scholarly journals Study on Influence of Stray Capacitance on Micro EDM using Electrostatic Induction Feeding

2008 ◽  
Vol 13 (0) ◽  
pp. 35-40 ◽  
Keyword(s):  
Micro Edm ◽  
Stray Capacitance ◽  
Electrostatic Induction

Study on Influence of Stray Inductance in Micro EDM Using Electrostatic Induction Feeding Method

2010 ◽  
Vol 447-448 ◽  
pp. 263-267 ◽  
Author(s):  
Xiao Dong Yang ◽  
Yong Wan ◽  
Fu Qiang Hu
Keyword(s):  
Experimental Investigation ◽  
Pulse Generator ◽  
Negative Influence ◽  
Discharge Circuit ◽  
Tool Electrode ◽  
Micro Edm ◽  
Discharge Energy ◽  
Stray Capacitance ◽  
Feeding Method ◽  
Electrostatic Induction

In the micro EDM method by electrostatic induction feeding, a pulse generator is coupled to the tool electrode by a capacitor, since the negative influence of the stray capacitance in the circuit can be eliminated, and the discharge energy per pulse can be minimized, thereby realizing discharge craters of nanometer order. However, there is still the stray inductance in the discharge circuit, other than the stray capacitance. In this study, in order to examine the influence of the stray inductance, experimental investigation was conducted.

scholarly journals Development of Micro EDM using Electrostatic Induction Feeding

2006 ◽  
Vol 72 (5) ◽  
pp. 636-640 ◽  
Author(s):  
Michihiro HANADA ◽  
Masanori KUNIEDA ◽  
Ichiro ARAIE
Keyword(s):  
Micro Edm ◽  
Electrostatic Induction

Micro EDM by Stray-Capacitance-Coupled Electric Feeding

2012 ◽  
Vol 516 ◽  
pp. 245-250 ◽  
Author(s):  
Tomohiro Koyano ◽  
Masanori Kunieda
Keyword(s):  
Current Pulse ◽  
Power Supply ◽  
Discharge Current ◽  
Tool Electrode ◽  
Micro Edm ◽  
Discharge Energy ◽  
Stray Capacitance ◽  
Pulse Power Supply ◽  
Feeding Method ◽  
Pulse Peak

With the electrostatic induction feeding method which has been developed by the authors to decrease the minimum discharge energy in micro EDM, non-contact electric feeding to the tool electrode is possible, since a pulse power supply is coupled to the tool electrode by capacitance. In this study, the non-contact electric feeding was carried out with stray capacitance only, and hence machining could be carried out without an electric feeder or equipment for electric feeding to the tool electrode. With the stray-capacitance-coupled electric feeding method, since the stray capacitance was significantly small, a discharge current pulse peak of 200 mA and 3 ns in duration was obtained, realizing discharge craters of 0.8 μm in diameter. A micro-hole of 13.5 μm in diameter was drilled successfully in a stainless steel plate with a thickness of 30 μm. In order to change the discharge energy, a capacitor was connected between the pulse power supply and the work piece. Machining results showed that crater diameters can be decreased by decreasing its capacitance. It was also found that smaller crater diameter can be obtained with a lower pulse voltage. Moreover, in order to minimize the discharge energy, the tool electrode was insulated from the mandrel to decrease the stray capacitance. As a result, a discharge current pulse peak of 130 mA and 2 ns in duration was obtained, and the diameter of discharge craters could be decreased to 0.6 μm.

scholarly journals Miniaturization of Micro EDM Using Electrostatic Induction Feeding Method

2010 ◽  
Vol 76 (10) ◽  
pp. 1151-1155 ◽  
Author(s):  
Masahito KIMORI ◽  
Masanori KUNIEDA
Keyword(s):  
Micro Edm ◽  
Feeding Method ◽  
Electrostatic Induction

Multiple Discharges Phenomena in EDM Using Electrostatic Induction Feeding Method

2012 ◽  
Vol 523-524 ◽  
pp. 316-321
Author(s):  
Guang Lei Feng ◽  
Xiao Dong Yang ◽  
Kun Tian ◽  
Xue Zhi Wang
Keyword(s):  
Single Pulse ◽  
Opposite Polarity ◽  
Pulse Voltage ◽  
Voltage Source ◽  
Tool Electrode ◽  
Micro Edm ◽  
Discharge Energy ◽  
Negative Pulse ◽  
Feeding Method ◽  
Electrostatic Induction

In the micro EDM method by electrostatic induction feeding, a pulse voltage source is coupled to the tool electrode by a capacitor in order to reduce the minimum discharge energy per pulse. Positive pulse voltage and negative pulse voltage are applied to the tool electrode alternately, relative to the workpiece. In this study, it was found that when the feeding capacitance was large, multiple discharges occurred frequently during a single pulse duration of the pulse voltage source. Since the impedance of the pulse voltage source which was produced by the authors varied depending on the polarity, the multiple discharges occurred in the polarity with the higher impedance, while they did not occur in the opposite polarity. It was also found that when multiple discharges occurred, the discharge energy was released intermittently in the multiple discharges. In this study, using multiple discharges phenomena, better surface was obtained with higher removal speed.

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