Evaluating the Adequacy of a Mathematical Model of the Piercing of a Billet Into an Ultra-Thick-Walled Shell on a Two-High Rotary Rolling Mill

A physical experiment involving the piercing of a billet into an ultra-thick-walled shell is carried out on two-high mill 130D at the Moscow State Institute of Steel and Alloys. With the same process parameters as in the experiment, a mathematical model of the piercing operation is constructed by using the finite-element computing system in the software Deform 3D. The degree of agreement between the mathematical model and the physical experiment is evaluated on the basis of such indices as the geometric parameters of the pierced shell, the helix angle, and one of the kinematic characteristics – the time that elapses from the moment the billet contacts the rolls to the moment it contacts the mandrel.