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조준행(Jun-Haeng Cho),최원호(Won-Ho Choi),박진석(Jin-Seok Park) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
The heat protector is part applied to the engine and under body to block the heat. Recently, heat protector has demanded to lightweight and high NVH performance like heat shield and vibration reduction. To meet requirements, material of heat protector part is changed to aluminum from SACD material. Also heat protector part is applying to composite panel made by two aluminum sheet. Composite panel made by two aluminum sheet has high performance in the heat shield and noise vibration reduction. However It is highly vulnerable to vibration from joint assembly with car body. So, we developed aluminum two composite panel has air pocket in the between sheet. also evaluated on the vibration fatigue for composite panel. Result of vibration fatigue performance test was used to concluding.
알루미늄 1xxx 계열 2겹 복합판재의 기계적 특성 평가
조준행(Jun-Haeng Cho),최원호(Won-Ho Choi),박진석(Jin-Seok Park) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Auto parts industry development trend of eco-friendly vehicles, depending on the car body and lightweight chassis components are demand constantly. In particular, heat protector part of automotive exhaust system muffler is changed to aluminum from the existing SACD material, and studies for applying the sheet of multilayer structure have been actively carried out. However, composite panel made o f two sheet of aluminum have problem that fastening force is low. It is may give rise to serious trouble when the press forming. sheet material can cause separation. Therefore, in this study, composite sheet of multilayer was developed and conduct a mechanical performance test. test was done tensile strenght and peel strength according to the directionality of sheet. Result of mechanical performance test was used to concluding.
엠보싱 알루미늄 판재의 기계적특성과 스프링백 평가 (제1보)
김영석(Kim, Young-Suk),조준행(Cho, Jun-Haeng),Van-Cuong Do,신동우(Do, Van-Cuong) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.2
엠보싱된 알루미늄 판재는 표면적이 증가하여 방열효과가 뛰어나고 가공경화에 의해 굽힘강성이 증가하여 자동차 열차단기에 널리 사용된다. 하지만 판재의 특성상 주름발생률이 높아 프레스 성형에 많은 제약이 따른다. 본 연구에서는 3차원 구조 알루미늄 판재의 프레스 성형성 평가를 위한 기초연구로 3차원 구조 엠보싱 콘 형상 판재의 기계적특성을 평가 하고 굽힘실험을 통해 프레스 가공 후 발생하는 스프링백을 정량적으로 평가하였다. 엠보싱 판재는 패턴의 방향에 따라 인장특성이 상이하다. 특히 평행 엠보싱 시편의 경우 항복응력이 감소하며 대각 엠보싱 시편의 경우 항복응력이 증가하게 되고 영률의 감소가 크게 나타난다. 그 결과 굽힘 성형가공 후에 스프링 백에 영향을 미친다. Embossed aluminum sheets were been used in heat insulation purpose for automative exhaust parts because of increasing their surface areas and stiffness reinforcement. However, there are many restrictions because of high rate of wrinkle occurrence on press working. We have performed the tensile and bending tests for embossed sheets to clarity its mechanical properties and springback characteristics. Embossed aluminum sheets showed a different flow stress after plastic yielding due to flattening the embossed cone shape. Above all, yield stress of parallel embossed specimen decreases while its diagonal one increases and the decrease of young’s modulus in the embossed sheets contributes to the increase of springback amount.
엠보싱된 알루미늄 판재의 기계적특성과 스프링백 평가(제 1보)
김재성(Jae-Seong Kim),조준행(Jun-Haeng Cho),김영석(Young-Suk Kim) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
엠보싱된 알루미늄 판재는 자동차의 배기계의 열 차단을 위해 최근에 널리 사용되고 있다. 본 연구에서는 엠보싱된 알루미늄 판재의 프레스 성형성 평가를 위한 기초연구로 엠보싱된 판재의 기계적특성을 평가하고 굽힘실험을 통해 프레스 가공 후 발생하는 스프링백을 정량적으로 평가하였다. 엠보싱판재는 패턴의 방향에 따라 인장특성이 상이하며 특히 영률의 감소가 크게 나타나며 그 결과 굽힘 성형가공 후에 스프링 백에 영향을 미친다.
