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Lundberg, Sven-Erik
Publications (10 of 35) Show all publications
Hadad, R., Lindgren, P., Jonsson, M. & Lundberg, S.-E. (2009). A Theoretical / Empirical study of void closure in heavy plate hot rolling of tool steel. Metallurgy and New Materials Researches / Cercetari metalurgice, si de noi materiale, 17(1), 9-26
Open this publication in new window or tab >>A Theoretical / Empirical study of void closure in heavy plate hot rolling of tool steel
2009 (English)In: Metallurgy and New Materials Researches / Cercetari metalurgice, si de noi materiale, ISSN 1221-5503, Vol. 17, no 1, p. 9-26Article in journal (Other academic) Published
Abstract [en]

By the introduction of TOOLOX®, SSAB in Oxelösund has turned into a new market segment, including heavier sizes and dramatically increased requirements on inner quality of the plate. To be able to determine the minimum reduction from slab to finished plate with acceptable inner quality, a study was made, to evaluate the minimum reduction for a given requirement of inner quality. By experimental rolling in the heavy plate mill in Oxelösund it has been proven that more than 40 % total reduction is necessary for total closure of voids under the geometrical deformation conditions in that mill. The total reduction is more important than the geometrical rolling conditions, and heavy pass reductions are favourable for void closure. The closure of internal defects can be improved by cooling the surface of the slabs.

Place, publisher, year, edition, pages
Bucarest: Societatea Româna de Metalurgie, 2009
National Category
Engineering and Technology Metallurgy and Metallic Materials
Research subject
Industrial Measurement Technology
Identifiers
urn:nbn:se:oru:diva-8417 (URN)
Note

Cercetari Metalurgice si de noi Materiale currently does not have a website.(2017-03-08)

Available from: 2009-10-30 Created: 2009-10-30 Last updated: 2017-10-18Bibliographically approved
Överstam, H. & Lundberg, S.-E. (2008). A new approach to roll force and torque modelling in wire rod and bar mills. Der Kalibreur, 69, 61-72
Open this publication in new window or tab >>A new approach to roll force and torque modelling in wire rod and bar mills
2008 (English)In: Der Kalibreur, ISSN 0022-796X, Vol. 69, p. 61-72Article in journal (Refereed) Published
National Category
Engineering and Technology Metallurgy and Metallic Materials
Research subject
Mechanical Engineering
Identifiers
urn:nbn:se:oru:diva-8415 (URN)
Available from: 2009-10-30 Created: 2009-10-30 Last updated: 2017-10-18Bibliographically approved
Lundberg, S.-E. (2007). A Model for Prediction of Roll Force and Torque in Edge Rolling. Steel Research International, 78(2), 160-166
Open this publication in new window or tab >>A Model for Prediction of Roll Force and Torque in Edge Rolling
2007 (English)In: Steel Research International, ISSN 1611-3683, Vol. 78, no 2, p. 160-166Article in journal (Refereed) Published
Abstract [en]

Although edge rolling has been important since the early days of rolling, not until lately, methods for calculation of roll force and torque in edge rolling have been developed. Based on a simple upper bound solution, including plastic flow perpendicular to the rolling direction, a model was derived and arranged to be possible to implement into commercial roll pass design and set up software. Verifications were made in a laboratory rolling mill. Heavy strain hardened copper, and precipitation hardened aluminium were rolled. The calculated forces were in good agreement with the measurements. The developed model has been examined from well documented industrial rolling trials. The relation between the predicted and measured forces, are within 10 % and only in one case of twenty the predicted force deviate more than 15 % from the measured value. No trend indicating different precision as a function of the geometrical conditions has been seen. The experimental scatter is caused by the experimental situation rather than error in the model, which still can be assumed to be in the order of the numerical approximations. The mathematical form of the model is sound, and better predictions of the roll force can be done with the new model compared to older models. By implementation of the new model into any commercial software for rolling analysis, all kinds of roll pass sequences for wire rod and bar rolling can be studied.

