Influence of the Cross-Sectional Shape of Hot Semifinished Rolled Products on the Formation of the Plot of Specific Tension in Cold-Rolled Strips

Shkarin, A. N.; Bel’skii, S. M.; Pimenov, V. A.

doi:10.1007/s11015-020-01046-0

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…Flatness denoted as I is the relative extension difference between the center ribbon and edge ribbon, and the unit is IU. The expressions have been derived according to literature [26], and are shown in Equation (1) and Equation (2). L(y) and l(y) denote the length of the ribbon at the entry and at the exit of stand, respectively.…”

Section: Flatness Calculation Modelmentioning

confidence: 99%

“…Crown beyond an allowable range and poor flatness reduce the product value and adversely affect subsequent processing [1]. Flatness defects that may occur between the two stands have a detrimental effect on the stability of rolling and may even cause serious accidents such as breaking and piling-up of the steel strip during hot tandem rolling [2,3]. Affected by the roll deformation caused by the rolling force, the roll thermal contour, the roll wear contour and the strip entry crown, the crown of the strip often cannot reach the target value at the exit of the stand [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on Metal Transverse Flow Law and Model of Rolled Strip under Variable Specification in Hot Rolling

Chai,

Li,

Shang

2023

Metals

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The research on metal transverse flow under variable specification is of great significance for shape calculation and control in hot strip rolling. The finite element software ABAQUS 2016 is used to establish the elastic–plastic deformation model of a hot rolled strip to study the metal transverse flow. The edge transverse strain εe and center transverse strain εc are introduced to characterize metal transverse flow and calculate the strip flatness. The effect on εe, εc and the flatness increment of similarity of profile under different widths, thicknesses and reduction rates is simulated and calculated. The results show that the change in similarity of profile has a linear influence on εe and εc. The strip has the ability of flatness self-correction due to the metal transverse flow. The ksc of the strip with B = 700 mm is 0.87, which is significantly greater than the 0.45 ksc value of the strip with B = 2100 mm. Priority can be given to ensure the crown requirements during narrow strip rolling. The ksc of the strip with H = 50 mm is 0.45, which is higher than the 0.22 ksc value of the strip with H = 6 mm, and the ksc of the strip with ε = 50% is 0.52, which is higher than 0.30 ksc value of the strip with ε = 10%. It is more reasonable to adjust the crown to a greater extent in the upstream stand to meet the requirement of both flatness and crown for the large entry thickness reduction rate and self-correction ability. A metal transverse flow prediction model based on the full test simulation results is established, which can meet the requirement of crown setting at the exit of each stand and the rapid calculation of online flatness control, and can further make the crown and flatness reach the target values at the finishing exit.

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Section: Flatness Calculation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study on Metal Transverse Flow Law and Model of Rolled Strip under Variable Specification in Hot Rolling

Chai,

Li,

Shang

2023

Metals

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“…Further, after excluding the linear component and in accordance with the Walter−Shewhart procedure [26,27], we calculate the short-term standard deviation, the lower and upper bounds: The control chart for the first derivative is shown in Fig. 3.…”

Section: Materials Science Forum Vol 1052mentioning

confidence: 99%

“…The second stage is an iterative search for the "zero level". Using the least squares method, we find a parabolic approximation of the filtered thickness values and calculate a 95 % predictive interval [26][27].…”

Section: Materials Science and Metallurgical Technology IIImentioning

confidence: 99%

“…The most critical defect of hot-rolled steel strips for cold rolling is local thickening [15][16][17][18][19][20][21]. This defect cannot be eliminated and it is very difficult to compensate during further cold rolling: if the local thickening is in the middle part of the hot rolled blank, then it can roll out into the flatness defect "local buckling"; if the thickening is near the edge, then it can roll out into a "frequent edge waviness" [22][23][24][25][26]. The appearance of flatness defects during cold rolling of hot-rolled blanks with local thickenings depends on the height and width of these thickenings, which should not exceed the limit values established in the technological instructions [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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Local Thickenings and Thinnings of Hot Rolled Strips

Belskiy

Shopin

2022

MSF

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The cross-section profile of the rolled strip is characterized by geometrical parameters such as wedge, convex, difference of thickness, edge wedge and others. Techniques for calculating the values of these parameters are known and generally accepted. However, there are features of the cross-section profile of rolled strips, such as local thickenings/thinnings, the methods of calculating values of which are not common: practically every scientific school of specialists of rolling production use their own techniques, which often produce different results for the same cross-section profiles. The problem of identifying and calculating the local thickenings/thinnings parameters of the rolled strips cross-section profile is to define a so-called “zero level”, the excess/understatement of which is a sign of local thickenings/thinnings. The paper analyzes the accuracy and adequacy of the calculation of the cross-section profile parameters of rolled strips for local thickenings/thinnings. A new method based on statistical methods is proposed. The target function that the thickness distribution across the width of the rolled strip must correspond to is a symmetrical quadratic parabola. However, the actual distribution is always different from the target one for a number of reasons, such as ring wear of the work rolls. In the first step, in the proposed technique, the Walter-Shewhart procedure (control cards) eliminates as emissions of strip thickness values that are dramatically different from the target distribution. But since without excluding the nonlinear (parabolic) component of the measured cross-section profile this procedure cannot be applied, it applies to the first derivative of the cross-section profile thickness distribution function. The result of the developed method is a “zero level” according to which the local thickening/thinning parameters are calculated.

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Development of a Method for the Evaluation of the Gap in the Course of Straightening of Sheet Products on Roller Leveling Machines

Максимов¹,

Shatalov

Ustinovsky³

2021

Metallurgist

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Influence of the Cross-Sectional Shape of Hot Semifinished Rolled Products on the Formation of the Plot of Specific Tension in Cold-Rolled Strips

Cited by 4 publications

References 8 publications

Numerical Study on Metal Transverse Flow Law and Model of Rolled Strip under Variable Specification in Hot Rolling

Numerical Study on Metal Transverse Flow Law and Model of Rolled Strip under Variable Specification in Hot Rolling

Local Thickenings and Thinnings of Hot Rolled Strips

Development of a Method for the Evaluation of the Gap in the Course of Straightening of Sheet Products on Roller Leveling Machines

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