Abstract
Mill rolls finished by electrical discharge texturing (EDT) are widely used in the manufacture of steel and aluminium alloy sheet / strip. Appropriate selection of process operating parameter levels: peak current, onloff time, polarity, etc., allows a limited degree of independence in specifying roll surface topography in t e r n of surface roughness (Ra), peak count (Pc) and skewness (Rsk), in order to meet specific functional requirements. Experimental work aimed at determining the effect these operating parameters has been carried out and comprehensive surface topography measurements made using a variety of non contact (white light interferometer and laser units) and stylus contact systems. The paper details the significant differences, which occurred in results for Pc and Rsk values between the various measuring devices. In contrast, Ra measurements were fairly consistent. Replicated Rsk readings taken on a Wyko machme 6 months apart typically varied by 300%, and in one case changed from -1.1 to +0.65. Similarly, when comparing results from two apparently identical Wyko units, significant differences were found in Pc, by up to 200%. 3D Talysurf stylus measurement of the same workpiece surfaces gave wildly different Pc values fiom those obtained on the Wyko units, despite use of the same slice levels and analysis software.
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