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Lubrication and friction conditions vary with deformation during metal forming processes. Significant macro-variations can be observed when a threshold of deformation is reached. This study shows that during the cold compression processing of #45 (AISI 1045) steel rings, the magnitude of friction and surface roughness (Ra) changes significantly upon reaching a 45% reduction in ring height. For example, the Ra of compressed ring specimens increased by approximately 55% immediately before and after reaching this threshold, compared to an 18% or 25%variation over a 35%−45% or a 45%−55% reduction in height, respectively. The ring compression test conducted by this study indicates that the Coulomb friction coefficient μ and Tresca friction factor m are 0.105 and 0.22, respectively, when the reduction in height is less than 45%; and 0.11 and 0.24, respectively, when the reduction in height is greater than 45%.


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Variation of the friction conditions in cold ring compression tests of medium carbon steel

Show Author's information Dawei ZHANG1,2( )Bingkun LIU1Jingxiang LI1Minchao CUI1Shengdun ZHAO1
School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China

Abstract

Lubrication and friction conditions vary with deformation during metal forming processes. Significant macro-variations can be observed when a threshold of deformation is reached. This study shows that during the cold compression processing of #45 (AISI 1045) steel rings, the magnitude of friction and surface roughness (Ra) changes significantly upon reaching a 45% reduction in ring height. For example, the Ra of compressed ring specimens increased by approximately 55% immediately before and after reaching this threshold, compared to an 18% or 25%variation over a 35%−45% or a 45%−55% reduction in height, respectively. The ring compression test conducted by this study indicates that the Coulomb friction coefficient μ and Tresca friction factor m are 0.105 and 0.22, respectively, when the reduction in height is less than 45%; and 0.11 and 0.24, respectively, when the reduction in height is greater than 45%.

Keywords: friction condition, surface topography, ring compression test, friction calibration curve

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Publication history

Received: 27 May 2018
Revised: 19 October 2018
Accepted: 06 November 2018
Published: 07 May 2019
Issue date: April 2020

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© The author(s) 2018

Acknowledgements

The authors would like to gratefully acknowledge the support of the National Natural Science Foundation of China (Grant Nos. 51675415 and 51335009) and the Open Research Fund of the Key Laboratory of High- Performance Complex Manufacturing, Central South University (Kfkt2016-06).

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