Stress-strain state during draft of wide bands with shear

Z.A. Ashkeyev, V.A. Andreyachshenko, K.A. Nogaev, Z.U. Bukanov

Author details

Z.A. Ashkeyev
Karaganda industrial university, Temirtau, Kazakhstan
V.A. Andreyachshenko
Abylkas Saginov Karaganda technical university, Karaganda, Kazakhstan
K.A. Nogaev
Karaganda industrial university, Temirtau, Kazakhstan
Z.U. Bukanov
Abylkas Saginov Karaganda technical university, Karaganda, Kazakhstan

https://doi.org/10.15593/perm.mech/2023.2.03

Forging processes are traditional methods of metalworking, their application is very extensive and allows the manufacture of metal products for various industries in a wide temperature range. The redistribution of the main acting forces during forming is a necessary condition for the transfer of traditional forging methods to high-tech methods of metal production. The main products of press-forging production are forgings such as pallets and plates. In the present work, the effect of shear forces on the stress-strain state is studied when the friction forces are redistributed on the contact surface and/or the nature of the metal flow changes during upsetting of wide strips. The analysis of the stress state was carried out by the method of slip lines compared with the existing method of settlement without shear. The field of slip lines and the hodograph of velocities for the draft of the strip with a shift are compiled. The stresses and intensity of the shear deformation were estimated by the analytical method. It was revealed that the upsetting of the strip between plane-parallel plates is accompanied by extremely uneven deformation over the section of the workpiece. The stress state is compared with traditional deformation and with superimposed shear deformation. The use of shears made it possible to realize predominantly compressive stresses, which make it possible to eliminate internal defects of the workpiece of foundry origin. The introduction of shear deformations contributes to the intensification of the plastic deformation process over the entire cross section of the strip, the stress values during draft with additional shear increase on average 4-6 times compared to normal draft. The increase in stress occurs due to the development of the intensity of shear deformation, reaching a value of 0.4 per compression.

Keywords

deformationstress stateslip linesstrain forcesevere plastic deformation.

НАПРЯЖЕННО-ДЕФОРМАЦИОННОЕ СОСТОЯНИЕ ПРИ ОСАДКЕ ШИРОКИХ ПОЛОС СО СДВИГОМ

Процессы ковки являются традиционными методами металлообработки, их применение весьма обширно и позволяет изготовлять металлоизделия для различных областей промышленности в широком диапазоне температур. Перераспределение главных действующих сил при формоизменении является необходимым условием для перевода традиционных методов ковки в высокотехнологичные способы производства металлов. Основной продукцией кузнечно-прессового производства являются поковки типа плит и пластин. В настоящей работе исследовано влияние сдвигающих сил на напряженно-деформированное состояние при перераспределении сил трения на контактной поверхности и/или изменении характера течения металла при осадке широких полос. Анализ напряженного состояния осуществлялся методом линий скольжения с сопоставлением с существующим способом осадки без сдвига. Составлены поле линий скольжения и годограф скоростей для осадки полосы со сдвигом. Аналитическим методом оценены напряжения и интенсивности деформации сдвига. Выявлено, что осадка полосы между плоскопараллельными плитами сопровождается крайне неравномерной деформацией по сечению заготовки. Выполнено сравнение напряженного состояния при традиционном деформировании и с наложением сдвиговой деформации. Применение сдвигов позволило реализовать преимущественно сжимающие напряжения, которые позволяют устранять внутренних дефекты заготовки литейного происхождения. Введение сдвиговых деформаций способствует интенсификации процесса пластической деформации по всему сечению полосы, величины напряжения при осадке с дополнительным сдвигом увеличиваются в среднем в 4–6 раз при сравнении с обычной осадкой. Увеличение напряжения происходит за счет развития интенсивности деформации сдвига, достигающее величины 0,4 за одно обжатие.

Ключевые слова

деформациянапряженное состояниелинии скольженияусилие деформацииинтенсивная пластическая деформация.

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Article information

Published: 23 June 2023
Issue date: 23 June 2023
Issue: No. 2 (2023)