We are performing micro machining with Electro Chemical Machining (ECM) process. We look forward for a mechanism to maintain constant gap between electrodes during machining
All so speechless?
We speak of ECM, and the work gap is defined by tool, electrolyte path and workpiece. Electrically, these are the two double layers between the electrodes and the electrolyte (resistance in parallel of the double layer capacitance) and the ohmic resistance of the electrolyte (electrical flow field). Therefore, if the working gap is to be kept constant, the voltage drop across the electrolyte must be constant. Since this distance is increased by the removal, this distance must be adjusted back to the desired degree.
For this purpose, they must know the electrical conductivity of their electrolyte, the average degree of contamination and the geometry of the electrode arrangement. In the case of the micro-ECM, the electrical resistances of the electrodes should be negligible (should be checked).
In the real loop, they still need to know which process energy source they are using and how much the impedance of the connection line is.
Dear Lijo,
There are some studies about gap control with using current values as dynamic feedback.
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