Slow wire walking, also called low-speed wire walking, uses continuously moving fine metal wires (called electrode wires, generally copper wires) as electrodes to pulse spark discharge on the workpiece to produce a high temperature of over 6000 degrees, ablate metal, and cut A kind of CNC machining machine tool into a workpiece. The principle of slow-moving wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge.

　　Slow wire is a kind of processing machine tool that uses continuously moving fine metal wires (called electrode wires) as electrodes to perform pulse spark discharge ablation and cutting of the workpiece. The loose contact light-voltage discharge phenomenon between the wire electrode and the workpiece during slow wire processing. When the flexible electrode wire and the workpiece are close to the generally considered discharge gap (for example, 8-10μm), no spark discharge occurs. Even when the electrode wire has touched the workpiece and the gap is no longer visible in the microscope, it is often not visible. When it comes to sparks, normal spark discharge occurs only when the workpiece bends the electrode wire and offsets a certain distance (a few micrometers to tens of micrometers). At this time, every time the wire electrode feeds 1μm, the discharge gap does not decrease by 1μm, but the wire electrode increases the tension between the wires a little bit, and the workpiece increases a little bit lateral pressure. Obviously, only after a certain slight contact pressure is maintained between the wire electrode and the workpiece To form a spark discharge. Based on this, it is believed that there is some kind of electrochemically generated insulating film medium between the electrode wire and the workpiece.

　　Since the slow-moving wire cutting machine adopts the method of continuous wire feeding of the wire electrode, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, which can improve the machining accuracy of the parts. The surface roughness of the workpiece processed by the slow-moving wire-cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire-cutting machine are much better than that of the fast-moving wire cutting machine, so in processing For high-precision parts, slow-moving wire cutting machines have been widely used. In addition to the early small and medium-sized enterprises, it is also extremely common in the processing plants of large enterprises such as aviation, automobiles, and medical treatment.