금형 냉각이 Al-Mn계 다중압출 평판관의 압출 특성 변화에 미치는 영향
Effects of die cooling on change of extrusion characteristics of Al-Mn-based thin-walled flat multi-port tube
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
In order to increase the extrusion production speed of aluminum, extrusion die cooling technology using liquid nitrogen has recently attracted a lot of attention. Increasing the extrusion speed increases the temperature of the bearing area of extrusion dies and the extrusion profile, which may cause defects on the surface of extruded profile. Extrusion die cooling technology is to directly inject liquid nitrogen through a cooling channel formed between the die and the backer inside the die-set. The liquid nitrogen removes heat from the die-set, and gaseous nitrogen at the exit of the channel, covers the extrusion profile of an inert atmosphere reducing the oxidation and the profile temperature. The aim of this study is to evaluate the cooling capacity by applying die cooling to extrusion of Al-Mn-based aluminum alloy flat tubes, and to investigate the effects of die cooling on the change in extrusion characteristics of flat tubes. Cooling capacity was confirmed by observing the temperature change of the extrusion profile depending on whether or not die cooling is applied. To observe changes in material characteristics due to die cooling, surface observation is conducted and microstructure and precipitate analysis are performed by FE-SEM on the surface and longitudinal cross section of the extruded flat tubes.
Abstract
In order to increase the extrusion production speed of aluminum, extrusion die cooling technology using liquid nitrogen has recently attracted a lot of attention. Increasing the extrusion speed increases the temperature of the bearing area of extrusion dies and the extrusion profile, which may cause defects on the surface of extruded profile. Extrusion die cooling technology is to directly inject liquid nitrogen through a cooling channel formed between the die and the backer inside the die-set. The liquid nitrogen removes heat from the die-set, and gaseous nitrogen at the exit of the channel, covers the extrusion profile of an inert atmosphere reducing the oxidation and the profile temperature. The aim of this study is to evaluate the cooling capacity by applying die cooling to extrusion of Al-Mn-based aluminum alloy flat tubes, and to investigate the effects of die cooling on the change in extrusion characteristics of flat tubes. Cooling capacity was confirmed by observing the temperature change of the extrusion profile depending on whether or not die cooling is applied. To observe changes in material characteristics due to die cooling, surface observation is conducted and microstructure and precipitate analysis are performed by FE-SEM on the surface and longitudinal cross section of the extruded flat tubes.
참고문헌 (17)
- 최재혁, "CO2 기반 금형 급속 냉각기술의 수치해석적 연구", Design & Manufacturing, 17(3), pp.61~66 (2023), 한국금형공학회[DOI]
- 이세호, "CO2 냉각모듈을 적용한 고곡률 성형품의 사출금형 급속냉각", Design & Manufacturing, 16(4), pp.67~74 (2022), 한국금형공학회[DOI]
- 임동욱, "금형 냉각 최적화를 위한 기체 보조 냉각", Design & Manufacturing, 12(1), pp.18~25 (2018), 한국금형공학회[DOI]
- 김병민, "금형냉각법에 따른 열간 단조 금형의 수명 평가", 소성∙가공, 12(4), pp.408~413 (2003), 한국소성∙가공학회
- Choi, S. C., "Heating and cooling channel design of cross-shaped die for warm forming of magnesium alloy sheet", Proceedings of Korean Society for Technology of Plasticity Conference 2008, (Spring), pp.370~373 (2008)
- Zheng, K., "Effect of cooling rate on the phase transformation and post strength of Ti-6Al-4V under hot forming conditions: Experiments and modelling", Journal of Alloys and Compounds, 972, pp.172868~ (2024)[DOI]
- Dong, F., "Enhanced deep drawing formability and deformation mechanism of aluminum alloy at cryogenic temperature", Journal of Alloys and Compounds, 968, pp.171992~ (2023)[DOI]
- Huang, K., "Cryogenic die-less spinning of aluminum alloy thin-walled curved components and microstructure evolution", Journal of Manufacturing Processes, 92, pp.32~41 (2023)[DOI]
- Vazdirvanidis, A., "Examination of the effect of cooling rate after extrusion to formability of 6061 automotive profiles", Applied Sciences, 13(6), pp.3763~ (2023)[DOI]
- 고대훈, "Al6061 합금의 열간 압출공정에서 금형 냉각시스템에 의한 압출재의 결정립 성장 제어", 대한기계학회논문집 A, 33(7), pp.673~680 (2009), 대한기계학회
- Dae-Hoon Ko, "Improvement of mechanical properties of Al6061 extrudate by die cooling with N₂gas during hot extrusion", Journal of Mechanical Science and Technology, 27(1), pp.153~161 (2013), 대한기계학회
- Reggiani, B., "Prediction of liquid nitrogen die cooling effect on the extrusion process parameters by means of FE simulations and experimental validation", Journal of Manufacturing Processes, 41, pp.231~241 (2019)[DOI]
- Pelaccia, R., "Assessment of the optimization strategy for nitrogen cooling channel design in extrusion dies", Key Engineering Materials, 926, pp.460~470 (2022)[DOI]
- 이상용, "알루미늄 7075 합금의 압출에서 금형 냉각이 압출재의 표면 결함에 미치는 영향", 열처리공학회지, 35(6), pp.319~326 (2022), 한국열처리공학회
- 성상규, "금형 냉각과 압출 속도가 7075 합금 압출에 미치는 영향에 대한 현상학적 분석", 열처리공학회지, 34(4), pp.185~190 (2021), 한국열처리공학회[DOI]
- Fang, W., "Optimization of die design for thin-walled flat multi-port tube with the aid of finite element simulation", Journal of Materials Processing Technology, 277, pp.1116418~ (2020)[DOI]
- 강태훈, "개량 Al-0.7Mn 합금의 미세조직, 고온 변형 거동 및 성형성", 소성∙가공, 31(6), pp.365~375 (2022), 한국소성∙가공학회[DOI]