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임성준(Seongjune Lim),박민영(Minyoung Park),손대현(Daehyun Son),이대인(Dae In Lee),임현준(Hyunjune Yim) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.11
프레스 금형의 캠 모듈을 구성하는 부품들은 큰 성형력을 지탱해야 하므로 서로 간에 크고 많은 접촉면을 요구하며, 각 부품의 접촉면은 금형의 복잡한 구조로 인해 제한된 위치에 놓이게 된다. 많은 수의 접촉면은 과잉제약을 유발하고, 이는 프레스 작업의 재현성을 감소시켜 제품의 품질 일관성을 저하시킨다. 또, 접촉면들의 위치가 한쪽으로 치우치면 금형 성형면의 간격이 금형 부품의 편차에 민감해져서 요구되는 치수 조건을 만족하기 어려워진다. 본 논문에서는 부품의 수가 많은 더블 캠 모듈을 예시로 하여 기존 프레스 금형 설계의 문제점을 분석하고, 강건한 적정제약이 구현되는 설계 개선안을 개발하여 제시하였다. 공차해석을 통해 개발된 개선안이 성형면의 간격 요건 만족율을 현저히 향상시킴을 확인하였다. 본 연구에서 제안하는 강건 적정제약 설계는 모든 조립품의 설계에 적용되는 중요한 원리이므로 설계자들이 이를 적용하여 높은 품질을 경제적으로 확보할 수 있기를 기대한다. The parts that comprise a cam module of a press die require many large contact surfaces with each other because they need to deliver large forming loads for production, and each contact surface has limited area for location due to the complex structure of the press die. Many contact surfaces can lead to over-constrained design, thereby yielding low repeatability among successive operations. Also, contact surfaces distributed over only a small region of a part may increase the sensitivity to part variations, leading to a less-robust design. In this paper, as an example, the existing design of a double cam module with many parts was analyzed to find that it is a highly over-constrained design and suffers from the lack of robustness. An improved design was developed by eliminating all over-constraints and increasing the robustness, which exhibited, via tolerance simulations, substantial improvements of the critical sheet forming clearance. As the general principles of proper-constraint and robust design are applicable to any assembly, it is expected that designers of mechanical components will adopt them to improve product quality at lower cost.
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임성준(Seongjun Im),김희욱(Heewook Kim),임재훈(Jaehoon Lim),윤정환(Junghwan Yoon),장세준(Sejoon Jang) 한국해군과학기술학회 2023 Journal of the KNST Vol.6 No.2
The requirements for system safety management are gradually emerging in the process of weapon system development, but in reality, there is no dedicated management tool in Korea that meets the characteristics of the defense industry. This paper presents the research and development results of a safety management tool that meets the U.S. Department of Defenses system safety regulations (MIL-STD-882E). And by applying this tool to actual weapon system R&D projects, we proposed a way to improve weapon system safety.
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김희욱(Heewook Kim),임성준(Seongjun Im),임재훈(Jaehoon Lim),윤정환(Junghwan Yoon),남현우(Hyunwoo Nam) 한국신뢰성학회 2022 신뢰성응용연구 Vol.22 No.2
Purpose: Accidents related to explosives are infrequent, but when they occur, they can be fatal. In the case of missiles containing large amounts of explosives, safety design is of utmost importance. However, researches on quantitative indexes for managing safety design activities and interest in safety design are lacking. Therefore, it is necessary to develop quantitative management indexes for implementing safety controls at the design level and secure safety through the safety design process in the development of missiles. Methods: In this study, we propose a safety design process for missile development with hazard identification and risk assessment based on the MIL-STD-882E standard. Moreover, we develop quantitative management indexes (SMR, RAR) for controlling safety at the design level. The feasibility and effectiveness of these indexes are verified through case studies. Results: A hazard analysis was performed on a missile system under development, and 26 unacceptable hazards were identified. Then, the problems affecting the existing safety protocols were identified using the proposed quantitative management indexes (SMR, RAR). Conclusion: The implementation of a safety design process based on quantitative management indexes (SMR, RAR) from the early stages of research and development can improve the safety of missiles.
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