Authors: Kh.M. Rakhimyanov, S.I. Vasilevskaya, K.Kh. Rakhimyanov, S.V. Dzhavadova

Title of the article: The role of anionic composition of electrolyte in the electrochemical machining of small diameter holes

Year: 2018, Issue: 2, Pages: 107-112

Branch of knowledge: Mechanical engineering and machine science

Index UDK: 621.9.047

DOI: 10.26730/1999-4125-2018-2-107-112

Abstract: The problems of the choice of the anionic composition of electrolytes during electrochemical dimensional machining (ECM) of small holes in copper with a hollow cathode – tool with an internal diameter 0.26 mm and external diameter 0.46 mm are considered. It is confirmed that when dissolving copper in chloride solutions on the surface of the processed material, a hardly soluble chemical compound CuCl forms, which impedes the process of forming the accurate profile of the small hole at the initial moment of its penetrating. It is shown that in the nitric acid and sulphate solutions during copper treatment anodic dissolution is carried out under the end face of the cathode-tool. It has been found that with the use of nitric acid and sulphate solutions in the treatment of copper, it is possible to drill small holes with a minimum electrochemical gap of 0.05 mm, thus ensuring not only an increase in the localization of the process, but also a high accuracy of copying the shape of the cathode – tool.

Key words: Electrochemical dimensional machining electrochemical gap neutral electrolyte small hole drilling copper stainless steel cathode – tool electrolyte jet anode hardly soluble chemical compound CuCl

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