scholarly journals A Study of Precision Current Efficiency Curve Measurement with a Casing-Type Anode

2021 ◽  
Vol 11 (4) ◽  
pp. 1425
Author(s):  
Hao Wang ◽  
Jia Liu ◽  
Di Zhu
Keyword(s):  
Current Efficiency ◽  
Measurement Errors ◽  
Electrochemical Machining ◽  
Machining Process ◽  
Aviation Industry ◽  
Efficiency Curve ◽  
Type Method ◽  
Shape Prediction ◽  
Faraday’S Law ◽  
A Current

Electrochemical machining (ECM) is a non-traditional machining technology that is widely used in the manufacturing of key components in the aviation industry. The current efficiency is defined as the ratio of the observed amount of dissolved metal to the theoretical amount predicted from Faraday’s law. In ECM, the current efficiency curve relates the dissolution rate of the anode material and the current density. Accurate measurement of the current efficiency curve is the basis for anode shape prediction and cathode tool design. However, in conventional measurement methods, the phenomenon of edge stray corrosion introduces significant measurement errors. Improving the current efficiency is thus a challenging task for any electrophysical or electrochemical machining process. To improve the measurement accuracy, this paper proposes a current efficiency curve measurement with a casing-type anode. In the proposed measurement method, the anode is designed in two parts: the mandril and the casing. The edge stray corrosion effect is mainly concentrated on the casing, and only the current distribution on the mandril is considered in the calculation of current efficiency. The measurement simulations of the conventional and the proposed methods were carried out. The simulation results show that the casing-type method significantly improves the accuracy of current efficiency measurements, and the current efficiency curve of 304SS was obtained.

scholarly journals 2D Electrochemical Airfoil Machining Process Model

1995 ◽  
Author(s):  
H. A. Nied ◽  
M. S. Lamphere
Keyword(s):  
Process Model ◽  
Complex Geometry ◽  
Shape Change ◽  
Electrochemical Machining ◽  
Aircraft Engine ◽  
Machining Process ◽  
Field Equations ◽  
Workpiece Material ◽  
Faraday’S Law ◽  
Numerical Predictions

A 2D Electro-Chemical Machining (ECM) process model was developed to aid with tooling design and process optimization by simulation of the ECM process. The boundary element method (BEM) was used to numerically solve the field equations of the process model. The electrochemical anodic reaction was furnished by Faraday’s Law, which provided the relationship for the rate of dissolution at the surface of the workpiece as a function of charge transfer. Accordingly, the workpiece shape change and mass of metal removed by the machining process can be determined as a function of time. The process model includes a library of workpiece material and electrolyte combinations for predicting the electrochemical machining behavior, e.g., titanium alloy 6Al-4V and NaCl electrolytes. These metal/electrolyte combinations are of special interest in the aircraft engine industry for manufacturing heat-resistant, rotary components with complex geometry such as airfoil blades. The major features of the numerical computer program are briefly described with a selected example of machining a typical fan blade. Preliminary comparison of the numerical predictions with the nominal airfoil geometry showed good agreement and is discussed below.

Optimization of Turbine Blade’s Cathodes Feeding Routes in Three-Electrode Feeding Electrochemical Machining

2011 ◽  
Vol 201-203 ◽  
pp. 2737-2740
Author(s):  
Lei Wang
Keyword(s):  
Current Efficiency ◽  
Turbine Blades ◽  
Electrochemical Machining ◽  
Machining Process ◽  
Shape Evolution ◽  
Feeding Method ◽  
Factors Influencing ◽  
Improve Accuracy

To improve accuracy of turbine blades by electrochemical machining (ECM), a new cathode’s feeding method was studied. The rational optimization rules were proposed. Based on the theory of ECM, the blade’s shape evolution was analysed. The influence of the current efficiency brought by the passivating electrolyte, and flow factors influencing the machining process were also considered. According to the rules the cathode’s feeding route was optimized. By using the three-electrode feeding ECM machine, the cathode’s feeding routes can be varied flexibly.

Application of a filtration for determination of parameters of process of non-stationary electrochemical machining

2012 ◽  
Vol 9 (2) ◽  
pp. 113-117
Author(s):  
S.S. Porechny
Keyword(s):  
Current Efficiency ◽  
Stationary Process ◽  
Electrochemical Machining ◽  
Machining Parameters ◽  
Electrode Tool ◽  
Flat Electrode ◽  
Variable Function ◽  
Determination Of Parameters ◽  
A Current

The problem of modeling of process of electrochemical machining of metal by means of a flat electrode tool is considered. Modeling of non-stationary process of formation of a ledge on metal billet is carried out taking into account variable function of a current efficiency. Application of a method of a filtration for estimation of machining parameters is described.

