Seamless Pipes Manufacturing Process Improvement Using Mandreling

2021 ◽  
Vol 316 ◽  
pp. 402-407
Author(s):  
Aleksander V. Goncharuk ◽  
Viktor A. Fadeev ◽  
Maksim V. Kadach
Keyword(s):  
Rolling Mill ◽  
Cold Treatment ◽  
Internal Surface ◽  
Screw Rolling ◽  
Pipe Rolling ◽  
Rolling Mills ◽  
Metal Deformation ◽  
Screw Rolling Mill ◽  
Hot Rolled ◽  
Positive Effect

The paper discusses the specific aspects of hot rolled seamless pipes manufacture using pipe rolling plants including screw-rolling mills. The method of accuracy enhancement of pipe dimensions, as well as external and internal surface quality improvement, is proposed. The article specifies the results of computer and physical modeling of the pipes mandreling process. The application of the mandreling process within the cage using different diameter mandrels is shown. We managed to decrease the typical mark caused by the metal deformation, due to the screw-rolling mill and to manufacture pipes with more accurate dimensions, as a result of the mandreling process modeling. The results of the physical experiment on mandreling the shell pierced at the screw-rolling mill showed a positive effect from the process of hollow billet cold treatment using the mandrel.

FEM-Based Comparison of Mandrel Wear Resulting from Elongation of Pipes Manufactured from Various Materials on a Two-Roll Screw Rolling Mill

2022 ◽  
Vol 1049 ◽  
pp. 96-101
Author(s):  
Quang Nguyen ◽  
Alexander Sergeevich Aleshchenko
Keyword(s):  
Finite Element Method ◽  
Stainless Steel ◽  
Rolling Mill ◽  
The Finite Element Method ◽  
Screw Rolling ◽  
Pipe Rolling ◽  
Steel Pipes ◽  
Stainless Steel Pipe ◽  
Materials Used ◽  
Screw Rolling Mill

The present article discusses the cylindrical mandrel wear change during rolling using MISIS - 130 D mill depending on the type of rolled billets materials used. The research on the mandrel wear of the screw rolling mill during pipes elongation was carried out using the finite element method (FEM). The results of the wear modeling showed that the depth of the metal removed on the mandrel surface during stainless steel pipes elongation was higher as compared to alloyed and carbon steel pipes. The significant wear of the mandrel during stainless steel pipe rolling can be explained by the rise in the applied metal force resulting from the introduction of alloying components such as chromium and nickel into rolled billets materials. Consequently, the obtained modeling results can allow predicting the service life of working tools.

scholarly journals SCREW ROLLING OF PIPES IN A FOUR-HIGH ROLLING MILL

2019 ◽  
Vol 62 (9) ◽  
pp. 686-690
Author(s):  
B. A. Romantsev ◽  
E. A. Kharitonov ◽  
A. S. Budnikov ◽  
Van Chong Le ◽  
Ba Khyui Chan
Keyword(s):  
Cross Section ◽  
Wall Thickness ◽  
Cross Sections ◽  
Rolling Mill ◽  
Program Assessment ◽  
The Finite Element Method ◽  
Screw Rolling ◽  
Pipe Rolling ◽  
Feed Angle ◽  
Screw Rolling Mill

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.

Design of modernization of control valves for the counter-bending forces regulation in finishing mill

2017 ◽  
Vol 2 (80) ◽  
pp. 56-64
Author(s):  
E. Evin ◽  
J. Tkáčová ◽  
Z. Lengyel
Keyword(s):  
Control System ◽  
Rolling Mill ◽  
Rolled Strip ◽  
Rolling Mills ◽  
Control Valves ◽  
Integrated Electronics ◽  
Finishing Mill ◽  
Position Controller ◽  
Hot Rolled

Purpose: The aim of this paper is design of modernization of control valves of finishing mill to control the counter-bending forces on the last stands by replacement of proportional valves with regulating ones. Design/methodology/approach: New board (construction, location and arrangement of valves) was designed, model of which was constructed by SolidWorks software. Findings: The solution was oriented to optimization by replacement of proportional valves for regulating ones to control the counter-bending forces on the rolling mills. The selected types of proportional and regulating valves were compared. The main advantage of the application of regulating valves is integrated electronics with position controller for pilot valve control and position feedback disposal. Based on the parameters of the regulating valve the new respite and relief valves were designed. Research limitations/implications: Design of substitution of upper and lower blocks of control valves and modelling the motherboards using SolidWorks software was conditional by dimensions of currently used hydraulic components and dimensions of the proposed valves. Designed blocks ensure the functioning of the control system of counter bending of working rolls. In the future the perspective to control the counterbending forces can be carried out by innovation of the rolling mill by pump control using asynchronous converters and/or by changing the structure of the arrangement of rolling mill and by design of CVC control of the rolling mill. Practical implications: New board (construction, location and arrangement of valves) was designed, model of which was constructed by SolidWorks software. Designed board ensures the functioning of the control system for counter-bending of working rolls. Originality/value: The result of the proposed solutions is increasing the quality of the hot rolled strip i.e. reduction of the strip waviness and keeping the cross section of the strip.

