The voltage threshold method cannot count the open circuit time well and it needs to adjust the voltage threshold when changing the discharge voltage.A pulse recognition method based on slope ratio and variable statistical period is proposed.This method makes the detection device directly used in micro EDM rough grinding and fine grinding with two different open circuit voltages.It does not need to adjust the voltage threshold and can effectively count the open circuit time,thus improving the detec-tion efficiency and accuracy.Firstly,the Ni acquisition card and LabVIEW software were used to develop the pulse discriminating system,which can display the gap voltage,continuously store and split the file.Then,the slope ratio method and variable statisti-cal period method were analyzed theoretically,and the pulse recognition and statistical program were written.Finally,the experi-mental verification of discharge state detection was carried out.The results show that the method can identify different pulses and is suitable for different discharge voltages,and the program results are in good agreement with the actual results,which proves the effectiveness and practicability of the method.
关键词
微细电火花/放电状态检测/脉冲识别/斜率比值法/变统计周期
Key words
Micro-EDM/Discharge State Detection/Pulse Discriminating/Slope Ratio Method/Variable Statisti-cal Period
维普
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