嵌埋式金屬複合塊材成形製備之有限元素研究

Finite Element Study in Preparing Core-Shell Type Metal Composite Bulk by Forming

范光堯(Kuang-Jau Fann) ； 彭立翰(Li-Han Peng)

《鍛造》 22卷4期 (2013/12) Pp. 13-19

摘要

輕量化為低碳設計之一方法，基於應用金屬複合塊材成為輕量化製品的可能需求，又現階段因其部分材料無完全包覆在內而使得應用範圍有所限制，因此本文欲探討嵌埋式金屬複合塊材製備之可行性。該製備製程先行以鋁合金6061後向擠製成套筒型包材，填入鋁合金7075作芯材後，再以前向擠製及精密鍛造等方法，使包材包覆芯材而成嵌埋式金屬複合塊材。本文以有限元素軟體DEFORM供模型建立與分析模擬，其中以剛塑性材料描述芯、包材，並依實驗設計方法訂出多組加工溫度與成形幾何參數，包括包材厚度、包材底部厚度與芯包材高度段差等，以探討其對嵌埋式金屬複合塊材製備的影響，包括介面應力應變分布、包材厚度分布與加工負荷等。期望初步成果能供日後開發使用，據以利於其它相關成形製程研究的展開。

關鍵字

嵌埋式金屬複合塊材 ； 鋁合金 ； 擠製 ； 鍛造 ； DEFORM

並列摘要

Lightweight is one of methods for low-carbon design. Based on the potential of metal composite bulks for lightweight applications and on the current situation of metal composite bulks, in which the interface between metals can be seen from their outside, this article therefore investigates the feasibility to produce core-shell type metal composite bulks. First, an aluminum alloy 6061 is backward-extruded to form the shell metal and then filled with 7075 metal, the core metal of the bulk. The core metal is subsequently encapsulated completely by using forward-extrusion or by precision forging. In this article, a finite element software DEFORM is used to simulate this process, in which both of core and shell metal are regarded as rigid-plastic. Thereby, an investigation on the stress and strain on the interface between metals, the geometry of the core metal, and the process load is taken with process parameters, such as the wall thickness and the bottom thickness of the shell metal, and the height difference between the core and shell metals. It is expected that the preliminary results can be helpful for future developments and applications with core-shell type metal bulks.

並列關鍵字

Core-Shell Type Metal Composite Bulk ； Aluminum Alloy ； Extrusion ； Forging ； DEFORM