Steel rougness
Surface roughness (or just roughness) (Ra unit) is a feature of solid (object, steel) surface. It is measured by optical or mechanical examination of flatness divergence which don’t reflect it geometrical shape. Rougness measure count on about scale at least one order of magnitude smaller than standard measure unit. We differentiate rougness from waviness of steel sheet surface which is can be an outcome of machine construction, vibration caused by circular parts or so. Rougness mainly depends of kind of steel and machining method. We describe it with Ra symbol followed by a destined value. For example Ra 2,25 is equal to abrasive flow machining. The change in surface roughness decreases with the increase in cross section of the work-piece and also increases with the increase in length of the work-piece. Quality polishing can give Ra value even with 0,01 precision.
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in categories: steel, steel cutting, technology |