Threaded pipe electrode matching internal and external flushing EDM-electrolysis combined hole making method

Abstract

The invention provides a threaded tube electrode matching internal and external flushing electric spark-electrolysis combined hole making method. In the high-speed electric spark hole making process stage, the electric spark pulse power supply is connected, and the deionized water is fed in by the internal flushing method, and the matching The threaded tube electrode rotates and feeds downward at the same time. When the distance between the electrodes reaches the spark discharge gap, a pulse electric spark is generated to erode the workpiece material. Small particles of eroded solids are quickly discharged upwards. When the workpiece is broken down, keep the electrode position unchanged, connect the electrolysis power supply and replace it with an external flushing liquid, and spray the electrolyte into the gap with the external nozzle, match the threaded tube electrode to rotate in reverse, and the threaded groove can accommodate more electrolyte Entering the narrow gap, the workpiece undergoes anodic dissolution reaction, and the electrolytic flocs are quickly discharged downward under the extrusion of the thread groove. The invention not only guarantees the high precision and high efficiency of micro-hole manufacturing, but also realizes the processing requirements of no micro-cracks and no recast layer on the hole wall.

Description

technical field [0001] The invention relates to the technical field of special processing, in particular to a combined hole-making method of electric spark-electrolysis combined with internal and external flushing liquid for threaded pipe electrodes. Background technique [0002] With the continuous development of aviation, aerospace and other fields, there are a large number of tiny holes on the key parts of its products, such as the film cooling holes of the turbine blades of the aeroengine, the holes of the combustion chamber flame tube, the engine fuel injector, the sealing ring, etc. The micro-holes and group holes have the characteristics of small size, large number, high precision, no recast layer and micro-cracks on the machined surface, and most of the materials used are difficult-to-machine materials such as cast high-temperature alloys, titanium alloys, and cobalt-based alloys. Therefore, , Micro hole machining for small size, high precision, high efficiency, and ...

AI Technical Summary

Problems solved by technology

However, the small gaps in the micro-pores themselves have the problem of electric erosion and small solid particles that are difficult to discharge, and the introduction of abrasives will aggravate this problem, and the stability of the processing process is difficult to guarantee.

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