Place, publisher, year, edition, pages
Düsseldorf: Stahleisen, 2007
National Category
Engineering and Technology
Research subject
maskinteknik
Identifiers
urn:nbn:se:oru:diva-4376 (URN)10.2374/SRI06SP053-78-2007-160 (DOI)
Available from: 2007-07-12 Created: 2007-07-12 Last updated: 2017-10-18Bibliographically approved
Överstam, H. & Lundberg, S.-E. (2007). A new approach to roll force and torque modelling in wire rod and bar mills. Paper presented at AIKW, 77.
Open this publication in new window or tab >>A new approach to roll force and torque modelling in wire rod and bar mills
2007 (English)Conference paper, Oral presentation only (Other academic)
National Category
Engineering and Technology
Research subject
Mechanical Engineering
Identifiers
urn:nbn:se:oru:diva-4523 (URN)
Conference
AIKW, 77
Available from: 2008-03-26 Created: 2008-03-26 Last updated: 2017-10-18Bibliographically approved
Lundberg, S.-E. (2007). A vision of wire rod rolling technology for the twenty first century. Advanced Materials Research, 23, 39-44
Open this publication in new window or tab >>A vision of wire rod rolling technology for the twenty first century
2007 (English)In: Advanced Materials Research, ISSN 1662-8985, Vol. 23, p. 39-44Article in journal (Refereed) Published
Abstract [en]

During the last 60 years, tremendous developments have been in wire rod rolling. Finish rolling speeds in the order of 100 – 140 m/s are common and on line wire rod cooling practices, has made it possible to treat the wire rod directly in line in the mill instead of separate off line operations. New procedures for roll setting have been developed to cut the downtime in the mill, by presetting the stands in separate workshops an supply the entire rolling line with fast changing equipment. Much of the efforts have been directed to improve the productivity and the wire rod quality, but also to improve the working environment. In the 21:st century, the main challenge will be the global energy saving and environment protection, which in turn will require new trends in wire rod rolling and wire rod rolling research. The in line treatment will be applied for more steel grades, but the important savings must be solved at the interface between the steelmaking/continuous casting and the wire rod rolling. Hot charging as well as warm rolling will be employed in order to save energy. Their knowledge of the rolling processes will be improved by means of new methods for plastic analysis. New processes must be introduced, where the requirements from the rolling mills will direct the development. These are including casting of smaller billet sections, in order to minimize the mechanical work, and thus the consumption of electrical energy for conversion of the billets to wire rod. By the development of these technologies not only energy will be saved. Better wire rod surfaces can be obtained and the investment cost for new rolling mills will decrease. However the development of new knowledge and new processes requires funding on a level that is hard to expect, especially from the funding system which exists at present.

Place, publisher, year, edition, pages
Zuerich-Uetikon: Scitec Publications, 2007
National Category
Engineering and Technology
Research subject
maskinteknik
Identifiers
urn:nbn:se:oru:diva-4520 (URN)10.4028/www.scientific.net/AMR.23.39 (DOI)
Available from: 2008-03-26 Created: 2008-03-26 Last updated: 2017-10-18Bibliographically approved
Larsson, S. & Lundberg, S.-E. (2007). Invention and innovation: the heritage to Morgårdshammar from Erik Norlind. Nordic steel & mining review (3)
Open this publication in new window or tab >>Invention and innovation: the heritage to Morgårdshammar from Erik Norlind
2007 (Swedish)In: Nordic steel & mining review, ISSN 0284-0448, no 3Article in journal (Other (popular science, discussion, etc.)) Published
National Category
Engineering and Technology
Research subject
Mechanical Engineering
Identifiers
urn:nbn:se:oru:diva-4526 (URN)
Note

Tidskriftens namn: Bergsmannen med Jernkontorets annaler : nordisk branschtidning för stål-, metall-, berg- och mineralindustrierna. Från 1989 är nummer 3 varje år engelskspråkigt, med titeln: Nordic steel & mining review

