Study on the relationship between asymmetrical rolling deformation zone configuration and rolling parameters

2020 ◽  
Vol 187 ◽  
pp. 105905
Author(s):  
Ji Wang ◽  
Xianghua Liu ◽  
Xiangkun Sun
Keyword(s):  
Deformation Zone ◽  
Asymmetrical Rolling ◽  
Rolling Deformation ◽  
The Relationship

A simplified mathematical model for total temperature rise calculation in non-oriented silicon steel cold rolling deformation zone

2021 ◽  
Vol 119 (1) ◽  
pp. 104
Author(s):  
Guomin Han ◽  
Hongbo Li ◽  
Yujin Liu ◽  
Jie Zhang ◽  
Ning Kong ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Temperature Rise ◽  
Deformation Zone ◽  
Rolling Force ◽  
Silicon Steel ◽  
Initial Model ◽  
Contact Heat ◽  
Friction Heat ◽  
Total Temperature ◽  
Rolling Deformation

In tandem cold rolling, the control of the temperature of high-grade non-oriented silicon steel is a difficult problem for its large deformation resistance and the preheating procedure before rolling. And it is complicated to calculate the total temperature rise of rolling deformation zone due to the comprehensive influence of the plastic deformation heat, the friction heat and the contact heat loss. So, to precisely calculate the total temperature rise, firstly, based on the four classical cold rolling force formulas, the initial total temperature rise calculation models are established correspondingly by theoretically analyzing the temperature rise of deformation heat, the temperature rise of friction heat and the temperature drop of contact heat loss; then, the model based on the improved Lian rolling force formula is adopted, which leads to calculated best matching the measured temperature; finally, considering the complex formula calculation of the initial model, based on the influences of different rolling parameters on the total temperature rise, a simplified model for convenient calculation is proposed by the nonlinear regression analysis of the initial model calculation results and main rolling parameters, which is convenient for the actual application by the field technicians.

Effect of Stress State in Rolling Deformation Zone of AZ31 Magnesium Alloy Plate on Edge Cracking

2020 ◽  
Vol 29 (6) ◽  
pp. 3906-3912
Author(s):  
Zhiquan Huang ◽  
Chuanlu Qi ◽  
Guowei Yang ◽  
Hongyu Lai ◽  
Yanchun Zhu ◽  
...  
Keyword(s):  
Stress State ◽  
Magnesium Alloy ◽  
Deformation Zone ◽  
Az31 Magnesium Alloy ◽  
Alloy Plate ◽  
Edge Cracking ◽  
Rolling Deformation

Effects of Continuous Rolling Speed Change Rates on Geometric Dimension between Two Racks when Rolling Rail by Universal Pass

2012 ◽  
Vol 538-541 ◽  
pp. 2941-2944
Author(s):  
Yu Yan Liu ◽  
Yang Wang ◽  
Hu Zhu ◽  
Lin Chen
Keyword(s):  
Geometric Dimension ◽  
Dimensional Accuracy ◽  
Continuous Rolling ◽  
Distribution Law ◽  
Finite Element Software ◽  
Universal Mill ◽  
Speed Change ◽  
Rolling Deformation ◽  
The Relationship ◽  
Heavy Rail

This paper used the finite element software to simulate the process of the heavy rail rolling deformation between the UR and ER racks. It studied on the stress distribution law of the universal mill pass, the relationship between the universal mill unbalanced rates of velocity and tension changes of the rack, effect of the universal mill unbalanced rates of velocity on the change of the rolling geometric dimensions caused by the unbalanced rates of velocity. The research can guide the adjustment of the dimensional accuracy of the rail’s universal rolling.

