Simulation of Rolling Process

Hi...

 I am doing 2-d simulation of rolling process using ABAQUS/CAE 6.5. I have done with rigid rolls but now I want to do with a deformable roll. I am giving boundary conditions for rotating the rolls at their position. For that, I define the centre of the roll as reference point and then used rigid body constraint. Then I give boundry conditions, U1=0, U2=0 and UR3= Non-zero at the refernce point. But now since I want to use deformable rolls, I can not the give rigid body constraint. Can somebody suggest me as to what kind of constraint should I use for constraining the reference point with the roll? Or some other method to  model deformable rolls?