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박영선(Y.S.Park),양우호(W.H.Yang),임재문(J.M.Lim),박경진(G.J.Park),박상희(S.H.Park),이형주(H.J.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
A simulation model of a belt integrated seat(BIS) is established using a computer simulation program ATB (Articulated Total Body). The model is validated by the well consistent with the dynamic load test with a conventional belt integrated seat. Hyper-ellipsoid elements are used to improve the accuracy of a simulation model and numerical results show the better performance of a BIS than a conventional seat for the view point of a occupant safety. A parameter study of seat belt is performed to choose 'the proper belt for a BIS.
경사진 바인더면의 드로우비드력을 측정하기 위한 모의실험장치
양우호(W. H. Yang),최광용(K. Y. Choi) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
A novel set of experimental test tooling for measuring pulling and holding forces for drawbeads on binders inclined at a wide range of angles is introduced. A mechanical design featuring a single load cell, a male-female draw bead set, translation and rotation degrees of freedom, and a screw-driven clamping system has been incorporated into a standard tensile test machine. On a real time basis, restraining and holding force data with respect to draw-in displacement may be directly downloaded into a PC for data processing. The proposed experimental system represents a significant breakthrough in drawbead simulation technology due to its relatively low cost, clever design, and versatility. The system is shown to yield excellent experimental data suitable for verifying theory and numerical model predictions.
고효율 근적외선 가열장치를 사용한 온간성형에서 DP980 소재의 스프링백 분석
이은호(E. H. LEE),황준선(J. S. HWANG),이창환(C. W. LEE),양동열(D. Y. YANG),양우호(W. H. YANG) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
In recent years, increasing attention for environment and safety have made high-strength steel be one of the most important materials. Especially, automobile industry has given much attention to high-strength steel sheets in order to obtain high fuel efficiency and safety for passengers. In high-strength steel sheet forming, however, Large springback after unloading has been a obstacle to expansion of usage. To reduce springback of high-strength steel sheet, warm forming has been consistently researched, but increasing temperature whole die or material consumes huge energy. Therefore in this research, DP980 sheet metals were heated only areas where plastic deformation occurs by NIR local heating devices. After that, V-bending and 2D-draw bending were carried out to Analysis springback. Also evaluation of possibility of NIR local heating was conducted through analysis of springback in V-bending and 2D-draw bending.
국부가열을 통한 DP980 소재의 온간 V굽힘에서 발생하는 조직 및 경도 변화에 대한 연구
황준선(J. S. Hwang),이은호(E. H. Lee),이창환(C. W. Lee),양동열(D. Y. Yang),양우호(W. H. Yang) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
High strength steel is widely used to meet the needs of lightweight vehicle part. Because high strength steel has high strength, large amount of spring back after forming was generated. Near Infrared Ray (NIR) heater is one of the method to solve that problem. In this study, the microstructure and hardness of dual phase steel was measured in the V-bending test using NIR heater to check the degree of softening after local heating. To verify the hardness results of warm, v-bending, we compare the hardness of cold v-bended specimen with the hardness of heated and quenched specimen without bending And the tensile test according to heating time with fixed temperature of 600℃ was conducted to suggest the limit heating time.
고주파 국소강화 열처리에 관한 공정 및 기계적 특성 평가
심우정(W. J. Sim),최영림(Y. L. Choi),전형준(H. J. Jeon),양우호(W. H. Yang) 한국소성가공학회 2016 한국소성가공학회 학술대회 논문집 Vol.2016 No.4
최근 자동차 산업에서 환경규제 및 안전규제의 강화로 인해 초고강도 강의 적용이 급증하고 있다. 이에 따라 고온에서 가공하여 성형성 및 강도를 확보하고 경량화를 동시에 만족 할 수 있는 장점을 가진 핫스템핑 강판의 사용이 증가되고 있는 추세이다. 하지만 핫스템핑 강판은 소재의 가열과 고온소재를 성형하는 설비 등의 교체 주기 등과 같은 문제로 원가상승 및 고온 가공에 따른 생산성 저하가 발생하게 된다. 이를 보안하기 위해 본 연구에서는 핫스템핑 공정에 사용되는 보론강 소재를 사용하여 제품 형상으로 성형 후 고주파 유도가열을 통해 국소적 열처리하는 공정으로 개선하여 진행하였다. 고주파 유도가열 열처리 공정 시 효율을 향상시키기 위해 코일에 코어(core)를 장착하여 사용하였으며,열처리 공정 시 발생되는 온도와 기계적 특성을 파악하였다.