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전만수(M. S. Joun),문호근(H. K. Moon),심상현(S. H. Shim),이민철(M. C. Lee),엄재근(J. G. Eom) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
In this paper, a ring rolling simulator, AFDEX / RING, based on a rigid-thermoviscoplastic finite element method is presented with emphasis on its remeshing capabilities. Key features of the simulator are introduced and several application examples including two cold ring rolling processes and a hot rolling process are given, which show the characteristics of the simulator.
권용철(Y. C. Kwon),김상열(S. H. Kim),김홍태(H. T. Kim),문호근(H. K. Moon),이세희(S. H. Lee),정상인(S. I. Jeong),양재규(K. G. Yang),김상식(S. S. Kim) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
Main Shaft is one of the key components to connect between Rotor hub and Gear box in wind turbine. The mechanical components for wind turbine is most being manufactured with hot open die forging. The purpose of this study is to develop the manufacture process of Hollow Main Shaft by open die forging. In case of the open die forging for large forged part, pass schedule of manufacture process is most important because it can affect final dimensions of product. In this paper, hot compression tests were carried out to obtain the flow stress of cast microstructure at different temperature and strain rates. The measured flow stress dates were used to simulate the upsetting, piercing, pipe forging and final flange upsetting process of cast ingot using the practical material properties. Also the mechanical properties after forging of Hollow Main Shaft were investigated from the experiment. From the results, the prototypes of Hollow Main Shaft were manufactured based on analyzed results, productivity was stable, mechanical properties was increased and product dimension was optimized with suggested process. With FE-Analysis and prototype, the advantages of new method (hollow type) such as material utilization, mechanical properties and production cost were verified.
임정숙(J. S. Lim),이영선(Y. S. Lee),문호근(H. G. Moon),문영훈(Y. H. Moom) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
By hot compression test in the temperature range of 800-1100℃ and the strain rate range of 0.01-10 s?¹, hot deformation behavior of Ti-6Al-4V was characterized. And processing maps including flow stability criteria and Ziegler’s stability criterion were generated using the compression test data. In order to evaluate the reliability of the map, the microstructure characteristics of the hot compressed specimens were correlated with test conditions in the stable and unstable regime. The microstructure and processing map of Ti-6Al-4V was applied to predict an optimum condition and unstable regions for hot forming processes.
임정숙(J. S. Lim),이영선(Y. S. Lee),문호근(H. G. Moon),문영훈(Y. H. Moon) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
Radial forging is a unique process used for forging of round and tubular components. This operation has been used extensively in both hot and cold forging operations. Since radial forging operations have certain specific advantages as compared to other alternatives, process improvement is required. And this process is often compared to open die forging. Therefore, in this paper, mechanical properties of STD11 forged bar manufactured by both open die forging process and radial forging process were compared.