Electrode wire for wire electric discharge machining and preparation method thereof

Abstract

The invention provides an electrode wire for wire electric discharge cutting and a preparation method thereof, which comprises a brass wire core and a cladding layer covering the wire core. There are three-dimensional dendritic cracks inside the cladding layer, and some of the three-dimensional dendritic cracks The cracks extend to the surface of the electrode wire so that discontinuous "V" or / and "chevron" cracks are formed on the surface of the electrode wire, and the tip of the crack points to the stretching direction of the electrode wire during processing. The present invention also provides a preparation method of the electrode wire for wire electric discharge machining. The invention can reduce the discharge wear of the conductive block during the slow-moving wire electric discharge machining process by forming discontinuous "V" or / and "herringbone"-shaped cracks on the surface of the electrode wire.

Description

【Technical field】 [0001] The invention belongs to the field of mechanical processing, and in particular relates to an electrode wire for electric discharge wire cutting and a preparation method thereof. 【Background technique】 [0002] Slow-moving wire EDM machines are powered by conductive blocks, and the electrode wire is usually used as the positive electrode of the discharge, directly sliding contact with the conductive block made of hard alloy material to transmit the high peak current of the power pulse. Therefore, the conductive block cannot Avoid wear and tear. [0003] Theoretically, the contact surface between the electrode wire and the conductive block is close to a line, and there is a relative sliding friction speed, which is the wire speed of the machine tool. Usually slow wire EDM is divided into rough cutting and finishing. During rough cutting, due to the high wire speed, large transmission power pulse current, and large spark discharge energy, the electrode...

AI Technical Summary

Problems solved by technology

This will not only cause large mechanical wear of the conductive block, but the high-speed movement of the electrode wire with longitudinal wave and transverse wave vibration will also cause ineffective contact between the two contact pairs (electrode wire and conductive block), which will easily induce contact between the conductive block and the electrode wire. Generates an electroerosion spark discharge in series with the discharge gap

Once the electric erosion spark discharge occurs between the electrode wire and the conductive block, this pulse discharge in an aerobic environment will cause the burn of the conductive block, thereby accelerating the mechanical wear of the conductive block

Moreover, the electric erosion spark discharge between the conductive block and the electrode wire is often easy to intensify, and finally causes the shutdown to be disconnected and the conductive block to be severely ablated and scrapped

[0004] With the development of the slow wire EDM industry, the cutting speed is becoming faster and faster, especially when processing thick and large workpiece mold materials for rough cutting and high-speed processing, so the conductive block will be used for a period of time. It is very easy to cause excessive wear and lead to scrap, and the precision of the cut workpiece is relatively poor

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