The basic working principle of wire cutting is to use continuous moving thin metal wire (called wire cutting electrode wire) as the electrode, to carry out pulsed spark discharge corrosion on the workpiece, cutting molding.Line is mainly used for a variety of complex shape and small precision workpieces, such as wire-cutting processing die punch, concave die, intensive, fixed plate, stripper plate, etc., forming tools, model, linear cutting can also processing all kinds of micro hole groove, narrow gap, any curve, etc. The cutting has many incomparable advantages, such as: wire cutting has a small machining allowance, wire cutting, high machining accuracy, cutting with short production cycle, thread cutting has low manufacturing cost advantages, wire-cutting has obtained widespread application in the production.The edm can operate normally and must meet the following conditions:
1. A certain gap must be maintained between molybdenum wire and the processed surface of the workpiece. The width of the gap is determined by processing conditions such as working voltage and processing quantity.
2. During the processing of edm wire cutting machine, it must be carried out in the liquid medium with certain insulation performance, such as kerosene, saponified oil, deionized water, etc. High insulation is required to facilitate the generation of pulsed spark discharge. The liquid medium also has the effect of removing the electric erosion products in the gap and cooling electrodes.If the gap between molybdenum wire and the workpiece is too large, the interelectrode voltage cannot break through the interelectrode medium, then spark discharge cannot be produced.If the gap is too small, it is easy to form a short circuit connection, also can not produce spark discharge.
3. Pulse power supply must be adopted, that is, spark discharge must be impulse and intermittent.In the pulse interval, the gap medium is disionized, so that the next pulse can breakdown discharge between the poles.
