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홍재근(J. K. Hong),김정한(J. H. Kim),염종택(J. T. Yeom),박노광(N. K. Park) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
In terms of forming process, powder metallurgy (PM) process is regarded as one of the cost beneficial processes. The cold pressed and sintered processes have economic advantages resulting from lower cost powder, reduced material losses when compared with wrought processing, and mechanical properties approaching those of wrought materials. The processing of metal powder into finished strip by powder metallurgy (PM) based on roll compactions consists of the following unit operations: 1) Preparation of green strip from metal powder, 2) Sintering of the green strip, 3) Rerolling of the sintered strip, 4) Final cold rolling and annealing. The purpose of this paper is to research the influence of Ti powder size, particle size distribution, roll gap and roll speed on the densification of the Ti strip during roll compaction. And the microstructure of sintered Ti strip was investigated.
염종택(J. T. Yeom),김지훈(J. H. Kim),김정한(J. H. Kim),홍재근(J. K. Hong),이재식(J. S. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The hot forming process of a CAM for vessel engine was designed by finite element (FE) simulation and experimental analysis. An aim of process design was to achieve the near-net shaped CAM forgings by hot forging process. Based on the compression test results of the low alloy steel, deformation processing map was generated using the superposition approach between the dynamic materials model(DMM) and flow stability and/or instability criteria. From the processing map, the initial heating temperature was determined as 1200℃. FE analysis was simulated to predict the formation of rolling defects and deformed shape with different forging designs. Optimum process design suggested In this work was made by comparing with the CAM for vessel engine manufactured by actual forging process.