Friction and Slip in the Cold Rolling of Metals

Abstract

Friction and slip in the cold rolling of metals were studied theoretically using a mixed lubrication model. The calculated results generally agree with published observations as follows: (1) tension, reduction, oil viscosity, speed, and alloy are important to slip, (2) reduction, oil viscosity, roll radius, speed, and alloy are important to friction, (3) a decrease in friction does not always produce lower forward slip, (4) Ford's coefficient of friction cannot predict the frictional behavior even qualitatively in certain cases, and (5) slip decreases linearly with increasing speed and viscosity.