The analytic study on the heavy steel plate snake rolling with the different roll diameters

2019 ◽  
Vol 116 (4) ◽  
pp. 402 ◽  
Author(s):  
Qing-cheng Meng ◽  
Lian-yun Jiang ◽  
Li-feng Ma ◽  
Jun-yi Lei
Keyword(s):  
Shear Zone ◽  
Deformation Zone ◽  
Steel Plate ◽  
Rolling Force ◽  
Slip Zone ◽  
Mechanical Parameters ◽  
Rolling Method ◽  
Rolling Torque ◽  
Inner Region ◽  
Rolling Deformation

The deformation in the inner region along the thickness of the heavy steel plate can be improved by snake rolling method. Then the microstructure and property will be refined and the crack in the inner region may be avoided. So the in-depth research on snake rolling method mechanics parameter modeling should be conducted to guide production. The rolling deformation zone will be divided into back slip zone, cross shear zone, front slip zone and reverse deflection zone according to the direction of the friction during the snake rolling process. The four zones may not exist at the same time. The boundary conditions of existence of the back slip zone, cross shear zone and front slip zone were established by calculating the position of neutral point by a special method. The calculating models which were used to calculate the snake rolling mechanical parameters including the rolling force and rolling torque were setup. The calculated models of unit compressive pressure in the four zones were setup by the slab method, and at this basis, the accurate calculating models of the rolling force and rolling torque were setup according to the composition of the rolling deformation zone and the boundary condition. The mechanical parameters were calculated by the analytic method and the numerical method, and the relative deviation is less than 5% which can satisfy the industrial requirement. The present analytical model can predict the characteristics during snake rolling easily and quickly and it is also suitable for online control applications.

Study on Minimum Rollable Thickness in Asymmetrical Rolling

2021 ◽  
Author(s):  
Ji Wang ◽  
Xianghua Liu
Keyword(s):  
Shear Zone ◽  
Deformation Zone ◽  
Rolling Force ◽  
Slip Zone ◽  
Speed Ratio ◽  
Slab Method ◽  
Roll Speed ◽  
Asymmetrical Rolling ◽  
New Model ◽  
Good Agreement

Abstract A new model for the asymmetrical rolling is proposed to calculate the minimum rollable thickness simply and fast by the slab method. The calculation formulas of the rolling pressure, the rolling force, the critical roll speed ratio and the critical front tension under different deformation zone configurations are proposed, and the deformation zone configuration - rolling parameters relationship diagram is given and analyzed. The results show that the minimum rollable thickness can be reached when the rolling parameters keep the deformation zone configuration as cross-shear zone + backward-slip zone (C+B) or all cross-shear zone (AC). The calculation formulas of the minimum rollable thickness and the required rolling parameters for different deformation zone configurations are proposed respectively. The calculated value is in good agreement with the experimental results.

Results for calculation of optimal delta-criteria for deformation zone shape in drawing of round solid profi le

2020 ◽  
pp. 267-277
Author(s):  
G.N. Gur'yanov
Keyword(s):  
Rational Choice ◽  
Deformation Zone ◽  
Strain State ◽  
Hardening Model ◽  
Deformation Parameters ◽  
Coeffi Cients ◽  
Drawing Angle ◽  
The Relationship

Formulas for calculating of the optimal delta-criterion are proposed, which, in contrast to the two similar formulas of foreign researchers considered, take into account the back-pull stress and the hardening model. The optimal delta-criterion depends on the deformation parameters and the hardening model. Approximate equalities are proposed that refl ect the relationship between the criteria of the deformation zone and the indicators of the strain state. The values of the criteria for the deformation zone and the strain state for the drawing angles is 4 and 9° and the optimal drawing angle are given. According to two formulas of foreign researchers and the proposed formula, dependencies for the optimal delta-criterion on the drawing and friction coeffi cients are constructed. The criteria values for these formulas do not differ signifi cantly. Taking into account the nature of the relationship for the criteria of the deformation zone shape and the strain state contributes to rational choice of drawing modes.

