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A forging die design to improve the flower shape of flange bolt
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 Title & Authors
A forging die design to improve the flower shape of flange bolt
Kim, Kwan-Woo; Lee, Geun-Tae; Cho, Hae-Young;
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Flange bolt has a circular flange under the head that acts like a washer to distribute the clamping load over a large area. Flange bolt has usually been manufactured by cold forging. Flower shape defect occurs in the flange forging stage. This defect causes lack of dimensional accuracy and low quality. So it is needed to improve these forging defects. In this study, die design method for flower shape defect of flange bolt was suggested. In order to improve flower shape defect, inner diameter of the addition die in conventional forging process was modified. The forging process with applied modified die was simulated by commercial FEM code DEFORM-3D. The simulated results for modified die were confirmed by experimental trials with the same condition.
Flange bolt;Flower shape defect;Finite Element Method;Cold forming;
 Cited by
K. H. Kim, D. B. Kim, I. H. Lee, and H. Y. Cho, "Prediction of dimensional accuracy of flange bolt in cold forging using finite element Mmthod," Journal of Industrial Science and Technology Institute, vol. 28, no. 2, pp. 55-61, 2014 (in Korean).

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U. J. Jung, J. J. Lee, and G. J. Park, "A preliminary study on the optimal shape design of the axisymmetric forging component using equivalent static loads," Transactions of the Korean Society of mechanical engineers A, vol. 35, no. 1, pp. 1-10, 2011 (in Korean).

S. J. Jang, M. C. Lee, S. H. Shim, Y. H. Son, D. J. Yoon, and M. S. Joun, "Finite element analysis of manufacturing process of a 12 point flange head bolt with emphasis on thread rolling process," Transactions of Materials Processing, vol. 19, no. 4, pp. 248-252, 2010 (in Korean). crossref(new window)

J. W. Kim, S. W. Chae, S. S. Han, and Y. H. Son, "Manufacturing process design of aluminum alloy bolt," Journal of the Korean Society for Precision Engineering, vol. 27, no. 5, pp. 63-68, 2015 (in Korean).

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