In the work were set and solved the task of the FEM simulation process, the screw piercing blank on the double roller mill with mushroom-shaped rolls. The decision of the task allowed us to calculate the power parameters of screw piercing of the workpiece, and analysis of dimensional accuracy of the casings. The adequacy of the models is proved by comparison of calculated and experimental values of the force parameters of rolling and sizes of casings. The implementation of technical solutions allowed us to ensure high stability of the rolling of thin-walled shells with size 328 × 433 of 20,55 mm × 26,9 mm.