Electrochemical Micromachining Using Electrostatic Induction Feeding Method

2012 ◽  
Vol 523-524 ◽  
pp. 305-309 ◽  
Author(s):  
Tomohiro Koyano ◽  
Masanori Kunieda
Keyword(s):  
Current Pulse ◽  
Pulse Duration ◽  
Electrochemical Machining ◽  
Pulse Voltage ◽  
Electrochemical Micromachining ◽  
Current Pulse Duration ◽  
Feeding Method ◽  
Electrostatic Induction ◽  
Pulse On Time ◽  
Side Gap

This paper describes micro electrochemical machining (ECM) using the electrostatic induction feeding method. In ECM, electrolytic dissolution can be localized in the area where the gap width is narrow by using pulse durations shorter than several tens of nano-seconds. With the electrostatic induction feeding method which has been developed for micro electrical discharge machining, the current pulse of such short durations can be obtained more easily compared with the conventional pulse generators. In this study, the influences of the pulse voltage of power supply and feeding capacitance on the machining current were investigated theoretically. It was found that the current pulse duration is nearly equal to the rise time and fall time regardless of the pulse-on time of the pulse voltage. Hence, ultra-short pulses can be obtained without a need to use an expensive pulse generator. Micro-hole drilling carried out in a sodium nitrate aqueous solution with current pulse duration of 30ns showed that significantly small side gap of 2μm could be obtained.

Investigation on the Electrochemical Micromachining of Micro Holes with Variable Cross-Section

2014 ◽  
Vol 644-650 ◽  
pp. 4927-4931
Author(s):  
Kun Wang ◽  
Meng Gao ◽  
Qi Shen
Keyword(s):  
Cross Section ◽  
Pulse Width ◽  
Electrochemical Machining ◽  
Processing Parameters ◽  
Variable Cross Section ◽  
Electrochemical Micromachining ◽  
Variable Cross ◽  
Machining Parameters ◽  
Micro Holes ◽  
Side Gap

Based on the principle of electrochemical, the processing mechanism of electrochemical machining (ECM) micro holes is analyzed and discussed, the processing model is established and the quantitative relationship is presented between the machining side gap and the electrochemical machining parameters (pulse width and pulse period, pulse frequency, duty ratio, etc.), workpiece material parameters and the parameters of the electrolyte, the electric double layer equivalent circuit constant with mathematical expression. On the basis of the analysis of the effect of processing parameters on the electrochemical machining accuracy and stability, process out the variable cross-section micro hole at an appropriate processing parameters of variable pulse width.

Wire Electro Discharge Machining of Al/SiC Metal Matrix Composite

2011 ◽  
Vol 121-126 ◽  
pp. 564-567
Author(s):  
Bao Ji Ma ◽  
Yu Quan Zhu ◽  
Xiao Li Jin
Keyword(s):  
Surface Roughness ◽  
Current Pulse ◽  
Pulse Duration ◽  
Cutting Speed ◽  
Machining Performance ◽  
Peak Current ◽  
Positive Effects ◽  
Electro Discharge Machining ◽  
Input Variables ◽  
Pulse On Time

The machining characteristics of SiC/Al composite using wire electro discharge machining (WEDM) were investigated in this study. Material cutting speed and surface roughness value were adopted to evaluate the machinability. Peak current, pulse on time, pulse duration and working voltage were selected as the input variables to investigate the machining performance. Effects of input variables on the cutting speed and surface roughness were experimentally tested. Peak current, pulse on time and working voltage were confirmed to have positive effects on cutting speed and surface roughness value. Whereas the cutting speed and surface roughness value decrease with the increase of pulse duration.

