Modelling and simulation of deformation zone in cross rolling mill

1997 ◽  
Vol 68 (5) ◽  
pp. 220-223
Author(s):  
Li Zhiqiang ◽  
Lu Yuqiu ◽  
Lu Shouli
Keyword(s):  
Deformation Zone ◽  
Rolling Mill ◽  
Modelling And Simulation ◽  
Cross Rolling

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

Machines ◽  
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.

Effects of Cross-Rolling on Deformation Texture Evolution in Unalloyed Titanium

2016 ◽  
Vol 879 ◽  
pp. 2014-2019
Author(s):  
Osamu Umezawa ◽  
Norimitsu Koga
Keyword(s):  
Rolling Mill ◽  
Transverse Direction ◽  
Texture Evolution ◽  
True Strain ◽  
Rolling Direction ◽  
Deformation Texture ◽  
Fiber Texture ◽  
Cross Rolling ◽  
Flat Rolling ◽  
The Cross

Unalloyed titanium was rolled with 20% reduction in each pass at 293 K using a cross rolling mill, where the upper and lower rolling axes were skewed each other at an angle of 0, 5 or 10 degree with parallel position. Multi-pass flat-rolling was carried out without any lubricants up to the true strain of 1, where two kinds of rolling directions such as tandem (uni-direction for all passes) and reverse (opposite direction in every passes) were adopted. The strain of specimens was increased proportionally as higher passes regardless of the rolling conditions. The transverse direction (TD) split deformation texture in titanium was generally developed under the cross angle of 0 degree. In the present strips of tandem, a main orientation was identified as (-12-18)[10-10]. In the case of tandem with the cross angle of 5 degree, a fiber texture was developed along (-12-18). That is the reason why a rotation in the rolling direction (RD) was overlapped. In the case of reverse with the cross angle of 5 degree, the main orientation was separated into [10-10] and [2-311] that were corresponded to TD and RD splits, respectively.

Development of a method and equipment for testing materials for alternating bending during piercing in screw rolling mills

2020 ◽  
pp. 29-34
Author(s):  
B. A. Romantsev ◽  
◽  
A. S. Aleshchenko ◽  
E. R. Guseynov ◽  
V. Yu. Tsyutsyura ◽  
...  
Keyword(s):  
Deformation Zone ◽  
Rolling Mill ◽  
Pipe Production ◽  
Test Machine ◽  
Shell Wall ◽  
Original Design ◽  
Plastic Bending ◽  
Deformed State ◽  
Hot Rolled ◽  
Alternating Bending

Hot-rolled pipe production is complicated process of metal treatment by pressure and as a rule it has three operations of form charging: piercing, plugging, calibration or reduction. Each of them is characterized by complex schemes of stress-deformed state which promotes either formation or detection of various defects. Hot billet piercing at screw piercing rolling mill is widely used for pipe production for its high output and getting the shells of long length. But this operation of form charging of the metal is realized under the conditions of complicated stress-deformed state with cyclic alternating bending of all metal layers. Defects appearing on the outside surface of the shell such as captures and cracks is caused by plastic bending of shell wall, which is followed by alternating stress and deformation at the inlet and outlet cone of deformation zone in consequence of four times plastic bending of the wall. Shell wall is influenced by compression stress of the working rolls and guides. The less favorable scheme of stress state with tensile stress arises on the shell surface between the rolls and the guide. And as a results it generates and increases the defects on the outside surface. Theoretical and experimental research of deformation and speed conditions of billet piercing process for screw piercing rolling mill is presented in the work. Statistic data of production mills which operate in TRA 50-200 and TRA 159-426 lines were used for the research. All the calculations were done with use of applied software and test machine of original design with crank and connecting rod mechanism was constructed. The machine carries out the process of alternating plastic bending which is in maximum close to the conditions taking place in deformation zone of screw piercing rolling mill. Definition of rational configuration of sample shape was determined. Process plasticity of the metal of hot samples was analyzed as well. The samples were made from hot-rolled bars of different steel grades.

Structure Design and Optimization of the Metal Spoon Cross Rolling Mills

2013 ◽  
Vol 842 ◽  
pp. 629-633
Author(s):  
Ze Min Liu ◽  
Li Fu
Keyword(s):  
Rolling Mill ◽  
Structure Optimization ◽  
Structure Design ◽  
Conveyer Belt ◽  
Parameter Adjustment ◽  
Rolling Mills ◽  
Manual Operation ◽  
Cross Rolling ◽  
Design And Optimization

We used to adopt the manual operation on the closed cross rolling mills to produce metal spoons in the traditional ways which is inefficient and hard to handle. The open cross rolling mill developed in this paper enables automation coordinating with the conveyer belt. Productivity can rise through rack structure optimization and parameter adjustment. Compared with the traditional manual operation, the open cross rolling mill is safer, more efficient and more convenient to handle.

Calculation of Rolling Force of 3700mm Cylindrical Shell Rolling Mill

2012 ◽  
Vol 572 ◽  
pp. 19-24
Author(s):  
Su Wen Chen ◽  
Hong Min Liu ◽  
Yan Peng ◽  
Jian Liang Sun ◽  
Bin Bin Sun
Keyword(s):  
Cylindrical Shell ◽  
Deformation Zone ◽  
Rolling Mill ◽  
Rolling Force ◽  
Metal Flow ◽  
Force Model ◽  
Equilibrium Equations ◽  
Stress Equilibrium ◽  
Slip Area ◽  
Good Agreement

Rolling force is an important technological parameter in designing of the 3700mm cylindrical shell rolling mill. Due to the characteristics of double driving rolls and asynchronous rolling of 3700 mm cylindrical shell rolling mill, the force analysis of the deformation zone is complex. In this study, an analytic method was used to calculate the rolling force. The deformation zone was divided into the forward slip area, the backward slip area and the rub rolling area on the basis of metal flow velocity. The stress equilibrium equations of each area were built. Then the rolling force model of the 3700mm cylindrical shell rolling mill was built and solved, according to the boundary conditions. At the same time, in order to verify the validity of the analysis, the calculated values were compared with the measured in the spot. They have a good agreement, which indicates the calculation accuracy of the model could meet the industry requirements.

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