Working solution variable fluidic device adopting high-speed electric spark line cutting

Abstract

The invention discloses a working solution variable fluidic device adopting high-speed electric spark line cutting. A horizontal ring-shaped cavity of a disc at the upper part of a flow guide sleeve is communicated with a working solution inlet of a fluidic cover plate; a locking ring, a cam groove circular ring and a fluidic groove body are arranged on the circumference of the flow guide sleeve in a matching manner; a plurality of fluidic grooves are formed in the radial direction of the fluidic groove body; the upper end of a fluidic strip is spaced in an arc-shaped cam groove through a guide pole in pin joint with the fluidic strip; and the guide pole moves in the radial direction along with the rotation of the cam groove circular ring, so that the fluidic strip generates different slopes. As the working solution fluidic angle is changed by adjusting the angle of the fluidic strip, the variable fluidic device can adjust the distance between the convergent point of working solution on a wire electrode and a workpiece cutting slot, so as to ensure that the working solution wraps the wire electrode with a proper flow velocity and a proper convergent point. Therefore, the vibration of the wire electrode is absorbed, the stability is enhanced, the interelectrode internal flow field flowage is improved, and the discharge of corrosion removing products and the cooling of a processing area are accelerated, which better suits the cutting requirements of workpieces with large and variable thickness.

Description

Technical field [0001] The invention relates to the field of wire electric discharge cutting equipment, in particular to a working fluid variable jet device for high-speed wire electric discharge cutting. Background technique [0002] Wire EDM is a non-contact, special machining method without significant mechanical cutting force. It uses the instantaneous local high temperature generated during pulsed spark discharge between the electrode wire and the workpiece to cause the dielectric breakdown between the discharge points on the surface of the workpiece. Metal is melted, gasified and cut into shape. The working fluid acts as a discharge medium in the online cutting process, while cooling and taking away the erosion products in the cutting seam. Its performance directly affects the process indicators of the wire cutting process, which is important for ensuring the machining accuracy, surface quality and Production efficiency plays an important role. There are usually two ways ...

AI Technical Summary

Problems solved by technology

[0003] There are many disadvantages in the way of pouring liquid supply: for example, when cutting workpieces with large thickness and variable thickness, high energy processing is often used, but when the pulse width increases to a certain extent, the strong discharge heat will cause a large amount of gas in the working fluid between the poles instantaneously. The physical state of the working medium between electrodes has also changed, from a single liquid state to a gas-liquid two-phase state, which can easily cause severe burns on the cutting surface, and the electrode wire cannot be cooled in time, causing burnout in severe cases

Another disadvantage is that due to gasification, the inter-electrode working fluid is reduced, resulting in poor chip removal between the electrodes, causing the erosion products to start to accumulate, and the cooling time is short, and the molten erosion products have no time to cool and reapply between the electrodes. Condensation will cause a decrease in the dielectric strength between the electrodes, resulting in fewer delayed breakdown discharge waveforms, and an increase in abnormal discharges such as short circuits, resulting in unstable processing and serious short circuits, which restrict the improvement of cutting efficiency and precision.

[0004] The coaxial liquid injection liquid supply method can timely replenish the working fluid lost by gasification between the electrodes under the action of huge discharge heat through liquid injection. Although it improves the deterioration of the cooling state between the electrodes under the condition of large energy, it improves to a certain extent The cutting efficiency is improved and the surface quality is improved. However, when the spray liquid supply method is used, the distance between the nozzle and the workpiece slit has a great influence on the cutting. There is very little working fluid in the room, which cannot achieve the effect of forced cooling, and it will also generate large vibrations on the electrode wire, which is easy to break the wire during processing.

And this distance is fixed, it is difficult to adjust

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