scholarly journals The dynamics of the centreing mechanism of piercing mill mandrel of the pipe-rolling plant

2020 ◽  
Vol 7 (1) ◽  
pp. 51-63
Author(s):  
S.R. Rakhmanov ◽  
◽  
Yu.G. Gulyaev ◽  
S.V. Zdanevich ◽  
◽  
...  
Keyword(s):  
Mechanical System ◽  
Dynamic Model ◽  
Thickness Measurement ◽  
Piercing Mill ◽  
Pipe Rolling ◽  
Starting Point ◽  
Rod System ◽  
Rolling Plant ◽  
Steel 20 ◽  
Mill Mandrel

The paper presents the results of the vibrodiagnostics of a centering machine mechanism for holding piercing mill mandrel N1 of the pipe-rolling plant (PRP) 350. In the paper, it is established that vibration acceleration of a bearing roller lever of the centering machine mechanism for holding piercing mill mandrel during milling of an Æ282х50 mm shell, steel 20 reaches 5…12 m/s2, and of the upper roller’s vibration frequency is 33.3 Hz. The paper presents the results of the thickness measuring of the Æ282х50 shell, steel 20 after using the piercing mill N1 350. The results shows the distinctive influence of the dynamics of the milling holding mechanism rod. The system is put forth for calculating the energy-power parameters during the realization of the technical process for making shells of the required specifications in a piercing mill. The paper establishes the value of the milling axial resistance to the flow of the milled metal (taking the calibration values into account). The paper presents a refined system for making a dynamic model for the piercing bill milling holding mechanism rod with the milling calibration parameters taken fully included. A differential equation for the milling rod movement is made, specifically for the dynamic model of the PRP piercing mill mechanical system. The dynamic values of the mechanical system are refined, which is used as a starting point for solving the tasks dealing with the analysis of the PRP piercing mill milling rod’s vibroactivity state. In order to decrease rod vibroactivity levels, the paper recommends choosing rational milling calibration and to set the shell milling modes using mechanical system dynamics modelling during the corresponding stages of the design of technological processes. The paper pro-poses a scheme for modernization of the PRP 350 piercing bill exit side by switching the centering machine rod system holding bridges gear to proportional hydraulics. Keywords: piercing mill, vibration diagnostics, thickness measurement, piercing, sleeve; difference in wall thickness, energy-power parameters, calibration, mandrel, vibroactivity, dynamics, mandrel retention mechanism.

scholarly journals SOME FEATURES OF MILLS OPERATION COLD PILER PIPE ROLLING

2018 ◽  
pp. 30-35
Author(s):  
S.R. Rakhmanov
Keyword(s):  
Differential Equation ◽  
Mechanical System ◽  
Dynamic Model ◽  
Dynamic Instability ◽  
Power Line ◽  
Drive System ◽  
Design Stage ◽  
Dynamic Features ◽  
Pipe Rolling ◽  
Parametric Oscillations

Purpose. The establishment of the essence of many dynamic phenomena and the prediction of peak loads, both during the design or reconstruction stages of HPT mills and their operation using advanced calculation methods remain relevant. Methodology. An engineering technique to simplify a developed dynamic model is proposed, which includes the combination and development of known techniques. In addition, active mechanical connections in the original dynamic model of an HPT mill are identified, causing the pronounced parametric processes in the system under study. Findings. The study of the dynamics of simplified two-mass models of the HPT mill with combined parameters and periodically changing mass characteristics has been carried out. A differential equation of parametric oscillations in the drive power line has been compiled. The solution to the differential equation allows us to estimate the dynamic displacements of the considered drive of the working stand of the HPT mill for the most common modes of vibration of the mechanical system. Since the differential equations (8) are present in the formulation of the basic Cauchy problem, we implement the solution numerically, using the Runge - Kut method in the medium of a standard software product, for the most common first form of oscillations of a mechanical system. Originality. Dynamic features of the operation of the drive of the working stand of the HPT mill are presented in the form of angular displacements of the drive shaft of the mechanical system. The dynamics of the drive drive of the working stand of the HPT, 32-3 mill are calculated (pipe rolling along the route 38×3.8 → 19.1×2.1, material – steel Х18Н10Т). Practical value. The causes of the appearance of parametric oscillations in the drive system are identified and dynamic instability zones of the mechanical drive system of the HPT mill is installed, which allows for the selection of optimal rolling conditions at the design stage of technological processes. Keywords: cold rolling, pipe, mill, power line, main drive, dynamic model, simplified design scheme, mathematical model, parametric oscillations, differential equation, angular oscillations, dynamic instability.

