Abstract
The peculiarity of cross-wedge rolling with one tool is the workpiece deformation with one tool and the fact that the workpiece is not supported with the tool from the opposite side. On both sides of the tool outside the contact with the workpiece, the workpiece is fixed with pairs of upper and lower tools, by means of which the axis of the workpiece is held in a constant position. Such conditions of rolling qualitatively change the deformation zone and, as a result, the stress-strain state.The change in the stress-strain state was qualitatively estimated by comparing the fields of slip lines in the traditional two-tools cross rolling and one-tool cross rolling. One-tool cross rolling increases the normal and average stress at the contact by 7.8–14.5 %, changes the average stress of the specimen from tensile to compressive one in the axial region. This circumstance significantly increases the resource of plasticity and allows rolling metals with limited plasticity without opening the axial cavity. Comparative studies of the stress-strain state from the traditional two-tools cross-wedge rolling and one-tool cross-wedge rolling in the axial region of the workpiece have been carried out by computer simulation.
Highlights
The change in the stress-strain state was qualitatively estimated by comparing the fields of slip lines in the traditional two-tools cross rolling and one-tool cross rolling
3 J 3(Dσ ) / K при Поперечно-клиновая прокатка (ПКП) одним (1b) и двумя (2b) инструментами (δ =1,2; сталь 40Х; α = 30°; β = 5°; V = 0,3 м/с; накопленных деформаций Λ в осевой области from one-tool (1a) and two-tools (2a) cross-wedge rolling and the dependence of the parameter of the third invariant of stress deviator 3 J 3(Dσ ) / K from the one-tool (1b) and two-tools (2b) cross-wedge rolling in the axial region of the sample (δ =1.2; steel 40Х; α = 30°; β = 5°; V = 0.3 m/s; T = 1170 K)
Прокатка одним инструментом значительно (более чем в 2,7 раза) увеличивает ресурс пластичности в осевой области образца, что обеспечивает возможность прокатки сплавов ограниченной пластичности
Summary
The change in the stress-strain state was qualitatively estimated by comparing the fields of slip lines in the traditional two-tools cross rolling and one-tool cross rolling. Качественно оценить изменение напряженно-деформированного состояния возможно путем сравнения полей линий скольжения (ЛС) при традиционной поперечной прокатке (ПП) двумя инструментами или одним инструментом. Построение поля ЛС прокатки одним инструментом, как и для ПП двумя инструментами, начинаем с треугольника KLM
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