Shape Casting - 4th International Symposium 2011
Shape Casting - 4th International Symposium 2011
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成型铸造 - 2011 年第四届国际研讨会
DOI：
10.1002/9781118062050.ch32
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Dai X
中科院分区：
文献类型：
--
作者：
Dai X
传统铸造厂不仅经常使用批量熔炼，将铝合金熔化并在熔炉中长时间保温，而且还使用重力砂型铸造工艺，使用钢包将熔化的铝合金从熔炉转移到浇注站并浇注到模具中。在充模过程中，由于重力的作用而产生的湍流充模行为很容易使液体表面的氧化膜破裂并陷入液体中。另外，在熔化和充填过程中，液体表面与周围空气的长时间接触也会增加氢的吸收水平。所有上述因素往往是铸造缺陷产生的主要原因。本文介绍了一种新颖的 CRIMSON 铝铸造方法，该方法具有许多优点。它取代重力充型方法，采用单射向上铸造方法，实现快速熔化和快速反重力充型模具操作，减少了熔体与环境的接触时间，从而降低了缺陷产生的可能性。另一个优点是由于缩短了熔化和填充时间而大幅降低了能耗。使用模拟软件 FLOW-3D 将 CRIMSON 方法与传统重力铸造工艺进行比较。以拉伸棒案例作为样品来模拟填充过程。
The conventional foundry not only frequently use the batch melting where the aluminium alloys are melted and held in a furnace for long time, but also use the gravity sand casting process where the melted aluminium alloys are transferred using a ladle from furnace to pour station and are poured into a mould. During filling a mould the turbulent filling behaviour due to gravity is easily to make the oxide films on the surface of the liquid cracked and trapped into the liquid. Also the long exposing time of the liquid surface with the around air during melting and filling will increase the level of hydrogen absorption. All of the abovementioned factors are often the main reasons for casting defect generation. In this paper, a novel CRIMSON aluminium casting method is introduced which has a number of advantages. Instead of gravity filling method, it uses the single shot up-casting method to realize the rapid melting and rapid counter-gravity-filling mould operations which reduce the contact time between the melt and environment thus reducing the possibility of defect generation. Another advantage is the drastic reduction of energy consumption due to shortened melting and filling time. A simulation software, FLOW-3D, is used to compare the CRIMSON method with the conventional gravity casting process. A tensile bar case is used as a sample to simulate the filling process.