Piercing and Surface-Crack Defects in Cold Combined Forward-Backward Extrusion
Metal flow tends to be complex and difficult to predict in the combined forward-backward extrusion (CFBE) process. Piercing and surface-crack defects are phenomenal in forming fasteners featuring a forward extruded pin and a backward extruded cup. In this work, a series of the CFBE tests with variou...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-04-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/9/3900 |
| _version_ | 1827694146021752832 |
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| author | Heng-Sheng Lin Chien-Yu Lee Wen-Shun Li |
| author_facet | Heng-Sheng Lin Chien-Yu Lee Wen-Shun Li |
| author_sort | Heng-Sheng Lin |
| collection | DOAJ |
| description | Metal flow tends to be complex and difficult to predict in the combined forward-backward extrusion (CFBE) process. Piercing and surface-crack defects are phenomenal in forming fasteners featuring a forward extruded pin and a backward extruded cup. In this work, a series of the CFBE tests with various combinations of the forward extrusion ratio (FER) and the backward extrusion ratio (BER) were conducted. A forming limit diagram, detailed with the piercing and surface-crack defects on the forward extruded pin or the backward extruded cup, was developed to provide a conception in choosing appropriate extrusion ratios in forming fasteners with such pin-and-cup features. With the aid of the forming load-stroke curves and the finite element analysis of fracture damage, the fracturing mechanism for the CFBE process was provided. |
| first_indexed | 2024-03-10T11:58:08Z |
| format | Article |
| id | doaj.art-9bef6230b2dc4c689b4c953a2533cb6b |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T11:58:08Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-9bef6230b2dc4c689b4c953a2533cb6b2023-11-21T17:09:05ZengMDPI AGApplied Sciences2076-34172021-04-01119390010.3390/app11093900Piercing and Surface-Crack Defects in Cold Combined Forward-Backward ExtrusionHeng-Sheng Lin0Chien-Yu Lee1Wen-Shun Li2Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 807, TaiwanGeneral Education Center, Taiwan Shoufu University, Tainan 721, TaiwanDepartment of Mold and Die Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 807, TaiwanMetal flow tends to be complex and difficult to predict in the combined forward-backward extrusion (CFBE) process. Piercing and surface-crack defects are phenomenal in forming fasteners featuring a forward extruded pin and a backward extruded cup. In this work, a series of the CFBE tests with various combinations of the forward extrusion ratio (FER) and the backward extrusion ratio (BER) were conducted. A forming limit diagram, detailed with the piercing and surface-crack defects on the forward extruded pin or the backward extruded cup, was developed to provide a conception in choosing appropriate extrusion ratios in forming fasteners with such pin-and-cup features. With the aid of the forming load-stroke curves and the finite element analysis of fracture damage, the fracturing mechanism for the CFBE process was provided.https://www.mdpi.com/2076-3417/11/9/3900combined forward-backward extrusionpiercing defectsurface-crack defectfracturing damage |
| spellingShingle | Heng-Sheng Lin Chien-Yu Lee Wen-Shun Li Piercing and Surface-Crack Defects in Cold Combined Forward-Backward Extrusion Applied Sciences combined forward-backward extrusion piercing defect surface-crack defect fracturing damage |
| title | Piercing and Surface-Crack Defects in Cold Combined Forward-Backward Extrusion |
| title_full | Piercing and Surface-Crack Defects in Cold Combined Forward-Backward Extrusion |
| title_fullStr | Piercing and Surface-Crack Defects in Cold Combined Forward-Backward Extrusion |
| title_full_unstemmed | Piercing and Surface-Crack Defects in Cold Combined Forward-Backward Extrusion |
| title_short | Piercing and Surface-Crack Defects in Cold Combined Forward-Backward Extrusion |
| title_sort | piercing and surface crack defects in cold combined forward backward extrusion |
| topic | combined forward-backward extrusion piercing defect surface-crack defect fracturing damage |
| url | https://www.mdpi.com/2076-3417/11/9/3900 |
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