Journal articles: 'Rolling mill rolls'

1

Peng, Rongrong, Xingzhong Zhang, and Peiming Shi. "Coupled Vibration Behavior of Hot Rolling Mill Rolls under Multinonlinear Effects." Shock and Vibration 2020 (June 10, 2020): 1–14. http://dx.doi.org/10.1155/2020/6104028.

Full text

Abstract:

A coupled vibration model of hot rolling mill rolls under multiple nonlinear effects is established by considering the nonlinear spring force produced by the hydraulic cylinder, the nonlinear friction between the work rolls, the dynamic variation of rolling force, and the effect of external excitation as well as according to the structural constraints of a four-high hot rolling mill in the vertical and horizontal directions. The amplitude-frequency response equation of rolling mill rolls is determined by using a multiple-scale approximation method. Furthermore, use of actual data for simulation indicates that the internal resonance is the main cause of coupling vibration of the rolling mill rolls. In addition, changes in the movement displacement of the hydraulic cylinder and the coupling parameters strongly affect the coupling system of the rolling mill rolls. Finally, the study of the dynamic bifurcation characteristics of the rolling mill rolls indicates that, with varying external excitation amplitude, the vibration of rolls alternates between periodic motion, period-doubling motion, and chaotic motion in both vertical and horizontal directions. This is one of the reasons for the appearance of periodic light and dark stripes on the strip surface. Furthermore, the range of the external excitation amplitude (F0) at which the rolling mill roll system vibrates violently, that is, 5.68e5 N < F0 < 5.84e5 N and F0 > 6.12e5 N, must be avoided. The research results can provide a theoretical reference for further exploration of the coupling vibration mechanism of hot rolling mills.

APA, Harvard, Vancouver, ISO, and other styles

2

Liu, Peng, Hong Bo Li, and Zhi Qian Shen. "Technical Characteristics and Application for a New Type of 8-Roll Cold Rolling Mill." Advanced Materials Research 572 (October 2012): 55–60. http://dx.doi.org/10.4028/www.scientific.net/amr.572.55.

Full text

Abstract:

This paper focuses on a new type of 8-roll cold rolling mill with the back-up bearing roll. Compared to the traditional 6-roll cold rolling mill, a thick-walled bearing roll is used to multi-support the intermediate roll. By the rack, the fan-shaped gears, the eccentric core shaft and the servo-cylinder, the work roll can be pushed down by this screw down device on the top of the mill; By contrast with the 4(6)-roll mill, this type of mill has some characteristics, such as: the small size of rolls, lighter weight, the fast response for the screw down. The bearing roll is fixed by the supporting blocks placed on the rolling-mill housing. So this mill has large traverse rigidity, and this is propitious to the flatness control. By different means of strip flatness adjustments, such as the intermediate roll shifting, the roll bending and the bearing roll adjusting, the strip flatness can be well controlled. The oil-gas lubrication is used in the bearings of the bearing rolls, and the changing rolls equipment is designed for this type of mill too. A series of this type of mills (as 450, 800, 1250, 1450 series) have been produced since it was developed in 1997. The mills for 1250 and 1450 series have been applied in five-stand cold rolling mill and single stand reversing mill, a rolling speed of 800m/min has been achieved.

APA, Harvard, Vancouver, ISO, and other styles

3

Brusa, E., L. Lemma, and D. Benasciutti. "Vibration analysis of a Sendzimir cold rolling mill and bearing fault detection." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 8 (December 9, 2009): 1645–54. http://dx.doi.org/10.1243/09544062jmes1540.

Full text

Abstract:

The presence of several rolls in cluster cold rolling mills makes on-line vibration monitoring and failure analysis difficult. The dynamic behaviour of rolls strongly depends on the rolling pressure in the roll bite. Strip vibration applies a dynamic component on the rolling force acting on the work roll and may excite the resonance of the mill stand. This problem motivates predicting the cluster mill dynamics by using a numerical model. It may help in planning the maintenance operation of rolls and bearings and in reducing the service costs. A complete dynamic analysis of the cluster mill layout has seldom been proposed in the literature. In this article, the authors investigate the dynamic behaviour of a Sendzimir mill. A numerical simulator developed in the Matlab/Simulink environment is used to distinguish the effects of chattering, rolls unbalance, motor dynamic irregularities, and bearing fault. Analytical approaches proposed to compute the dynamic component of the rolling force are used as an input to excite the rolls vibration in the cluster mill simulator. Numerical results are used to interpret some preliminary experimental measures performed on the operating Sendzimir mill. Some goals were achieved. This investigation allowed the distinguishing of the dynamic effects due to the rolls from those related to the motor and bearings fault. Critical parameters used in the numerical model were identified. To complete this study, a fully instrumented cold rolling mill has to be used in order to measure all the dynamic signals required to detect the relevant phenomena that have to be prevented.

APA, Harvard, Vancouver, ISO, and other styles

4

Rubtsov, V. Yu, O. I. Shevchenko, and M. V. Mironova. "IMPROVING DYNAMIC REGIME OF ROLLING FOR INCREASING DURABILITY OF BALL-ROLLING MILL ROLLS." Izvestiya Visshikh Uchebnykh Zavedenii. Chernaya Metallurgiya = Izvestiya. Ferrous Metallurgy 61, no. 12 (January 16, 2019): 927–32. http://dx.doi.org/10.17073/0368-0797-2018-12-927-932.

Full text

Abstract:

One of the important reasons for the downtime of ball rolling mills is replacement of rolls due to their wear and tear. The degree and zones of critical wear of ball rolling rolls are investigated in the article, where the greatest wear is observed over the flanges in zone of billet capture. Conditions necessary to capture the blank and to perform rolling process are analytically determined. Variable frequency method of roll rotations is proposed as a progressive technology for blank supply. The results of tests for its variations in accordance with linear and quadratic law are presented. Known formulas determining average strain rate at rolls rotational speed change are converted for linear and quadratic dependences. Experimental studies have been carried out in conditions of EVRAZ Nizhnetagilsky Metallurgical Plant ball rolling mills during rolling of 60mm ball made of Sh-3G steel. Experiments were performed for given parameters of manual change in rolls rotation speed at blank capture by rollers. The results have shown a significant effect of change in rotational speed on average specific pressure during blank capture. Evaluation of torque-time and average contact pressure for calculated and experimental data are presented. Empirical characteristics are also described at variable rotational speed of rolls according to linear and quadratic law. Acceptable convergence of results of calculated and empirical characteristics is determined. Engineering solution has been proposed for that task. It consists in installation of a thyristor converter. This solution allows reduction of rolls speed before blank capture. Also, this solution will increase frequency to the nominal value according to the given law after blank capture. As an obtained result, there is uniform distribution of average contact pressure over the entire length of the roll under different operating conditions of mill in automatic mode. Application of this technique will reduce wear degree of the rolling tool. At the same time, productivity of ball rolling mill will be maintained. Rolls consumption and number of rolls change will decrease due to rolls wear.