Available from: 2008-03-26 Created: 2008-03-26 Last updated: 2017-10-18Bibliographically approved
Lundberg, S.-E. (2007). Kalibriering für das Walzen von Kugeln auf Ein- und Mehrkalibrirwalzen. Der Kalibreur, 68, 21-27
Open this publication in new window or tab >>Kalibriering für das Walzen von Kugeln auf Ein- und Mehrkalibrirwalzen
2007 (English)In: Der Kalibreur, ISSN 0022-796X, Vol. 68, p. 21-27Article in journal (Refereed) Published
National Category
Mechanical Engineering
Research subject
Mechanical Engineering
Identifiers
urn:nbn:se:oru:diva-4525 (URN)
Available from: 2008-03-26 Created: 2008-03-26 Last updated: 2017-10-18Bibliographically approved
Lundberg, S.-E. & Överstam, H. (2007). Modelling of stress state, centre consolidation and roll force in billet rolling. Steel Research International, 78(6), 492-501
Open this publication in new window or tab >>Modelling of stress state, centre consolidation and roll force in billet rolling
2007 (English)In: Steel Research International, ISSN 1611-3683, Vol. 78, no 6, p. 492-501Article in journal (Refereed) Published
Abstract [en]

Roll pressure models have been derived from theoretical studies, FEM simulations and experimental investigations. A model developed from slip line field theory has been shown to fit well to the experimental results. The finite element simulations overestimated the pressure function. This is a common problem in hot rolling experiments, since the problem of measuring the correct rolling temperature makes the estimation of the yield strength very difficult. The difference between the FE calculations and the experimental measurements is a measure for the error in the experimental temperature measurements rather than for the accuracy of the finite element method. Traditional modelling has not been an appropriate tool to evaluate the material flow in the centre of the billet. In spite of the fact that the entire stress state can be modelled by slip line field theory, the slip lines which determine the stress state in the centre coincide for actual geometries only in one single point. Thus the strain increments are known only in that single point. Since a material element passes that point instantaneously, it is not possible to find any finite strains in the centre by integrating any incremental function. By FEM, strain modelling is simple and the possibility to consolidate a porous bloom or ingot core can be determined. FE modelling requires an entirely new approach to the modelling problem. It is not reasonable to use FEM to evaluate only the temperature distribution for the use in roll force models from the previous century. Instead, a fully thermomechanically coupled FE model is suggested. However, the calculation time is still far too long to be used for on-line control purposes. For this application hybrid modelling can be a solution, where off-line FE models are combined with empirical modelling, and simplified models can be used for the process control.

Place, publisher, year, edition, pages
Düsseldorf: Stahleisen, 2007
Keywords
billets, finite element analysis, hot rolling, slip, steel manufacture, stress effects, yield strength
National Category
Engineering and Technology
Research subject
maskinteknik
Identifiers
urn:nbn:se:oru:diva-4510 (URN)DH90-2007-001 (PubMedID)
Available from: 2008-03-26 Created: 2008-03-26 Last updated: 2017-10-18Bibliographically approved
Igel, L.-G., Bolin, Ö., Walk, R. & Lundberg, S.-E. (2007). Operative conditions and materials choice for roller guide rollers in wire rod and bar mills. Paper presented at AIKW, 77.
Open this publication in new window or tab >>Operative conditions and materials choice for roller guide rollers in wire rod and bar mills
2007 (English)Conference paper, Oral presentation only (Other academic)
National Category
Engineering and Technology
Research subject
Mechanical Engineering
Identifiers
urn:nbn:se:oru:diva-4524 (URN)
Conference
AIKW, 77
Available from: 2008-03-26 Created: 2008-03-26 Last updated: 2017-10-18Bibliographically approved
Lundberg, S.-E. (2006). A vision of wire rod rolling technology for the twenty first century. Paper presented at MATEHN ’06, Forth international conference on material and manufacturing technologies.
Open this publication in new window or tab >>A vision of wire rod rolling technology for the twenty first century
2006 (English)Conference paper, Oral presentation only (Refereed)
National Category
Mechanical Engineering
Research subject
Mechanical Engineering
Identifiers
urn:nbn:se:oru:diva-4509 (URN)
Conference
MATEHN ’06, Forth international conference on material and manufacturing technologies
Note

Keynote lecture

Available from: 2008-03-26 Created: 2008-03-26 Last updated: 2017-10-18Bibliographically approved
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