Abstract
The application of water-solution lubricants to cold rolling processes is attractive because they have the potentialto conserve clean environments around rolling mills, and are also superior because of their easy maintenance and long life for circulated use. Polyalkylene glycols (PAGs) are representative components of metalworking solution lubricants. However, their application to industrial use is difficult because of their poor lubricity. In this study, conditions for the improvement of lubricity are investigated, especially for the high-speed cold rolling conditions of steel strips. It is found that the lubricant solutions can be improved to the level of oil-in-water emulsions if the amount of plated-out lubricant on the steel surface is sufficiently large by increasing the polymer concentrations in water and the surface temperature of the strip. Also, it is concluded that further investigations on additives are necessary to improve boundary lubrication properties in order to apply the lubricant solutions to industrial cold rolling processes.
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