APA, Harvard, Vancouver, ISO, and other styles

5

Kuroda, K., T. Kuboki, Y. Imamura, and C. Hayashi. "Design evaluation of multiroll mills for small-diameter wire rolling." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 215, no. 1 (January 1, 2001): 77–86. http://dx.doi.org/10.1243/0954406011520535.

Full text

Abstract:

A comprehensive study on the evaluation of mill designs was carried out for three types of multiroll mill for wire rolling by using both prototype mills and numerical experiments. The laboratory experiments were carried out in order to examine both the deformation and loading characteristics of two-, three- and four-roll mills using a set of rolls of the same diameter. As a result, the data allow a direct comparison of the rolling characteristics among the three types of mill, which is not found in previous work. The analytical results showed a good matching with the experimental results, and evaluation was then carried out on the three mills. It has been found that the four-roll mill ensures the highest reduction and the two-roll mill the lowest reduction under the restriction that certain dimensional precision of the rolled wire be maintained. This tendency becomes greater as wire diameter decreases and in practice it is recommended that a four-roll mill equipped with small-diameter rolls be used when rolling small-diameter wire. As regarding the loading characteristics, similar conclusions apply. Finally, domains were determined where four-roll mills show their marked superiority.

APA, Harvard, Vancouver, ISO, and other styles

6

Budnikov, A. S., B. A. Romantsev, and E. A. Kharitonov. "Determination of rolls diameter for screw-rolling mills." Izvestiya Visshikh Uchebnykh Zavedenii. Chernaya Metallurgiya = Izvestiya. Ferrous Metallurgy 61, no. 9 (October 21, 2018): 683–88. http://dx.doi.org/10.17073/0368-0797-2019-9-683-688.

Full text

Abstract:

The problem of determining the maximum diameter of working rolls is typical for screw rolling mills that have more than two working rolls. Precise determination of the working roll diameter is especially important for three-roll mills, which are widely used in such industries as rolling and calibration, and radial-shear rolling mills operating at large feeding and rolling angles. Typically, the diameter of working rolls is determined in a constructive way or using 3D modeling. These methods are quite complex, require special skills, and do not allow investigation of the influence of main tuning mill factors such as feeding and rolling angles. There is a calculated method for determining the diameter of the roll barrel for a three-roll mill, but it is applicable for mills working at feeding angles of up to 10 degrees and rolling angles of 4 – 7 degrees. In conditions of radial-shear rolling, this method is not used, since it does not take into account the influence of feeding and rolling angles on which the conditions of the deformation process, manufacturability and quality of the products depend. The article considers a more general method for determining the diameter of working rolls of three or more rolling mills, taking into account their rotation at the feeding and rolling angles. The relationship between diameter of the rolls, their number, minimum diameter of the deformation center, the feeding and rolling angles are shown, which makes it possible to evaluate the structural capabilities of both three and four-roll rolling mills. The results of the presented work make it possible to expand the possibilities for further studies of the technology and equipment of three-roll screw rolling mills for the production of solid and hollow products using completely new deformation modes for the processes of rolling out hollow products of their reduction as well as radial shearing rolling. Importantly, it is possible to supplement existing knowledge about the change in geometry of deformation center, and also to predict geometric parameters of the working rolls of the projected multi-roll mills for given rolled products sizes.

APA, Harvard, Vancouver, ISO, and other styles

7

Peng, Rongrong, Xingzhong Zhang, and Peiming Shi. "Vibration Characteristics of Hot Rolling Mill Rolls Based on Elastoplastic Hysteretic Deformation." Metals 11, no. 6 (May 26, 2021): 869. http://dx.doi.org/10.3390/met11060869.

Full text

Abstract:

Based on the analysis of the influence of roll vibration on the elastoplastic deformation state of a workpiece in a rolling process, a dynamic rolling force model with the hysteresis effect is established. Taking the rolling parameters of a 1780 mm hot rolling mill as an example, we analyzed the hysteresis between the dynamic rolling force and the roll vibration displacement by varying the rolling speed, roll radius, entry thickness, front tension, back tension, and strip width. Under the effect of the dynamic rolling force and considering the nonlinear effect between the backup and work rolls as well as the structural constraints on the rolling mill, a hysteretic nonlinear vertical vibration model of a four-high hot rolling mill was established. The amplitude-frequency equations corresponding to 1/2 subharmonic resonance and 1:1 internal resonance of the rolling mill rolls were obtained using a multi-scale approximation method. The amplitude-frequency characteristics of the rolling mill vibration system with different parameters were studied through a numerical simulation. The parametric stiffness and nonlinear stiffness corresponding to the dynamic rolling force were found to have a significant influence on the amplitude of the subharmonic resonance system, the bending degree of the vibration curve, and the size of the resonance region. Moreover, with the change in the parametric stiffness, the internal resonance exhibited an evident jump phenomenon. Finally, the chaotic characteristics of the rolling mill vibration system were studied, and the dynamic behavior of the vibration system was analyzed and verified using a bifurcation diagram, maximum Lyapunov exponent, phase trajectory, and Poincare section. Our research provides a theoretical reference for eliminating and suppressing the chatter in rolling mills subjected to an elastoplastic hysteresis deformation.

APA, Harvard, Vancouver, ISO, and other styles

8

Romantsev, B. A., E. A. Kharitonov, A. S. Budnikov, Van Chong Le, and Ba Khyui Chan. "SCREW ROLLING OF PIPES IN A FOUR-HIGH ROLLING MILL." Izvestiya. Ferrous Metallurgy 62, no. 9 (October 23, 2019): 686–90. http://dx.doi.org/10.17073/0368-0797-2019-9-686-690.

Full text

Abstract:

A model of four-high screw rolling mill was developed and manufactured with the help of additive technologies. The work rolls are installed: the main ones – by cup-shaped scheme and auxiliary – by mushroom scheme with an angle of rolling of ±7 degrees, with an unregulated feed angle of 15 degrees. The main and auxiliary rolls have a barrel length of 70 mm. Diameter of the main rolls in pinching is 50 mm, of auxiliary rolls – 36 mm. At the exit in cross section of the tube outlet from the rolls, their diameters are almost the same and are 72 mm. Each of the four rolls is driven by an individual drive with a 100 W motor-reducer and a rotational speed of 60 rpm by a mushroom scheme and of 83 rpm by a cup-shaped one, which minimizes the divergence of peripheral speeds in the deformation zone at different roll diameters. On the developed model of four-high rolling mill, rolling of liners from plasticine with a diameter of 25 mm with a wall thickness of 7.5 was carried out; 5.5 and 3.5 mm, corresponding to the ratio of diameter to wall thickness 3; 5 and 8. Pipe rolling was carried out on floating mandrels with diameters of 9, 13 and 17 mm. After rolling, measurements of the diameter and wall thickness of the pipes were carried out in 5 cross sections that were equally spaced from each other. In each cross section, the diameter was measured at 5, and the wall thickness at 10 points. The finite element method has been used to simulate the process of rolling these pipes in the QForm program. Assessment of the model adequacy was carried out by comparing the size of pipes and their accuracy after rolling with the results of computer simulation. When rolling at a four-high rolling mill, the wall thickness is significantly reduced.

