ABSTRACT
This chapter discusses in general terms, friction in the roll bite under dry and wet rolling conditions, the types of rolling lubricants that are commonly used, their methods of application, how they may be tested and how their frictional characteristics may be established from rolling mill data. In the cold rolling process, friction along the arcs of contact at the roll-strip interfaces is necessary for the transmission of deformation energy from the work rolls to the strip. If the frictional forces are too small, the peripheral speed of the roll will exceed the exit speed of the strip or, in other words, the rolls will skid. In temper rolling, in which high coefficients of friction are encountered in the roll bite, the principal objectives are the attainment of the desired metallurgical properties in the rolled strip and the desired finish of its surfaces.
