Abstract
One of the most productive and reliable methods for studying the processes of metal forming is direct physical modeling on a real metal. The limitations of this method, as applied to the production of electric welded pipes, are generally related only to the lack of specialized equipment for modeling the continuous roll forming process. In 2014, a laboratory for modeling the most common processes of forming welded straight-seam pipes produced by continuous or discrete methods was established at the “Metal Forming” Department of NUST “MISIS”. The laboratory includes a specialized “TESA10-50TRAINER” (TRAINER), which allows simulation of continuous processes of electric welded pipes of small diameter. At the TRAINER, it is possible to simulate the processes of continuous forming of pipes of small and medium diameter by the basic production schemes of the pipe-electric welding manufactory: obtaining welded pipes of circular cross-section from strand; production of profiled pipes from sheet billet; obtaining profiled pipes from a preformed round or oval billet. In the research part of the article, the focus of deformation of the pipe blank, including the non-contact focus of the folding, the contact deformation center and the sprung portion, is considered. Initially, the shaping parameters of pipe billet in monotonous and roll forming centers were calculated by the adopted methods. The obtained results were compared by dynamics of the change in the width of billet from fixed sections of the deformation center. Further, the parameters of the roller tool were checked for compliance with the calculated dimensions. For the first roll stand of a continuous focus, an experiment was organized and conducted for the same conditions, but in a real roll center. The obtained experimental sample, marked out in eight sections, was measured after the billet had left the drive stand and the obtained data are listed in the table. Analysis of the results showed that the shape change of the cross-section parameters corresponds to the accepted provisions on geometry nature of the billet in the roller drive calibers. The discrepancy between the theoretical and experimental data for the roll center does not exceed 1.5 %.
Highlights
In 2014, a laboratory for modeling the most common processes of forming welded straight-seam pipes produced by continuous or discrete methods was established at the “Metal Forming” Department of NUST “MISIS”
At the TRAINER, it is possible to simulate the processes of continuous forming of pipes of small and medium diameter by the basic production schemes of the pipe-electric welding manufactory: obtaining welded pipes of circular cross-section from strand; production of profiled pipes from sheet billet; obtaining profiled pipes from a preformed round or oval billet
The obtained results were compared by dynamics of the change in the width of billet from fixed sections of the deformation center
Summary
67,5 135,0 202,5 270,0 мм 163,49 135,93 96,20 52,02 мм 24,79 45,40 58,60 62,78 метров поперечных сечений [1, 7 – 9]. Как показали ранее проведенные теоретические и экспериментальные исследования формовки с анализом контактного взаимодействия инструмента и валков [1, 10 – 12], такая траектория реально воспроизводима только специальным валково-роликовым инструментом формовочного оборудования и обеспечивает равномерное изменение (увеличение) деформаций и напряжений по мере формовки профиля заготовки. Параметры формовки фиксировали по зависимости изменения ширины заготовки по длине очага сворачивания по размеченным сечениям. Что ширина заготовки равномерно уменьшается до четырех-пяти контактной зоны очага деформации на 9,6 мм, затем равномерно распружинивается на 4,8 мм. 3. Параметры поперечного сечения заготовки в очаге сворачивания первой формовочной клети: Ai – расстояние между кромками заготовки для i-го сечения очага, Нi – высота профиля, Ri – радиус формовки заготовки. 4. Геометрические параметры очага сворачивания в первой клети:. Что валковый очаг имеет три характерных участка формоизменения и для каждого участка при-
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Izvestiya Visshikh Uchebnykh Zavedenii. Chernaya Metallurgiya = Izvestiya. Ferrous Metallurgy
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.