Study of the dynamics of ТПА 350 automatic mill working stand elements

2020 ◽  
Vol 76 (8) ◽  
pp. 830-840
Author(s):  
S. R. Rakhmanov ◽  
V. V. Povorotnii
Keyword(s):  
Mechanical System ◽  
Dynamic Model ◽  
Maximum Amplitude ◽  
Calculation Scheme ◽  
Dynamic Loads ◽  
Forced Oscillations ◽  
Mass Model ◽  
Automatic Mill ◽  
Hollow Billet ◽  
Oscillation Movement

To form a necessary geometry of a hollow billet to be rolled at a pipe rolling line, stable dynamics of the base equipment of the automatic mill working stand has a practical meaning. Among the forces, acting on its parts and elements, significant by value short-time dynamic loads are the least studied phenomena. These dynamic loads arise during transient interaction of the hollow billet, rollers, mandrel and other mill parts at the forced grip of the hollow billet. Basing of the calculation scheme and dynamic model of the mechanical system of the ТПА 350 automatic mill working stand was accomplished. A mathematical model of dynamics of the system “hollow billet (pipe) – working stand” within accepted calculation scheme and dynamic model of the mechanical system elaborated. Influence of technological load of the rolled hollow billet variation in time was accounted, as well as variation of the mechanical system mass, and rigidity of the ТПА 350 automatic mill working stand. Differential equations of oscillation movement for four-mass model of forked sub-systems of the automatic mill working stand were made up, results of their digital calculation quoted. Dynamic displacement of the stand elements in the inter-roller gap obtained, which enabled to estimate the results of amplitude and frequency characteristics of the branches of the mill rollers setting. It was defined by calculation, that the maximum amplitude of the forced oscillations of elements of the ТПА 350 automatic mill working stand within the inter-roller gap does not exceed 2 mm. It is much higher than the accepted value of adjusting parameters of the deformation center of the ТПА 350 automatic mill. A scheme of comprehensive modernization of the rollers setting in the ТПА 350 automatic mill working stand was proposed. It was shown, that increase of rigidity of rollers setting in the ТПА 350 automatic mill working stand enables to stabilize the amplitude of forced oscillations of the working stand elements within the inter-rollers gap and considerably decrease the induced nonuniform hollow billet wall thickness and increase quality of the rolled pipes at ТПА 350.

Study on Thermal Operation and Design of Ring Furnace of the Pipe Rolling Plant

2019 ◽  
Vol 946 ◽  
pp. 468-473
Author(s):  
Natalia Shchukina ◽  
Nikolay Loshkarev ◽  
Vladislav Lavrov
Keyword(s):  
Fuel Consumption ◽  
Thermal Performance ◽  
Heat Balance ◽  
Rolling Stock ◽  
Pipe Rolling ◽  
High Productivity ◽  
Heating Furnaces ◽  
Brick Lining ◽  
Rolling Plant ◽  
Ring Furnace

High productivity of rolling and pipe rolling mills, good quality of finished metal products is possible to provide in the presence of powerful heating furnaces, well heating the metal with minimal oxidation and decarburization. Such conditions are provided by ring furnaces which are widely used for heating the preparations at rolling of pipes, wheels and bands of the railway rolling stock. The purpose of the heat – receiving structure of the metal, providing a set of physical and working properties, or impart to these materials the ductility required for subsequent machining. The article deals with the design and thermal performance of the ring furnace operating at ChelPipe’s Pipe Rolling Plant No.2. The problems arising during the operation of the thermal unit are analyzed. The paper describes the calculation of heating of metal and heat balance of the ring furnace. In the course of the analysis of the results of design studies, the shortcomings of the existing heat recovery system are revealed and measures for the reconstruction of the furnace to reduce fuel consumption and increase productivity (replacement of the existing brick lining with fibrous, the use of regenerative burners, the use of non-water-cooled partitions, etc.) are proposed. The paper analyzes the design and thermal performance of the ring furnace for heating of pipe billets before rolling. It shows a heat balance of the ring heating furnace and provides measures for furnace reconstruction aimed at reduction in fuel consumption and increase in efficiency: replacement of the existing lining with fiber lining, use of regenerative burners, application of non-water cooled walls.

