Journal
TRIBOLOGY INTERNATIONAL
Volume 42, Issue 2, Pages 311-319Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2008.06.012
Keywords
Bulk metal forming; Friction law; Friction-sensitive metal forming process; Coulomb friction law; Constant shear friction law
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Funding
- Republic of Korea Ministry of Commerce, Industry and Energy [RTI04-01-03]
- National Research Foundation of Korea [과C6B1810] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this paper, the Coulomb friction law and the constant shear friction law were compared and investigated in detail using a rigid-plastic finite element method with emphasis on their application in bulk metal forming. The ring compression test for two different materials was used to evaluate the two friction laws, and then their effects on metal flow lines and forming loads for various friction-sensitive metal forming processes including strip rolling, ring gear forging, multistep extrusion, and pipe shrinkage and expansion were investigated. It was shown that considerable differences exist between the two friction laws, especially in friction-sensitive metal forming processes. (C) 2008 Elsevier Ltd. All rights reserved.
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