Combined Electrolytic Machining Tool Cathode and Method for Improving Flatness of Machining Bottom Surface

Abstract

The invention relates to a combined electrolytic machining tool cathode and a method, belonging to the field of electrolytic machining. The tool cathode of the present invention includes a tool handle, an insulating block, a conductive plate, a lead screw and a fastening screw. Aiming at the problems of stray corrosion and poor flatness of the bottom surface when the rod-shaped cathode tool is machining grooves, a combined electrolytic machining tool cathode for machining plane and shaft parts is proposed. Using a conductive plate with a thickness of less than 1mm limits the conductive area between the tool and the machined surface. Compared with the previous circular conductive area, the conductive area at the bottom is greatly reduced, and the machining along the radial feed direction of the tool cathode The electricity distribution at the bottom of the groove is equal everywhere, which effectively improves the flatness of the bottom of the groove in electrolytic machining. A long insulating boss and an insulating area larger than the width of the machining groove are designed, which increases the resistance and back pressure of the electrolyte flowing from the bottom of the tool to the machined surface, improves the flow field in the machining area, and effectively suppresses stray corrosion.

Description

technical field [0001] The invention relates to a tool cathode and a method for suppressing stray corrosion and overcutting phenomena in the electrolytic machining process and improving the flatness of the processed bottom surface, belonging to the field of electrolytic machining. Background technique [0002] The development level of the aerospace industry reflects the comprehensive strength of a country's economy and manufacturing industry, and the aerospace industry has put forward higher requirements for the performance of aircraft and engine structural parts and main materials. Due to the advantages of high-temperature alloys, titanium alloys and other difficult-to-machine materials, such as good rigidity, high specific strength, and relatively light weight, they have been widely used in the aerospace industry. For example, GH4169 material accounts for 34%, 56% and 57% of the total weight of CF6 engine, CY2000 engine and PW4000 engine respectively. However, due to the ...

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Problems solved by technology

However, due to the uneven power distribution in the feed direction, the flatness of the processed bottom surface is relatively poor.

In order to reduce stray corrosion, the tube electrode must be insulated, but the insulating layer covered later is easy to fall off due to the high temperature generated during the electrochemical discharge process, which will cause problems such as poor processing stability

In addition, due to the relatively small diameter of the tube electrode, the one-time processing range is limited, and the processing efficiency needs to be further improved.

Compared with the tube electrode, the uniformity of the electricity distribution on the bottom surface of the rectangular electrode in the feeding direction has been greatly improved; due to the internal spray liquid supply mode, the processed surface of the rectangular electrode should have a liquid outlet, which The radial size of the rectangular electrode is limited and cannot be further reduced

Compared with the tube electrode, the wide and thick processing surface of the rectangular electrode leads to a greatly reduced localization, and the overcut and stray corrosion of the processed bottom surface are more serious

In patents CN105921834A, CN108393547A, CN108080755A, etc., successively proposed tool cathodes and methods for improving the flatness of the bottom surface of electrolytic machining, but the surface of these tool cathodes has a large overcut value, and for the design of the bottom insulation, in the electrochemical discharge The high temperatures generated during the process are likely to render it ineffective

This greatly limits the application of electrolytic milling in machining planes, three-dimensional surfaces and cavities

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