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

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.

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 The rolling radius determining method for longitudial tube rolling

2019 ◽  
Vol 1 (1) ◽  
pp. 35-40
Author(s):  
Gulyaev Yu ◽  
Shyfrin Ye ◽  
Frolov Ya
Keyword(s):  
Deformation Zone ◽  
Neutral Line ◽  
Rolling Direction ◽  
Symmetry Plane ◽  
Horizontal Projection ◽  
Longitudinal Rolling ◽  
Pipe Rolling ◽  
The Real ◽  
True Shape ◽  
Applied Forces

A generalized method for determining the rolling radius was developed. It based on analysis of the real form of the neutral line in the deformation zone.The assumption that the neutral plane is parallel to the rolling gauge plane of sym-metry is mostly applied in analytical determination of the conventional rolling radius at longitudinal rolling in round gauges (including rolling reduction of pipes). According to that assumption, the horizontal projection of the conventional neutral line to the perpendbcular plane is a straight line parallel to the axis of rolling. The true shape of border between the lead and lag zones (real neutral line) represents a spatial curve not parallel to the symmetry plane. And it`s horizontal projection onto the perpendbcular plane is flat curve. The equation determining its shape on this plane can be determined by considering the condition the balance of the metal inside the deformation zone under the action of applied forces. The rolling radius calculated using that equation is called the real rolling radius. Presented in this study calculations show no significant influence of the friction factor f on the ratio within f values range 0.25…0.5. Such range meets the real conditions at longitudinal pipe rolling. External axial force directed forwards to rolling direction also don`t change the ratio significantly. Over against, the backward directed external force and greater rolls diameter lead to alignment of conventional and real rolling radiuses. Increase of the diameter reduction as well as an increasing of the relative wide of the groove elevates the ratio. Same effect provides the higher wall thickness in the entrance to deformation zone. Empiric equation for ratio determining at mostly used conditions of longitudinal pipe rolling obtained in this study allows to correct rolls drive velocity to provide best stress conditions inside the deformation zone.

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.

C. Liebknecht Nizhnedneprovsk pipe-rolling plant completes 75 years

Metallurgist ◽  
1971 ◽  
Vol 15 (7) ◽  
pp. 429-431
Author(s):  
A. T. Esaulov
Keyword(s):  
Pipe Rolling ◽  
Rolling Plant

Simulation of vibration piercing of pipe blank at press

2020 ◽  
Vol 76 (11) ◽  
pp. 1128-1138
Author(s):  
S. R. Rakhmanov
Keyword(s):  
High Frequency ◽  
Deformation Zone ◽  
Pipe Blank ◽  
Equipment Operation ◽  
Metal Deformation ◽  
Technological Tool ◽  
High Frequency Vibrations ◽  
Pipe Blanks ◽  
Wave Phenomena

In some cases, the processes of piercing or expanding pipe blanks involve the use of high-frequency active vibrations. However, due to insufficient knowledge, these processes are not widely used in the practice of seamless pipes production. In particular, the problems of increasing the efficiency of the processes of piercing or expanding a pipe blank at a piercing press using high-frequency vibrations are being solved without proper research and, as a rule, by experiments. The elaboration of modern technological processes for the production of seamless pipes using high-frequency vibrations is directly related to the choice of rational modes of metal deformation and the prediction resistance indicators of technological tools and the reliability of equipment operation. The creation of a mathematical model of the process of vibrating piercing (expansion) of an axisymmetric pipe blank at a piercing press of a pipe press facility is an actual task. A calculation scheme for the process of piercing a pipe plank has been elaborated. A dependence was obtained characterizing the speed of front of plastic deformation propagation on the speed of penetration of a vibrated axisymmetric mandrel into the pipe workpiece being pierced. The dynamic characteristics of the occurrence of wave phenomena in the metal being pierced under the influence of a vibrated tool have been determined, which significantly complements the previously known ideas about the stress-strain state of the metal in the deformation zone. The deformation fields in the zones of the disturbed region of the deformation zone were established, taking into account the high-frequency vibrations of the technological tool. It has been established that the choice of rational parameters (amplitude-frequency characteristics) of the vibration piercing process of a pipe blank results in significant increase in the efficiency of the process, the durability of the technological tool and the quality of the pierced blanks.

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