SUS hexagonal bar have been widely used to manufacture the hexagonal bolt/nut, adapter and fittings. Raw SUS circular bar is used to make SUS hexagonal bar using drawing system. The purpose of this study is to investigate the characteristics, for instance, such as stress, strain and reduction ratio of area for bar. As the results, it was confirmed that the maximum stresses were occurred at edge of hexagonal bar, thus it could be worked as residual stress of hexagonal bar. The phenomenon of spring back was almost no found in all parts of hexagonal bar. Furthermore it showed that the reduction ratios of area were about mean 26% when SUS circular bar was changed to SUS hexagonal bar in this study.

ABSTRACT
 1. 서 론
 2. 인발 공정(Drawing process)
 3. 모델링 및 수치해석방법
 4. 해석 결과 및 고찰
 5. 결 론
 References

• 이영식(Han Young Machinery Co., Ltd.) | Young-Sik Lee
• 양영준(Automotive Eng/Gyeongnam Nat'l Univ. of Sci. & Tech.) | Young-Joon Yang Corresponding Author