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격자형 금형에 의한 알루미늄 후판 열간성형에서 치수정도 개선을 위한 잔류응력 제어
손영기(Y. K. Son),이찬주(C .J. Lee),윤종헌(J. H. Yoon),이정환(J. H. Lee),손동환(D. J. Son),권일근(I. G. Gwon),김병민(B. M. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
A hot forming of aluminum plate using a grid type die is a forming process to make a shell plate for the production of a spherical LNG tank. This process is characterized by using a grid-type die with an additional air cooling system for reducing the cooling time of the heated plate after hot forming. The thermal residual stress caused by deviation of temperature distribution between inside and outside of aluminum plate influences considerably on the dimensional accuracy of product. Shape of the hot formed aluminum plate is recovered by this unexpected residual stress. Thus, the control of temperature condition in cooling step is very important to improve the dimensional accuracy of hot formed aluminum plate. In this study, the FE-analysis of hot forming with grid type die is performed to evaluate the effects of stress distribution of aluminum plate in cooling sten on the dimensional accuracy of final product.
손영기(Y. K. Son),김재홍,이찬주(C, J. Lee),고대철(D. C. Ko),변상덕(S. D. Byoen),김병민(B. M. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
The objective of this study is to design the press forming process to prevent the tearing of the polymer laminated steel. The occurrence of PET tearing cannot predict using conventional forming limit diagram (FLD). Therefore, tearing limit diagram (TLD) of the polymer laminated steel was proposed to determine safe region without the tearing. Based on the concept of FLD, the tearing limit curve was established with the critical major and minor strains at which tearing occurred in various deformation modes. Based on the TLD, FE-analysis of a press forming process was conducted to find the forming condition without tearing. The validity of the press forming process was verified by forming experiment. The comparison between the FE-analysis and experimental results indicated that the TLD is efficient and suitable for the design of the press forming process of polymer laminated steel.
Cohesive zone model을 이용한 접착 power steering cylinder 개발
손영기(Y.K. Son),이찬주(C.J. Lee),이상곤(S.K. Lee),고대철(D.C. Ko),H. Schafer,이종만(J.M. Lee),김병민(B.M. Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Adhesively bonded power steering cylinder with steel tube and aluminum bracket was developed to reduce the weight of steering system. To achieve the joint strength between steel tube and aluminum bracket, the shape aluminum bracket re-designed by using FE-analysis. The fracture behavior of adhesive layer is considered by cohesive zone model(CZM), which is based on two-parameter fracture phenomenon with critical stress and fracture toughness. From the result of FE-analysis with CZM, re-designed power steering cylinder was satisfied desired joint strength for axial and torsion modes. And its joint strength was verified by fracture test for each mode.
Al 후판의 곡면성형 시 치수정밀도 향상을 위한 격자 금형 설계
손영기(Y. G. Son),이찬주(C. J. Lee),윤종헌(J. H. Yoon),이정환(J. H. Lee),손동환(D. H. Son),권일근(I. K. Kwon),김병민(B. M. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
A hot forming of large thick AI plate using a grid type die is a process to make a shell plate for the production of a spherical LNG tank. This process is characterized by using a grid typed die with an additional air cooling system for reducing the cooling time of the heated plate after hot forming. The purpose of this study is to suggest the design technique of grid typed die for improvement of dimensional accuracy. Grid type die of this study is designed by spline and DA(Displacement adjustment) method to determine the size of grid and curvature of die. Suggested technique is verified by the experiment of spherical forming for Al5083 thick plate.
냉간압연에서 Edge-cracking발생 예측에 관한 연구
손영기(Y. K . Son),이상호(S. H . Lee),이종빈(J. B. Lee),이성진(S. J. Lee),김병민(B. M . Kim) 한국소성가공학회 2009 압연 심포지엄 Vol.2009 No.4
The rolling of flat slabs or sheet metal is probably the most advanced technique of metalworking technology. In spite of this very intensive activity, the problem if edge cracking has not been resolved. Although edge cracking is a major industrial problem, relatively little well-documented experimental work has been published on subject. Despite the paucity of exact experiments, it is reasonably certain from published data that three causes contribute to its occurrence (1) limited ductility of the rolled material (2) uneven deformation at the edges and (3) variations in stresses along the width of the rolled material, particular near the edge. The present study was carried out to show the generation of edge cracking using ductile fracture criteria and FE-simulation. The validity o f simulated results was verified by rolling experiments of steel strip.
LNG 탱크용 Al5083 후판의 열간 곡률 성형해석 및 실험
손영기(Y. G. Son),이찬주(C. J. Lee),윤종현(J. H. Yoon),이정환(J. H. Lee),권일근(I. K. Kwon),김병민(B. M. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
A hot forming of large thick AI plate using a grid type die is a process to make a shell plate for the production of a spherical LNG tank. This process is characterized byusing a grid typed die with an additional air cooling system for reducing the cooling time of the heated plate after hot forming. The purpose of this study is to suggest the design technique of grid typed die for improvement of dimensional accuracy. Grid type die of this study is designed by spline and DA(Displacement adjustment) method to determine the size of grid and curvature of die. Suggested technique is verified by the experiment of spherical forming for Al5083 thick plate. A hot curvature forming of thick AI plate using a grid type die is a process to make a shell plate for a spherical LNG tank. This process is characterized by using a grid type die with an additional air cooling system for reducing the cooling time of the heated plate after hot forming. The objective of this study is to establish the FE-analysis technique to predict the thermal deformation and temperature change of Al plate. To verify the efficiency of the FE-analysis technique developed in this study, experiment of the hot curvature forming process is conducted for a I 183×790x20t(mm) model. The results showed that the dimension and temperature of the plate in the analysis agrees well with that of the experiment within 1.25mm and 20.08℃ , respectively.