Welding Preparation Technology of Nested Hollow Electrode for Micro Electrolytic Machining

Abstract

The invention relates to a welding preparation process for a nested hollow electrode for micro-electrolytic machining. The welding preparation process is used for solving the problem that electrolyte renewal and product discharge are difficult at the intervals of micro-electrolytic machining. The process comprises the following procedures, namely a micro hollow tube wire penetrating procedure, a medium-sized tube bonding procedure, a metal tube nesting size and position adjusting procedure and a nested hollow electrode welding procedure, and specifically comprises the steps: firstly, penetrating a cylindrical thin wire into a prepared micro hollow tube; secondly, inserting the micro hollow tube penetrated by the wire into an internal hole of a medium-sized tube, and bonding one end of the medium-sized tube to the external wall of the micro hollow tube penetrated by the wire , so as to form a combined electrode; then, extending the combined electrode into a large-sized tube, and controlling the length, extending into the large-sized tube, of the medium-sized tube of the combined electrode; finally, welding one end of the medium-sized tube to the large-sized tube, and then, welding the other end of the medium-sized tube to the micro hollow tube. The preparation process has the advantages that the coaxiality of the large-sized tube and the micro hollow tube can be guaranteed, and the hollow electrode can have a consistent electrical conductivity and a high-pressure electrolyte communication sealing ability; the process is accurate and controllable in the preparation process and is applicable to the batched mass production.

Description

technical field [0001] The invention relates to a welding preparation process of a nested hollow electrode for micro-electrolytic processing, which belongs to the field of special processing. Background technique [0002] Micro electrolytic machining is a subtractive machining method that uses the principle of anodic dissolution in electrochemical redox reactions to etch anodic workpieces into shape. The processing current in the gap causes the atoms on the metal workpiece to lose electrons and become ions to dissolve from the workpiece. This process of etching material in the form of ions can theoretically achieve a processing accuracy of micron or even nanometer level, which makes micro-electrolytic machining play an important role. Mechanistically, it has the processing ability at the micro scale. In addition, micro-electrolytic machining is a non-contact electrical machining method, which has the advantages of not being limited by the mechanical properties of materials,...

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Problems solved by technology

[0009] The aforementioned tool electrode preparation methods for micro-electrolytic machining, such as wire electrode grinding or electrochemical corrosion, are difficult to prepare micro-electrodes with a hollow structure, and a hollow metal tube with a diameter of 100-200 μm is used as a preparation method for a micro-electrode There are few reports, which are mainly restricted by the following factors: the radial dimension of the fine hollow metal tube itself is very small, making it difficult to connect and seal the fine hollow metal tube with the high-voltage electrolyte; It is also difficult; in terms of clamping, on the premise of ensuring high-pressure sealing and connecting the electrolyte, it is difficult to ensure the coaxiality of the fine hollow metal tube and the axis of the main shaft and the straightness of itself in the clamping; therefore, how to solve The above problems are the key points in the preparation process of fine hollow electrodes

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