A wire electric discharge cutting device and a method for controlling liquid volume between electrodes

Abstract

The invention discloses an electric spark wire cutting device. The electric spark wire cutting device comprises a liquid supply system and a cutting system, wherein the liquid supply system is used for providing an inter-electrode working solution, and the cutting system is used for machining a workpiece by using an electric discharge wire; the cutting system comprises a lead barrel, a plurality of guide wheels and an electrode wire, wherein the electrode wire winds the wire barrel and the guide wheel and can be driven by the wire barrel to move between the guide wheel and a discharging gap; and the liquid supply system comprises a nozzle capable of spraying the working solution, and the nozzle sprays the working solution on the electrode wire of the wire barrel, so that the electrode wireis wrapped with the working solution, and the working liquid amount between the electrodes can be controlled by controlling the wire speed of the electrode wire; and the wire barrel drives the electrode wire to enter the electrode wire wrapped with the working solution into the discharging gap.

Description

Technical field [0001] The invention relates to the field of electric spark cutting. Background technique [0002] Wire EDM is the use of electrode wire to perform pulse discharge corrosion processing on the workpiece. When the voltage between the electrodes is greater than the breakdown voltage, the liquid medium between the electrodes is ionized to form a discharge channel, and the material near the discharge point is melted and vaporized at a high temperature instantaneously. Under the combined action of the force and the electrode wire, the electro-erosion products are taken out of the workpiece, forming overlapping electro-erosion pits. Through experiments and thermal conduction analysis, Dibitino et al. concluded that only about 18% and 8% of the energy allocated to the workpiece and electrodes, 74% of the energy is absorbed by the working fluid, and the energy loss is large. He Ciwen and others studied the mechanism of working fluid and emphasized that the amount of fluid...

AI Technical Summary

Problems solved by technology

The pouring type is to pour the working fluid sideways on the discharge area of ​​the workpiece. The nozzle and the electrode wire are not in the same axis, and there is a certain angle, which cannot form a water column. The pouring type is easy to impact the electrode wire, which seriously affects the finishing quality of multiple cutting.

The coaxial normal pressure liquid spray type is to spray liquid up and down, the nozzle is coaxial with the electrode wire, although the coaxial normal pressure liquid spray type reduces the disturbance of the electrode wire and improves the cooling state between the electrodes, but there are six small spray holes in the nozzle The injected working fluid is prone to bifurcation, and the working fluid splashed on the surface of the workpiece will disturb the electrode wire, making it difficult to form a water column. Neither the pouring type nor the liquid spraying type can accurately control the amount of working fluid entering the discharge gap.

The current working fluid supply structure only relies on the flow control valve to control the spray volume and pressure, and cannot automatically adjust the inter-electrode working fluid volume according to the cutting conditions. It cannot accurately control the inter-electrode working fluid according to the cutting conditions, which affects processing. quality

[0004] Patent announcement number: CN206169428U, the patent document with announcement date of 2017.05.17 discloses a high-speed wire-cut electric discharge machining structure. The electrode wire is wrapped by the working fluid of the upper working box and the lower working box. The vibration of the electrode wire, the electrode wire passes through the working fluid, it is difficult to control the wire speed and bring it into the inter-electrode working fluid

At the same time, the structure disclosed in this patent needs to set the upper working box and the lower working box with complex structures and difficult placement of workpieces.

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