• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.1101-1104
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• 2004

A brake spider in an irregular shape, which is used as a part in the braking system of a vehicle like a big truck and a trailer, is subjected to a large torque and hence requires both strength and endurance over the brake heat. Manufacture of this product in practice is generally composed of hot forging processes and machining. At the present study, two or more processes were considered for the hot forging. With an initial circular billet, blocker and finisher processes were analyzed using the rigid-plastic finite element method and also in addition to the preforming process. Proper forging processes to manufacture an irregular product without forging defects, which are preforming, blocker and finisher, were discussed and commented upon.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.7 no.4
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• pp.56-61
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• 2008

Cropping metal materials is widely used for feeding processes of various forming method, such as forging, extrusion, drawing, and upsetting. However, cropping has many weak points, which are material loss in part of cutting, chip creation, and much use of lubrication oil, etc. In this study, instead of cropping, a novel process is proposed to cut metal materials, especially stainless steel bar which is known very difficult to crop. Results of FE-analysis will be shown to verify the proposed method comparing with those of the conventional cropping process. Also, fitting products were successfully forged using the fabricated billet by the proposed process.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.525-527
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• 2009

본 논문에서는 자동차 공조부품인 리시버드라이어로서 플랜지와 바디로 구성되어 있다. 리시버드라이어는 냉매 중 포함된 습기 및 기타 불순물을 차단하는 부품으로서 사이트글라스가 부착되어 냉매의 흐름의 상태를 알 수 있다. 또한 압력 밸브가 부착되어 있어 냉매 회로의 압력과 온도가 상승하면 녹아서 냉매를 배출하므로 배관이나 부품들의 압력에 의해서 파괴되는 것을 방지 할 수 있다. 최근 경제적 성형에 관심이 많아 대표적 성형공정인 냉간단조를 적용하여 소재 회수율 및 절삭 비용 등을 절감하는데 목적을 두었다. 냉간단조를 적용하여 자동차 공조 부품인 플랜지와 바디를 개발하는데 공정설계, 금형설계, 금형제작 기술을 확보하였다.

• Fire Science and Engineering
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• v.20 no.4 s.64
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• pp.19-25
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• 2006

In this paper, a new design of the sprinkler branch outlet for fire-extinguishing purposes is presented together with its manufacturing process. The conventional three-piece design is improved by a new one-piece design with the help of the manufacturing technology of cold forging. The forging process is simulated and optimized by the rigid-plastic finite element method and the design tryouts are thus minimized. It has been shown through its applications that the presented system is much more economical and structurally stronger.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2001.10a
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• pp.371-371
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• 2001

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.208-208
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• 2003

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2004.06a
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• pp.63-77
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• 2004

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2005.06a
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• pp.79-89
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• 2005

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2007.11a
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• pp.15-16
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• 2007

• Journal of the Korean Society for Precision Engineering
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• v.17 no.3
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• pp.102-107
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• 2000

This study describes computer-aided design system for stepped asymmetric forgings. To establish the appropriate process sequence, an integrated approach based on a rule-base system was accomplished. This system has four modules, which are undercut prevention module, shape cognition module, 3D modelling module and corner/fillet correction module. These modules can be used independently or at all. The proposed shape cognition method could be widely used in forging design of asymmetric parts.