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发表时间：2009-01-01

发表刊物：大连理工大学学报

所属单位：机械工程学院

期号：4

页面范围：518-525

ISSN号：1000-8608

摘要：By analyzing the proportion of three discharging states,the relationship between the discharging states and the discharging and controlling parameters in electrical discharge machining (EDM) is presented.The selection principle of discharging parameters is obtained,that is, appropriately increasing the open circuit voltage and lowering the peak current can enhance the processing efficiency and ensure good surface quality.Meanwhile,pulse-off has a greater effect on the short ratio,spark/arc ratio and discharging delay ratio,so adjusting the pulse-off can achieve a more stable control.Besides,according to the numerous and complex influencing factors of discharging states,instrumental variable method is used to further handle the biased autoregression model.The treatment of autoregression model by instrumental variable method, supplemented by the understanding of the dynamic properties of the EDM system,induces the applicable unbiased model with comparatively small loss function and high predictive precision.

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