• 한국정밀공학회지
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• 제23권10호
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• pp.96-102
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• 2006

This paper presents the mechanics of the link of a double-action link-type hydraulic die set for the enclosed die forging. Operational principle of the die set in the enclosed die forging is introduced with emphasis on force transmission from the press and the hydraulic system to the material through links, die components and punches. The force exerted on the link is statically investigated and its structural analysis is carried out. The analyzed results are discussed to be used for design of the link system.

• 한국주조공학회지
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• 제21권3호
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• pp.155-162
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• 2001

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1999년도 단조 심포지엄
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• pp.109-120
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• 1999

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 제8회 단조심포지엄
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• pp.1-9
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• 2003

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 제8회 단조심포지엄
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• pp.63-76
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• 2003

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2001년도 제6회 단조 심포지엄
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• pp.85-98
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• 2001

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2001년도 제6회 단조 심포지엄
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• pp.73-84
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• 2001

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 1996년도 춘계학술강연 및 발표대회 강연 및 발표논문 초록집
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• pp.27-28
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• 1996

• 한국생산제조학회지
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• 제20권5호
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• pp.582-588
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• 2011

This study was aimed at the design of the dies for the unified shaft joint using the computer simulation to shorten the period of production, on the basis of the process planning which was designed by the field experts. In the computer simulation, 'Deform-3d' and 'Eesy-DieOpt' have been used, which are the commercial process analysis and die design program. Through the process analysis, we could know the propriety of the forming process, the inner pressure of the die and the suitable fitting pressure between the insert and the sleeve which was not showing any positive tangential stresses in the insert. Through the simulation of die design, we could know the number of the stress ring, the diameter ratios, the stresses of the die, the shrink fitting tolerance and temperature in the condition of the already determined maximum outer die diameter of the multi-stage former. The validity of the die design using the computer simulation was analyzed by the experiments and the results were satisfactory. As the results of this study, the new and easy die design system for multi-forging has been developed.

• 한국정밀공학회지
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• 제34권2호
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• pp.83-87
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• 2017

A multi-step warm forging process for subminiature screws is investigated. Due to the low formability of Titanium alloys, bit forming of Titanium screws is difficult by cold forging. In order to overcome this low formability of Titanium alloys, two candidate processes, i.e., multi-step forging and warm forging are introduced. First, a multi-step (two-step) forging process is investigated. The punch shape and stroke of forging during the first step is designed via various analyses. Finally, the bit formability is investigated at different forging temperatures. Analyses are carried out for two-step forging at various temperatures and the formability under these thermal conditions is compared.