The working principle of wire cutting fast wire

The working principle of wire cutting fast wire

Wire EDM can be divided into three types according to the wire speed: fast wire, slow wire and vertical self-rotating wire EDM. The fast-moving wire electrode wire makes high-speed reciprocating motion, the wire speed is 8~10m/s, the electrode wire can be reused, and the processing speed is high. It is the main type of production and use in our country. Wire EDM is to connect the electrode wire to the negative electrode of the pulse power supply and the workpiece to the positive electrode of the pulse power supply. After the high-frequency pulse power supply is energized, when the distance between the workpiece and the electrode wire is less than the discharge distance, the pulsed electrical energy makes the medium (working fluid) ) Ionization breakdown, forming a discharge channel, under the action of the electric field force, a large number of negatively charged electrons rush to the positive electrode at a high speed, and the positively charged ions rush to the negative electrode. The high temperature generated by ionization causes the surface of the workpiece to melt or even vaporize , So that the metal is thrown out with the movement of the electrode wire and the impact of the working fluid, thereby forming pits on the surface of the workpiece.

In the high temperature zone, due to the polarity effect, the energy distributed between the electrode wire and the workpiece is different, so the surface temperature of the electrode wire and the workpiece is also different, and because the melting temperature of the electrode wire is much higher than the melting temperature of the workpiece material, at the same time, the electrode wire The wire leaves the high temperature zone at a high speed, so the erosion amount of the electrode in the high temperature zone is much smaller than the erosion amount of the workpiece, which makes the surface of the workpiece form larger pits, and the surface of the electrode wire forms very small dents. Hole, continuous pulse discharge cuts the workpiece with the required shape and size.