Anti-short-circuit porous high-efficiency flushing electrode for arc discharge machining

Abstract

A short circuit prevention porous efficient liquid flushing electrode for arc discharge machining is characterized in that the electrode is cylindrical; the central area of the bottom of the electrodeis provided with a blind hole along the electrode axis; a plurality of inner liquid flushing through holes are distributed in one periphery of the outer side area of the bottom of the electrode in the axial direction; the side face of the electrode is provided with a plurality of liquid flushing chip discharge grooves, so that the side face of the electrode forms a discontinuous surface; each liquid flushing chip discharge groove is open in the bottom face of the electrode; and the openings of the liquid flushing chip discharge grooves and the inner liquid flushing through holes are formed ina staggered mode. According to the electrode, the decompression effect on work liquid from a non-discharge machining area can be reduced effectively, strong inner liquid flushing of the discharge machining area is maintained, a short circuit phenomenon is prevented, the quality of the machined surface is promoted, the machining rejection rate is lowered, and uniformity of electrode loss and the precision of the machining size are improved.

Description

technical field [0001] The invention relates to arc discharge machining, in particular to an anti-short circuit porous high-efficiency flushing electrode for arc discharge machining. Background technique [0002] At present, when multi-axis linkage high-speed arc discharge machining workpieces with complex shapes with three-dimensional features, all the existing disclosed electrodes have large peripheral losses due to discharge losses, and the central area is raised so that it is easier to contact with the workpiece and cause short circuit problems. When machining non-planar surfaces, the discharge is usually concentrated on the edge of the electrode. On the one hand, the center of the electrode is prone to short-circuit and arcing. At the same time, there is no back pressure at the outlet of the flushing fluid in the non-discharge machining area, and there is an obvious pressure relief effect, which leads to the effective flushing in the machining gap. Less, the effective ...

AI Technical Summary

Problems solved by technology

Good results will be achieved when using this tool electrode to process simple cavities or regular planes, but when processing multi-axis linkage workpieces with complex shapes, after the electrode is worn out, the pressure relief effect of the working fluid in the non-processing area is significantly enhanced and enters the processing gap The specific gravity of the effective flushing liquid is small, which leads to the instability of the arc discharge machining state

[0005] According to the patent search, Di Shichun et al. proposed a new type of EDM electrode in the patent CN204295081U, which has a step-type electrode structure that can flush liquid without dead ends during processing. The internal flushing liquid cannot directly rush to the discharge area at the front end of the electrode, resulting in a dead angle for flushing liquid and low EDM efficiency

However, due to the loss of this kind of electrode after processing workpieces with complex shapes and the outflow resistance of the outer ring hole is smaller than that of the center hole, the flow rate and pressure of the working fluid entering the discharge gap through the center hole are small and the pressure is low, while the outer ring hole The flushing liquid belongs to the external flushing liquid, and the flow rate of the working fluid entering the discharge gap is low, so the flushing effect in the discharge gap is not ideal

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