Browse > Article
http://dx.doi.org/10.21289/KSIC.2018.21.6.419

A Study on Improvement of Dimensional Accuracy in 2-axis Bending for Automotive Blow Motor Case  

Kwon, Il-Keun (Division of Mechanical Eng., Dongeui Institute of Technology)
Kim, Gug-Yong (Division of Mechanical Eng., Dongeui Institute of Technology)
Park, Jun-Woo (Hang Seong Industrial Co., Ltd.)
Publication Information
Journal of the Korean Society of Industry Convergence / v.21, no.6, 2018 , pp. 419-427 More about this Journal
Abstract
In case high strength steels are applied for press-formed automotive parts, it is very difficult to secure forming accuracy due to large springback compared to moderate strength steels. In this study, a repetitive step-wise forming analyses based on secant method was proposed as the die design method for mandrel(bending tool) for the 2-axis bending equipments. A bending die with circular mandrel was designed for the DP780 blow motor case of which diameter and thickness are 70.8mm and 2.0mm respectively. Forming tests were performed to verify the validity of established die design and the results were compared with that of conventional HGI(Hot galvanized iron steel) blow motor case. For additional improvement in forming accuracy, an elliptical mandrel was proposed and its validity was verified using forming analyses based on secant method.
Keywords
Blow motor case; 2-axis bending; forming accuracy; die design; forming test;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 C. H. Cha, S. K. Lee, D. C. Ko, B. M. Kim, "A study on the forming of automotive front side member part with ultra high strength steel of DP980", Transactions of Materials Processing 18(1), pp.39-44 (2009).   DOI
2 C. H. Suh, H. D. Shin, Y-C. Jung, C. D. Park, Y. H. Lim, Y. S. Kim, "A study on the forming process of stair type side sill for automobile using DP780", Transactions of Materials Processing 18(8), pp.601-606 (2009).   DOI
3 D. C. Ko, J. H. An, M. J. Jang, J. H. Bae, C. H. Kim, B. M. Kim, "Process design of seat rail in automobile by the advanced high strength steel of DP780", Transactions of Materials Processing, 17(3), pp.197-202 (2008).   DOI
4 M. K. Choi, H. Huh, "Investigation of springback behavior of DP780 steel sheets after the U-bending process ", Transactions of Materials Processing, 21(6), pp.384-388 (2012).   DOI
5 K. H. Kang, S. H. Kim, H. C. Ro, "Change in springback tendency during forming of a hat-type product with high strength steel using a digital servo press", Transactions of Materials Processing, 25(1), pp.21-28 (2016).   DOI
6 Gug-Yong Kim, Il-Keun Kwon, Jun-Woo Park, "Study on prediction of mechanical joining strength of blow motor case joint", Journal of The Korean Society of Industry Convergence 20(1), pp.81-87 (2017).   DOI
7 Jin-Woo Lee, "Advanced method for an initial pole position estimation of a PMLSM", the transactions of korean institute of power electronics, 10(2), pp.124-129 (2005).