Machining precision and working principle of slow wire erosion

Slow wire erosion,also known as slow wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire (called electrode wire, generally copper wire) as the electrode to conduct pulse spark discharge on the workpiece, generate a high temperature of more than 6000 degrees, corrode the metal, and cut the workpiece. The principle of slow wire processing is the phenomenon of continuous discharge to remove metal from the gap between the wire electrode and the workpiece.

The Chinese name is Low Speed Wire Cut, the foreign name is Low Speed Wire Cut, the alias is low speed wire feed, the principle of continuous wire supply, the electrical erosion feature is smooth and clean, and the accuracy is within 0.01mm

Because the slow wire cutting machine adopts the mode of continuous wire supply of wire electrode, that is, the wire electrode is processed during the movement process, so even if the wire electrode is worn, it can be continuously supplemented, so it can improve the processing accuracy of parts. The surface roughness of the workpiece processed by the slow wire cutting machine can generally reach Ra=0.8 μ M and above, and the roundness error, straightness error and dimension error of the slow-moving WEDM are much better than those of the quick-moving WEDM, so the slow-moving WEDM is widely used when machining high-precision parts. In addition to the early small and medium-sized enterprises, it is also very common in the processing plants of large enterprises such as aviation, automobile and medical treatment.

      How it works Edit broadcast

Slow wire is a kind of processing machine tool that uses continuously moving fine metal wire (called electrode wire) as electrode to conduct pulse spark discharge to remove metal and cut and shape the workpiece. There is a loose contact light pressure discharge phenomenon between the wire electrode and the workpiece during slow wire machining. When the flexible electrode wire and the workpiece are close to the commonly considered discharge gap (for example, 8~10 μ m) Spark discharge does not occur even when the electrode wire has contacted the workpiece and the gap is not visible from the microscope. Normal spark discharge occurs only when the workpiece bends the electrode wire and deviates a certain distance (several microns to tens of microns). At this time, every 1 feed of wire electrode μ m. Discharge gap does not decrease by 1 μ m. Instead, the electrode wire increases a little tension between wires, and the workpiece increases a little lateral pressure. Obviously, spark discharge can only be formed after a certain slight contact pressure is maintained between the electrode wire and the workpiece. It is believed that there is some kind of insulating film medium produced by electrochemistry between the electrode wire and the workpiece.