Prediction and analysis of rolling process temperature field for silicon steel in tandem cold rolling

Twinning behaviors in grains during cold rolling have been systematically studied in preparing ultra-thin grain-oriented silicon steel (UTGO) using a commercial glassless grain-oriented silicon steel as raw material. It is found that the twinning system with the maximum Schmid factor and shear mechanical work would be activated. The area fraction of twins increased with the cold rolling reduction. The orientations of twins mainly appeared to be α-fiber (<110>//RD), most of which were {001}<110> orientation. Analysis via combining deformation orientation simulation and twinning orientation calculation suggested that {001}<110> oriented twinning occurred at 40–50% rolling reduction. The simulation also confirmed more {100} <011> oriented twins would be produced in the cold rolling process and their orientation also showed less deviation from ideal {001}<110> orientation when a raw material with a higher content of exact Goss oriented grains was used.

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Analysis for the Propagation of Edge Crack of Silicon Steel during Cold Rolling Process Based on GTN Damage Model

Journal of Mechanical Engineering ◽

10.3901/jme.2012.10.033 ◽

2012 ◽

Vol 48 (10) ◽

pp. 33 ◽

Cited By ~ 1

Author(s):

Yuxi YAN

Keyword(s):

Cold Rolling ◽

Edge Crack ◽

Damage Model ◽

Rolling Process ◽

Silicon Steel ◽

Gtn Damage Model

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Silicon Steel Strip Profile Control Technology for Six-High Cold Rolling Mill with Small Work Roll Radius

Metals ◽

10.3390/met10030401 ◽

2020 ◽

Vol 10 (3) ◽

pp. 401

Author(s):

Hainan He ◽

Jian Shao ◽

Xiaochen Wang ◽

Quan Yang ◽

Xiawei Feng

Keyword(s):

Cold Rolling ◽

Rolling Mill ◽

Steel Strip ◽

Work Roll ◽

Rolling Process ◽

Silicon Steel ◽

Cold Rolling Mill ◽

Strip Profile ◽

Profile Control ◽

Small Work

Due to the requirement of magnetic properties of silicon steel sheets, producing high-precision size strips is the main aim of the cold rolling industry. The tapered work roll shifting technique of the six-high cold rolling mill is effective in reducing the difference in transverse thickness of the strip edge, but the effective area is limited, especially for a high crown strip after the hot rolling process. The six-high mill with a small work roll size can produce a strip with higher strength and lower thickness under a smaller rolling load. At the same time, the profile of the strip can be substantially improved. By advancing a well-established analytical method, a series of simulation analyses are conducted to reveal the effectiveness of a small work roll radius for the strip profile in the six-high cold rolling process. Through the analysis of flattening deformation and deflection deformation on the load, the change rule of the strip profile produced by the work roll with a small roll diameter can be obtained. Combined with theoretical analysis and industrial experiments, it can be found that the improvement effect of the small work roll radius on the profile of the silicon strip is as significant.

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Analysis for the Propagation of Edge Crack of Silicon Steel during Cold Rolling Process Based on GTN Damage Model

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.482-484.487 ◽

2012 ◽

Vol 482-484 ◽

pp. 487-492

Author(s):

Yu Xi Yan ◽

Quan Sun ◽

Jian Jun Chen ◽

Hong Liang Pan

Keyword(s):

Cold Rolling ◽

Edge Crack ◽

Damage Model ◽

Rolling Process ◽

Silicon Steel ◽

Damage Distribution ◽

Initiation And Propagation ◽

Gtn Damage Model ◽

Edge Cracks ◽

Good Agreement

Silicon steels tend to develop edge cracks during cold rolling, which need to be removed and cause rupture of the steel in the rolling mill. Hence, it is necessary to understand the formation of edge cracks. The damage distribution and the initiation and propagation of edge cracks occur around the notch tip during cold rolling process was investigated by using GTN damage model. The damage parameters f0, fcand fFare determined by tension experiments and SEM observation. The influence of various rolling parameters on damage distribution and crack length was simulated by using ABAQUS. The numerical results show that the GTN damage model is available to prediction the initiation and propagation of edge cracks during rolling process. Parametric study carried out in this present work reveals that the possible occurrence of edge cracks is higher at larger reduction, higher friction coefficient, smaller roll radius and stronger unit tension. The simulation and experimental results have a good agreement .