APA, Harvard, Vancouver, ISO, and other styles

9

Chen, Ze Jun, Guang Jie Huang, Jian Jun Min, and Boa Hua Qian. "The Development of Short Stress Path Experimental Asymmetric Multifunctional Rolling Mill." Advanced Materials Research 145 (October 2010): 171–76. http://dx.doi.org/10.4028/www.scientific.net/amr.145.171.

Full text

Abstract:

This paper describes the development and design of a novel short stress path rolling mill which is used for teaching and research. The rolling mill can implement the asymmetric rolling by the way of the adjustment of upper roll speed, and also working as conventional rolling when the roll speeds of two rolls are equal. The rolling mill can produce not only the plate and sheet, but also profiles by the roll of different grooves. The rolling mill is appropriate for the rolling of the steels and nonferrous metals. In this paper, the design ideas and main parameters of principal components are presented with respect to the new rolling mill. It can provide references for the design and manufacture of rolling mill of similar functions and structures.

APA, Harvard, Vancouver, ISO, and other styles

10

Mauer, Paul, Bernhardt Weyh, and Paul Josef Mauk. "Hybrid Calculations of Bending Deformations for 20 Roll Cold Rolling Mill." Key Engineering Materials 716 (October 2016): 856–63. http://dx.doi.org/10.4028/www.scientific.net/kem.716.856.

Full text

Abstract:

In multi-high mills, the slim fixed floating work rolls are supported by primary and secondary intermediate rolls and several supporting rolls mounted pairs-wise on supporting shafts. Over the eccentric adjustment of saddle assemblies and hydraulic adjustment device the roll gap adjusts the specific elastic bending deformation of the support system. Based on a hybrid calculation model the influence and limits of an active adjustment device for 20 roll mill will be presented. Thereby the bending deformations as well as the contact deformations of the complete system including the forming process in settings of the elementary plasticity theory (EPT) will be considered.The modeling of the bending deformations of the roll systems are based on FE-Beam elements. The flattening in the contact zone between the rolls will be formulated by a modified non-linear approach, according to Hertz-Johnson. The contact of the deformed zone is aligned in the discretized EPT-roll model by Alexander with Hitchcock-flattening. The iterative analysis of the compact models leads to “force-deformation-relations”, which provides the influence of the variation of the gap. The force-deformation-relations will be detailed discussed in parameter studies of a real 20 roll mill.

APA, Harvard, Vancouver, ISO, and other styles

11

Yin, Zi Wu. "Three-Roll Planetary Rolling Mill Motion Analysis and Test Research." Advanced Materials Research 712-715 (June 2013): 1724–28. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1724.

Full text

Abstract:

Against defects of three-roll fixed axis rolling mill caused by rolled piece rotating in process of rolling, presented three-roll planetary rolling scheme, designed the planetary transmission system structure, expounded planetary mill rolling process, analyzed movement relationship between planet carrier, roll and rolled piece according to planetary gear train transmission principle. The rolls do planetary motion and spinning motion both, the former acts on the rolled piece to make it do clockwise rotation movement, the latter acts on the rolled piece to make it do anti-clockwise rotation. The actual movement of rolled piece is combination of the two motions. The theoretical analysis and calculation shows that in rolling process of planetary mill, the speeds of above two kinds of motions are very close, directions are opposite. Due to rolls are inclined compare to the rolled piece, as a result rolled piece does axial movement with a speed of vsinα, radial rotation speed is 0.0029 times of planet carrier rotational speed. Thanks to complexity of extrusion and friction between rolls and rolled piece, the actual speed of rolled piece is approximately zero. Prototype rolling test has verified correctness of theoretical analysis and calculation.

APA, Harvard, Vancouver, ISO, and other styles

12

Li, H. C., Zheng Yi Jiang, A. Kiet Tieu, Wei Hua Sun, Hei Jie Li, and Dong Bin Wei. "Surface Roughness and Wear of Work Roll Containing Ti in Cold Strip Rolling." Advanced Materials Research 32 (February 2008): 157–60. http://dx.doi.org/10.4028/www.scientific.net/amr.32.157.

Full text

Abstract:

The consumption of work rolls in cold strip mills is significant. One of the key issues for work rolls is the surface roughness which affects the rolling stability and surface finish of the strip. The produced strip has lower surface finish if the roll surface roughness is large. However, if the roll surface roughness is small, it is not helpful for establishing the rolling process, which will reduce the productivity. In this case, a laser treatment is employed to increase the value of roll surface roughness. In order to reduce the times of roll grinding, the cold strip mill and roll manufacturers have developed new types of rolls such as the rolls containing Ti to increase the roll wear resistance in cold strip rolling. Results show that the new 4CrTi roll has a significant advantage of preventing decrease of the roll surface roughness. The size and generation of particles during roll wear process and the effect of Ti on roll wear have been discussed.

APA, Harvard, Vancouver, ISO, and other styles

13

Bobarikin, Yu L., and Ya I. Radkin. "Research on the effect of the grooving of mill rolls of the reeling tube mill on the wear of the elongating mandrel." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 4 (January 14, 2019): 65–69. http://dx.doi.org/10.21122/1683-6065-2018-4-65-69.

Full text

Abstract:

By means of numerical simulation the influence of the geometry of calibers of mill rolls on the wear of the elongating mandrel is determined. The type of the grooving of mill rolls of a continuous three roll reeling mill, which reduces the wear of the elongating mandrel during the rolling, is determined.

APA, Harvard, Vancouver, ISO, and other styles

14

Borisov, I. A., and S. S. L’vova. "Choice of steel for rolling mill rolls." Metal Science and Heat Treatment 51, no. 5-6 (May 2009): 272–77. http://dx.doi.org/10.1007/s11041-009-9145-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Gorbatyuk, S. M., and L. V. Sedykh. "Improving the durability of rolling-mill rolls." Metallurgist 54, no. 5-6 (September 2010): 299–301. http://dx.doi.org/10.1007/s11015-010-9297-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Ma, Xu, Jing Yun Ma, Zhi Long Feng, Hong Lei Cui, Yu Yang, Yun Tao Li, Jian Zhang, Yan Hong Ding, and Jian Ping Li. "Finite Element Simulation of Biting Process of Cold Rolling Strip for 6-High Mill." Materials Science Forum 704-705 (December 2011): 203–9. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.203.

Full text

Abstract:

In this work, On the basis of software ANSYS/LS-DYNA, the strip cold rolling simulation model was established. The process from biting to rolling steady were simulated and investigated for 6-high UCM (6-high middle rolls shift type HC-mill with middle roll bender) cold mill, including the stress, stain state, and velocity field of the workpiece and rolls. The result states that the stability of Biting Process of 6-high cold mill is preferable and the impact of biting process on the roll is acceptable. The simulation regularity corresponds well with the measurements.

APA, Harvard, Vancouver, ISO, and other styles

17

Zhang, Ying, Li Liu, Pei Ming Shi, and Bin Liu. "Vertical Vibration Characteristics Analysis of Stand Rolls System in Six-Roll Cold Tandem Mill." Applied Mechanics and Materials 470 (December 2013): 572–76. http://dx.doi.org/10.4028/www.scientific.net/amm.470.572.

