Novosibirsk, Russia, May, 30 – June, 4, 2011

International Conference
"Modern Problems of Applied Mathematics and Mechanics: Theory, Experiment and Applications", devoted to the 90th anniversary of professor Nikolai N. Yanenko

Любанова А.Ш.   Зиборов А.Ю.  

Optimization of the uniformity of a metal flow during

Reporter: Любанова А.Ш.

   To produce high-quality products with the minimum energy consumed for the deformation of a billet, it is necessary to optimize the tool design and shape in designing metal forming schedules by studying the character of a metal flow in a deformation zone.
   The kinematic features of the continuous extrusion of a workpiece from a container one part of which is movable with respect to the other part substantially increases the nonuniformity of a metal flow in the deformation zone of the complete contact zone before the die. The metal flow gradient along the deformation-zone boundaries leads to nonuniform properties and poor quality of the product surface. This drawback is most pronounced when granulated or powdered materials and metallic chips are used as a workpiece for continuous extrusion.
   The experimental data in demonstrate that the main factor affecting the nonuniformity of deformation when a metal flows into the die is its location in the ring insert, which is controlled by the angle between the longitudinal axes of the die and container.
   Abstract—The scheme of plastic deformation of a billet in a container is considered as part of continuous extrusion by the Conform method. A mathematical model of the motion of a viscoplastic Bingham liquid is used to determine the metal velocity distribution in the plastic-deformation zone. As a result, the optimum angle between the longitudinal axes of the die and container is estimated. This angle is found to be one of the main factors affecting the nonuniformity of deformation when a metal flows into the die. The calculated results are compared to experimental data.

Abstracts file: lubanova and ziborov.doc
Full text file: lubanova_ziborov.doc


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