naa a22 4500 510822002 CHVBK 20180411083537.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s12541-013-0014-1 doi (NATIONALLICENCE)springer-10.1007/s12541-013-0014-1 Design of roll profile in shape rolling of an irregular angle bar by the modified butterfly method [Elektronische Daten] [Sang-Jin Lee, Sung-Min Kim, Dae-Cheol Ko, Byung-Min Kim] The roll profile of an angle bar is generally designed by the butterfly method however, the design of the roll profile of an irregular angle bar requires a special rule to take a tapered leg or a protrusion on the leg into account. For this purpose, the butterfly method has been modified in this study to design the roll profile for an irregular angle bar by introducing the equivalent leg thickness. The thickness of the tapered leg or the leg with the protrusion is changed into the equivalent leg thickness to calculate the thickness and length of the leg for the next pass. Shape rolling processes for inverted and unequal angle bars are designed by the proposed method, and its effectiveness is verified by FE-simulation and experiments using plasticine. In addition, the design method is applied to the shape rolling of more complicated irregular angle bar, such as an automotive door hinge. The cross-sectional shapes at each pass are compared with those obtained from the experiment using steel. The results of FE-simulation and experiment show that the proposed design method effectively designs the roll profile for an irregular angle bar, leading to accurate shape and dimensions in the final product within the allowable tolerance of ± 0.4 mm in thickness and ± 1.5 mm in length. Therefore, the proposed design method can be widely used to design roll profiles for variously shaped angle bars in industrial fields. Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg, 2013 Irregular angle bar nationallicence Shape rolling nationallicence Roll profile nationallicence Butterfly method nationallicence Equivalent leg thickness nationallicence FE-simulation nationallicence Lee Sang-Jin Graduate School of Precision Manufacturing System Division, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, 609-735, Busan, South Korea aut Kim Sung-Min Graduate School of Precision Manufacturing System Division, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, 609-735, Busan, South Korea aut Ko Dae-Cheol Industrial Liaison Innovation Center, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, 609-735, Busan, South Korea aut Kim Byung-Min School of Mechanical Engineering, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, 609-735, Busan, South Korea aut International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/1(2013-01-01), 93-102 2234-7593 14:1<93 2013 14 12541 https://doi.org/10.1007/s12541-013-0014-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12541-013-0014-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lee Sang-Jin Graduate School of Precision Manufacturing System Division, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, 609-735, Busan, South Korea aut NATIONALLICENCE 700 1- Kim Sung-Min Graduate School of Precision Manufacturing System Division, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, 609-735, Busan, South Korea aut NATIONALLICENCE 700 1- Ko Dae-Cheol Industrial Liaison Innovation Center, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, 609-735, Busan, South Korea aut NATIONALLICENCE 700 1- Kim Byung-Min School of Mechanical Engineering, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, 609-735, Busan, South Korea aut NATIONALLICENCE 773 0- International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/1(2013-01-01), 93-102 2234-7593 14:1<93 2013 14 12541 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer