Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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EVALUATION OF STRESS-STRAIN OF METALLLA BILLETS MADE TURN-BASED MOLDING METHOD OF MATHEMATICAL MODELING

Galkin V.V. 1 Cheburkov A.S. 1 Pachurin G.V. 1
1 ФГБОУ VPO Nizhny Novgorod state technical University. R.E.. Alekseev Nizhny Novgorod
Mathematical simulation of the large diameter tubular billets production with the stepwise bending method on the basis of the software product Deform 3D has been carried out. Results obtained includes the quantitative assessment of stress-strain state of metal in the tubular billets 1420×21.6 made with 11 and 17 steps, considering the redetermination of the size of real deformation center, arising on the bending with concentrated force. The residual stresses are calculated on the basis of theorem of unloading according to Hooke’s law. It is established, that strain state of molded pipe billets is characterized by non-uniformity, which is determined the peculiarity of the process of forming, in which a plastic bending is performed by a concentrated force. Valid deformation is beyond the scope of the geometry defined by the contact of the tool with the workpiece. The nature of the distribution of stresses in the volume of sheet blanks, at each step bending, similar to the distribution in it deformations. At the same time with the increase of the number of steps the amount of residual stresses and their maximum value increases.