The wire cutting finish is composed of two elements: one is the size of the pit removed by single discharge, and its RZ is usually 0.05 μ~ 1。 five μ Between, this is secondary to the cutting finish. The second is the concave and convex stripes caused by commutation, and its RZ is usually 1 μ~ fifty μ Between, big to zero. It is also possible to have more than 1m, which is the most important factor in the finish of the line cutting. At the same time, it is accompanied by the black and white stripes with commutation, which has a strong visual impact.
It is easy to control the pit size due to single discharge, and only the energy of a single pulse needs to be reduced. Only the single pulse energy is small to a certain extent, which causes the thick workpiece to be cut and not moving, even the short circuit is not discharged without spark. This is similar to the fine gauge in EDM, which results in the unstable machining with extremely low efficiency and poor chip discharge capacity. Besides, RZ caused by discharge pit is not in the same order of magnitude as that of commutation fringes, so it is important to control RZ with commutation fringes. The accuracy of guide wheel and bearing, the constant tension of up and down lead to the inconsistent movement track of the wire up and down, which is the main reason for the reverse convex concave. The manufacturing quality of the wire walking part is the key to the surface quality of the whole machine