scholarly journals Influence of deoxidizing powder on the internal surface of hot-rolled pipes

2019 ◽  
pp. 61-65
Author(s):  
O. V. Rozhkova
Keyword(s):  
Chemical Composition ◽  
Technological Process ◽  
Internal Surface ◽  
Metallographic Analysis ◽  
Pipe Rolling ◽  
Hollow Billet ◽  
Inner Surface ◽  
Hot Rolled

The article describes the experience of using deoxidizing powder in the technological process of production of hot-rolled seamless pipes; the processes that occur when applying to the inner surface of the hollow billet deoxidizing powder. The results of experimental and industrial tests of deoxidizing powder of different chemical composition are presented. The influence of the chemical composition of the deoxidizing powder on the formation of defects on the inner surface of the pipes is shown. Describes the stages of metallographic analysis of the defects on the inner surface of the pipe, provided the reasons for the formation of the defect «pipe rolling lap (skin)».

Computer Simulation of Piercing in a Four-High Screw Rolling Mill

Metallurgist ◽  
2018 ◽  
Vol 61 (9-10) ◽  
pp. 729-735 ◽  
Author(s):  
B. A. Romantsev ◽  
M. M. Skripalenko ◽  
Tran Ba Huy ◽  
M. N. Skripalenko ◽  
Yu. A. Gladkov ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Rolling Mill ◽  
Screw Rolling ◽  
Screw Rolling Mill

scholarly journals METAL FORMING DURING PIPES REDUCTION ON A THREE-HIGH ROLLING MILL

2019 ◽  
Vol 62 (10) ◽  
pp. 756-762 ◽  
Author(s):  
A. S. Aleshchenko ◽  
A. S. Budnikov ◽  
E. A. Kharitonov
Keyword(s):  
Metal Forming ◽  
Deformation Zone ◽  
Rolling Mill ◽  
Axial Direction ◽  
Rolling Process ◽  
Pipe Plant ◽  
Thin Wall ◽  
Screw Rolling ◽  
Traditional Use ◽  
Rolling Mills

 Pipe rolling plants (PRP) with three-high screw rolling mills are  used to produce hot-rolled seamless pipes. In Russia, two such rolling  units are used: PRP 160 at Pervouralsk Novotrubny Plant and PRP  200  at Volzhsky Pipe Plant. Recently, the most acute issue is increasing their  technological capabilities. There is a need of expanding size and grade  mix, as well as non-traditional use of gauge and rolling mill for screw  rolling. The paper presents results of experimental study of the process  of reduction or un-adjusting rolling of pipes on three-high screw rolling  mills with an increase in reduction of diameter up to 25  %. The results  of computer finite element modeling in QFORM program are provided.  The aim of this work was to study effect of rolling process with increased  reduction in diameter on change of metal form in deformation zone and  changes in geometrical dimensions at reduction of cups with different  wall thickness on the pilot mill. Important role in process of metal forming during screw rolling (especially when rolling hollow products and  pipes) plays cupped blank ovality that is equal to the ratio of the roll  radius when the metal comes in contact with the roller to the radius under  the roller in the cross section of deformation zone. Ovality characterizes  stability of change in geometric dimensions of pipes and their resistance  to deformation in inter-roll space. The reduction of thin-wall cupped  blank is accompanied by large va lues of ovality, deformation process is  less stable, and as a result, form defects (faceting) and end defects occur  during plug rolling. Ovality at plug rolling increases more intensely in  comparison with plugless rolling. Presence of plug limits displacement  of metal in axial direction and contributes to displacement of metal in  gaps between rollers. At plugged rolling, it is necessary to use rolls with  collars allowing main reduction along the wall, thereby localizing reduction zone on the plug, and reducing ovality of cupped blanks.

Pipe behavior in a three-roller screw-rolling mill

2014 ◽  
Vol 44 (10) ◽  
pp. 769-772 ◽  
Author(s):  
E. A. Kharitonov ◽  
V. P. Romanenko ◽  
A. S. Budnikov
Keyword(s):  
Rolling Mill ◽  
Screw Rolling ◽  
Roller Screw ◽  
Screw Rolling Mill
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