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ECAP-Conform을 활용한 연속 하이브리드 공정 개선
주호선(H. S. Joo),황선광(S. K. Hwang),백현무(H. M. Baek),임용택(Y. T. Im),손일헌(I. H. Son),배철민(C. M. Bae) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
A continuous hybrid process is combined with wire-drawing, equal channel angular pressing (ECAP) and rolling process as a continuous severe plastic deformation technique to manufacture high-strength wires. In this study, ECAP Conform process was applied instead of ECAP and rolling processes in the continuous hybrid process to improve applicability of the process. The round groove in the feeding roll of the ECAP-Conform was used to manufacture circular shape wires. For verification of the designed process, finite element analysis was carried out with various shear friction factors of the workpiece with the given feeding roll and dies. This approach could be helpful in reducing the roll jumping and buckling involved with the continuous hybrid process.
황선광(S. K. Hwang),백현무(H. M. Baek),주호선(H. S. Joo),김신회(S. H. Kim),임용택(Y. T. Im),손일헌(I. H. Son),배철민(C. M. Bae) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
In this work, a multi-pass continuous hybrid (CH) process is designed and its practicality is investigated for manufacturing high performing low-carbon steel wires in a continuous way. For this purpose, the multi-pass CH process was experimentally set up and applied up to five passes with route A at room temperature and was compared with those for the multi-pass wire drawing(WD) process. According to the present investigation, the grain-refined wires, which have many well defined high angle grain boundaries, with the enhanced ultimate tensile strength and comparable ductility were successfully produced by the five-pass CH process compared to the WD process. In addition, the fatigue limit of the specimen produced by the CH process was enhanced due to the grain-refined microstructure of the specimen compared to the one of the WD process. Based on these observations, it was found that the multi-pass CH process can effectively produce a fine-grained wire with enhanced mechanical properties compared to the WD process.
이정완(J. W. Lee),황선광(S. K. Hwang),백현무(H. M. Baek),임용택(Y. T. Im),손일헌(I. H. Son),배철민(C. M. Bae) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
In this study, an asymmetric drawing process is designed as a new process to manufacture high-strength wires. It is the same process with conventional wire-drawing except for geometry of drawing dies. To compare the asymmetric drawing and wire-drawing, three-dimensional finite element analyses were carried out. Effective strain of the asymmetric drawing was higher than the one of the wire-drawing. For verification of the designed process, experiments of the asymmetric drawing and wire-drawing with the same reduction of area per each pass were conducted with low carbon steel. Tension test results showed that UTS value of the drawn wires by the asymmetric drawing was higher than the one of the conventional wire-drawing. This result indicated that the asymmetric drawing process could manufacture high-strength wires compared to the conventional wire-drawing.