Mathematical models and flatness control of an aluminum foil rolling mill

In cold strip or foil rolling, flatness control is an integral part of modern mill. This paper introduces two typical flatness control systems, pattern recognisation flatness control system and multivariable flatness control. It is found that the latter is effective and has wider application fields. The FEM models of its core parameters, flatness actuator efficiency, are constructed. Influencing factors, such as the rolling force, bending force as well as the tilting force are discussed. Control strategies are proposed for foil rolling. The results demonstrate that the control strategies can reduce flatness error and improve flatness quality.

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Target Curve Setting Model for Automatic Flatness Control on Stand 5 of 2180 mm Tandem Cold Rolling Mill

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.665.37 ◽

2014 ◽

Vol 665 ◽

pp. 37-41 ◽

Cited By ~ 1

Author(s):

Guang Hui Yang ◽

Jian Guo Cao ◽

Jie Zhang ◽

Hong Bo Li ◽

Jie Zheng

Keyword(s):

Cold Rolling ◽

Temperature Stress ◽

Rolling Mill ◽

Cold Rolling Mill ◽

Tandem Cold Rolling ◽

Temperature Distributions ◽

Strip Shape ◽

Flatness Control ◽

Transverse Temperature ◽

Stress Compensation

Based on the theory of target curve, a method of improving flatness target curve is proposed. The transverse temperature distributions of strip are measured and described with a biquadratic expression, and the statistics method is used to analyze the temperature distributions. Finally, the additional temperature stress compensation is calculated to improve the strip shape.

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Calculating Power Parameters of Rolling Mill Based on Model of Deformation Zone with Four-Roll Passes

Machines ◽

10.3390/machines8040073 ◽

2020 ◽

Vol 8 (4) ◽

pp. 73

Author(s):

Marina N. Samodurova ◽

Olga I. Karandaeva ◽

Vadim R. Khramshin ◽

Ivan V. Liubimov

Keyword(s):

Mathematical Models ◽

Deformation Zone ◽

Rolling Mill ◽

Process Conditions ◽

Complex Deformation ◽

Multivariable Control Systems ◽

Digital Twins ◽

Mill Equipment ◽

Metal Treatment ◽

The Impact

Making “digital twins” for rolling processes and mill equipment should begin with the development of mathematical models of the deformation zone. The deformation zone of two-high flat mill rolling have been studied in detail, relevant models are available in many academic papers. However, the same cannot be said about the most complex deformation zones in stands with multi-roll gauge. Therefore, the task of their reliable mathematical description is of immediate interest. The development of mathematical models is necessary for the design of new wire mills and rolling-drawing units. The combination of rolling in stands with multi-roll gauge and drawing is a promising direction in the production of wire from difficult-to-form steels and alloys. Digital models for pressure-based metal treatment are also necessary for calculating the rolling-mill power parameters during the development of new assortments at the operating mills. The models of deformation zones present the basis for developing the multivariable control systems of process conditions of continuous mills. This research is devoted to the study of the deformation zone and the development of a procedure for calculating the power parameters of rolling in a stand with four-roll passes. The solution of these challenges is given using the example of an operating five-stand wire mill. The authors analysed the known analytical dependencies for calculating the rolling mill force and torque. A mathematical model of the deformation zone and a program for calculating the power parameters have been developed. The paper compares the results obtained from calculations based on analytical dependence and on modelling. A comparison with the experimental parameters obtained at the mill is given. The authors assess the feasibility of using the known formulas and analyse the impact of the front and rear tensions on the power parameters of rolling mill. The problem of developing an automatic tension control system for continuous mills with multi-roll groove is substantiated.

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An innovative development of a four-high foil rolling mill

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-013-5512-x ◽

2013 ◽

Vol 71 (1-4) ◽

pp. 557-563 ◽

Cited By ~ 1

Author(s):

Yeong-Maw Hwang ◽

Te-Fu Hwang ◽

Chin-Yu Lin ◽

Chien-Wen Su

Keyword(s):

Rolling Mill ◽

Innovative Development ◽

Foil Rolling

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Strengthening Effects of Single Particle with Different Mechanical Property on Ultra-Thin Rolling of AA1235 Aluminum Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.898.1332 ◽

2017 ◽

Vol 898 ◽

pp. 1332-1339

Author(s):

Cheng Wei Xia ◽

Y.Z. Zhu ◽

Ran Liu ◽

Wei Long Fan ◽

Xiao Hui Li

Keyword(s):

Mechanical Property ◽

Stress Concentration ◽

Three Dimensional ◽

Interaction Mechanism ◽

Aluminum Foil ◽

Rolling Process ◽

3D Fem ◽

Foil Rolling ◽

The Matrix ◽

Hardness Ratio

In aluminum foil rolling, the secondary particles may lead to stress concentration at the boundary between these particles and the matrix. Different types of particles would result in stress concentration at different levels. The three dimensional finite element modeling (3D-FEM) was used to simulate the effect of the particles with different hardness on mechanical properties of the matrix of AA1235 aluminum foils in its foil rolling process. The hardness ratio was used to evaluate the mechanical property of foils. It has been found that when the hardness ratio of the particle was similar to that of the matrix (R=1), the interaction mechanism of the dislocations with the particle was dislocation cutting way. When the hardness ratio of the particle to the matrix increased from 1 to 6, the interaction mechanism of the particle with the matrix changed from the dislocation cutting way to the Orowan dislocation bypass way. When the hardness ratio increased to as high as 6, dislocation interacted with the particle only by the Orowan dislocation bypass way.

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