Исследование утонения в местах изгиба и изменение ширины исходной заготовки
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Дата
2016
ORCID
DOI
Науковий ступінь
Рівень дисертації
Шифр та назва спеціальності
Рада захисту
Установа захисту
Науковий керівник
Члени комітету
Видавець
НТУ "ХПИ"
Анотація
Установлено, что утонение, возникающее в местах изгиба тонкостенных гнутых профилей, увеличивает расчётную ширину заготовки и в ряде случаев, особенно при формовке тонкостенных профилей с элементами двойной толщины сложной конфигурации может приводить к искажению их формы. Проведены теоретические исследования величины утонения в местах изгиба гнутых профилей, получена формула для определения приращения ширины в каждом месте изгиба, которой следует пользоваться при проектировании технологии и выборе ширины заготовки при освоении новых профилей.
When the forming rolls in roll forming mill in the field of bending metal necking occurs, causing a change in bandwidth during its deformation. Therefore, if we ignore this increase in width of the workpiece, during the development of the production of new profiles situation aris es technology, when its width is larger than the estimated width of the roll caliber varying mill, which in some cases can lead to the formation of profile defects flatness its individual elements. The perspective gage of profiles of a difficult configuration with elements of double thickness is analyzed. It is set that the weight of 1 running meter of bent profiles, and, therefore, their thickness, permanently decrease. Now, in a gage there are profiles 0,5 mm thick and less. It, causes a row of the additional difficulties connected to receiving qualitative thin-walled profiles, in particular, owing to change of thickness of a preformed band from thin-sheet material, origin of nonplanarity on separate sections of profiles is possible. It is set that t hinning of sheet metall, arising up in the places of bend of the thin-walled bent types, increases the calculation width of purveyance and in a number of cases, especially at roll forming of the thin-walled types with the elements of double thickness of the complicated configuration can result in distortion of their form. Theoretical researches of size of t hinning in the places of bend of the bent types are conducted, a formula is got for determination of increase of width in every place of bend, which it is necessary to use at planning of technology and and choice of width of purveyance at mastering of new types.
When the forming rolls in roll forming mill in the field of bending metal necking occurs, causing a change in bandwidth during its deformation. Therefore, if we ignore this increase in width of the workpiece, during the development of the production of new profiles situation aris es technology, when its width is larger than the estimated width of the roll caliber varying mill, which in some cases can lead to the formation of profile defects flatness its individual elements. The perspective gage of profiles of a difficult configuration with elements of double thickness is analyzed. It is set that the weight of 1 running meter of bent profiles, and, therefore, their thickness, permanently decrease. Now, in a gage there are profiles 0,5 mm thick and less. It, causes a row of the additional difficulties connected to receiving qualitative thin-walled profiles, in particular, owing to change of thickness of a preformed band from thin-sheet material, origin of nonplanarity on separate sections of profiles is possible. It is set that t hinning of sheet metall, arising up in the places of bend of the thin-walled bent types, increases the calculation width of purveyance and in a number of cases, especially at roll forming of the thin-walled types with the elements of double thickness of the complicated configuration can result in distortion of their form. Theoretical researches of size of t hinning in the places of bend of the bent types are conducted, a formula is got for determination of increase of width in every place of bend, which it is necessary to use at planning of technology and and choice of width of purveyance at mastering of new types.
Опис
Ключові слова
гнутый профиль, место изгиба, утонение металла, ширина заготовки, приращение, крутящий момент, радиальная составляющая скорости, bent type, place of bend, thinning of metal, increase of width of purveyance, twisting a moment, radial constituent of speed
Бібліографічний опис
Тришевский О. И. Исследование утонения в местах изгиба и изменение ширины исходной заготовки / О. И. Тришевский, А. Г. Крюк, С. Ю. Плеснецов // Вісник Нац. техн. ун-ту "ХПІ" : зб. наук. пр. Сер. : Інноваційні технології та обладнання обробки матеріалів у машинобудуванні та металургії = Bulletin of National Technical University "KhPI" : coll. works. Ser. : Innovative technologies and equipment handling materials in mechanical engineering and metallurgy. – Харків : НТУ "ХПІ", 2016. – № 30 (1202). – С. 74-78.