Effect of shearing on production stability and die life in automatic multi-stage cold forging of an automobile wheel nut
- Authors
- Byun, Jong Bok; Abd Hamid, Nurhidayah; Cho, Gyu Seob; Chung, Wan Jin; Kang, Sung Muk; Lee, Kwang Hee; Joun, Man Soo
- Issue Date
- Mar-2024
- Publisher
- Springer Verlag
- Keywords
- Automobile wheel net; Die failure; Earing; Shearing; Short billet; Stress concentration
- Citation
- International Journal of Advanced Manufacturing Technology, v.131, no.1, pp 329 - 341
- Pages
- 13
- Indexed
- SCIE
SCOPUS
- Journal Title
- International Journal of Advanced Manufacturing Technology
- Volume
- 131
- Number
- 1
- Start Page
- 329
- End Page
- 341
- URI
- https://scholarworks.gnu.ac.kr/handle/sw.gnu/69701
- DOI
- 10.1007/s00170-024-13017-9
- ISSN
- 0268-3768
1433-3015
- Abstract
- In this study, the effects of earing in a sheared billet of S25C steel formed during rod shearing in an automatic multi-stage cold forging (AMSCF) process for an automobile wheel nut were experimentally and numerically investigated. Precision forging simulations with an emphasis on rod shearing were conducted using the implicit elastoplastic finite element method with a tetrahedral MINI-element scheme. AMSCF of an automobile wheel nut involves the use of a converging or near-conical die that shows a gradual reduction in its cross-sectional area. Our results showed that the shearing-induced earing plays the role of a pivot during balancing of the material inside the die cavity in the early stroke, before significant material contact. Earing formation resulted in a wobble motion of the material that accompanied the rigid-body motion. This ultimately led to a change in the center of mass of the material and unbalanced loading. Earing had a significant influence on the local high-cycle fatigue (HCF) fracture of die insets, especially in the cold forging of nut-like short products. The stress concentration on the die was attributed to asymmetric localized contact between the material and critical die corner, leading to changes in the mass center. Taken together, our results indicate that sheared billet characterization should account for earings with roll-overs and inclined surfaces to not only better predict the HCF life of die parts but also to optimize the forging outcome, particularly for safety products such as automobile wheel nuts.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - 공학계열 > 기계항공우주공학부 > Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.gnu.ac.kr/handle/sw.gnu/69701)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.