Authors: RakhimyanovKh.M., VasilevskayaS.I., RakhimyanovK.Kh.

Title of the article: Technological limitations in the electrochemical drilling of small diameter deep hole

Year: 2018, Issue: 4, Pages: 5-15

Branch of knowledge: Mechanical engineering and machine science

Index UDK: 621.9.047

DOI: 10.26730/1999-4125-2018-4-5-15

Abstract: The relevance of the small holes formation is explained by the intensive industry development, medical equipment improvement. The use of high-strength structural materials limits the possibilities of traditional processing methods associated with mechanical dimensional processing. Special attention to electrophysical technologies is explained by the search for solutions to these problems. However, the lack of technological studies in the use of electrophysical methods in microprocessing determines the relevance of research in this direction. The specific feature of these methods is determined by the combination of electric-physical-chemical processes implemented in processing. The variety of interrelated parameters of these processes does not allow simplified decisions in the assignment of operating parameters. It is the complexity of the experimental ap-proaches for their establishment that determines the feasibility of a theoretical study of processes to identify existing limitations and to find ways to eliminate them. The paper discusses the theoretical aspects of electrochemical processes in the processing of materials and defines the range of operating parameters during the formation of holes. It is established that when small holes are drilled by a hollow cathode - tool, limitations arise due to the loss of pressure on the local resistances of the hydraulic path. It is shown that the accuracy of shaping along the hole length is achieved by using a processing scheme with a hollow cathode - tool with an electrical insulating layer on the side surface. It is established by theoretical calculations that the presence of such a layer on the cathode-tool leads to a significant limitation of the range of operating parameters of the electrochemical drilling. The algorithm for assigning operating parameters based on the initial drawing requirements for the hole being processed is proposed as an example of the calculation of the electrochemical drilling scheme of a hole in copper by a hollow cathode – tool.

Key words: electrochemical dimensional processing interelectrode gap hydraulic path small-hole drilling copper algorithm for assigning operating parameters cathode-tool shaping accuracy local losses technological limitations

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