Manufacturing With MicroECM

2006 ◽  
Author(s):  
David B. Stofesky
Keyword(s):  
Material Removal ◽  
Three Dimensional ◽  
Electrochemical Machining ◽  
Power Source ◽  
Industrial Applications ◽  
Machining Process ◽  
Application Time ◽  
Tool Steels ◽  
Electrode Gap ◽  
Faraday’S Law

Electrochemical Machining (ECM) has been widely used as a non-traditional three dimensional machining process for a variety of industrial applications. Electrochemical processing permits material removal of metals as diverse as aluminum, brass, tool steels, stainless steels, and titanium. Using cathodic tooling, a conductive electrolyte flowing through the electrode gap, controllable power source, and Faraday’s Law, predictable volumes of metal can be removed from the anodic substrate. Faraday’s Law states that the rate of material removal is proportional to the process current and application time, while Ohm’s Law states that current is inversely proportional to the impedance of the (electrochemical) circuit. MicroECM™ is an application of the ECM process that involves the removal of miniscule volumes of material from anodic substrates while holding micron level dimensional tolerances. This paper describes the process, its requirements, and typical applications for microECM™.

scholarly journals Process Understanding of Plasma Electrolytic Polishing through Multiphysics Simulation and Inline Metrology

Micromachines ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 214 ◽  
Author(s):  
Igor Danilov ◽  
Matthias Hackert-Oschätzchen ◽  
Mike Zinecker ◽  
Gunnar Meichsner ◽  
Jan Edelmann ◽  
...  
Keyword(s):  
Electrochemical Machining ◽  
Experimental Results ◽  
Machining Process ◽  
Electrolytic Polishing ◽  
Process Understanding ◽  
Simulation Results ◽  
Plasma Electrolytic ◽  
Special Case ◽  
A Current ◽  
Modelling Approach

Currently, the demand for surface treatment methods like plasma electrolytic polishing (PeP)—a special case of electrochemical machining—is increasing. This paper provides a literature review on the fundamental mechanisms of the plasma electrolytic polishing process and discusses simulated and experimental results. The simulation shows and describes a modelling approach of the polishing effect during the PeP process. Based on the simulation results, it can be assumed that PeP can be simulated as an electrochemical machining process and that the simulation can be used for roughness and processing time predictions. The simulation results exhibit correlations with the experimentally-achieved approximation for roughness decrease. The experimental part demonstrates the results of the PeP processing for different times. The results for different types of roughness show that roughness decreases exponentially. Additionally, a current efficiency calculation was made. Based on the experimental results, it can be assumed that PeP is a special electrochemical machining process with low passivation.

Methane synthesis from CO2 and H2O with electricity using H-permeable membrane electrochemical cells with Ru catalyst and phosphate electrolyte

2021 ◽  
Vol 5 (4) ◽  
pp. 935-940
Author(s):  
Jun Kubota ◽  
Takaya Okumura
Keyword(s):  
Current Efficiency ◽  
Electrochemical Cells ◽  
Permeable Membrane ◽  
Ru Catalyst ◽  
Electrochemical Conversion ◽  
A Current ◽  
Phosphate Electrolyte

Direct electrochemical conversion of CO2 and H2O to CH4 in a combined Ru-catalyst and H2O electrolyzer system was examined at 270 °C, thus obtaining a current efficiency of 93% for CH4 formation.

scholarly journals MODELLING OF THE OF ELECTROCHEMICAL MACHINING PROCESS

2007 ◽  
Vol 40 (18) ◽  
pp. 475-480
Author(s):  
Laurentiu SLATINEANU ◽  
Oana DODUN ◽  
Loredana SANTO ◽  
Margareta COTEATA ◽  
Adriana MUNTEANU
Keyword(s):  
Electrochemical Machining ◽  
Machining Process

Dramatic efficiency improvement in single-layer orange phosphorescent organic light-emitting devices with suppressed efficiency roll-off

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 55017-55021 ◽  
Author(s):  
Liangmei Zuo ◽  
Guangguang Han ◽  
Ren Sheng ◽  
Kaiwen Xue ◽  
Yu Duan ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Single Layer ◽  
Efficiency Improvement ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices ◽  
A Current

We have successfully demonstrated efficient single-layer organic light-emitting devices (OLEDs) with a current efficiency of 31.38 cd A−1.

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