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- W2040771551 abstract "Abstract The cleanliness of rolled aluminum sheet is important for the cosmetic properties of the metal and its downstream performance in forming operations. The surfaces of rolled sheet are covered by residual rolling oil and inorganic debris produced during rolling. This wear debris is often labelled as smut or smudge. In this paper we examine effects on smut formation of various tribological parameters associated with high-speed cold rolling. Experimental variables include metal entry temperature, roll roughness, and lubricant properties such as chemistry and viscosity. Surface attributes of the metal; cleanliness, topography and residual oil were measured before and after rolling. Mill data such as currents, rolling loads, forward slip, tensions and speeds are monitored to allow calculations of rolling friction. Metal cleanliness is found to deteriorate under conditions where hydrodynamic lubrication dominates. Low smut levels were correlated with relatively high metal entry temperatures. Further analysis of sheet topography and rolling friction data suggests that this temperature effect is related to the oil film thickness in the roll bite. Smut decreases with decreasing oil film thickness and therefore increases with decreasing friction. Changes in lubricant composition, with the exception of using methyl esters with weak load bearing properties, and roll roughness have a relatively small effect on cleanliness. In practical terms, a clean aluminum surface can be produced under conditions that minimize surface break-up. Thus for cold rolling, a relatively small hydrodynamic component of lubrication is favoured. This necessitates rolling at relatively high temperatures with thin lubricant films of large load bearing capacity." @default.
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- W2040771551 date "1994-09-01" @default.
- W2040771551 modified "2023-09-25" @default.
- W2040771551 title "Roll bite conditions controlling formation of wear debris during cold rolling of aluminum" @default.
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- W2040771551 doi "https://doi.org/10.1016/0924-0136(94)90328-x" @default.
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