Abstract
Abstract In rolling of titanium sheets, coating is severely formed on rolls by transfer of titanium from sheet surface. It increases rolling load and deteriorates quality of sheet surface. It was reported that small reduction per pass is effective to suppress the formation. However the suppression is insufficient for industrial processes. Other suppression techniques are demanded, however, the formation mechanism has not been revealed sufficiently. In this study, the formation was reproduced on a rolling mill in a laboratory. Influences of rolling conditions and of lubrication conditions have been investigated. It is found that the roll coating develops with summation of elongated length of the sheets and that lubrication with rolling oil is effective to suppress the coating. It is supposed that roll coating is formed by direct contact between the roll and titanium surface newly exposed by rolling.
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