Удосконалення процесів кутового пресування на основі моделювання рівноканальної пластичної течії матеріалів

Аналіз режимів, конструктивних особливостей штампового оснащення. Огляд підвищення якості виробів і зниження технологічних відходів на основі розвитку методик обчислення процесу рівноканального кутового пресування і вибору параметрів штампового оснащення.

Рубрика Производство и технологии
Вид автореферат
Язык украинский
Дата добавления 11.08.2015
Размер файла 920,2 K

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ABSTRACT

Perig, A. V.: Angular Pressing Process Improvement Based on a Simulation of Equal Channel Plastic Flow of Materials. - Manuscript.

Dissertation for a Candidate's Degree in Engineering, Speciality 05.03.05 - Processes and Machines of Plastic Working. - Donbass State Engineering Academy, Kramatorsk, 2011.

This thesis is devoted to the improvement of angular pressing processes and increase of material utilization ratio. The assigned task was accomplished through the application of a simulation to workpieces in angular pressing. Equal channel plastic flow of materials through dies of varying geometry is simulated, accounting for stress-strain state features and edge effects. Punch pressure, accumulated plastic shear, dead zone geometric regularities, rational internal and external die radii in the channel intersection zone, geometric regularities of nonstationary plastic flow of an initial workpiece part and the influence of unsteady plastic flow on strain nonuniformity have been refined with the use of such numerical techniques as an upper bound approach and finite element simulation for equal channel plastic flow of metals. The influence of angular die geometry and mechanical properties of viscous materials on key energy-power parameters of the angular pressing process have been determined with a numerical finite-difference solution of the boundary value problem for the Navier-Stokes equation in the curl transfer form for the planar flow of viscous incompressible continua.

A sufficient degree of reliability of the derived mathematical models is confirmed experimentally through the use of such experimental mechanics techniques as layered models, marker techniques, and circular and rectangular grid techniques.

Engineering techniques for increasing material utilization ratio have been developed on the basis of theoretical and experimental results. This was achieved by rational selection of die tooling technological parameters, stamping punch geometry, and the introduction of additional elements between punch and workpiece.

Key words: severe plastic deformation, equal channel angular extrusion, material utilization ratio, stress-strain state, Navier-Stokes equation, mathematical simulation, physical simulation.

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