Full text

Abstract:

A dynamic model of seven degree of freedom for the vertical vibration of stand rolls system in a cold tandem mill is developed by Kinematics Theory. According to the actual parameters of a factory six-roll cold rolling mill, the influence of natural frequency and modes for rolling process is analyzed. It finds that the third-order and the six-order natural frequency play a role key in vertical vibration system. Combined with energy distribution of each part and flexibility of the modes analysis for vertical vibration system, it can avoid resonance of rolling process and optimize the parameters of stand rolls system by adjusting structural size appropriately. The above mentioned results have provided a reference for further research on Kinematics and structural optimization of six-roll cold tandem mill.

APA, Harvard, Vancouver, ISO, and other styles

18

Hou, Dongxiao, Rongrong Peng, and Haoran Liu. "Analysis of Vertical-Horizontal Coupling Vibration Characteristics of Rolling Mill Rolls Based on Strip Dynamic Deformation Process." Shock and Vibration 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/543793.

Full text

Abstract:

Nonlinear dynamic rolling forces in the vertical and horizontal directions are, respectively, established, considering the impact of vertical and horizontal directions vibration of rolls. Then a vertical-horizontal coupling nonlinear vibration dynamic model of rolling mill rolls is proposed, based on the interactions between this dynamic rolling force and mill structure. The amplitude-frequency equations of the main resonance and inner resonance are carried out by using multiple-scale method. The characteristics of amplitude frequency under nonlinear stiffness, damping, and amplitude of the disturbance are obtained by adopting the actual parameters of 1780 rolling mills. Finally, the bifurcation behavior of the system is studied, and it is found that many dynamic behaviors such as period, period-3 motion, and chaos exist in rolling mill, and this behavior could be restrained effectively by choosing proper system parameters.

APA, Harvard, Vancouver, ISO, and other styles

19

Zheng, Yong Jiang, Guang Xian Shen, Yi Geng Li, Ming Li, and Hong Min Liu. "Spatial Vibration Characteristics of Four-High Rolling Mills." Advanced Materials Research 694-697 (May 2013): 481–84. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.481.

Full text

Abstract:

The contemporary four-high mills are unstable and four-high rolling mill vibrations take place in six DOF leading to spatial behaviors involving vertical, horizontal, axial, reverse, cross and swinging vibration modes resulting in complex relative motions between the rolls. In this paper, a spatial vibration characteristic analysis of two four-high rolling mills with different stability will be presented based on the transfer matrix method (TMM) and Finite Element Method (FEM). The natural frequency and mode shape of four-high rolling mill are obtained. Vibration experimental results will be presented to prove the validity of the spatial vibration of rolling mill.

APA, Harvard, Vancouver, ISO, and other styles

20

Li, Xu, Dian Hua Zhang, Peng Fei Wang, and Wen Xue Zhang. "Analysis of Contact Pressure between Rolls under Non-Symmetrical Roll Bending of UCM Cold Rolling Mill." Advanced Materials Research 145 (October 2010): 80–86. http://dx.doi.org/10.4028/www.scientific.net/amr.145.80.

Full text

Abstract:

. For UCM cold rolling mill, the intermediate roll shifting can enhance the ability of mill for better flatness control, but it will increase the non-uniform distribution of pressure between rolls, as result of a reduced roll life. In order to improve the contact state among rolls in rolling processes and to slow down the roll wear, the distribution of pressure between rolls under different forms of roll bending control has been calculated and analyzed by the influence function method in this paper. For the purpose of obtaining comprehensive information, not only the distributions of pressure between rolls with traditional work roll symmetrical bending and intermediate roll symmetrical bending have been analyzed, but also the distributions of pressure between rolls with non-symmetrical roll bending have been analyzed. All the analyses show that the work roll non-symmetrical bending as well as the intermediate roll non-symmetrical bending can play an important role in the slowing down of roll wear.

APA, Harvard, Vancouver, ISO, and other styles

21

Rubtsov, V. Yu, and O. I. Shevchenko. "Calibration of ball-rolling rollers with continuously variable pitch." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information, no. 8 (September 1, 2018): 58–63. http://dx.doi.org/10.32339/0135-5910-2018-8-58-63.

Full text

Abstract:

Presented is the state of ball rolling production, review of existing techniques for roll pass design ball-rolling today development. Possibilities of roll pass design with regard to the existing metal cutting equipment and variation of pitch parameters. The priority is set for the use of rolling rolls with a continuously varying pitch, in comparison with rolls with discretely varying pitch. Possibility of using 5-axis milling equipment for obtaining a given profile, with several variable values, is shown. Model is developed for calculating the roll pass design for rolls with a continuously varying pitch, the save constant amounts of metall of workpiece between the rolls in every moments. Pitch change functions for roll pass design of ball rolling with a constant and variable flange width are derived, using which it is possible to determine the theoretical pitch at any rolls rotation angle. Technique for constructing a 3-D model is developed, based use on obtained curve of the 2nd order, which is the basis helical surface with a continuously varying pitch. Production of profile on a 5-axis machining center, according to the the 3D models suggest. Roll pass design was used ob the experience practical, with production example ball with a diameter of 120 mm, which were calculated from the deduced function for rolls with a constant width of the flange. He was tested in the conditions of the newly introduced ball-rolling mill of JSC "EVRAZ-NTMK". After introduction of a new roll pass design, were resived technical results: the reduction in force rolling, in contrast at use operating rolls with discretely varying pitch, by 25–30%, obtaining ball sizes that are as close to nominal values GOST standard, decreased of defects, uniformity forge along entire length of the rolls forming-part obtaining.The analytical solutions presented in this article, in combination with industrial approbation, make it possible to use a new method roll pass design rolls of a ball rolling mill with a continuously changing pitch for educational and production purposes.

APA, Harvard, Vancouver, ISO, and other styles

22

Sun, Da Le, Jian Guo Zhao, and Liang Yu Chen. "Finite Element Analysis of Temperature and Crown of Rolls in Hot Strip Rolling." Applied Mechanics and Materials 16-19 (October 2009): 575–79. http://dx.doi.org/10.4028/www.scientific.net/amm.16-19.575.

Full text

Abstract:

In this paper a three-dimensional numerical computation on temperature and crown of rolls in hot strip rolling was evaluated based on finite element method and parallel computation technology with multiple CPUs. A comparison between calculated results and actual data collected from rolling mills was presented, which indicated the high accuracy of the model. The calculated results indicated that a significant impact in thin layer of work roll surface was brought by thermal load, while much weaker in the core. Furthermore, the temperature field and thermal crown of hot mill work rolls would reach a stabilized condition only when several rolling cycle be finished.

APA, Harvard, Vancouver, ISO, and other styles

23

Kővári, Attila. "Observer Based Leakage Detection of Hydraulic Cylinder Applied in Rolling Mills Electro-Hydraulic Gap Adjustment System." Materials Science Forum 729 (November 2012): 424–29. http://dx.doi.org/10.4028/www.scientific.net/msf.729.424.

