PCI-9846高速数字化仪在电火花放电特性测试中的应用

针对电火花放电间隙状态变化特性的检测与分析等问题，利用凌华PCI-9846四通道高速数字化仪建立了测量系统，讨论了电火花加工放电间隙放电特性测量方案，测量了不同加工状态下放电间隙两端的电压波形和电流波形，分析了空载、正常火花放电、过渡电弧放电和短路等不同加工状态下的电压波形特征及其特征参数。研究结果表明，正常火花放电、过渡电弧放电和短路等不同加工状态下间隙电压的阈值范围不同，且与加工电流有关；在设计伺服控制器时，应根据电源电压、加工电流、工件材料等来动态修正电压阈值。

Application of high-speed digitizer of PCI-9846 in electrical discharge characteristic measurement

Aiming at the electrical discharging characteristic with discharging gap, a measurement system was firstly constructed by using the 4-CH high speed digitizer of ADLINK PCI-9846. Then the method for measuring the electrical discharging characteristic with discharging gap was discussed, and the voltage waveforms and current waveforms between the two ends of the gap were measured. After the analysis of voltage waveforms and current waveforms, their characteristics for the machining states of zero load, normal electrical discharge, transient arc discharge, and short circuit were all acquired. The results indicate that the range of threshold voltage in the different machining states is different and associated with the current, then the range of threshold voltage must be corrected dynamically by the supply voltage, discharging current and workpiece material, which provides effective data for servo controller optimization.