scholarly journals Complex study of deformation mode of working stand of pipes cold rolling mill

2018 ◽  
pp. 93-100
Author(s):  
S. R. Rakhmanov ◽  
V. V. Povorotniy
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Rational Design ◽  
Deformation Mode ◽  
Cold Rolling Mill ◽  
Rolling Mills ◽  
Complex Study ◽  
Cold Rolling Mills

Elaboration of main concepts of working stands reconstruction, providing an increase of their operation strength and improving of rolled pipes quality and at the same time a decrease of metal intensity is an actual task. Solving of the task will result to a great extent in expanding of technological possibilities and increasing of productivity pipe cold rolling mills.Results of complex study of deformation mode of working stands of pipe cold pilger mills of different designs presented. Influence of working stands parameters both existing and of rational designs on quality of rolled pipes determined. The study determined, that thanks to application of roller installation with ring roll passes and new bearings an expansion of technological possibilities of ХПТ 32 mill reached. Increase of rolled pipes quality was reached by utilization in the drive line of ХПТ 32 mill a modernized working stand of rational design, which has a high operation reliability and an increased rigidity.

More from the Mill

2000 ◽  
Vol 122 (10) ◽  
pp. 82-87
Author(s):  
Michael Valenti
Keyword(s):  
Cold Rolling ◽  
Control Systems ◽  
Rolling Mill ◽  
Space Shuttle ◽  
State Of The Art ◽  
Steel Strip ◽  
Cold Rolling Mill ◽  
Automated Control ◽  
The World

This article focuses on the launch of Sputnik that transfixed the world by Carpenter Technology Corp. By incorporating advanced processing equipment, including a rolling mill, shape controller, annealing furnaces, wet grinders, and leveler with state-of-the-art automated control systems, Carpenter has improved the productivity and quality of its high value strip at a time when Space Shuttle launchings are taken in stride. The Carpenter specialty strip facility installed a cold rolling mill designed by Joseph Frohling GmbH of Olpe, Germany, in November last year, to increase rolling capacity and guarantee that the steel strip it produces meets the desired shape and thickness. In the Frohling mill, strip passes between two working rolls that reduce its thickness to sizes between 0.150 and 0.008 inch, at speeds up to 1500 feet per minute. Carpenter also installed three Ebner vertical annealing furnaces. Coiled strip on mandrels is unwound through each furnace, annealed, then rewound continuously to promote productivity.

Study on the Shifting Model of Edge Drop Control in Ultra-Wide 6-High Tandem Cold Rolling Mill

2012 ◽  
Vol 452-453 ◽  
pp. 1257-1261 ◽  
Author(s):  
Jian Guo Cao ◽  
Yan Lin Wang ◽  
Hong Bo Li ◽  
Mu Qing Song ◽  
Sheng Hui Jia ◽  
...  
Keyword(s):  
Finite Element ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Work Roll ◽  
Cold Rolling Mill ◽  
Tandem Cold Rolling ◽  
Cold Rolling Mills ◽  
Important Quality ◽  
Control Work ◽  
Edge Drop

Edge drop is an important quality evaluating index for strip cross-section with the increasing of requirement for higher gauge accuracy to meet customer's demand. The mathematical model of roll shifting system plays an important role in controlling the edge drop on modern tandem cold rolling mills. Based on the explicit dynamic finite element method, a 3D finite element simulation model of rolls and strip is established for a large ultra-wide 6-high cold rolling mill with the developed EDW (edge drop control work roll) and the matched CVC intermediate roll to investigate the effect of work roll shift on edge drop of strip. Considering on the characteristics of EDW work rolls, equivalent area compensated method has been put forward to build the shifting model for edge drop control. The results indicated that the values of edge drop are less than 7μm by using the proper shifting model and the shifting model can be used to guide the practical production.

Simulation on Hydraulic-Mechanical Coupling Vibration of Cold Strip Rolling Mill Vertical System

2013 ◽  
Vol 694-697 ◽  
pp. 407-414 ◽  
Author(s):  
Hai Sheng Liu ◽  
Jie Zhang ◽  
Kai Fu Mi ◽  
Jun Xia Gao
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Motor Behavior ◽  
Strip Rolling ◽  
Work Condition ◽  
Coupling Vibration ◽  
Rolling Mills ◽  
Mechanical Coupling ◽  
Hydraulic Machinery ◽  
Cold Rolling Mills

Based on vibration problems of a six roller cold rolling mill, hydraulic-machinery coupling vibration system dynamic model of the 2180mm 4-stand tandem cold rolling mills was built integrated the software of MATLAB and ADAMS and simulated. The simulation result was consistent with that of the field test data revealed by rolling mill vibration. Through the comparison of the vertical systems motion displacement, velocity, acceleration under the different work condition, coupling vibration causes and evolution mechanism was analyzed, that had practical value to further control mill motor behavior.

