Abstract
An isothermal model for the transport of lubricant in an upsetting operation with a rough workpiece is developed. It is shown that the workpiece roughness tends to increase the rate of outward lubricant transport. Experiments with rough aluminum workpieces lubricated with a silicone oil show a reduction in lubrication breakdown due to the improved lubricant transport. Transportation rates predicted by the model with a semi-empirical thermal correction show good agreement with experimentally determined transport rates.
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