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송명준(M. J. Song),권용철(Y. C. Kwon),이성환(S. H. Lee),강종훈(J. H. Kang) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
Internal defect of large scale forging is influenced by the steel quality and forging process and main researches are being made to minimize these quality problems. Previous researches verified that the effect of deformation ratio and effective strain are dominant among other factors. In this research, Tower flanges and wind turbine generator shafts manufacturing processes are investigated to quantify the relationship between deformation amount and internal defect. With 2cases of rigid-viscoplastic FE-analyses and production tests, internal defect rate of large forgings is linearly reduced on the effective strain increase.
풍력 발전기용 Door Frame의 제조 공정에 관한 연구
권용철(Y. C. Kwon),송명준(M. J. Song),강종훈(J. H. Kang),이성환(S. H.Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
The Door Frame is a gate to the wind turbine generator tower, and manufactured through forging or plate welding. Mechanical properties and fatigue characteristics of this product are very important. New manufacturing method is suggested in this paper for short production time, uniform quality, smooth surface, close tolerance, and considerable material savings as much as 30%. The rigid-viscoplastic three-dimensional finite element analyses were applied to new process design and the thickness distribution, shape of final product were investigated. The prototypes of door frame were manufactured based on analyzed results. Productivity was stable, mechanical properties was increased and product dimension was optimized with newly suggested process. With FE analysis and prototype production, the advantages of new method such as productivity, mechanical properties and production cost were verified.