An alternative evaluation method for friction condition in cold forging by ring with boss compression test
Ring compression test (RCT) is a very popular method used to quantitatively evaluate friction condition sat the tool–workpiece interface by measuring the variations of the inner diameter of the ring in metal forming. There are many possibilities for measuring the inner diameter variations in RCT bec...
| Main Authors: | , , |
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| Format: | Article |
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Elsevier
2015
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| Online Access: | https://eprints.nottingham.ac.uk/42955/ |
| _version_ | 1848796610550562816 |
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| author | Hu, Chengliang Ou, Hengan Zhao, Zhen |
| author_facet | Hu, Chengliang Ou, Hengan Zhao, Zhen |
| author_sort | Hu, Chengliang |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Ring compression test (RCT) is a very popular method used to quantitatively evaluate friction condition sat the tool–workpiece interface by measuring the variations of the inner diameter of the ring in metal forming. There are many possibilities for measuring the inner diameter variations in RCT because of non-uniform deformation of the inner hole during the test. Such non-uniform deformation of the inner hole causes difficulties in precise measurement of the inner diameter and hence the accuracy of the derived friction coefficient. To avoid the disadvantage in dimension measurement of the conventional RCT, an alternative method for evaluating friction conditions in cold forging named ring with boss compression test (RCT-B) is proposed. By the introduction of the RCT-B concept, finite element simulation results under different friction conditions were obtained. Results showed that the shape of the outer boss remains stable during the compression deformation and allows the diameter of the outer boss to be measured more easily and accurately. The calibration curves of the RCT-B concept were constructed by using FE simulation, which cover the range of friction conditions in cold forging process. Finally, the RCT-B method was successfully applied to determine the friction factors of four different lubricating conditions in compression of aluminum rings. Furthermore, the phenomena with different lubricating conditions between the upper and lower die–workpiece interfaces were also studied using both simulation and experimental testing. The results show that it is possible to quantitatively assess the difference of friction conditions at the upper and lower die–workpiece interfaces by simply checking the inclined angle of the outer boss with the RCT-B method. |
| first_indexed | 2025-11-14T19:50:43Z |
| format | Article |
| id | nottingham-42955 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:50:43Z |
| publishDate | 2015 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-429552020-05-04T17:15:54Z https://eprints.nottingham.ac.uk/42955/ An alternative evaluation method for friction condition in cold forging by ring with boss compression test Hu, Chengliang Ou, Hengan Zhao, Zhen Ring compression test (RCT) is a very popular method used to quantitatively evaluate friction condition sat the tool–workpiece interface by measuring the variations of the inner diameter of the ring in metal forming. There are many possibilities for measuring the inner diameter variations in RCT because of non-uniform deformation of the inner hole during the test. Such non-uniform deformation of the inner hole causes difficulties in precise measurement of the inner diameter and hence the accuracy of the derived friction coefficient. To avoid the disadvantage in dimension measurement of the conventional RCT, an alternative method for evaluating friction conditions in cold forging named ring with boss compression test (RCT-B) is proposed. By the introduction of the RCT-B concept, finite element simulation results under different friction conditions were obtained. Results showed that the shape of the outer boss remains stable during the compression deformation and allows the diameter of the outer boss to be measured more easily and accurately. The calibration curves of the RCT-B concept were constructed by using FE simulation, which cover the range of friction conditions in cold forging process. Finally, the RCT-B method was successfully applied to determine the friction factors of four different lubricating conditions in compression of aluminum rings. Furthermore, the phenomena with different lubricating conditions between the upper and lower die–workpiece interfaces were also studied using both simulation and experimental testing. The results show that it is possible to quantitatively assess the difference of friction conditions at the upper and lower die–workpiece interfaces by simply checking the inclined angle of the outer boss with the RCT-B method. Elsevier 2015-10-01 Article PeerReviewed Hu, Chengliang, Ou, Hengan and Zhao, Zhen (2015) An alternative evaluation method for friction condition in cold forging by ring with boss compression test. Journal of Materials Processing Technology, 224 . pp. 18-25. ISSN 0924-0136 http://www.sciencedirect.com/science/article/pii/S0924013615001764 doi:10.1016/j.jmatprotec.2015.04.010 doi:10.1016/j.jmatprotec.2015.04.010 |
| spellingShingle | Hu, Chengliang Ou, Hengan Zhao, Zhen An alternative evaluation method for friction condition in cold forging by ring with boss compression test |
| title | An alternative evaluation method for friction condition in cold forging by ring with boss compression test |
| title_full | An alternative evaluation method for friction condition in cold forging by ring with boss compression test |
| title_fullStr | An alternative evaluation method for friction condition in cold forging by ring with boss compression test |
| title_full_unstemmed | An alternative evaluation method for friction condition in cold forging by ring with boss compression test |
| title_short | An alternative evaluation method for friction condition in cold forging by ring with boss compression test |
| title_sort | alternative evaluation method for friction condition in cold forging by ring with boss compression test |
| url | https://eprints.nottingham.ac.uk/42955/ https://eprints.nottingham.ac.uk/42955/ https://eprints.nottingham.ac.uk/42955/ |