Full text

Abstract:

Hydraulic system is commonly used in the modern strip rolling mills to adjust the gap between the work rolls. Automatic gauge control based on the hydraulic systems is commonly used in modern strip rolling mills to adjust the gap between work rolls. The dynamic control of rolling gap and force is achieved by using electro-hydraulic servo actuators so-called hydraulic capsules which can adjust the rolling gap dynamically for high rolling force. The basic aim of the paper is to define an observer which could forecast the required maintenance of hydraulic cylinder using parameter estimation of the mill model.

APA, Harvard, Vancouver, ISO, and other styles

24

Jin, Xin, Chang-sheng Li, Yu Wang, Xiao-gang Li, Tian Gu, and Yong-guang Xiang. "Multi-Objective Optimization of Intermediate Roll Profile for a 6-High Cold Rolling Mill." Metals 10, no. 2 (February 21, 2020): 287. http://dx.doi.org/10.3390/met10020287.

Full text

Abstract:

The multi-objective optimization of the SmartCrown intermediate roll profile for a cold rolling mill was proposed in this paper in order to improve the strip flatness quality. A coupling model of roll profile and strip flatness was established, and the roll gap profile, roll gap crown adjustment range, rolls contact pressure, and strip flatness under different intermediate roll profile parameters were calculated based on the coupling model. The results showed that the roll gap crown adjustment range and rolls contact pressure difference increased with increasing roll profile parameters. The roll profile parameters were multi-optimized based on the non-dominated sorting genetic algorithm II (NSGA-II). The minimum rolls contact pressure difference and maximum roll gap crown adjustment range were taken as the objective function of multi-objective optimization. The optimal roll profile parameters were applied to a six-high five stand tandem cold rolling mills, which improved the flatness quality of the DP780 steel strip.

APA, Harvard, Vancouver, ISO, and other styles

25

Aljabri, Abdulrahman, Zhengyi Jiang, and Dongbin Wei. "Analysis of thin strip profile by work roll crossing and shifting in asymmetrical cold rolling." International Journal of Modern Physics B 29, no. 10n11 (April 23, 2015): 1540032. http://dx.doi.org/10.1142/s0217979215400329.

Full text

Abstract:

In order to analyze the effects of cold rolling parameters such as the crossing angle and axial shifting value of work rolls on the strip profile, extensive tests were carried out on a 4-high rolling mill equipped with a work roll crossing and shifting system. The results show that the strip profile is nearly flat under asymmetrical rolling. The rolling force was also analyzed in detail by changing the crossing angle and axial shifting value of work rolls.

APA, Harvard, Vancouver, ISO, and other styles

26

Shi, Shu Zheng, Shao Lei Wang, Ming Xing Song, and Zhen Zhen Huo. "Modeling and Simulation Analysis of Five Times Frequency Flutter of Rolling Mill." Applied Mechanics and Materials 741 (March 2015): 411–15. http://dx.doi.org/10.4028/www.scientific.net/amm.741.411.

Full text

Abstract:

Based on nonlinear damping and stiffness consideration between not only work rolls but also back-up roll and body frame, five times frequency flutter model of rolling mill was built according to actual structure of rolling mill, which followed by simulation analysis. Some theoretical guidance can be provided for practical engineering application.

APA, Harvard, Vancouver, ISO, and other styles

27

Bai, Jin Lan, and Hong Zhi Pan. "Study on Flatness Control Strategy of a Single-Stand Reversing Cold Rolling Mill." Advanced Materials Research 1004-1005 (August 2014): 1193–97. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.1193.

Full text

Abstract:

In this paper, an integrated rolls system deformation calculation model is established based on the influence function method combining with pass schedule calculation, rolls wear and roll thermal deformation calculation, and the corresponding calculation procedure has been developed. Then the influence of work roll bending, work roll shifting and intermediate roll bending on transverse distribution of strip thickness, strip crown, quadratic flatness, and quartic flatness are analyzed with the procedure. According to the analysis result, flatness control strategy of the single-stand reversing cold rolling mill is determined. The flatness control strategy will provide the basis for flatness control presetting of the mill. The practical application shows that the flatness control strategy is suitable for flatness control of the single-stand reversing cold rolling mill.

APA, Harvard, Vancouver, ISO, and other styles

28

Lu, Xing, Jie Sun, Guangtao Li, Zhenhua Wang, and Dianhua Zhang. "Stability Analysis of a Nonlinear Coupled Vibration Model in a Tandem Cold Rolling Mill." Shock and Vibration 2019 (February 17, 2019): 1–14. http://dx.doi.org/10.1155/2019/4358631.

Full text

Abstract:

Mill chatter in tandem cold rolling mill is a major rejection to the quality and production of the strips. In most mill vibration models, either the roll mass is usually limited to vibrate in vertical direction and vertical-horizontal directions, or the multiple rolls system is simplified to a single mass system. However, the torsional chatter is also a typical type of mill chatter, and the presence of intermediate roll and backup roll will affect the overall vibration of the mill structure system. In this paper, a newly cold rolling mill vibration model coupled with the dynamic rolling processing model and nonlinear vibration model is proposed with the consideration of dynamic coupling and nonlinear characteristics of the rolling process, multiroll equilibrium, and roll movement in both vertical-horizontal-torsional directions. By using Hopf bifurcation theorem and Routh–Hurwitz determinant, the existence of the Hopf bifurcation point of the mill vibration system and bifurcation characteristics are analyzed. At last, the influence of different rolling conditions on the stability of the coupled mill system is investigated, and these results can also be used to design an optimum rolling schedule and determine the appearance of mill chatter under certain rolling conditions.

APA, Harvard, Vancouver, ISO, and other styles

29

Artiukh, Viktor, Vladlen Mazur, Sergey Kargin, and Nikolay Bushuev. "Reasonability to use device for making horizontal wedge thrust of rolling stand." MATEC Web of Conferences 170 (2018): 03011. http://dx.doi.org/10.1051/matecconf/201817003011.

Full text

Abstract:

Necessity and reasonability to use gapless connection between contact surfaces of lining straps of work rolls chocks and facing strips of housings (inner lining straps of back-up rolls chocks) to reduce dynamic horizontal forces during rolling and increase durability of equipment are considered. Technical solution is described on base of roughing reversing rolling stand of thick sheet rolling mill 3000 of PJSC ‘ILYICH iron and steel works’ (Mariupol city, Ukraine) which can be used on most heavy loaded sheet and tube rolling mills.

APA, Harvard, Vancouver, ISO, and other styles

30

Hsu, Han-Kai, and Jong-Ning Aoh. "Effect of Clearances in Mill Stands on Strip End Motion During Finishing Rolling." Metals 9, no. 7 (June 27, 2019): 727. http://dx.doi.org/10.3390/met9070727.

