• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2008년도 춘계학술발표논문집
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• pp.46-48
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• 2008

나노복합 블레이드가 반도체 웨이퍼 가공을 위한 마이크로급 나노장치나 그 이상의 나노급 구조체를 위해 사용되었다. 금속 블레이드는 실리콘 웨이퍼 가공을 위해 사용되어 왔다. 그러나, 최근 레진 복합 블레이드는 반도체나 핸드폰의 쿼츠 웨이퍼 가공에 사용된다. 유기 또는 비유기 재료 선정은 기계가공성, 전기 전도성, 강도, 연성 및 웨이퍼 저항을 가진 블레이드를 만드는데 중요하다. 고성능 응용의 증대 요구에 따라 개발된 고기술 비유기성 재료의 혼합은 낮은 가격에 고기능의 신뢰도를 필요로 한다. 나노 입자의 크기를 가진 레진 복합물의 마이크로 설계는 입자간 상호작용의 제어가 필요하다. 형상 제작 동안 마이크로 차원에 두께를 유지하기 위해서는 마이크로/나노급 제작을 위한 가공기술이 중요한 것 중의 하나이다. 본 연구에서는 핫 프레스 구조물이 원래 설계 기준과 두께 차이의 실험 접근법을 사용해 만들어졌다. 다른 습식 공정 기술은 차원의 허용치를 개선하기 위해 만들었다. 실험들과 해석들은 신뢰성 결과가 사용가능함을 보여주었다. 반도체 시장에 사용될 레진 복합 블레이드의 개선 효과가 논의되었다.

• 한국기계가공학회지
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• 제15권5호
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• pp.93-99
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• 2016

The trimming process is required for satisfying the dimensions of a final product in the hot stamping process. In general, the mechanical trimming or laser trimming process is applied after hot stamping. However, these processes have several disadvantages such as short tool life and low productivity. Therefore, in this study, the optimal trimless blank shape for the hot stamping process of a sill side was designed to remove the trimming process after hot stamping. In order to design the trimless blank, numerical analysis was performed. Firstly, CFD analysis was carried out to predict the cooling temperature and holding time of the hot stamping process. Then, the optimal trimless blank shape was determined through FE analysis. The effectiveness of the designed trimless blank shape was verified through a hot stamping experiment at an actual industrial site.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2008년도 추계학술대회 논문집
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• pp.186-189
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• 2008

The flex plate, an automotive part which mounts to the automotive engine to transfer torque to transmission, should have considerable hardness and shape accuracy. As a way to produce the flex plate, the hot press forming technology which takes advantages of high formability at elevated temperature, enhanced strength and shape stability was introduced. Therefore, as one of major process parameters the heat treatment condition should be determined to obtain appropriate hardness in the range of manufacturer's specifications. In this study, two heat treatments, austempering and quenching and tempering (QT), were compared as feasible conditions fur the hot press forming of high-carbon tool steel and the hardness and toughness after heat treatments were evaluated. The study showed that both heat treatments resulted in improved hardness but only quenching and tempering showed practicable range of toughness.

• 한국자동차공학회논문집
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• 제18권5호
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• pp.25-30
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• 2010

The authors have studied on the corrosion resistance of the hot stamped steel sheets for the application to automotive parts. Recently automotive companies have focused on the hot stamped parts to meet the light weighting needs and the safe reason. Because of the cost reduction of the hot stamped parts, automotive companies increase the usage of the coated steel sheets, especially Al-Si coated steel sheets. The coated layer of Al-Si coated steel sheets contains up to 50% of Fe, which was diffused from the steel sheet, after hot stamping. The hot stamped steel sheet was not phosphated due to the oxidation layer of the coating, however, the result of the water resistance test is similar to that of the conventional GA steel sheets. The pitting depth and the weight reduction of the coated layer of hot stamped steel sheets are less than those of GA steel.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2012년도 제46차 학술발표회
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• pp.25-25
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• 2012

농업용 비닐하우스에 사용되는 EVA (ethylene-vinylacetate copolymer)고분자 필름의 무적성을 향상시킬 목적으로 EVA 및 PVAc (polyvinylacetate)필름을 가성소다 용액으로 가수분해하여 친수성을 검토하였다. EVA는 분말상의 고분자를 프레스로 압착하여 필름으로 성형하였으며, PVAc는 아세톤에 용해한 후에 필름으로 성형하였다. 가수분해에 따른 필름의 구조변화는 적외선 분광분석으로, 친수성 변화는 접촉각으로 평가하였다. 가수분해 시간이 증가함에 따라 친수성이 증가하였다. 이는 가수분해에 의해 소수성인 아세테이트기가 친수성인 수산기로 변했기 때문으로 생각되었다. 한편, 가수분해시킨 EVA 및 PVAc를 사용하여 프레스로 압착하여 제조한 필름에서는 친수성이 그다지 크게 증가하지 않았다.

