• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 추계학술대회 논문집
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• pp.285-286
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• 2006

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 춘계학술대회 논문집
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• pp.851-852
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• 2008

• 오토저널
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• 제14권1호
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• pp.13-24
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• 1992

1) 1/2 Scale Model 실험과 실제품 성형실험을 통하여 정밀 냉간단조에 의한 Tripod Slide Housing의 제조공정 설계기술을 확립하고, 4단계 성형공정으로 시제품 제작에 성공하였다. 2) Triod Slide Housing을 성형할 수 있는 4단계(전방압출, Heading, 후방압출, Ironing)의 금형을 설계 및 제작하여 시제품 생산에 적용하고, 관련 필요기술을 축적하였다. 3)XC 48 등 중,고탄소강의 소둔 실험을 통하여 소둔 조건에 따른 구상화율 및 경도의 변화에 대한 연구를 수행함으로써, 고탄소강의 냉간단조시에 필요한 최적 소둔 조건에 응용할 수 있는 자료를 축적하였다.

• 오토저널
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• 제16권1호
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• pp.31-41
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• 1994

1. 가공성 평가실험 및 평가기술. 1.1 가공성 평가시험법. 1.2 실험방법. 1.3 피단한계. 1.4 파단발생 평가이론. 1.5 파단평가이론의 적용. Bulk재 소성가공 공정중에 있어서 거시적 가공성평가 방법 및 응용방법에 대하여 논하였다. Bolt Heading 가공과 같은 냉간압조 가공에 있어서 상기 모델들에 의한 재료고유의 가공한계선과 변형경로를 비교하므로써 가공성을 평가할 수 있으며 또한 보다 복잡한 형상제품의 최적가공을 위한 가공조건 및 재질선정의 최적화에도 유용하게 이용될 수 있다.

• 한국표면공학회지
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• 제8권1호
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• pp.1-9
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• 1975

The crorosion film of gilt bronz, silver and iron objects, which were excaved from Ancient Tomb of Silla Dynasty, was removed by the electrolytic reduction process. These metallic objects were mainly investigated for microstructure, designs and gilting film etc. Most iron objects might be made by hot forging process. The cold extrusion technique might be used for gold and silver objects, in addition to an amalgam method might be applied for the gilting Au film on Cu-alloy surface. For the gilting on glass surface, first, a Cu alloy was cladded on glass , next, Au-film was obtained on the Cu-ally by the amagum method.

• 한국기계가공학회지
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• 제7권3호
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• pp.47-49
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• 2008

The brake pipe is important part in automobile. The brake pipe have to prevent crack, fracture and defects for braking in safety. Especially, shape of ends of pipe has influence on ability of brake. Based on the procedure of process design, in this paper, the forming operation is designed by finite element method. Design variable and response value was selected shape of die and damage factor. To improve die that performed FEM and compared results of two types of die.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.377-380
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• 2000

The dimensional accuracy of the cold forged part is depended on the elastic characteristics of the die. To obtain the high stiffness of the prestressed die, the first stress ring of the tungsten carbide material is considered. For the design, Lam 's equation is used. The design of the prestressed die has been compared with the conventional that. For the comparison, the FE-analysis using ANSYS has been performed. The results indicate that the prestressed die with the high stiffness can be obtained by the using the high stiffness material as the first stress ring.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
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• pp.29-34
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• 2006

In this paper, the mechanical characteristics of ultrasonic cold forged technology (UCFT) used for the trimming knife and the effects of ultrasonic vibration energy (UVE) into the trimming process on the state of the strip cutting face were studied. And a diagnosis system to quality control for trimming knife and strip cutting face was developed and installed in plant. By the plant application of UCFT, service life of knife was more increased over 100% than that of conventional knife. And using the developed diagnosis system, the knife breakage and saw ear have been perfectly detected and quality control of trimming face is obtained effectively.

• 소성∙가공
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• 제19권4호
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• pp.210-216
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• 2010

The importance and interests for saving of energy and cost in industry has grown up. Therefore, process optimization to reduce the process and energy become one of the most important things. The non-heat treated steel, post-heat-treated is no necessary, has attractive points as structural materials. However, establishment of mechanical properties is necessary to apply non-heat-treated steel to structural parts. In this study, for non-heat-treated steel and pre-heat-treated steel, we have investigated microstructure, hardness, the tensile strength, compressive strength. And the FE analysis technology to predict the hardness value of forged part is developed on micro-alloyed steel forged part.

• 한국정밀공학회지
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• 제18권12호
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• pp.145-151
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• 2001

The dimensional accuracy of the cold forged part is depended on the elastic characteristics of the die. To increase the stiffness of the prestressed die, the first stress ring of the tungsten carbide alloy (WC) is considered. For the design, Lame's equation is used. Diameter ratios and interferences have been determinated by maximum inner pressure without yielding of materials. The design of the prestressed die has been compared with the conventional one. For the comparison, the FE-analysis using ANSYS has been performed. The results indicate that the prestressed die with the high stiffness can be obtained by the using the high stiffness material as the first stress ring.