Full text

Abstract:

The process stability of finishing mill is significantly influenced by the clearance between the chocks and housing in mill stands. The on-site data of a finishing mill had shown that the clearances in the finishing mill stands were clearly associated with the incidence of strip end flip. The aim of this work was to establish a numerical model to analyze the effect of the clearances on the deviation of the centerline of the strip and on the incidence of strip end flip. By adopting conditions from a particular strip, the numerical model not only predicted the strip end shape, but also visualized strip end flip, which would be otherwise invisible. Four different degrees of asymmetry regarding work rolls and backup rolls were postulated. It was found that the degradation of the work rolls’ clearance level was the most significant influence on the centerline deviation of the strip. Strip end flip was most susceptible to the degradation of the horizontal clearance of the work roll. The simultaneous degradation of the work rolls’ and backup rolls’ level of clearance led to larger reactions and enhanced the asymmetric wear on the liners. The superimposed axial clearances at the roll end provided an axial constraint to the work roll, and were able to reverse the trend of centerline deviation. The numerical results provided a guideline for designing a suitable maintenance strategy for clearances.

APA, Harvard, Vancouver, ISO, and other styles

31

Kiss, Imre. "Laboratory Researches upon the thermal fatigue of the organs of machines in movement of rotation, in variable temperature mediums." Analecta Technica Szegedinensia 8, no. 1 (January 11, 2014): 59–65. http://dx.doi.org/10.14232/analecta.2014.1.59-65.

Full text

Abstract:

The researches of durability in the exploitation of cast-iron rolls define experimentally an important chapter from the thermal fatigue of the organs of machines in the movement of rotation, in variable temperature mediums. The researches on the durability in exploitation of hot rolling mill rolls represent an important scientific and economical issue. This paper presents original experimental equipment by the help of which the durability of hot rolling mills can be studied. This experimental equipment permits the evaluation of exploitation durability for hot rolls by studying the thermal fatigue phenomenon which appears in the case of machine components. The exploitation durability is evaluated through thermal fatigue cycles up to crack point due to thermal fatigue for each condition and each type of studied material. The study represents a detailed approach of the influence of various technological factors on the durability in exploitation of rolling mill rolls made of different steel and pig iron grades and suggests solutions meant to increase the durability of the rolls in exploitation.

APA, Harvard, Vancouver, ISO, and other styles

32

Xu, Bao Yu, Yi Lun Liu, Xu Dong Wang, and Yu Qing Wang. "Stochastic Stability of Hot Strip Rolling Mill Rolls." Advanced Materials Research 216 (March 2011): 698–702. http://dx.doi.org/10.4028/www.scientific.net/amr.216.698.

Full text

Abstract:

A two dimensional stochastic nonlinear dynamical model of rolls is presented considering the stochastic factor of the rolling force. The Hamilton function is also described as one dimension diffusion process by using stochastic average method, the singular boundary theory was taken for analyzing the global stochastic stability of the system, and the system’s stochastic stability is researched by solving the Fokker-Planck-Kolmogorov (FPK) equation. The results show that the generalized energy H in the range of 0.02 to 0.4, the system’s response has the minimum transition probability density, and the system state is not easy to change, therefore the system generalized energy H should be to limit in this range in the design and operation of the rolling mill.

APA, Harvard, Vancouver, ISO, and other styles

33

Belzunce, F. J., A. Ziadi, and C. Rodriguez. "Structural integrity of hot strip mill rolling rolls." Engineering Failure Analysis 11, no. 5 (October 2004): 789–97. http://dx.doi.org/10.1016/j.engfailanal.2003.10.004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Shmyrev, I. P., L. I. Tregubova, S. P. Shivtsov, and R. N. Goryanaya. "Heat treatment of rolling mill rolls KhPT90-120." Metal Science and Heat Treatment 28, no. 2 (February 1986): 141–43. http://dx.doi.org/10.1007/bf00717537.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Salem, Shabur. "Alloyed steel intended for hot rolling mill rolls." Metal Science and Heat Treatment 35, no. 11 (November 1993): 657–59. http://dx.doi.org/10.1007/bf00712290.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Zazulyak, V. A., A. M. Legun, S. E. Kovchik, and A. I. Darchuk. "Crack resistance of large rolling-mill backup rolls." Soviet Materials Science 20, no. 5 (1985): 497–98. http://dx.doi.org/10.1007/bf00723151.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Spuzic, S., K. N. Strafford, C. Subramanian, and G. Savage. "Wear of hot rolling mill rolls: an overview." Wear 176, no. 2 (August 1994): 261–71. http://dx.doi.org/10.1016/0043-1648(94)90155-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Sun, Jian Liang, Yan Peng, Hong Min Liu, and Gang Liu. "Rolling Theory Analysis and Forces Calculation of Heavy Cylinder Rolling Mill with Two Drive Rolls." Advanced Materials Research 572 (October 2012): 13–18. http://dx.doi.org/10.4028/www.scientific.net/amr.572.13.

Full text

Abstract:

Took the heavy cylinder rolling mill as subject investigated, which is used to produce the nuclear power cylinder, the large hydrogenation reactor cylinder and the coal liquefaction reactor cylinder. And the cylinder rolling mill has two drive rolls which is different from conventional ring rolling mill. The rolling theory of heavy cylinder rolling mill was researched deeply based on mechanism method, including the biting condition, the plastic penetration condition, the feed condition and the feed velocity condition; the rolling force parameters of heavy cylinder rolling mill with two drive rolls were calculated based on the slip line method (SLM) and finite element method (FEM), and the simulation and industrial experiment were done; the influences of main technology parameters such as feed velocity, friction coefficient and temperature on the rolling force parameters were analyzed. The results show that the error of calculated rolling force and the measured value is less than 5%, which proves that the basic conditions deduced by theory method are correct, the models established based on SLM and FEM are correct. And with the increase of feed velocity, the rolling force increase, after a rolling circle, the rolling force fluctuates at a constant value; with the increase of friction coefficient, the rolling force increase; with the increase of initial temperature, the rolling force decrease.

APA, Harvard, Vancouver, ISO, and other styles

39

Mottahedi, Ali Akbar. "Investigation of Phase Transformation of Forged Steel Cold Rolls due to Heat Affecting and Prevent its Failure." Defect and Diffusion Forum 289-292 (April 2009): 219–24. http://dx.doi.org/10.4028/www.scientific.net/ddf.289-292.219.

Full text

Abstract:

In rolling Industries, cold rolls are chosen of low alloy steel heat treated to about 60 RC in 50 millimeter depth on surface. Troostite phase which happens in some cases in tempered martensite has lower fracture toughness, although its ductility is a little more. In rolling process, some technological problems seldom take place, and the roll might be locally heated accidentally. In cold rolling technology, this effect may cause a phase change in metallurgical structure on the surface of the cold work forged steel rolls, named Troostite. However, the rolls which subjected to this problem have no mechanical defect to be detected by NDT, but these kinds of affected rolls may be failed in working (rolling) by fracture, spalling or cracks. So Troostite is a harmful phase for rolls and causes lots of losses for rolling companies. The following paper is a practical industrial approach to show and follow thermal instability of roll surface and metallurgical change of the surface from sorbite to troostite by diffusion mechanism, due to any improper mill usage.

