Wire EDM is to perform pulse discharge machining on the workpiece through the relative movement of the linear east-west electrode and the workpiece electrode. The anode of the pulse power supply is connected to the workpiece, and the cathode is connected to the electrode wire. The wire electrode moves relative to the workpiece at a certain speed in its axial direction to make it uniform and has low loss. The working fluid is sprayed between the electrode wire and the cutting seam of the workpiece, or Between the wire electrode and the slit of the workpiece. The workpiece can be immersed in the working fluid for processing, and the worktable of the workpiece is controlled to move longitudinally and laterally according to a certain trajectory, and a workpiece of a certain shape and size can be cut.

  A certain gap needs to be maintained between the wire EDM molybdenum wire and the machined surface of the workpiece. The width of the gap is determined by processing conditions such as operating voltage and processing amount. When machining, it needs to be carried out in a liquid medium with certain insulating properties, such as kerosene, saponified oil, deionized water, etc., high insulation is required to facilitate the occurrence of pulse spark discharge, and the liquid medium must clear the gap. For the function of internal electro-corrosion products and cooling electrodes, there must be a gap between the molybdenum wire and the machining surface of the workpiece. If the gap is too large, the inter-electrode voltage cannot break down the inter-electrode dielectric, and no spark discharge will occur. If the gap is too small, it is easy to form a short-circuit connection, and there will be no spark discharge, and a pulsed power supply must be used, that is, the spark discharge must be pulsed and intermittent. Within the pulse distance, the interstitial medium is deionized, so that the next pulse breaks down and discharges between the north and south poles, and wire cutting is used to cut conductive metal materials. Its basic working principle is to use a continuously moving thin metal wire as an electrode to perform pulse spark discharge on the workpiece, remove the metal and cut it into shape. , Stripper, etc., forming tools, prototypes, metal electrodes for EDM, etc.

  Wire EDM mainly relies on thermal expansion and local micro shot peening to throw away the molten and vaporized metal materials. The main disadvantage of cutting is that blind holes cannot be processed, only through holes can be processed. Therefore, its application in injection mold processing is not as extensive as EDM.