Supplementary Setting of Target Flatness Curves for 1450 Strip Cold Rolling Mill

2014 ◽  
Vol 633-634 ◽  
pp. 800-803
Author(s):  
Hai Zhou ◽  
Jin Lan Bai
Keyword(s):  
Cold Rolling ◽  
Orthogonal Polynomials ◽  
Rolling Mill ◽  
Temperature Compensation ◽  
Parameter Setting ◽  
Cold Rolling Mill ◽  
Actual Production ◽  
Original Target ◽  
Flatness Control

In this paper, for the original target flatness curves of flatness control system of a 1450 cold rolling mill can't satisfy the actual production, parameter setting method is adopted to the supplementary setting of target flatness curves. Based on the analysis of the several common forms of orthogonal polynomials, Legendre orthogonal polynomials are selected in supplementary setting according to the actual flatness. Considering temperature compensation, recoiling compensation, edge compensation, and comprehensive control of flatness and crown, 18 supplementary setting target flatness curves is determined aimed at typical product of the mill. Actual production shows that after the supplementary setting target flatness curves put into use, the flatness quality of the product has improved significantly.

A Setup Calculation Method of Application Platform for Process Сontrol System of Tandem Cold Rolling Mills

2016 ◽  
Vol 850 ◽  
pp. 494-501 ◽  
Author(s):  
Jin Shan Chen ◽  
Chang Sheng Li
Keyword(s):  
Control System ◽  
Process Control ◽  
Cold Rolling ◽  
Calculation Method ◽  
Process Control System ◽  
Rolling Mills ◽  
Tandem Cold Rolling ◽  
Cold Rolling Mills ◽  
Calculation Module

Setup calculation function of the process control system for tandem cold rolling mills not only determinates the dimension accuracy of finished strip materials directly, but also affects the control of surface quality of strip materials. In the present work, an attempt was made to develop a new setup calculation method for tandem cold rolling mills to maximize the throughput and improve the surface quality of strips. Based on the application platform for level-2 process control system, the modular design method was adopted, and then the setup calculation function was developed. And four functional modules consisting of preset preparation module (PPM), basic setup calculation module (BSCM), dynamic setup calculation module (DSCM), and adaptive calculation module (ACM) were developed. The preset data from PPM were used in equipment of level-1 process control system, and the purposes of BSCM was to achieve high quality of products, reduce off thickness deviation and achieve stable rolling at maximum possible rolling speed for raising productivity. In order to minimize off error of preset and actual data, DSCM was provided. Thanks to the design of ACM, accuracy of mathematical model can be effectively improved on line. Ultimately, the precise model on setup calculation method for cold tandem rolling of strip steels was established, and then it was put into practical production. Statistics analysis showed that the measured data was in excellent agreement with the model, and exactly, the relative deviations on rolling force and delivery thickness of strips were less than 3.67% and 0.42%, respectively. The new setup calculation method has high precision and good generalization capability.

scholarly journals Robust Tension Control of Strip for 5-Stand Tandem Cold Mills

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Behrooz Shafiei ◽  
Mohsen Ekramian ◽  
Khoshnam Shojaei
Keyword(s):  
Cold Rolling ◽  
Rolling Process ◽  
Tension Control ◽  
External Disturbances ◽  
Rolling Mills ◽  
Tandem Cold Rolling ◽  
Cold Rolling Mills ◽  
Hankel Norm ◽  
Norm Approximation

Tandem cold rolling process is a nonlinear complex system with external and internal uncertainties and significant disturbances. The improvement in the quality of the final output depends on the control strategy of centerline thickness and interstand tension. This paper focuses on interstand tension control problem in 5-stand tandem cold rolling mills. Tension dynamics can be described by a nominal model perturbed by parametric uncertainties. In order to overcome the model uncertainties and external disturbances, suboptimalH∞andμcontrollers are proposed and the Hankel-norm approximation is used to reduce the order ofμcontroller. The performance of the proposed controllers is demonstrated by some simulations.