APA, Harvard, Vancouver, ISO, and other styles

40

Gimaletdinov, Radiy Kh, Andrey A. Gulakov, and Ildar Kh Tukhvatulin. "Effect of chemical composition on the performance of centrifugally cast indefinite chilled cast iron rolls." Vestnik of Nosov Magnitogorsk State Technical University 17, no. 1 (March 25, 2019): 32–36. http://dx.doi.org/10.18503/1995-2732-2019-17-1-32-36.

Full text

Abstract:

Problem Statement (Relevance): An urgent task of rolling mill operators includes minimizing the cost of manufactured products while ensuring the required quality. To accomplish the task, measures are being taken to optimize the rolling process aimed at increasing the duration of the rolling campaigns and reducing the number of roll regrinds. The performance of the rolls is influenced by the properties of the working layer material which determine wear resistance, formation and development of fire cracks, as well as resistance to metal sticking. Finishing mill rolls dictate the surface quality of the rolled steel. That is why it is important to make timely regrinds in order to completely remove the fire crack layer. The removal depth and the acceptable duration of the campaigns depend on the properties of the roll working layer material. To improve the properties of the rolls, the roll manufacturers need the actual roll operation data to be able to analyze how the chemical composition and the structure of the roll working layer is related to the roll performance. Such analysis will help improve the structure and properties of the materials used, as well as develop new ones. Objectives: The objective of this research is to understand how the chemical composition of the working layer of indefinite chilled cast iron rolls used in finishing mills dictates the roll performance, to evaluate the effect of each chemical element, and to determine what concentrations of the chemical elements could most effectively benefit the performance of indefinite chilled cast iron rolls. Methods Applied: The methods applied include building a database of the finishing mill indefinite chilled cast iron rolls and using artificial neural networks based on a dual-function algorithm. Originality: The authors built a neuromodel which can help understand the effect of the chemical composition of the roll working layer and predict the performance of indefinite chilled cast iron rolls. The authors studied the effect of carbon, silicon, manganese, chromium, nickel, molybdenum, vanadium, niobium and boron on the performance of indefinite chilled cast iron rolls. Findings: Graphic diagrams were built which demonstrate the effect of each chemical element on the performance of indefinite chilled cast iron rolls at constant concentrations of the remaining elements. The authors looked at the relationship between the chemical elements and the roll performance in terms of the impact of the former on the structure of indefinite chilled cast iron rolls. The effective concentrations of the chemical elements were also determined. Practical Relevance: The authors developed a new chemical composition of indefinite chilled cast iron to be used for the working layer of finishing mill rolls. As a result, a 12–14% increase in the roll performance was achieved.

APA, Harvard, Vancouver, ISO, and other styles

41

Song, Guang Yi, Xiao Chen Wang, Quan Yang, and Jian Wei Zhao. "Optimization Technology of Roll Contours during Skin-Pass Rolling Process of Hot-Rolled Strip." Materials Science Forum 944 (January 2019): 237–46. http://dx.doi.org/10.4028/www.scientific.net/msf.944.237.

Full text

Abstract:

The hot-rolled strip skin-pass mill is the important technological equipment of finishing process in the hot rolling plant, and its role is to apply a slight thickness reduction of approximately 1% - 4% to the finished products cooled to room temperature to repair flatness defects and improve the surface quality and mechanical properties. In this study, the initial flat roll contours were optimized to solve some problems such as the serious and non-uniform wear of work rolls and the poor shape control abilities of the strip. A three-dimensional rolls–strip coupling model of hot-rolled strip skin-pass mill was established using the nonlinear finite element software ABAQUS. The effects of the roll contours on the contact pressure between rolls and the control effect of bending forces were analyzed, and a variable contact-length backup roll (VCR) contour configured with a positive crown contour for work rolls was proposed. Compared with the initial flat roll contours, the average replacement cycle of work rolls for the optimized roll contours increased from 465.4 tons to 701.3 tons, the non-uniform wear amount was reduced by nearly 15%, and the adjustment ratio of the negative bending forces decreased from -100% to -40% by industrial experiments in the 1580 mm single-stand four-high hot-rolled strip skin-pass mill.

APA, Harvard, Vancouver, ISO, and other styles

42

Kinzin, D. I., S. A. Levandovskiy, and O. N. Tulupov. "Analysis of Efficiency of Roll Pass Design Options for Roughing Stands of Section Rolling Mill." Solid State Phenomena 265 (September 2017): 1136–41. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.1136.

Full text

Abstract:

The analysis of two roll pass design options of ten roughing stands atOJSC “MMK” 370 rolling mill has been performed. The usage of a new form of the roll grooves will allow achieving higher durability of the rolls. Lesser rolls consumption will allow saving up to 800K rubles annually. More uniform load distribution by the stands will reduce the possibility of main mill lines equipment breakdowns due to the jumps of rolling torque in the most loaded non-equiaxial stands. Better contact conditions and higher billet stability at the input into equiaxial grooves will reduce the amount of metal clogging. Moreover, a changed strain diagram – with higher roll pass design efficiency factor – will increase the roll out of foundry production defects.

APA, Harvard, Vancouver, ISO, and other styles

43

Li, Ming, Yong Jiang Zheng, Guang Xian Shen, and Jing Liang Ma. "Four-High Mill with Statically Determinate Characteristics of Micro Displacement of the Components." Advanced Materials Research 97-101 (March 2010): 2015–20. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.2015.

Full text

Abstract:

The theory of micro dimensional behavior on rolling mill is used for a typical 450 mm hot plate four-high mill. A statically determinate device is adopted on the back-up roll system to adapt to the micro-dimensional deflection. We replace the traditional single base with the force divided base for the rolling load. To make the rolls parallel, a worm-screw device is set in the chock, with a clearance between the chock and the stand window to allow convenient roll replacement and retain a thermal expansion space. In the new mill, the center line of the roll body is constant when the rolling is stopped or running. It can be predicted that the mill will be strengthened two times and the roller bearing life will be prolonged ten times.

APA, Harvard, Vancouver, ISO, and other styles

44

Li, Bo, Qing Dong Zhang, and Xiao Feng Zhang. "Effect of Three Types of Driving Modes of Rolling Mill with Six Rolls on the Friction Force between Rolls." Advanced Materials Research 572 (October 2012): 176–80. http://dx.doi.org/10.4028/www.scientific.net/amr.572.176.

Full text

Abstract:

Three-dimensional finite element model of rolling mill with six rolls in a factory is modeled by nonlinear FEM software called ABAQUS. It is a three-dimensional elastic-plastic rolling model. It includes not only elastic-plastic deformation of strip but also the bending of roll system and flattening of rolls. It can describe the changes in friction force between rolls better. Conclusions are as follows. When the driving roll is the backup roll, friction force between the backup roll and the intermediate roll is easy to reach the maximum value, slipping phenomenon is easy to appear. When the driving roll is the intermediate roll, friction force between the intermediate roll and the work roll is easy to reach the maximum value, slipping phenomenon is easy to appear. When the driving roll is the work roll, the changes in frictional force between the rolls is smooth. Slipping phenomenon is not easy to appear.

