SUS hexagonal bar has been widely used to make many kinds of hexagonal bolt/nuts and fittings. Peeling machine is used to make lustrous and clean surface of SUS circular bar in order to remove rust and impurities from surface of raw SUS circular bar. Similarly, roll unit system is used to make SUS hexagonal bar from SUS circular bar with lustrous and clean surface. Roll unit system is mainly divided into two parts ; one is roll unit and the other is mold frame. The purpose of this study was to evaluate the structural stability of mold frame supporting roll unit with numerical analysis. As the numerical analysis result, higher structural stability was gradually shown in order of models 4, 2, 3 and 1. It was considered that the structural stability of this study was influenced by the decrease of mold frame size, especially height decrease.

ABSTRACT
 1. 서 론
 2. 인발 공정
 3. 모델링 및 수치해석 방법
 4. 해석결과 및 고찰
 5. 결 론
 References

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