scholarly journals RESEARCH OF THE DEFORMATION ZONE ON STEPWISE MOLDING PRESS IN CONDITIONS OF JSC “CHEREPOVETS PIPE-ROLLING PLANT”

2015 ◽  
Vol 57 (3) ◽  
pp. 49
Author(s):  
S. V. Samusev ◽  
A. V. Ljuskin ◽  
A. I. Romancov ◽  
K. L. Zhigunov ◽  
A. N. Fortunatov
Keyword(s):  
Deformation Zone ◽  
Pipe Rolling ◽  
Rolling Plant

scholarly journals RESEARCH OF DYNAMICS OF LOW FLOOR BUS / ŽEMAGRINDŽIO AUTOBUSO DINAMINIAI TYRIMAI

2016 ◽  
Vol 7 (5) ◽  
pp. 589-593
Author(s):  
Darius Vainorius ◽  
Arūras Kilikevičius ◽  
Kristina Kilikevičienė ◽  
Nikolaj Šešok ◽  
Igor Iljin
Keyword(s):  
Mechanical System ◽  
Dynamic Model ◽  
Theoretical Research ◽  
The Stability

The article describes the dynamics researches of low floor bus. The goal of research is to determine the stability of mechanical system of low floor bus. Performed the dynamic model of ½ bus which was conducted the theoretical research in Matlab environment. Darbo tyrimų tikslas – išanalizuoti žemagrindžio autobuso dinamines charakteristikas taikant virpesių lygtis. Tikslui pasiekti pirmiausia buvo sudarytas ½ autobuso sistemos dinaminis modelis ir atliktas sistemos modeliavimas žadinant realių amplitudžių reikšmėmis. Sudarytas autobuso sistemos dinaminis modelis leidžia analizuoti charakteringus ir pavojingus autobusui dinaminius virpesius.

scholarly journals Some peculiarities of the process of the pipe purse firmware on the firmware

2019 ◽  
pp. 31-39
Author(s):  
S. R. Rakhmanov
Keyword(s):  
Experimental Studies ◽  
Thickness Measurement ◽  
Power Line ◽  
Thin Wall ◽  
Piercing Mill ◽  
Drive Power ◽  
Operating Modes ◽  
Tubular Billet ◽  
Solid Works ◽  
Work Rolls

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.

scholarly journals Calculating cargo securing elements on a railway platform under the impact of a spatial force system

2019 ◽  
Vol 135 ◽  
pp. 02006 ◽  
Author(s):  
Khabibulla Turanov ◽  
Yadgor Ruzmetov ◽  
Natalia Vlasova
Keyword(s):  
Mathematical Models ◽  
Mechanical System ◽  
Physical Model ◽  
Dynamic Model ◽  
Force System ◽  
Mathematical Solution ◽  
Lateral Forces ◽  
Analytical Formulas ◽  
The Impact ◽  
Simultaneous Influence

Form a design (or dynamic) model on the basis of studying the physical model of a mechanical system (object); build mathematical models of cargo securing with inclined side surfaces of stop elements (bars) with simultaneous influence of longitudinal and lateral forces; perform a mathematical solution of the problem in the form of specific analytical formulas for calculating inclined stop bars as one of the cargo securing elements on the railway platform; make a specific example of the calculation of the forces acting on the cargo securing elements.

scholarly journals Understanding Cellular Respiration through Simulation Using Lego® as a Concrete Dynamic Model

2019 ◽  
Vol 9 (2) ◽  
pp. 72
Author(s):  
Michiel Dam ◽  
Koen Ottenhof ◽  
Carla Van Boxtel ◽  
Fred Janssen
Keyword(s):  
Complex Systems ◽  
Dynamic Model ◽  
Teaching And Learning ◽  
Conceptual Learning ◽  
Green Energy ◽  
Situational Interest ◽  
Cellular Respiration ◽  
Starting Point ◽  
Study Results ◽  
Experimental Group