Sizing Design for 4-High Cold Rolling Mills

2014 ◽  
Author(s):  
Andrew W. Nelson ◽  
Feng Zhang ◽  
Arif S. Malik ◽  
Mark E. Zipf
Keyword(s):  
Cold Rolling ◽  
Rolling Mill ◽  
Design Approach ◽  
Rolled Sheet ◽  
Rolling Mills ◽  
Roll Bending ◽  
Multidisciplinary Analysis ◽  
Cold Rolling Mills ◽  
Flatness Control ◽  
Geometric Quality

As the demand for thin and ultra-thin gage for cold-rolled sheet metals increases, cold rolling manufacturers and sheet metal producers must utilize technological advancements to stay competitive globally. To manufacture a competitive rolling mill, the mill designer must identify an appropriate mill configuration, roll sizes, and flatness control systems, etc. The design must be robust enough to accommodate broad product envelopes containing strips of different widths, gages, and materials. At the same time, the mill “sizing” must be competitive by avoiding over- or under-design. These two objectives, designing a robust mill and remaining competitive, tend to conflict, which establishes the need for optimal mill design based on rigorous multidisciplinary analysis. Conventionally, mill design is done using a ‘sequential’ design approach relying heavily on experience. The major limitation of sequential mill design is that it can lead to over-design or under-design since it segregates design tasks for the coupled components, making it difficult to consider many combinations of the design space. The result is a ‘feasible’ rather than ‘optimum feasible’ mill design. This work applies nonlinear programming to optimize the basic design of a 4-high reversing cold rolling mill, subject to static strength, fatigue, and strip geometric quality constraints. The work offers an improved multi-disciplinary design approach based on stress and fatigue analysis of rolls, and an efficient strip profile/flatness analysis to identify suitable design limits for roll bending devices.

scholarly journals Experimental methodology for tinplate rolling on a laboratory mill

2019 ◽  
Vol 110 ◽  
pp. 01001 ◽  
Author(s):  
Iryna Karmazina ◽  
Volodymyr Kukhar ◽  
Elena Balalayeva ◽  
Alla Larkina ◽  
Valentina Kashintseva
Keyword(s):  
Cold Rolling ◽  
Experimental Research ◽  
Rolling Process ◽  
Optimal Combination ◽  
Experimental Methodology ◽  
Rolling Mills ◽  
Steel Base ◽  
Cold Rolling Mills ◽  
Deformation Modes

The review of cold rolling mills used for the production of tinplate and thin tinplate in the world is presented. World tinplate production is characterized by the desire to reduce the thickness of its steel base. In connection with the variety of tinplate rolling mills, peculiarities of the deformation conditions of thin tinplate, complexity of the technological process and theoretical prediction of the rolling process indices, especially in terms of the theoretical model universality, as well as paucity of existing practical data, the necessity of experimental research is substantiated. Experimental research methodology of energy and force modes for tinplate and thin tinplate rolling for different cold rolling mills: five-, six- and seven-stand, was developed. Deformation modes have been developed that allow simulating the process of continuous cold rolling of tinplate with a thickness of 0.16 mm and 0.28 mm in five-, six- and sevenstand mills, respectively. The technical characteristics of industriallaboratory equipment involved in experimental research are presented. The results of the chemical composition and mechanical properties investigation of the initial blank are presented. Experimental research of energy and force modes for tinplate rolling at different parameters of cold rolling mills using the developed methodology will determine their optimal combination, as well as justify the choice of rolling equipment in terms of energy efficiency of the rolling process and the quality of the strip.

New Industrial Shape Detecting Equipment of Cold Strip

2013 ◽  
Vol 313-314 ◽  
pp. 677-680
Author(s):  
Bing Qiang Yu ◽  
Li Po Yang
Keyword(s):  
Signal Processing ◽  
Cold Rolling ◽  
Rolling Mill ◽  
Shape Control ◽  
Control Model ◽  
Cold Rolling Mill ◽  
Rolling Strip ◽  
Shape Detecting

Shape has a significant impact on the good quality of follow-up deep-processed steel products. But it is difficult to detect, so a shape detecting equipment of cold rolling strip is developed to meet industrial application, which mainly consist of the shape detecting roller, the collecting ring, the DSP shape signal processing board and the shape control model. The shape detecting system was successfully used in 1250 mm HC 6-high reversible cold rolling mill. The precision of shape detecting is 0.2 I.

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