Electric spark-electrolysis combined machining device and machining method with micro abrasive inward spraying function

Abstract

The invention discloses an electric spark-electrolysis combined machining device and machining method with a micro abrasive inward spraying function, and belongs to the field of micro-hole combined machining. The electric spark-electrolysis combined machining method with the micro abrasive inward spraying function is combined with abrasive grinding, electric spark corrosion and electrolytic corrosion, work liquid is sprayed out of a tube electrode with a certain pressure, the abrasive continuously impacts a workpiece, through the grinding effect, the surface insulation coating material is removed, after a metal matrix is exposed, the tube electrode is continuously fed, when the gap between the end face and the workpiece is smaller than the electric spark discharge gap, electric spark discharging appears in the end face and the workpiece under the high-pressure pulse effect, and high-speed punching is carried out; when the gap between the electrode side wall and the hole wall is largerthan the electric spark discharge gap, electrolysis corrosion removing is executed in the electrode side wall and the hole wall under the low-pressure pulse effect, the hole wall re-cast layer is removed, in the machining process, the abrasive is continuously supplied, machining efficiency is improved, small hole one-time rapid forming machining is achieved, operation is easy, and machining efficiency is high.

Description

technical field [0001] The invention relates to a method for processing micro-holes of tube electrodes, which belongs to the field of composite processing of micro-holes, in particular to an EDM-electrolysis composite processing device and a processing method of micro-abrasive internal spraying. Background technique [0002] As the part with the largest thermal load and mechanical load in the aero-engine, the turbine is subjected to the impact of high-temperature and high-pressure gas. In order to prolong the service life of the engine and improve the performance of the engine, there are a large number of air film holes with a diameter of 0.3~3mm on the turbine profile for cooling and heat dissipation. Turbine blades are usually made of difficult-to-machine materials such as high-temperature alloys, and recast layers, micro-cracks, and sharp edges are not allowed after small holes are machined, so manufacturing is extremely difficult. [0003] In addition, as the thrust-to-...

AI Technical Summary

Problems solved by technology

During the machining process, the abrasive concentration in the working fluid is changed by adjusting the throttle valve, and the material removal ratio of mechanical grinding and electric machining is controlled, so as to realize the conversion process from the initial partial machining to the middle and later partial electric machining, which solves the problems in the existing technology. The problem that the tiny holes on the parts with insulating coating cannot be processed purely by electricity

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