Out of all the complex systems in science education curricula, cellular respiration is considered to be one of the most complex and abstract processes. Students are known to have low interest and difficulties in conceptual understanding of cellular respiration which provides a challenge for teaching and learning. In this study, we took literature about modelling and teaching and learning cellular respiration as a starting point for the design of a concrete dynamic model in which students (n = 126) use Lego® to simulate the process of cellular respiration. Students used the simulation embedded in the context of finding the efficiency of a sediment battery as a future source of green energy and we tested the effects on conceptual learning and situational interest in an experimental study. Results on conceptual learning show that both experimental and control groups had comparable results in the test. The questions that students in the experimental group asked during enactment, however, gave notice of a focus on both isolated component parts as well as modes of organization at higher organizational levels which is linked to how biologists mechanistically understand complex systems. Both groups report a similar high measure to which the topic is meaningful in real life (situational interest value), whereas the enjoyment (situational interest feeling) was significantly increased in the experimental group. Furthermore, students report specific advantages (e.g., I now understand that one acid chemically changes into another and they do not just transfer atoms) and disadvantages (e.g., time issues).

The Calculating Method of Thinning Pipes Ends before Rolling in the Reduction Mill

2020 ◽  
Vol 299 ◽  
pp. 693-698 ◽  
Author(s):  
Grigorii A. Orlov ◽  
A.G. Orlov
Keyword(s):  
Computer Simulation ◽  
Distinctive Feature ◽  
Continuous Mill ◽  
Pipe Rolling ◽  
Calculating Method ◽  
Reduction Mill ◽  
Rolling Plant ◽  
Simulation Results

In this article it is discussed one of the main directions of improving the rolling tubes technology on a pipe-rolling plant with a continuous mill, in order to reduce the pipe-ends cut. A method for preliminary end sections thinning modes, calculating during rolling on a continuous mill, to compensate for wall subsequent thickening in the reduction mill, has been developed. Method distinctive feature is the calculation of end thickening volume, which must be reduced by a specified quantity when end sections rolled. The sequence of technological calculations is given. The results of pipe reduction computer simulation by regular rolling modes, and modes calculated by the proposed method, are represented The analysis of the simulation results showed the possibility of thickened ends length reducing of at least 10%.

scholarly journals COMPREHENSIVE STUDY OF THE DYNAMICS OF THE RETAINING MECHANISM OF THE AUTOMATIC MILL

2021 ◽  
pp. 76-88
Author(s):  
Suleiman Rakhmanov ◽  
Sergey Zdanevich
Keyword(s):  
Mathematical Models ◽  
Mechanical System ◽  
Technological Process ◽  
Dynamic Models ◽  
Retention Mechanism ◽  
Dynamic Processes ◽  
Longitudinal Rolling ◽  
Automatic Mill ◽  
Rod System ◽  
Output Side

The results of the study of the dynamics of the mechanism for holding the mandrel of an automatic TPA mill are presented. The value of the axial force acting on the mandrel and the rod system of the mechanism of its holding is determined. Developed models of the mandrel retention mechanism have been developed, which made it possible to establish the nature of the development of dynamic processes on the output side of the automatic mill, taking into account the force parameters of the longitudinal rolling process of the sleeve and the parameters of the output side of the automatic mill. Mathematical models of the mandrel retention mechanism have been developed, taking into account the parameters of the technological process and the inertness of the rolled sleeve. The solution of the system of differential equations with variable coefficients is implemented numerically using the Runge-Kutta method for the corresponding dynamic models of the mandrel retention mechanism on the example of calculating the automatic mill TPA 350. The picture of the formation of dynamic processes in the mandrel retention mechanism during the implementation of the entire technological process of pipe production on an automatic mill has been clarified. taking into account the variable impact from the deformation zone and the change in the mass of the rolled sleeve. For various dynamic models, numerical solutions of problems were implemented, which made it possible to select the necessary technological and dynamic parameters of the mechanical system, to assign stable modes of rolling the sleeves on the automatic mill TPA 350. It is shown that the refined solution of the problem for three developed dynamic models of the mechanical system differs significantly from the previously known mathematical models. It has been established that the dynamics of the mechanism for holding the mandrel of the automatic TPA 350 mill is equivalent to the formation of the mechanism for the formation of different wall thickness of pipes. A mechanism for stabilizing the dynamics of the mandrel holding mechanism by separating the sections of the output side of the mill is proposed.

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