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Finite element modelling of cold pilgering of tubes
Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
2015 (Engelska)Ingår i: Proceedings of the 8th International Conference on Computational Plasticity - Fundamentals and Applications, COMPLAS 2015, 2015, s. 716-726Konferensbidrag, Publicerat paper (Refereegranskat)
Resurstyp
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.

Ort, förlag, år, upplaga, sidor
2015. s. 716-726
Nyckelord [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
Nationell ämneskategori
Materialteknik
Forskningsämne
Stålformning och ytteknik
Identifikatorer
URN: urn:nbn:se:du-21303ISI: 000380573600069Scopus ID: 2-s2.0-84992261190ISBN: 9788494424465 (tryckt)OAI: oai:DiVA.org:du-21303DiVA, id: diva2:915987
Konferens
13th International Conference on Computational Plasticity, COMPLAS 2015, 1 September 2015 through 3 September 2015
Tillgänglig från: 2016-03-31 Skapad: 2016-03-31 Senast uppdaterad: 2017-08-29Bibliografiskt granskad
Ingår i avhandling
1. Modeling of Cold Pilgering of Tubes
Öppna denna publikation i ny flik eller fönster >>Modeling of Cold Pilgering of Tubes
2017 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Luleå: Luleå University of Technology, 2017
Serie
Licentiate thesis, ISSN 1402-1757
Nyckelord
Cold pilgering, finite element method, tube forming, tool elasticity, roll flattening
Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Stålformning och ytteknik
Identifikatorer
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 (Engelska)
Opponent
Handledare
Tillgänglig från: 2017-08-29 Skapad: 2017-08-29 Senast uppdaterad: 2017-08-29Bibliografiskt granskad

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Totalt: 518 träffar
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