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Survival of Goss Grains during Cold Rolling of a Silicon Steel Single Crystal

Materials Science Forum ◽

10.4028/www.scientific.net/msf.495-497.1061 ◽

2005 ◽

Vol 495-497 ◽

pp. 1061-1066 ◽

Cited By ~ 7

Author(s):

Dorothée Dorner ◽

Ludger Lahn ◽

Stefan Zaefferer

Keyword(s):

Cold Rolling ◽

Single Crystal ◽

High Strain ◽

Shear Bands ◽

Rolling Process ◽

Silicon Steel ◽

Oriented Crystal ◽

Cold Rolled ◽

Goss Orientation ◽

Crystal Volume

A silicon steel single crystal with initial Goss orientation, i.e. the {110}<001> orientation, was cold rolled up to 89 % thickness reduction. Most of the crystal volume rotates into the two symmetrical equivalent {111}<112> orientations. However, a weak Goss component is still present after high strain, although the Goss orientation is mechanically instable under plane strain loading. Two types of Goss-oriented crystal volumes are found in the highly deformed material. We suggest that their origin is different. The Goss-oriented regions that are observed within shear bands form during the cold rolling process. In contrast, those Goss-oriented crystal volumes that are found inside of microbands survive the cold rolling.

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Texture Evolution in Non-Oriented Silicon Steel Processed by Twin-Roll Casting

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.452-453.7 ◽

2012 ◽

Vol 452-453 ◽

pp. 7-11 ◽

Cited By ~ 1

Author(s):

Wei Pei ◽

Yu Hui Sha ◽

Fang Zhang ◽

Liang Zuo

Keyword(s):

Cold Rolling ◽

Texture Evolution ◽

Casting Process ◽

Rolling Process ◽

Silicon Steel ◽

Recrystallization Annealing ◽

Twin Roll Casting ◽

Steel Sheets ◽

Roll Casting ◽

Twin Roll

In this paper, non-silicon steel sheets were produced by both twin-roll casting method and conventional process. Orientation characteristics and texture evolution of the sheets during casting, cold rolling and recrystallization annealing were investigated for comparison. It was found that the subsurface of twin-roll casting strips are characterized by weak {100} orientation while the central layer by random orientation. Twin-roll casting process can decrease α fiber (//RD) and increase γ fiber (//ND) during cold rolling process. Consequently, the η fiber (//RD) favorable for magnetic properties of non-silicon steels is enhanced and the detrimental {111} component is suppressed after annealing.

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Investigation and Optimization of Load Distribution for Tandem Cold Steel Strip Rolling Process

Metals ◽

10.3390/met10050677 ◽

2020 ◽

Vol 10 (5) ◽

pp. 677 ◽

Cited By ~ 1

Author(s):

Xin Jin ◽

Changsheng Li ◽

Yu Wang ◽

Xiaogang Li ◽

Yongguang Xiang ◽

...

Keyword(s):

Genetic Algorithm ◽

Cold Rolling ◽

Prediction Model ◽

Load Distribution ◽

Rolling Mill ◽

Fitness Function ◽

Steel Strip ◽

Rolling Process ◽

Cold Rolling Mill ◽

Tandem Cold Rolling

In order to improve the cold rolled steel strip flatness, the load distribution of the tandem cold rolling process is subject to investigation and optimization. The strip deformation resistance model is corrected by an artificial neural network that is trained with the actual measured data of 4500 strip coils. Based on the model, a flatness prediction model of strip steel is established in a five-stand tandem cold rolling mill, and the precision of the flatness prediction model is verified by rolling experiment data. To analyze the effect of load distribution on flatness, the flatness of stand 4 is calculated to be 7.4 IU, 10.6 IU, and 16.8 IU under three typical load distribution modes. A genetic algorithm based on the excellent flatness is proposed to optimize the load distribution further. In the genetic algorithm, the classification of flatness of stand 4 calculated by the developed flatness prediction model is taken as the fitness function, with the optimal reduction of 28.6%, 34.6%, 27.3%, and 18.6% proposed for stands 1, 2, 3, and 4, respectively. The optimal solution is applied to a 1740 mm tandem cold rolling mill, which reduce the flatness classification from 10.8 IU to 3.2 IU for a 1-mm thick steel strip.

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