Electrode wire for electric spark discharge machining and preparation method thereof

The invention discloses an electrode wire for electric spark discharge machining and a preparation method of the electrode wire. The middle layer is positioned outside the core material; the surface layer is positioned outside the middle layer; wherein the core material is made of metal or alloy, and the middle layer is made of copper-zinc alloy; the surface of the middle layer is provided with pits, the surfaces of the pits are provided with micro-pits, the size of the micro-pits is smaller than that of the pits where the micro-pits are located, and the surface layer intermittently covers the middle layer and fills the pits and the micro-pits. In the preparation process, copper-zinc alloy is formed in the electrode wire through electroplating, heat treatment and stretching processes, and pits and micro pits are formed on the surface of the middle layer in an extrusion mode. By means of the method, the cutting speed during wire cut electrical discharge machining can be increased. 本发明公开了一种电火花放电加工用电极丝及其制备方法，包括：