Effect of the Nonuniform Distribution of the Mechanical Properties of Rolled Sheets on the Shape of a Round Billet after Forming in Making Large-Diameter Pipes

Calculation and experimental technique for evaluating the parameters of the contact interaction of a strip billet with a roll tool in the ERW mill lines

“…Different deformation tools and forming routes are used depending on dimension range of pipes. Combination of roll tools and choosing kinematic and power parameters should provide stable strip billet forming in the steady deformation area [8][9][10][11][12][13]. To achieve stable forming process, it is necessary to determine such contact interaction and contact area between deformation tool and strip billet, when metal forming at the contact surfaces is carried out and all required process technical parameters are calculated [14][15][16][17][18][19].…”