Reducing pressure on the rolls and tension in the asymmetric cold-rolling of strip

Максимов, Е. А.

doi:10.1007/s11015-011-9370-1

Cited by 9 publications

(5 citation statements)

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“…This observation tells us that there is a possibility for the asymmetrical deformation of the gold wire to occur. Asymmetric rolling is used to deliver enough sheer strain to the whole volume of the object and reduce the pressure during rolling, however it can also cause an asymmetric texture distribution since the texture evolution in the cold drawn wire is highly related to the sheer deformation [24,25].…”

Section: Resultsmentioning

confidence: 99%

Relationship between microstructure homogeneity and bonding stability of ultrafine gold wire

et al. 2011

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Inhomogeneous microtexture evolution during the cold drawing process usually results in lean, sway, or sweep failure. The <111> longitudinal fiber texture has higher stiffness than the <100> texture and its proportion and distribution in the cross-section are critical for the bonding stability of fine gold wire. We investigated the inhomogeneous microtexture evolution of gold wire that was cold drawn through an asymmetric diamond die. In this study, the distributions of the <111> and <100> textures in a 20 μm diameter fine gold wire are the variables and their effects on the bonding stability of the wire were estimated by electron backscattered diffraction (EBSD) and finite element method (FEM) simulations. The use of a focused ion beam apparatus enabled a high quality of band contrast of the EBSD to be achieved in the exact half cross-sectional area of the fine gold wire. The detailed three-dimensional FEM results show that the asymmetric distribution of the textures plays a crucial role in increasing the spatial displacement of the gold bonding wire.

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Section: Resultsmentioning

confidence: 99%

Relationship between microstructure homogeneity and bonding stability of ultrafine gold wire

et al. 2011

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“…Some scholars have also studied the influencing mechanism of rolling force on lubrication friction and tension factors. Maksimov et al [8] proposed a connection between rolling force and tension variation, and analyzed the interpretation of the thinning amount and strain hardening, unit friction force, circumferential speed of the work roll, tension, and rolling force. Zhao et al [9] discussed the area where the friction force in the opposite direction is formed in the rolling process, determined that the changes in the circumferential speed of the work roll, the tension at the end of the rolled piece, and other rolling parameters are related to the length of the area, and gave the functional form of the length coefficient of the area, thus improving the influencing factors of the rolling force model.…”

Section: Introductionmentioning

confidence: 99%

Establishment and Numerical Analysis of Rolling Force Model Based on Dynamic Roll Gap

Tao

Wang

2023

Applied Sciences

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Applying mathematical models and numerical methods is crucial for describing and simulating the metal cold-rolling process, wherein the accurate prediction of rolling force is an effective way to improve the quality of rolled sheets. This paper considers key influencing parameters such as friction lubrication, stress, tension, and roll-flattening radius during the rolling process and establishes a calculation model for the friction coefficient and roll-flattening radius. By considering the coupling effect of the dynamic roll gap on rolling force, a rolling force model for non-steady-state friction lubrication during the rolling process is obtained. The correctness of the proposed model is verified by comparing it with industrial measurement results. The influences of the friction coefficient, stress, tension before and after rolling, and roll-flattening radius on rolling force are quantitatively studied. The results show that the rolling force increases with an increase in the friction coefficient. When the friction coefficient exceeds 0.2, the rate of increase slows down, approaching dry friction conditions. The rolling force increases linearly with stress but decreases with increasing tension before and after rolling. The rolling force model, considering the roll-flattening radius, provides numerical calculation results that are closer to an industrial measured rolling force. This work contributes to a better understanding of the mechanism behind the improvement of the cold rolling process.

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“…The low asymmetry AR can be easier controlled by only a modest modification of typical rolling mills. However, the attention of technologists is often oriented towards technological parameters [20][21][22][23][24][25][26] but the microstructure effects are neglected. Also, the modification of residual stresses induced by an improved processing technology should be considered [27,28].…”

Section: Introductionmentioning

confidence: 99%

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

Uniwersał

Wróbel

Wroński

et al. 2016

Archives of Metallurgy and Materials

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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.

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Reducing pressure on the rolls and tension in the asymmetric cold-rolling of strip

Cited by 9 publications

References 0 publications

Relationship between microstructure homogeneity and bonding stability of ultrafine gold wire

Relationship between microstructure homogeneity and bonding stability of ultrafine gold wire

Establishment and Numerical Analysis of Rolling Force Model Based on Dynamic Roll Gap

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

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