使用直接冷铸技术生产铝棒的启动阶段

Kardo Rajagukguk, S. Suyitno, H. Saptoadi, Indraswari Kusumaningtyas, U. A. Salim, B. Arifvianto, M. Mahardika
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摘要

直接冷却(DC)铸造被认为是生产铝合金坯料最有前途的铸造方法之一。该工艺是将铝金属浇注到水冷模具中。当熔融铝与模具直接接触时,坯壳开始形成(这也被称为一次冷却)。然后,以规定的铸造速度向下拉动起始块,以获得所需的铝坯。直流铸造过程中的启动阶段被认为是一个关键步骤,因为它可能决定铸造产品中缺陷的形成。本研究旨在调查直流铸造启动过程中形成的铝合金铸造缺陷。结果表明,随着起始块的向下运动,铸坯未能成型。同时,由于浇注温度过低、模具形状不圆、热顶和石墨环质量差以及浇注过程中进入模具的水等因素,铸坯有粘在模具壁上的趋势。它还注意到在直流浇注过程中出现的浇注缺陷的几个标记,如液化或渗漏、冷折、坯体卡在模具中、对接结构和粗糙的坯体表面。
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The Start-Up Phase of Aluminum Billet Production Using Direct Chill Casting
Direct chill (DC) casting has been considered as one of the promising casting methods that can be used to produce aluminum alloys billet. The process is conducted by pouring aluminum metal into a water-cooled mold. The billet shell begins to form when molten aluminum contact directly with the mold (this is also known as primary cooling). Afterward, the starting block is pulled downwards at a specified casting speed to achieve desired aluminum billet. The start-up phase during the DC casting process is considered a crucial step since it may determine the formation of defects in the casting products. This research aims to investigate the casting defects on the aluminum alloy that were formed during the start-up process of DC casting. The results show that the billet failed to form following the downward movement of starting block. Meanwhile, the billet tended to stick to the mold wall due to several factors, such as too low a pouring temperature, a less-round mold shape, the poor quality of the hot top and graphite ring, and the water that entered the mold during the casting process. It also noted several markers of the casting defects that occurred during the DC casting process such as liquation or bleeding, cold folding, billet stuck in the mold, butt structure, and rough billet surface.
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