• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.10a
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• pp.73-77
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• 1992

환봉소재의 정밀절단을 위한 고속 환봉절단 공정에 있어서 절단금형은 공정중 막대한 타격력을 받기 때문에 금형의 파손방지 및 내구성향상을 위한 금형설계 기술이 절실히 요구되고 있다. 이같은 절단금형의 최적설계를 위해선 타격시 램이 금형에 가하는 충격력에 대한 예측이 필수적이므로 본 연구에서는 환봉절단 공정에 대한 동역학적 해석을 통해 충격력과 접촉시간을 이론적으로 구하였으며 이를 기존의 이론값과 비교한 결과, 보다 정확한 충격력의 예측이 가능하였다. 그리고 본 이론을 국내 최초로 개발된 환봉절단 장치에 적용하여 타격속도, 절단저항, 램과 금형의 하중비 등의 인자들과 충격력 사이의 관계를 밝혀냄으로써, 향후 최적금형 설계를 위한 데이터 베이스를 구축하였다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.20 no.5
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• pp.1562-1572
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• 1996

The rigid-plastic finite element formulation including the inertia force is derived and then the rigid-plastic finite elemnt program considering the inertia effect is developed. In order to consider the strain hardening, strain rate hardening and thermal softening effects which are frequentrly observed in high-velocity deformation phenomena, the Johnson-Cook constitutive odel is applied. The developed program is used to simulate two high-velocity deformation problemss ; rod impact test and hdigh-velocity compression precess. As a result of rod impact test simulation, it is found that the siulated result has a good agreement with the experimental observation. Through the high-velocity compression process simulation. it is also found that the accuracy of the simulated results is dependent upon the time increment size and mesh size.

• Journal of the Korea Convergence Society
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• v.9 no.8
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• pp.155-160
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• 2018

Automotive seat is a part to supply the convenience and safety of driver at driving. Recently, the seat has the role to protect driver from the outside impact or vibration and give the convenience except such a usage as chair. The design on structural function of the seat frame is important like the impact safety and durability. In this study, the seat is designed by adding one hollow rod to the part of seat back frame in order to enhance the structural safety and durability. This study was carried out by using CATIA and ANSYS as the design and analysis programs. As this study result through the structural and vibrational analyses, model 4 was seen to have the durability more superior than the other models. By utilizing this result, it is thought to be the useful material at designing the automotive seat frame with durability. It is possible to be grafted onto the convergence technique at the automotive seat frame and show the esthetic sense.