what is Surface roughness
Surface roughness refers to the small spacing and the unevenness of small peaks and valleys that the machined surface has. The distance (wave distance) between the two wave crests or two wave troughs is very small (below 1mm), which belongs to the micro-geometric error. The smaller the surface roughness, the smoother the surface
Factors Affecting Surface Roughness of Wire EDM Machine
The line cutting finish is composed of two elements. One is the size of the pits removed by a single discharge, and its RZ is usually between 0.05μ and 1.5μ, which is secondary to the cutting finish. The second is the convex and concave stripes caused by the commutation. Its RZ is usually between 1μ~50μ, and it is possible to be as large as 0.1MM or more. This is the most important factor for the finish of the wire cutting. At the same time, it is accompanied by black and white stripes of reversal, giving people a very strong visual impact.
Control of the pit size due to a single discharge is relatively easy, simply by reducing the energy of a single pulse. It's just that the single pulse energy is so small that the thick workpiece cannot be cut, or even a non-sparking state with only short circuit and no discharge. This is similar to the fine standard in EDM, resulting in extremely low efficiency and poor chip removal ability. unstable processing. Moreover, the RZ caused by the discharge pits and the RZ caused by the commutation stripes are not in the same order of magnitude, so it is the most important to control the RZ accompanying the commutation stripes. The accuracy of the guide wheel and bearing, the constancy of tension when going up and down, etc., cause the movement trajectory of the wire to be inconsistent up and down. This mechanical factor is the main reason for the convexity and concavity of the commutation.
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