在车间环境中多台电加工机床同时工作时分别遥测它们的加工状态。
In order to make it possible for telegraphing the machining status of multiple EDM machines simultaneously, the author thoroughly studied the electromagnetic radiation spectrum during machining. Experiments show that: in the near field, EDM electromagnetic radiation is a limited bandwidth of white noise, the “special frequency” is due to the receiving antenna and the test equipment impedance mismatch caused. In the far field, the “characteristic frequency” presented is a reflection of the impedance characteristics of the machine tool. Different “characteristic frequencies” appear on the signal spectrum radiated by the machine tools of different models and sizes. In this way, in the workshop environment can be achieved when more than one machine tool at the same time telemetry their machining status.