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Analysis of the influence of kinematic and friction asymmetry on the curvature of the strip and force parameters of the rolling process

Sułek Bartosz, Krawczyk Janusz, Majewski Marcin, Ławida Natalia, Plewa Krzysztof

Tribologia

2023

nr 3

81--94

This paper presents the numerical analysis results in Simufact Forming 2016 of the asymmetric cold rolling process of S235JR steel. The research determined the effect of kinematic asymmetry, frictional asymmetry and their combination on the strip curvature, as well as the force parameters of the rolling process. During the conducted research, the aim was to determine the parameters of the asymmetric rolling process, allowing the highest possible reduction of forces (in relation to symmetric rolling) while maintaining the curvature of the strip with an acceptable value |δ|≤1.5. For this purpose, "process maps" were developed based on the obtained results, allowing for selecting the most favourable process parameters for the different rolling reductions. In addition, the results made it possible to determine the effect of the various asymmetries obtained on the process forces and strip curvature depending on the size of the rolling reduction.

W artykule przedstawiono wyniki analizy numerycznej w programie Simufact Forming 2016 procesu walcowania asymetrycznego na zimno stali S235JR. W ramach prac określono wpływ asymetrii kinematycznej, asymetrii tarcia oraz ich połączenia na krzywiznę pasma, a także parametry siłowe procesu walcowania. Podczas przeprowadzonych badań dążono do określenia parametrów procesu walcowania asymetrycznego, pozwalających na możliwie wysoką redukcję sił (w odniesieniu do walcowania symetrycznego) przy jednoczesnym zachowaniu krzywizny pasma na dopuszczalnym poziomie W tym celu opracowano na podstawie analizy uzyskanych wyników „mapy procesowe”, umożliwiające dla różnych gniotów dobór najkorzystniejszych parametrów procesu. Dodatkowo uzyskane wyniki badań pozwoliły na określenie wpływu poszczególnych asymetrii na siły procesu oraz krzywizny pasma w zależności od wielkości wprowadzonych odkształceń.

The Effect of Low Deformation Asymmetric Rolling on Microstructure and Texture of the Polycrystalline Copper

Uniwersał A., Wróbel M., Wroński S., Kalemba-Rec I., Wroński M., Wierzbanowski K., Baczmański A., Bacroix B.

Archives of Metallurgy and Materials

2016

Vol. 61, iss. 4

2183--2188

In the most recent years the asymmetric rolling (AR) attracts attention of researchers and technologists. This process can improve some technological parameters (e.g. modification of rolling torque and load, power requirements, etc.) as well as provide the possibility of grain refinement in a relatively inexpensive way. Most of the reports concerning microstructural changes produced by AR refer to high deformations imposed in highly asymmetric conditions. However, such rolling conditions are difficult to control, so there are no prospects to their quick industrial implementation. The present paper refers to relatively low deformation and low asymmetry rate, that is much more interesting for the industry. It was shown that bending of the rolled band (important disadvantage of the AR technology) can be controlled by adjusting of the amount of deformation and asymmetry. It was also shown that ca. 30% reduction in thickness during cold rolling, together with a relatively low asymmetry, reduces significantly the grain size and produces a more fragmented microstructure inside grains of the polycrystalline copper comparing to the symmetric rolling (SR). The material hardness after AR is higher than after the SR. Moreover, the crystallographic texture asymmetry, expressed by its rotation around the transverse direction, is observed in the AR material.