Achieving high accuracy and high removal rate in micro-EDM by electrostatic induction feeding method

CIRP Annals ◽  
2010 ◽  
Vol 59 (1) ◽  
pp. 219-222 ◽  
Author(s):  
T. Koyano ◽  
M. Kunieda
Keyword(s):  
Removal Rate ◽  
High Accuracy ◽  
Micro Edm ◽  
Feeding Method ◽  
Electrostatic Induction ◽  
High Removal Rate

High Spindle Speed Wire Electrical Discharge Grinding Using Electrostatic Induction Feeding Method

2010 ◽  
Vol 447-448 ◽  
pp. 268-271 ◽  
Author(s):  
Yuna Yahagi ◽  
Tomohiro Koyano ◽  
Masanori Kunieda ◽  
Xiao Dong Yang
Keyword(s):  
Material Removal ◽  
High Speed ◽  
Rotation Speed ◽  
Removal Rate ◽  
Spindle Speed ◽  
Workpiece Surface ◽  
Feeding Method ◽  
Electrostatic Induction ◽  
Micro Holes ◽  
Machining Characteristics

This paper describes machining characteristics of high spindle speed WEDG using the electrostatic induction feeding method. In this method, non-contact electric feeding allows the workpiece rod to be rotated at a high speed of up to 50000rpm. Since the temperature rise on the workpiece surface is low, the material removal rate was two times higher and the surface roughness was also improved compared to the normal RC discharge circuit where the rotational speed was 1000rpm at the highest due to contact electric feeding using a brush. Furthermore, micro rods thus prepared were used as tool electrodes to machine micro-holes with the same rotation speed of 50000rpm. It was found that smaller gaps and better straightness can be obtained due to the high flushing efficiency at the high spindle speed.

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 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.

Derivation of Optimum Study Factors for Samples Contaminated with Cd Using Electric/Magnetic Field and ORP

2013 ◽  
Vol 813 ◽  
pp. 519-524
Author(s):  
Sang An Ha ◽  
Jei Pil Wang
Keyword(s):  
Magnetic Field ◽  
Heavy Metals ◽  
Removal Rate ◽  
Underground Water ◽  
Liquid Electrode ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Removal Of Heavy Metals ◽  
High Removal Rate ◽  
Membrane Treatment

A purpose of the present study is to derive optimum study factors for removal of heavy metals using combined alternating current electric/magnetic field and electric membranes for the area contaminated with heavy metals in soil or underground water. ORP (Oxidation Reduction Potential) analysis was conducted to determine an intensity of tendency for oxidation or reduction of the samples contaminated with heavy metals, and electrical membrane treatment was used with adjustment of concentrations and voltages of liquid electrode (Na2SO4) to derive a high removal rate. Removal constants were analyzed to be 0.0417, 0.119, 0.1594 when the voltages were 5V, 10V, 15V, respectively, and treatment efficiency was shown to increase as the liquid electrode concentration was increased. Keywords: heavy metals, electric/magnetic field, ORP, electrical membrane

Numerical Prediction of Contaminant Removal from Cavity in Horizontal Channel by Constrained Interpolated Profile Method

2014 ◽  
Vol 695 ◽  
pp. 384-388
Author(s):  
Nor Azwadi Che Sidik ◽  
A.S. Ahmad Sofianuddin ◽  
K.Y. Ahmat Rajab
Keyword(s):  
Reynolds Number ◽  
Aspect Ratio ◽  
Removal Rate ◽  
Contaminant Removal ◽  
Square Cavity ◽  
Profile Method ◽  
Aspect Ratios ◽  
Contaminants Removal ◽  
Parabolic Flow ◽  
High Removal Rate

In this paper, Constrained Interpolated Profile Method (CIP) was used to simulate contaminants removal from square cavity in channel flow. Predictions were conducted for the range of aspect ratios from 0.25 to 4.0. The inlet parabolic flow with various Reynolds number from 50 to 1000 was used for the whole presentation with the same properties of contaminants and fluid. The obtained results indicated that the percentage of removal increased at high aspect ratio of cavity and higher Reynolds number of flow but it shows more significant changes as increasing aspect ratio rather than increasing Reynolds number. High removal rate was found at the beginning of the removal process.

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