受压顶出充芯连铸成形技术的实验研究
Experimental Research of Continuous Casting Forming Technique with Pressed Ejection Core-filling
刘 柱， 梁 贺， 臧勃林， 吴春京
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作者单位：北京科技大学 材料科学与工程学院， 北京 100083
中文关键字：充芯连铸； 铜包铝； 受压顶出
英文关键字：core-filling casting; copper cladding aluminum; pressed ejection
中文摘要：在充芯连铸工艺原理的基础上，提出了制备外径为?准12 mm，内径为?准8 mm小尺寸铜包铝连铸复合坯的新工艺方法，即对铜液进行加压进而改善铜液冷却连铸成形的质量，成功制备了合格的铜包铝连铸复合坯。在现有的充芯连铸机上，自行设计了本实验装置，研究了Cu和Al的加热温度，Cu液充压的压力，二冷方式、强度，连铸复合坯的连铸速度等因素对充芯连铸成形的影响规律。结果表明：在铜的温度为1320 ℃、铝的温度为740 ℃、结晶器的冷却水量为4.6 L/min、二冷水量为0.67 L/min、铜液的充气压力为0.05 MPa、二冷位置离结晶器出口为 50 mm、连铸复合坯的连铸速度为25 mm/min时可以连铸出铜包铝复合坯，其表面质量光滑，铜铝的复合质量较好。
英文摘要：On the basis of core-filling continuous casting process theory, a new way of preparing small diameter copper cladding aluminum composite materials with 12 mm in outside diameter and 8 mm in inside diameter was put forward. Exerting pressure on the surface of copper fluid in order to improve forming quality, so the excellent copper cladding aluminum continuous casting billet was obtained. By self-designing experimental apparatuses, the factors including the temperature of copper and aluminum, the surface pressure of copper fluid, the ways and intensity of second cooling and the casting speed which influence the continuous casting forming were studied. The results show that the copper cladding aluminum composite materials with smooth surface and better interface between Cu and Al can be prepared under copper temperature 1320 ℃, aluminum temperature 740℃, cooling water speed 4.6 L/min in crystallizer, the second cooling water speed 0.67 L/min, copper fluid pressure 0.05 MPa, the distance away from crystallizer’s exit 50 mm and casting speed 25 mm/min.