Study on Rolling Deformation Zone Feature of Corrugated Waist Rail

2010 ◽  
Vol 146-147 ◽  
pp. 709-712
Author(s):  
Jin Hong Ma ◽  
Wei Chen ◽  
Wen Zhi Zhang ◽  
Biao Wu
Keyword(s):  
Deformation Zone ◽  
Rolling Deformation

scholarly journals Microstructure Evolution and Recrystallization Temperature Change of Cold-Rolled Fe–19Mn–0.6C Twinning-Induced Plasticity Steel during Annealing

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1181
Author(s):  
Hui Xue ◽  
Hui Yuan ◽  
Kai Guo ◽  
Zhijia Zhang ◽  
Mengmeng Zhang
Keyword(s):  
Cold Rolling ◽  
Automobile Industry ◽  
Twip Steel ◽  
Cold Deformation ◽  
Recrystallization Temperature ◽  
Temperature Changes ◽  
Deformation Twins ◽  
Cold Rolled ◽  
Rolling Deformation ◽  
The Relationship

Ultra-high twinning-induced plasticity (TWIP) steel is receiving increasing attention in the automobile industry. Self-designed Fe–19Mn–0.6C TWIP steel was subjected to reveal the relationship between microstructures, which were related to recrystallization starting/ending temperature and cold rolling. The results indicated that initial deformation twins, secondary deformation twins, and nano-twins were successively generated in rolled TWIP steel with the increase of cold rolling, deformation twins, and dislocations, as well as with the elongation of grains. The elements remained uniformly dispersed rather than agglomerated in the twin crystals and grain boundaries. The recrystallization starting temperature changes of TWIP steel were 500–525, 400–425, 400–415, and 400–410 °C at cold rolling deformations of 25%, 50%, 75%, and 88%, respectively. Furthermore, the obtained corresponding recrystallization ending temperature changes were 580–600, 530–550, 520–540, and 500–520 °C, respectively. The linear relationship between cold deformation and hardness suggests that cold rolling can increase dislocation density and thus facilitate improving the hardness of TWIP steel.

A microstructural and fabric study of the Galway Granite, Connemara, western Ireland

2005 ◽  
Vol 142 (1) ◽  
pp. 81-95 ◽  
Author(s):  
S. BAXTER ◽  
N. T. GRAHAM ◽  
M. FEELY ◽  
R. J. REAVY ◽  
J. F. DEWEY
Keyword(s):  
Deformation Zone ◽  
Axial Deformation ◽  
Microstructural Investigation ◽  
The North ◽  
Strain Pattern ◽  
Instantaneous Strain ◽  
Granite Batholith ◽  
Western Ireland ◽  
The Relationship ◽  
Marginal Deformation

A detailed field and microstructural investigation of mineral fabrics in the late-Caledonian Galway Granite Batholith (∼400 Ma) provides insights into the relationship between emplacement-related deformation and crystallization state. These relationships are used to infer the regional instantaneous strain pattern at the time of intrusion. A Marginal Deformation Zone occurs in the granite along part of its northern sector, where planar fabrics are contact-parallel and dip steeply to the north. Within the Marginal Deformation Zone, the granite has similar patterns of pre- and post-RCMP (Rheologically Critical Melt Percentage) fabrics on either side of the NNE-trending Shannawona Fault Zone, which separates the Western and Central blocks of the batholith. Oblate pre-RCMP fabrics, which intensify towards the contact, are overprinted in a down-temperature continuum of deformation by co-axial post-RCMP fabrics that also become more intense towards the contact. At the southern edge of the Marginal Deformation Zone, deformation ceased before the granite reached its RCMP whereas, close to the contact, deformation ceased at ∼500°C. Within the Central Block, oblate fabrics also developed parallel with internal granite facies boundaries. Throughout the batholith, the fabrics formed by co-axial deformation as a result of lateral expansion operating in successive magma batches at the emplacement level. These intrusion-related fabrics are consistent with other evidence that indicates the Galway Granite was emplaced into a transtensional setting at the end of the Caledonian Orogeny.

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