National University of Science and Technology “MISiS” (Moscow, Russia):

N. M. Vavilkin, Dr. Eng., Prof., Metal Forming Dept.
S. M. Kriskovich, Senior Lecturer, Metal Forming Dept., e-mail: moose2@yandex.ru

The modeling of the process of screw piercing of hollow workpieces was carried out and the analysis of the results obtained was carried out in order to assess the possibility of additional study of the metal structure. Three-dimensional models of the working tool and workpiece were created in the SolidWorks software and two deformation zones of the piercing mill were assembled with different parameters of the feed angle and ovalization. In the Qform program, the parameters of the tool and the workpiece were set, the boundary conditions were formulated, and the process of piercing a particularly thick (D/S = 3.4) workpiece was simulated. The stress intensity parameter was chosen as a criterion for working out the structure, and its distribution field was obtained in three characteristic sections along the length of the deformation zone. When comparing the results obtained, the similarity of the distribution of the IU field at both settings of the deformation zone, as well as a higher level of IU for a larger feed angle is shown. The stress tensor is calculated in the first characteristic section and the presence of a three-dimensional opposite principal stress circuit is established. The dependences of the change in the metal force on the roll and the piercing time on the setting of the deformation zone have been obtained. The obtained values of the metal force on the roll can be used as a test, indicating an adequate choice of technical parameters of the piercing mill.

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