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Finite element modelling of cold pilgering of tubes
Dalarna University, School of Technology and Business Studies, Materials Technology.
2015 (English)In: Proceedings of the 8th International Conference on Computational Plasticity - Fundamentals and Applications, COMPLAS 2015, 2015, 716-726 p.Conference paper, Published paper (Refereed)
Resource type
Text
Abstract [en]

Cold pilgering is a cold forming process used during manufacturing of seamless tubes. The tube with a mandrel inside is fed forward and rotated in stepwise increments, while the roll stand moves back and forth. The total plastic deformation of the tube is such that the cross-sectional area of the tube decreases and the length of the tube increases during the process. However, this is performed in many small incremental steps, where the direction of deformation in a material point changes at each stroke. Most published models of cold pilgering use simplified material models. In reality, the flow stress is dependent on temperature, strain rate, strain history and microstructure. In this work, temperature and strain rate distributions are computed, using a 3D thermo-mechanical FE model, and the influence of temperature and strain rate on the rolling force is investigated. The Johnson-Cook model is employed to describe the flow stress using isotropic hardening. The results show that strain rate and temperature have a significant influence on the roll separation force.

Place, publisher, year, edition, pages
2015. 716-726 p.
Keyword [en]
Cold forming, Cold pilgering, Finite element analysis, Johnson-cook, Seamless tubes, Thermo-mechanical analysis, Von mises plasticity, Finite element method, Plastic flow, Plasticity, Tubes (components), Tubing, Pilgering, Von-Mises plasticity, Strain rate
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
URN: urn:nbn:se:du-21303ISI: 000380573600069Scopus ID: 2-s2.0-84992261190ISBN: 9788494424465 (print)OAI: oai:DiVA.org:du-21303DiVA: diva2:915987
Conference
13th International Conference on Computational Plasticity, COMPLAS 2015, 1 September 2015 through 3 September 2015
Available from: 2016-03-31 Created: 2016-03-31 Last updated: 2017-08-29Bibliographically approved
In thesis
1. Modeling of Cold Pilgering of Tubes
Open this publication in new window or tab >>Modeling of Cold Pilgering of Tubes
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Cold pilgering is a challenging tube forming process in terms of modeling due to the complexity in kinematic of tools, friction condition and material behavior. The process development has mostly been based on simple formulas and costly full-scale tryouts. The aim in this study is to develop validated Finite element models of cold pilgering to increase the understanding of influence of the process parameters on the produced tubes.

In the course of this thesis, three-dimensional mechanical and thermo-mechanical Finite element models of cold pilgering were developed. The commercial code MSC.Marc was used in the simulations. General 3D models are needed to be able to capture asymmetric deformation in cold pilgering. It was found that tool deflections together with elastic deformation of roll dies have considerable influence on the rolling force. Furthermore, the strain rate and temperature effects on the response of the material and thereby on the rolling force were evaluated.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2017
Series
Licentiate thesis, ISSN 1402-1757
Keyword
Cold pilgering, finite element method, tube forming, tool elasticity, roll flattening
National Category
Applied Mechanics
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-25902 (URN)978-91-7583-873-1 (ISBN)978-91-7583-872-4 (ISBN)
Presentation
2017-05-31, E130, Luleå tekniska universitet, Luleå, 10:25 (English)
Opponent
Supervisors
Available from: 2017-08-29 Created: 2017-08-29 Last updated: 2017-08-29Bibliographically approved

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Citation style
  • apa
  • ieee
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  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
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  • en-US
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  • nn-NB
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  • Other locale
More languages
Output format
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  • asciidoc
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