Investigation of the influence of the frequency of rotation of the rolls on the inhomogeneity of deformation during lengthwise rolling of pipes on a stub mandrel

Pavlov, D. A.; Erpalov, M. V.

doi:10.1016/j.matpr.2019.07.053

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…6, when using steel specimen the error in strain calculation is equal to 8.7%, which is lower when using aluminum specimen with a zero diameter deviation. This is due to the fact that steel has a greater slope of the stress-strain curve that enhances deformation distribution uniformity [16].…”

Section: Physical Simulationmentioning

confidence: 99%

The Influence of Cylindrical Specimen Size and Material Properties on the Distribution of Deformation during Torsion Test

Erpalov

2020

SSP

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Torsion tests allow to study the rheological properties of various materials, including properties in hot state, as well as they allow to conduct physical simulations of real material forming processes, including processes of intensive and alternating deformation. However, it is often a question what size the specimen should have to perform torsion test accurately. The article aims to study the influence of cylindrical specimen size on the distribution of deformation during torsion test. For this purpose, computer simulation of the torsion testing process was performed. The influence of the relative length of the specimen gauge on the deviation of the actual values of the effective strain from the calculated values was quantified. It is shown that the error in the calculation of the effective strain, based on the values of the twist angle and the specimen gauge size, is of 4%. In order to verify the results obtained by computer simulation, the physical simulation was performed. It is shown that the distribution of deformation along the length of the specimen gauge is also significantly influenced by the accuracy of specimen manufacture, as well as the specimen material. In some cases, the error in the calculation of the effective strain, based on the values of the twist angle and the specimen gauge size, can reach more than 80%.

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Section: Physical Simulationmentioning

confidence: 99%

The Influence of Cylindrical Specimen Size and Material Properties on the Distribution of Deformation during Torsion Test

Erpalov

2020

SSP

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“…Their early detection and elimination decreases the loss of the rolling mill. The control processes are made by the quality control services of the steelworks, but before the rolling process starts quality control services are working too (Dobrzański, 1996, Pavlov & Erpalov, 2019. It is allowed to occur on the surface of the ingots unflatten, grooves, partial melting and carriers characteristic for degassing processes.…”

Section: Defects and Incompatibilities Created Before The Rolling Promentioning

confidence: 99%

Defects and Incompatibilities of Pipes Manufactured by Pilgrim Method

Biś

Koczurkiewicz

Mazur

2019

New Trends in Production Engineering

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The increase in the quality requirements for the pipes and the increasing needs to reduce production costs, while increasing the efficiency of the process in market of hot rolled pipes are observed. One of the cost reduction factors is the reduction of the number of defects by early detection and, if possible, the removal of non-conformities. Incompatibility is an error that can be removed in accordance with the performance standard that does not cause defects (Norma API). The defect is imperfection that is so important that it is the basis for the removal of the product or its part based on the criteria set out in the performance standards. In pipe manufacturing processes, defects and batch incompatibilities can be distinguished, which arise in the steelworks during metal solidification and roll forming in the course of metal processing. The defect may also arise as a result of removing steel material or result from rolling processes defects. The paper presents the analysis of the process of quality control of pipes manufactured using the pilgrim method on the basis of real process data. The analysis were involved 1070 pieces of ingots from 11 different melts for rolling pipes. At various stages of production, discrepancies and defects were revealed, which were caused by metallurgical or technological defects associated with rolling pipes. The total amount of discrepancies and defects eliminated 168 pieces of finished pipes. The aim of the work is to show that by means of appropriately selected methods of eliminating imperfections, it is possible to increase the efficiency of the manufacturing process.

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“…Obtaining of a rough tube on a continuous mill is an important phase since the main properties which affect the quality of the finished product are laid exactly during the elongating process. The formation of the wall thickness and of the geometry of the rough tube profile in the calibers of a reeling mill determines the nature of variation in wall thickness and deviations of the geometrical parameters of the finished tube profile from the set-up parameters (Danchenko et al, 2002, Dukmasov, 2001, Pavlov & Erpalov, 2019, Reggio et al, 2002, Tang et al, 2018, Wanga et al, 2014. During continuous elongating process the deformation of the tube wall occurs between the rolls of the rolling stands and the mandrel, which moves in the direction of rolling at a given speed.…”

Section: Introductionmentioning

confidence: 99%

The Rolling Tool Development in Order to Improve the Geometry of a Tube Profile and to Reduce the Wear of Mill Rolls

Knapiński

Bobarikin

Radkin

2019

New Trends in Production Engineering

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Increasing the accuracy of the geometrical parameters of tube profiles is one of the priority areas of modern tube industry. The profile of the calibers of rolls of the reeling mill exerts a significant influence over the distribution of stresses that appear in metal during the deformation process and the process of formation of the correct geometry of the obtained rough tube. The method for determining the optimal geometry of a mill roll profile has been developed. In accordance with this method the geometry of the calibers of the continuous three roll reeling mill was calculated. The research of the influence of geometrical parameters of the calibers of mill rolls on the accuracy of the obtained tube profile, the load of the rolling tool and the wear rate of the contact surface of mill rolls and a mandrel was carried out. The numerical simulation method was chosen as a research method. This method allows to carry out rather accurate analysis and to obtain reliable results on the stress-strain and thermal states of a billet during the material processing, gives the possibility to obtain numerical values of stresses, deformations, load parameters of the process, as well as allows to visualize the results that is essential for assessing the accuracy of the tube profile geometry. Numerical experiments of the elongating process of a rough tube on the three roll continuous reeling mill with different grooving of mill rolls were carried out. It was determined that using of the developed grooving will allow to get a rough tube of a higher accuracy with the minimal deviation from the shape of the profile. The use of the developed method of calculating the geometric parameters of the calibers of the continuous reeling mill will allow to obtain calibers with a high degree of resistance to wear due to the reduction of the resistance of the flow of metal and a uniform filling of the calibers in the deformation zone. The use of this grooving of mill rolls will reduce the load acting on the rolling tool during the production of hot-deformed seamless tubes.

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Investigation of the influence of the frequency of rotation of the rolls on the inhomogeneity of deformation during lengthwise rolling of pipes on a stub mandrel

Cited by 4 publications

References 2 publications

The Influence of Cylindrical Specimen Size and Material Properties on the Distribution of Deformation during Torsion Test

The Influence of Cylindrical Specimen Size and Material Properties on the Distribution of Deformation during Torsion Test

Defects and Incompatibilities of Pipes Manufactured by Pilgrim Method

The Rolling Tool Development in Order to Improve the Geometry of a Tube Profile and to Reduce the Wear of Mill Rolls

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