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題名 | Preliminary Die Design for Extrusion of Compressible Porous Materials=可壓縮性孔隙材料擠製模雛形之簡便設計法 |
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作者姓名(中文) | 羅斯維; | 書刊名 | 力學 |
卷期 | 12:3 1996.09[民85.09] |
頁次 | 頁353-362 |
分類號 | 440.2 |
關鍵詞 | 擠製法; 孔隙材料; 切片法; Extrusion; Porous material; Slab method; |
語文 | 英文(English) |
中文摘要 | 近年來可壓縮性孔隙材料(如鋁超合金等)已被用來製造許多具有特殊性質的元 件,然而我們對其加工成形之特性卻仍十分瞭解。無論是以有限元素法或是上界限法來分析 其成形過程,皆失之於繁瑣或是過份簡化。 有鑑於此,本文提出一結合材料密度、應力分佈及速度場的擠製模雛形之簡便設計法,可以 探討模具的幾何參數與界面摩擦力對材料固縮率之影響。能方便地獲得模具之初步外形卻又 不失其精確度。文中發現長而角度高的模具有助於材料的固縮,因此允許業者使用低密度之 原料以降低成本;而增加界面摩擦力雖然亦能夠加強固縮效應,卻需損失較多之能量。 |
英文摘要 | A comprehensive but convenient slab method for designing the extrusion die for porous materials is proposed. Different from the conventional slab method, the stress filed is coupled with the velocity increments and the relative density in this paper. The influences of the interfacial friction and the die angularity on the relative density are also investigated. It is found that longer dies of greater angularities are more effective in increasing the relative density in the extrusion processes, and therefore billets of lower density (or cost) can be used. Friction also increases the efficiency of consolidation but higher power consumption is needed. |
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