Machining Characteristics of EDM Using Gas Media

2011 ◽  
Vol 189-193 ◽  
pp. 3123-3130 ◽  
Author(s):  
Yao Jang Lin ◽  
Yan Cherng Lin ◽  
A Cheng Wang ◽  
Yuan Feng Chen ◽  
Han Ming Chow
Keyword(s):  
Current Pulse ◽  
Pulse Duration ◽  
Air Pressure ◽  
Electrode Wear ◽  
Machining Parameters ◽  
Environment Impact ◽  
Current Pulse Duration ◽  
Machined Surface ◽  
Peak Current ◽  
Machining Characteristics

The aim of this study is to construct a diverse process of electrical discharge machining (EDM) in gas media, and then the new developed machining approach was used to investigate the effects of machining parameters on machining characteristics. Firstly, the feasibility of the EDM in gas media was established with consecutive electrical sparks generated within the machining gap. Moreover, the main machining parameters such as peak current, pulse duration, machining polarity, and gas media supply conditions like air compressed pressure were varied to evaluate the effects on machining characteristics of SKD 61 mold steel in the developed EDM process. The surface morphology of machined surface was observed by a scanning electronic microscope (SEM) to determine the influences of EDM discharge energy on surface integrities. From the result shown in experiments, the material removal rate (MRR) increased with peak current, pulse duration, and air pressure. In addition, the electrode wear rate (EWR) went up with peak current at first, and then attained a peak value with extending the pulse duration and the air pressure, but the EWR declined with further increasing of the pulse duration and the air pressure. Furthermore, the integrities of the machined surface revealed dramatically rough features when the peak current was set at high value. While the pulse duration was further extending, the surface integrities of the machined surface exhibited a smoothened trend obtained by EDM in gas media. Consequently, the developed technique of EDM in gas media possesses the potential of promoting machining performance, reducing environment impact, and extending the EDM applications.

scholarly journals Experimental investigation of the electrochemical micromachining process of Ti-6Al-4V titanium alloy under the influence of magnetic field

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
T. Praveena Gopinath ◽  
J. Prasanna ◽  
C. Chandrasekhara Sastry ◽  
Sandeep Patil
Keyword(s):  
Magnetic Field ◽  
Titanium Alloy ◽  
Removal Rate ◽  
Electrochemical Machining ◽  
Machining Process ◽  
Electrochemical Micromachining ◽  
Machining Accuracy ◽  
Micro Hole ◽  
Neodymium Magnets ◽  
Pulse On Time

Abstract An attempt has been made to study the influence of magnetic field on the micro hole machining of Ti-6Al-4V titanium alloy using electrochemical micromachining (ECMM) process. The presence of magneto hydro dynamics (MHD) is accomplished with the aid of external magnetic field (neodymium magnets) in order to improve the machining accuracy and the performance characteristics of ECMM. Close to ideal solution for magnetic and nonmagnetic field ECMM process, the parameters used are as follows: concentration electrolyte of 15 g/l; peak current of 1.35 A; pulse on time of 400 s; and duty factor of 0.5. An improvement of 11.91–52.43% and 23.51–129.68% in material removal rate (MRR) and 6.03–21.47% and 18.32–33.09% in overcut (OC) is observed in ECMM of titanium alloy under the influence of attraction and repulsion magnetic field, respectively, in correlation with nonmagnetic field ECMM process. A 55.34% surface roughness factor reduction is ascertained in the hole profile in magnetic field-ECMM in correlation with electrochemical machined titanium alloy under nonmagnetic field environment. No machining related stress is induced in the titanium alloy, even though environment of electrochemical machining process has been enhanced with the presence of magnetic field. A slight surge in the compressive residual factor, aids in surge of passivation potential of titanium alloy, resulting in higher resistance to outside environment.

scholarly journals Effect of current pulse duration in recovering quantitative induced polarization models from time-domain full-response and integral chargeability data

2019 ◽  
Vol 218 (3) ◽  
pp. 1739-1747 ◽  
Author(s):  
Per-Ivar Olsson ◽  
Gianluca Fiandaca ◽  
Pradip Kumar Maurya ◽  
Torleif Dahlin ◽  
Esben Auken
Keyword(s):  
Current Pulse ◽  
Pulse Duration ◽  
Time Domain ◽  
Induced Polarization ◽  
Current Pulse Duration ◽  
Polarization Models
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