STEADY-STATE PLANE-STRAIN COLD-ROLLING OF A STRAIN-HARDENING MATERIAL

Knowledge of the roll force and torque and of the interfacial stresses is important for the design of rolling equipment and for analysing ro ll deformation. In this work, a model for the steady-state plane-strai n cold rolling of a strain-hardening material is proposed which can pr edict the roll force and torque with reasonable engineering accuracy o ver the usual range of process variables. The model is able to simulat e the neutral point with the help of Coulomb's law with constant coeff icient of friction. The effects of various process variables (reductio n ratio, roll-radius-to-work-thick ness ratio and coefficient of frict ion) on the roll force and torque and on the interfacial stresses are also studied. Further, it is shown that if strain-hardening is neglect ed, these parameters are under-estimated to a significant degree. As t he quality of the rolled product depends on the deformation pattern, t he paper also investigates the effects of the process variables and st rain-hardening on the deformation.