Controllable Composite Machining Method and Vibration System of Microhole Vibrating Electrode Spark Electrolysis

Abstract

The invention provides a controllable vibrating electrode electric spark and electrolytic combined machining technological method and device for a single group of micro holes and belongs to the technical field of special machining. An ultralow-concentration neutral salt solution is taken as a working solution, corresponding pulse voltage is applied between the two electrodes, the electrodes vibrate in a reciprocating mode in the feeding directions of the electrodes, the gap between the two electrodes is adjusted by controlling the vibration between the electrodes, and the gap between the electrodes is made to be smaller than a spark discharge gap when the electrodes vibrate in the forward direction, so that an electric spark reaction occurs; the distance between the electrodes is larger than the discharge gap when the electrodes vibrate in the negative direction, so that spark discharge is changed into an electrolytic reaction gradually; when the distance between the electrodes is too large, the electrolytic reaction is ended, the working solution is switched to be in the deionization state, then the next machining cycle is conducted along with the feeding of the electrodes, and controllable combination of electric spark machining and electrolytic machining is achieved by optimizing the vibrating mode. By the adoption of the controllable vibrating electrode electric spark and electrolytic combined machining technological method and device, high surface quality can be obtained, and machining efficiency is improved; meanwhile, control over the machining process and machining consistency can be effectively guaranteed.

Description

technical field

[0001] The invention relates to an EDM-electrolysis controllable composite processing method and a vibration system of a micro-hole vibrating electrode, belonging to the technical field of special processing. Background technique

[0002] With the continuous development of the aviation industry, the design of the internal structure of the aero-engine is becoming more and more complex, and more and more micro-hole structures appear in its key components. Precision, high surface quality, and special requirements such as no burrs and sharp edges of the hole; 2) The parts materials that need to process tiny holes are generally high-strength and high-hardness difficult-to-machine materials, such as high-temperature alloys, titanium alloys, and intermetallic compounds etc.; 3) Due to the small hole diameter, the length-to-diameter ratio of micro-hole processing is often large; 4) There are special requirements for the metallographic structure of the hole wall, such...

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