Prediction of the Fracture of Metal in the Process of Screw Rolling in a Two-Roll Mill
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We study the process of two-roll screw rolling of billets made of stainless steel in order to estimate the influence of the feed angle on the plasticity of the metal of rolling billets. Pilot rollings were simulated by using the DEFORM software. In the computer simulation, the normalized Cockroft–Latham fracture criterion is used to predict the so-called Mannesmann effect (axial fracture of a billet). The comparison of the results of pilot rollings with the data of computer simulations showed that this fracture criterion is an efficient tool for the investigation of screw rolling. A procedure is proposed for the prediction of fracture of the metal subjected to screw rolling.
Keywordsscrew rolling Mannesmann effect normalized Cockroft–Latham fracture criterion plasticity fracture accumulated strains stiffness coefficient in the stressed state computer simulation
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