• 한국기계가공학회지
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• 제14권3호
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• pp.43-49
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• 2015

This paper describes the design of a forged fitting form to acquire a method of product design measurement by target measurement standards. The pipefitting connects each pipe and combines seals and nipples with the pipes normally. Therefore, the section combined with the fitting pipe was measured by a 3D scanner, and the acquired measurement and the design measurement were obtained after modification of the forged fitting pipe by that standard. Moreover, the accuracy of the model was verified through leakage testing of the oil and verification of the design measurement for accuracy decisions on the design measurement after modification of the product.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 춘계학술대회 논문집
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• pp.816-819
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• 2000

Recently the styrofoam has been used fur material of press die pattern. The object of this research is to develope an automated laser system for manufacture of press die pattern which depends chiefly on handwork during its process. After converting 3-D CAD model into cross-sectional shape information, the unnecessary part of the section is vapored away by laser. The depth and width of cut are mainly under the control of laser power and beam feed rate. The optimum manufacturing conditions are obtained by preliminary experiments. It is necessary fur precise styrofoam pattern manufacturing to develope laser system which has sufficient motion accuracy and program or beam path generation and automatic control of this system.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1995년도 제2회 단조심포지엄 단조기술의 진보
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• pp.35-46
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• 1995

TR 단조공법은 기존의 프레스에 특수장치를 장착하여 프레스의 수직힘과 수평함을 동시에 갖도록 하여 일체형의 크랭크샤프트를 제작하는 공법으로, 연속입자흐름의 크랭크쓰 로우를 제작할 수 있기 때문에 보다 우수한 특성의 크랭크샤프트를 제작할 수 있다. TR 단 조공법을 이용한 크랭크샤프트의 제작은 하나의 소재로 단조하여 제작하기 때문에 기존과는 다른 작업공법 및 전용장비가 필요하나 국내에서는 이러한 공법이나 설비의 부재로 인해 생 산되지 못한 제품이었다. 본 개발에서는 중형엔진용 크랭크샤프트의 국산화를 실현한 측면 에서 TR 단조공법 및 장치에 대한 소개와 본 단조공법을 적용하여 제작된 크랭크샤프트의 제반 특성평가를 수행하여 균일한 물성 및 연속입자흐름에 따른 피로강도의 향상 여부를 확 인하였다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1995년도 춘계학술대회논문집
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• pp.178-185
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• 1995

Warm deep drawing for optimum forming conditions to give the maximum drawing depth is investigated and compared with the results at room temperature. Experiments which draw square cups of STS 304 stainless steel sheet under the constant lubrication condition of teflon film made both in a crank and hydrqulic press for two kinds of specimens . The maximum drawing depth at warm forming condition reaches 1.4 times the drawing depth at room temperature in a crank press, whereas 1.6 times in a hydrqulic press, and also more uniform distribution of thickness in case of warm deep drawn cup is observed. The effects of other factors on formability , such as forming temperature, speed of press and cooling of punch are examinnied and discussed.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2006년도 제5회 박판성형 SYMPOSIUM
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• pp.40-44
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• 2006

Sandwich structures, which are composed of a thick core between two faces, are commonly used in many engineering applications because they combine high stiffness and strength with low weight. Accordingly, the usage of sandwich structure is very widely applied to the aircraft, the automobile and marine industry, etc., because of these advantages. In this paper, we have investigated the buckling protection of an inner structure plate and the useful corrugated configuration for contact, and the fabrication method of the inner structure plate for large area using the continuous molding process. Also, we have guaranteed the accuracy of the molding process through the micro corrugated mold fabrication and secured the accuracy and analyzed aspect properties of the inner structure plate fabricated for a large area using the partial mold process.