Abstract
This paper examines the quality of trimming the edges of bimetal strips got by cold rolling. By producing the hard–soft–hard layered metal compositions, a low quality of cutting-up of clad strip edges is often observed. The trimming quality depends on the ratio of thickness of bimetal layers and their mechanical properties. The bimetals studied were composed of annealed strips of aluminium alloys A5 and AMg2 (thickness 1.0 mm, width 25 mm) as a base and brass L90, nickel silver MNTs 15-20 and steel 08kp as a cladding layer. The thickness of the cladding layer was from 7 to 35 % of the thickness of aluminium strip, with the width being equal to 50 mm. The ratio of tensile strength of the plating and the base varied in a wide range from 0.98 to 6.85. The experiments showed that trimming worsens as the ratio increases. The mathematical relation was obtained that gives the limit ratio of component thickness depending on the ratio of tensile strengths of the cladding material and the base providing high quality of edge cutting.
Highlights
Разработку технологии плакирования лент холодной прокаткой, как правило, проводят при условии, когда плакирующая лента шире ленты основы
При этом при прокатке с разовой деформацией 55–60 % должна обеспечиваться качественная обрезка кромками ленты основы кромок плакирующей ленты
This paper examines the quality of trimming the edges of bimetal strips got by cold rolling
Summary
Исследование проводилось на опытном стане Дуо-200 ЮУрГУ, имеющем диаметры рабочих валков 180 мм. Отношение пределов прочности плакирующих лент (σв пл) и основы (σв ос) равно 0,98–6,85, т. 2, из которого видно, что с увеличением прочности плакирующих лент по сравнению с прочностными характеристиками основы обрезка кромок ухудшается. Например, для композиции АМг2 – Л90 (σв пл/σв ос = 0,98) критическое отношение толщин плакирующей ленты и основы, при которой отсутствует обрезка, наблюдалась при отношении толщин 35 %. Получена регрессионная формула для выбора предельного соотношения толщин компонентов в зависимости от соотношения пределов прочности плакирующих материалов и основы, при которых обеспечивается качественная обрезка кромок The trimming quality depends on the ratio of thickness of bimetal layers and their mechanical properties. The mathematical relation was obtained that gives the limit ratio of component thickness depending on the ratio of tensile strengths of the cladding material and the base providing high quality of edge cutting.
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