APA, Harvard, Vancouver, ISO, and other styles

45

Peng, Rongrong, Xingzhong Zhang, and Peiming Shi. "Vertical–Horizontal Coupling Vibration of Hot Rolling Mill Rolls under Multi-Piecewise Nonlinear Constraints." Metals 11, no. 1 (January 18, 2021): 170. http://dx.doi.org/10.3390/met11010170.

Full text

Abstract:

This study establishes a vertical–horizontal coupling vibration model of hot rolling mill rolls under multi-piecewise nonlinear constraints considering the piecewise nonlinear spring force and piecewise nonlinear friction force constraints of the hydraulic cylinder in the vertical direction of the rolls, the piecewise stiffness constraints in the horizontal direction, and the influence of the nonlinear dynamic rolling force in the rolling process. Using the average method to solve the amplitude–frequency response equation of the coupled vibration system and taking the actual parameters of a 1780 mm hot rolling mill (Chengde Steel Co., Ltd., Chengde, China) as an example, we study the amplitude–frequency characteristics of the mill rolls under different parameter settings. The results show that the amplitude and resonance region can be reduced by appropriately reducing the external disturbance force and the nonlinear spring force of the hydraulic cylinder, appropriately increasing the nonlinear friction force, and eliminating the gap between the bearing seat and the mill housing, to avoid the amplitude jump phenomenon due to piecewise variation. Furthermore, using the singularity theory to study the static bifurcation characteristics of the coupled vibration system, we establish a relationship between the vibration parameters and the topological bifurcation solution of the coupled system. The transition sets and their corresponding bifurcation topological structure in three cases are given, and the steady and unsteady process parameter regions of the rolls are obtained. The dynamic behavior of the coupled vibration system can be controlled by varying the bifurcation parameter. This study provides a theoretical basis for restraining the vibration of hot rolling mill rolls and optimizing the process parameters.

APA, Harvard, Vancouver, ISO, and other styles

46

Zuyeu,, I. A., and Yu L. Bobarikin. "WAYS TO INCREASE QUALITY OF PRODUCTS AT THE BAR STOCK WIRE ROLL MILL 150 IN OJSC «BSW» – MANAGEMENT COMPANY OF HOLDING «BMC»." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 3 (October 10, 2017): 24–26. http://dx.doi.org/10.21122/1683-6065-2017-3-24-26.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Rakhmanov, S. R. "Some peculiarities of the process of the pipe purse firmware on the firmware." Metallurgicheskaya i gornorudnaya promyshlennost, no. 1 (2019): 31–39. http://dx.doi.org/10.33101/s001-1700087840.

Full text

Abstract:

Purpose. Conducting research aimed at choosing the rational modes of flashing the tubular billet by stabilizing the dynamic characteristics of the drive power line of heavy-duty piercing mills TPA. Methodology. The dynamics of the power line of the piercing mill of the pipe-rolling unit (TPA) are considered, taking into account the peculiarities of the behavior of the spindle hinges and the mechanism for setting the work rolls. Findings. The differential equation of motion of the line of the main drive of the piercing mill is composed and its numerical solution is given. An adapted three-mass dynamic model of the system is considered and a solution is obtained using the software Solid Works IT Simulation X. The basic conditions for the occurrence of unstable dynamic phenomena in the fieldline and the installation mechanism of the piercing mill rolls are formulated. It is shown that the unstable dynamics of the system are one of the main reasons for the discrepancy between the results of well-known theoretical, experimental studies and pipe thickness measurement at TPA 350 piercing mills. Originality. The main causes of the emergence of parametric oscillations in the drive of the working stand of the piercing mill, the installation mechanism of the work rolls in connection with the mechanism of formation of the thin-wall thickness of pipes are established. The areas of stability of the system’s functioning are determined depending on the operating modes and the angle of feed of the work rolls, taking into account the spatial position of the elements of the spindle device. The necessary and sufficient stability conditions for the joint stable functioning of the power line elements of the piercing mill are formed. Practical value. To stabilize the processes for flashing the tubular billet, a scheme has been proposed for upgrading the spindles of the main drive and the mechanism for installing the work rolls of the piercing mill No. 1 of TPA 350. The results are applicable to similar helical rolling mills. Keywords: firmware, billet, mill, pipe, uneven stroke, varying thickness, dynamics, drive, roll, oscillations, spindle, Cardan, hinge, moment of inertia, rigidity, drum, installation mechanism, stability.

APA, Harvard, Vancouver, ISO, and other styles

48

Zhou, Xiao Min, Yang Jun Mao, and Yun Feng Wu. "Tapered Work Roll Shape Design and Optimization for Cold Tandem Rolling Mill." Advanced Materials Research 562-564 (August 2012): 772–76. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.772.

Full text

Abstract:

K-WRS technology has a better edge drop control effect in cold tandem rolling mill, but it still exists some problems such as contact pressure peak beyond the limit, transition peak and the uneven distribution of contact pressure between the rolls in practical application. In this paper, tapered work roll shape is designed and optimized. The simulation analysis shows that the optimized roll shape not only can effectively control the edge drop of strip，but also can improve the contact pressure between the rolls. At the same time, it also can reduce the influence on the flatness control from the edge drop control.

APA, Harvard, Vancouver, ISO, and other styles

49

Wang, Jun Sheng, Xiao Feng Yu, Lei Song, and Sheng Li Li. "Four-High Cold Rolling Mill for Control of Edge-Drop and Thrust Force." Advanced Materials Research 145 (October 2010): 57–60. http://dx.doi.org/10.4028/www.scientific.net/amr.145.57.

Full text

Abstract:

In the paper, control principle and working characters of T－WRS&C（Taper Work Roll Shifting and Crossing）cold rolling mill are analyzed. The working schedule and control parameters are worked out. The mill working modes are determined according to different working conditions. The taper work roll shifting is used for edge drop control and the work roll crossing is used for thrust force control when work rolls shifting. The actual application verifies that the edge drop and thrust force can be controlled effectively during cold strip rolling.

APA, Harvard, Vancouver, ISO, and other styles

50

Krivtsova, Olga, Alexandr Viventsov, Vitaly Talmazan, Eugeny Panin, and Alexandr Arbuz. "Study of Deformation's Indexes of Rolls of Different Designs." Applied Mechanics and Materials 378 (August 2013): 394–96. http://dx.doi.org/10.4028/www.scientific.net/amm.378.394.

Full text

Abstract:

The elastic deformation of rolls influences the final thickness, thickness variations of strip and distribution of contact stresses. Prospective direction to address the problem of ArcelorMittal Temirtau JSC is the use of new roll materials. Calculating of elastic deformation of four-roll unit of continuous wide-strip hot rolling mill 1700 at ArcelorMittal Temirtau JSC for the actual profile of rolls of the "old", "modern" and "up-to-date" designs. Calculations have showed that during the use of rolls of "up-to-date" design AS1180HH in stands 6-8 bend deflection is reduced by 35-36.8%, and the design of rolls HVS80 in stands 9-12 by 54.5-56.1% that will allow the minimization of strip defect non-flatness at rolling of both narrow and wide strips.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Rolling mill rolls'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles