Browse > Article
http://dx.doi.org/10.5762/KAIS.2016.17.10.696

Optimization of Initial Blank Shape of Multi-stage Deep Drawing for Improvement of Formability  

Lee, Sa-Rang (Department of Metal Mold Design Engineering, Kongju National University)
Park, Sang-Min (Department of Metal Mold Design Engineering, Kongju National University)
Hong, Seokmoo (Department of Metal Mold Design Engineering, Kongju National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.17, no.10, 2016 , pp. 696-701 More about this Journal
Abstract
Multi-stage deep drawing is a widely used industrial manufacturing process, and its applications are gradually expanding to both small products and large metallic products. The USB C-type socket used in smart phones, for example, is manufactured using oval multi-stage deep drawing. The socket is very small and slender and it requires precise manufacturing. The thickness distribution of the final product is guaranteed only if it is uniform throughout the overall process. Therefore, minimizing the height difference between long and short sidewalls after the first operation is important for this goal. An initial blank optimization was performed for an oval-type drawing process based on finite element simulations. The goal was to determine an initial blank geometry that can maintain uniform height and thickness after the first draw operation. The initial blank shape of the sheet metal was optimized, and the results show that it satisfied the conditions of minimal thickness reduction and even thickness distribution. The geometry from the optimized simulation was compared with experimental results, which showed good agreement.
Keywords
Optimization; Stamping; Multi-stage stamping;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
연도 인용수 순위
1 K. S. Lee, J. B. Kim, W. J. Jung, J. H. Kim, "Influence of Blank holding Force and Blank Diameter on the Drawability and Quality of Very Small Cylindrical Cups", Trans. Mater. Process., vol. 23, no. 8, pp. 489-494, 2014. DOI: http://dx.doi.org/10.5228/KSTP.2014.23.8.489   DOI
2 H. B. Shim , "A Study on the Effect of Blank Shape on the Miniature Stamping", Trans. Mater. Process., vol. 15, no. 4, pp. 304-310, 2006. DOI: http://dx.doi.org/10.5228/KSPP.2006.15.4.304   DOI
3 D. H. Park, W. R. Bae, S. B. Park, S. S. Kang, "A Study on the Influence of Blank Shape in Elliptical Deep Drawing Process, Trans. Mater. Process", vol. 9, no. 5, pp. 469-477, 2000.
4 Y. S. Kim, W. J. Choi, "A Cup Drawing Test for Measuring the Coefficient of Friction in Sheet Metal Forming", Trans. of the Kor. Soc. Automotive Eng., vol. 2, no. 1, pp. 96-105, 1994.
5 D. H. Park, B. K. Choi, S. B. Park, S. S. Kang, "Application of Surface Area Calculating System for Design of Blank Shape of Deep Drawing Product, J. Kor. Soc. Precision Eng., vol. 17, no. 4, pp. 97-105, 2000.
6 S. K. Cheon, C. H. Han, Kor. Soc. For Tech. of Plast., Spring Conf., Kor. Soc. Tech. Plast, Seoul, Korea, pp. 237-241, 1998.
7 J. Kim, S. Hong, "Process and Die Design of Square Cup Drawing for Wall Thickening", J. KAIS, Vol 16, no. 9, pp. 5789-5794, 2015. DOI: http://dx.doi.org/10.5762/kais.2015.16.9.5789
8 Sun Sac Oh, Won Yi, "A Study on the Mechanical Properties and Deformed Layer of STS 316L and 316LN Stainless Steels", J. Kor. Soc. Precision Eng., vol. 21, no. 1, pp. 71-79, 2004.
9 S. Park, "Preform Design of a Forged Punch by Approximate Optimization", J of the KAIS, vol. 15, no. 7, pp. 4057-4064, 2014. DOI: http://dx.doi.org/10.5762/kais.2014.15.7.4057
10 S. Hong, J. Hwang, "Bead Optimization to Reduce Springback of Sheet Metal Forming using High Strength Steel", J. KSMTE., vol. 23, no. 4, pp. 350-354, 2014. DOI: http://dx.doi.org/10.7735/ksmte.2014.23.4.350
11 LS-DYNA, User's Manual, 2014.
12 Gom ATOS, ATOS Professional user's manual, GOMmbH, 2014.