Metal flow during piercing on a helical rolling mill

The paper presents chosen aspects of the skew rolling process of hollow stepped products with the use of a skew rolling mill designed and manufactured at the Lublin University of Technology. This machine is characterized by the numerical control of spacing between the working rolls and the sequence of the gripper axial movement, which allows for the individual programming of the obtained shapes of parts such as stepped axles and shafts. The length of these zones and the values of possibly realizable cross-section reduction and obtained outlines are the subject of this research paper. The chosen results regarding the influence of the technological parameters used on the course of the process are shown in the present study. Numerical modelling using the finite element method in Simufact Forming, as well as the results of experimental tests performed in a skew rolling mill, were applied in the conducted research. The work takes into account the influence of cross-section reduction of the hollow parts and the feed rate per rotation on the metal flow mechanisms in the skew rolling process. The presented results concern the obtained dimensional deviations and changes in the wall thickness determining the proper choice of technological parameters for hollow parts formed by the skew rolling method. Knowledge about the cause of the occurrence of these limitations is very important for the development of this technology and the choice of the process parameters.

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The Effect of Process Parameters in Helical Rolling of Balls on the Quality of Products and the Forming Process

Materials ◽

10.3390/ma11112125 ◽

2018 ◽

Vol 11 (11) ◽

pp. 2125 ◽

Cited By ~ 4

Author(s):

Janusz Tomczak ◽

Zbigniew Pater ◽

Tomasz Bulzak

Keyword(s):

Metal Flow ◽

Experimental Tests ◽

Rolling Process ◽

Helical Rolling ◽

Forming Process ◽

University Of Technology ◽

Quality Of Products ◽

Skew Rolling

This paper presents selected numerical and experimental results of a skew rolling process for producing balls using helical tools. The study investigates the effect of the billet’s initial temperature on the quality of produced balls and the rolling process itself. In addition, the effect of billet diameter on the quality of produced balls is investigated. Experimental tests were performed using a helical rolling mill available at the Lublin University of Technology. The experiments consisted of rolling 40 mm diameter balls with the use of two helical tools. To determine optimal rolling parameters ensuring the highest quality of produced balls, numerical modelling was performed using the finite element method in the Forge software. The numerical analysis involved the determination of metal flow kinematics, temperature and damage criterion distributions, as well as the measurement of variations in the force parameters. The results demonstrate that the highest quality balls are produced from billet preheated to approximately 1000 °C.

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The Effect of the Deformation Method of the Billets on Mechanical Properties of Molybdenum Bars and Wire

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.864.204 ◽

2020 ◽

Vol 864 ◽

pp. 204-210

Author(s):

Sergey Gorbatyuk ◽

Dmitry Efremov ◽

Sergei Albul ◽

Natalya Kirillova

Keyword(s):

Mechanical Properties ◽

Comparative Analysis ◽

High Temperatures ◽

Rolling Mill ◽

Mechanical Characteristics ◽

New Technology ◽

Deformation Resistance ◽

Helical Rolling ◽

Deformation Method ◽

High Deformation

A procedure has been developed for calculating the geometric, kinematic and energy-power parameters of helical rolling, which allows a comparative analysis of the processes carried out in stands of various designs. Based on the results of this analysis, a helical rolling mill was designed and manufactured which allows to roll materials with high deformation resistance at high temperatures. The results of the study of the mechanical characteristics of molybdenum bars and wires made by new technology are presented.

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Drive Roller Shoes in Helical Rolling Mill for Seamless Steel Pipes

Transactions of the Iron and Steel Institute of Japan ◽

10.2355/isijinternational1966.28.148 ◽

1988 ◽

Vol 28 (2) ◽

pp. 148-148

Keyword(s):

Rolling Mill ◽

Helical Rolling ◽

Steel Pipes ◽

Drive Roller ◽

Seamless Steel

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The Influence of Rolling Temperature on the Energy and Force Parameters during Normalizing Rolling of Plain Round Bars

Materials Science Forum ◽

10.4028/www.scientific.net/msf.638-642.2628 ◽

2010 ◽

Vol 638-642 ◽

pp. 2628-2633 ◽

Cited By ~ 1

Author(s):

Konrad Błażej Laber ◽

Henryk Dyja ◽

Sebastian Mróz

Keyword(s):

