期刊
FRICTION
卷 8, 期 2, 页码 311-322出版社
SPRINGER
DOI: 10.1007/s40544-018-0256-0
关键词
friction condition; ring compression test; friction calibration curve; surface topography
资金
- National Natural Science Foundation of China [51675415, 51335009]
- Open Research Fund of the Key Laboratory of High-Performance Complex Manufacturing, Central South University [Kfkt2016-06]
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 (R-a) changes significantly upon reaching a 45% reduction in ring height. For example, the R-a 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 mu 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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