손기수(Son, Ki-Su),곽희성(Kwak, Hee-Sung),강창훈(Kang, Change-Hoon),조준행(Cho, Jun-Haeng) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.11
This study was performed to develop accelerated life test method of the wind-turbine gearbox using accumulated damage theory that used to model the fatigue of parts that receive variable load. The accumulated damage theory was introduced, and the estimation of life and calculation of accelerated life test time was illustrated. As the actual application example, accelerated life test method of the gearbox was described. Life distribution of the wind-turbine gearbox was supposed to follow Weibull distribution and life test time was calculated under the conditions of average life (MTBF) 140,600 hours and 99% reliability for one test sample According to the accumulated damage theory, because test time can shorten in case increase test load, test time could be reduced by 1.2 years when we put the load 1.2 times of rated load than 0.93 times of rated load that is equivalent load calculated by load spectrum of the wind turbine. This time, acceleration coefficient was 21.3. This accelerated test method was used to develop accelerated test method of gear reducer, gear and bearing as well as the industrial gearbox and it is considered to be applied comprehensively to mechanical parts the fatigue of which is happened by load or pressure etc.
실사이드 부품의 롤포밍공정에서 고주파유도가열 부가조건에 따른 기계적 특성 및 미세조직 평가
김근영(Kun-Young Kim),최이존(Lee-Jon Choy),신현일(Hyun-Il Shin),조준행(Jun-Haeng Cho),이창훈(Chang-Hoon Lee),강명창(Myung Chang Kang) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.6
Hot stamping processes are possible for tensile strength 1.4 GPa but the strength reduction is appeared from the cooling performance unbalance. And the strength of roll forming process is below than that of hot stamping process owing to using the steel which is lower strength of boron steel. In this study, We provide roll forming process asssisted high-frequency induction heating to solve the problem of conventional one. The experiments were carried out at under various sill side part conditions: high-frequency induction heating conditions of 15, 18, 21, 24, 27 and 30 kW. The high-frequency induction heating temperature was checked with Infrared camera and the sill side parts of mechanical properties and microstructure were measured. The heating temperature of high frequency induction was measured to max 850 ℃ under the coil power of 30 kW. The tensile strength was 1.5 GPa and hardness was 490 Hv. The martensite structure was discovered under coil power of 30 kW. The weight of steel material sill side having thickness 1.5 mm and the boron steel sill side having thickness 1.2 mm were compared to weight effect. The boron steel sill side reduced 11.5% compared to steel. Consequently, manufacturing process of 1.5 giga-grade’s sill side part was successfully realized by the roll forming assisted high-frequency induction heating methods.
탄소섬유복합재료의 시트크로스 부품에서 진공수지주입성형에 의한 성형성 평가
김근영(Kun-Young Kim),곽성훈(Sung-Hun Kwak),한규동(Gyu-Dong Han),박진석(Jin-Seok Park),조준행(Jun-Haeng Cho),이창훈(Chang-Hoon Lee),강명창(Myung-Chang Kang) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.3
In this study, a seat cross member was fabricated by optimizing the resin transfer molding processing of CFRP (Carbon Fiber Reinforced Plastics) materials. This seat cross member is used in automotive underbody parts and provides side impact support. The seat cross was manufactured via vacuum resin transfer molding. The process included 1min of resin injection, 8 mins of heating, and 1 min of cooling, for a total molding time of 10mins. Tensile test results showed an average breaking load of 21.50kN, a tensile strength of 404 MPa, and an elastic modulus of 46.2 GPa. As a result, the CFRP seat cross provides the same strength as a similar steel part, but weighs 42% less.