Final Stage ◽

Rolling Mill ◽

Metal Flow ◽

Experimental Studies ◽

Three Dimensional ◽

Rolling Process ◽

Constructional Steel ◽

Bar Rolling ◽

Shape Mill ◽

Rolling Technology

The paper presents results of theoretical and experimental studies on the influence of strip temperature reduction at the final stage of the normalizing rolling process in a continuous bar rolling mill on the energy and force parameters. The studies were carried out for 38 mm-diameter round bars of constructional steel S355J2G3 (St52-3 acc. to DIN). At the first stage, numerical modelling of the rolling process was performed for the conditions of the currently used rolling technology. The aim of this stage of the work was to determine the distribution of strip temperature during the rolling process and of strip temperature after the rolling process. The obtained computation results were compared with the measurement results recorded during the actual rolling process using a thermovision camera. A computer program designed for three-dimensional modelling of metal flow during rolling in passes was used for the determination of the distribution of strip temperature during rolling. The second stage of the studies included modelling of the bar rolling technology modified by applying normalizing rolling after introducing accelerated strip cooling at the final stage of rolling. The aim of this stage of the work was to establish the influence of reduced strip temperature on the change in the values of the energy and force parameters of the process. By comparing the computed values of rolling power with those of the permissible power it was found that these values were lower than the permissible power of the rolling machine’s main drives installed in the Rolling Mill under analysis. Thus, it was demonstrated that it was possible to implement the process of normalizing rolling in the conditions of the Shape Mill under study.

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Design and technological capabilities of a CNC skew rolling mill

Archives of Civil and Mechanical Engineering ◽

10.1007/s43452-021-00205-7 ◽

2021 ◽

Vol 21 (2) ◽

Author(s):

Janusz Tomczak ◽

Zbigniew Pater ◽

Tomasz Bulzak ◽

Konrad Lis ◽

Tomasz Kusiak ◽

...

Keyword(s):

Rolling Mill ◽

Performance Test ◽

Metal Flow ◽

Fem Analysis ◽

Rolling Process ◽

Design Solution ◽

Test Results ◽

Rolling Method ◽

Mill Stand ◽

Skew Rolling

AbstractResults of a study investigating a skew rolling process for elongated axisymmetric parts are presented. Despite the fact that the skew rolling technique for producing such parts was developed and implemented in the mid-twentieth century, there are no studies on this problem. The first part of this paper presents the results of FEM modelling of skew rolling stepped axles and shafts (solid and hollow). The FEM analysis was performed using the MSC Simufact Forming software. The numerical simulation involved the determination of metal flow patterns, the analysis of thermal parameters of the material during rolling, and the prediction of cracking by the Cockcroft-Latham ductile fracture criterion. Force parameters of rolling solid and hollow parts were also determined. The aim of the FEM analysis was to determine initial design assumptions and parameters for the development of the skew rolling mill. Later on in the paper, a design solution of a CNC skew rolling mill for rolling parts based on their envelope profile is proposed. FEM strength test results of a mill stand, obtained with MSC. NASTRAN, are presented. Finally, the performance test results of the constructed rolling mill are presented. The experiments involved rolling real stepped shafts that were modelled numerically. Obtained results show that the proposed skew rolling method has considerable potential. The designed and constructed rolling mill can be used to perform the rolling process according to the proposed method, with the tool and material kinematics being controlled based on the set parameters of a workpiece envelope.

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Study of wear of cylindrical plugs of a helical rolling mill

Chernye Metally ◽

10.17580/chm.2021.06.05 ◽

2021 ◽

pp. 27-31

Author(s):

A. S. Aleshchenko ◽

Nguen Kuang

Keyword(s):

Rolling Mill ◽

Helical Rolling

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Calculation of Rolling Force of 3700mm Cylindrical Shell Rolling Mill

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.572.19 ◽

2012 ◽

Vol 572 ◽

pp. 19-24

Author(s):

Su Wen Chen ◽

Hong Min Liu ◽

Yan Peng ◽

Jian Liang Sun ◽

Bin Bin Sun

Keyword(s):

Cylindrical Shell ◽

Deformation Zone ◽

Rolling Mill ◽

Rolling Force ◽

Metal Flow ◽

Force Model ◽

Equilibrium Equations ◽

Stress Equilibrium ◽

Slip Area ◽

Good Agreement

Rolling force is an important technological parameter in designing of the 3700mm cylindrical shell rolling mill. Due to the characteristics of double driving rolls and asynchronous rolling of 3700 mm cylindrical shell rolling mill, the force analysis of the deformation zone is complex. In this study, an analytic method was used to calculate the rolling force. The deformation zone was divided into the forward slip area, the backward slip area and the rub rolling area on the basis of metal flow velocity. The stress equilibrium equations of each area were built. Then the rolling force model of the 3700mm cylindrical shell rolling mill was built and solved, according to the boundary conditions. At the same time, in order to verify the validity of the analysis, the calculated values were compared with the measured in the spot. They have a good agreement, which indicates the calculation accuracy of the model could meet the industry requirements.

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