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題 名 | A356鋁合金消失模型鑄造法之流動性研究=A Study on the Flowability of the Evaporative Pattern Casting A356 Al Alloy |
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作 者 | 廖高宇; 潘永寧; | 書刊名 | 鑄工 |
卷 期 | 24:4=99 1998.12[民87.12] |
頁 次 | 頁69-84 |
分類號 | 472.2 |
關鍵詞 | 流動-凝固方程式; 特性冷激區; Flow-solidification; Characteristic chill zone; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究探討 EPC 製程 A356 鋁合金之充模流動性。實驗參數包括:澆鑄溫度、模 型密度、塗層厚度、抽氣條件、模型厚度和不同流路系統設計等。研究結果顯示流動長度隨 澆鑄溫度的提高和模型厚的增加而增加; 增加塗層厚度和模型密度時則會縮短流動長度; 澆 鑄時輔以抽氣時,幾可使流動長度增加為兩倍; 增加實心豎澆道高度對流動性的影響不大, 但採用空心豎澆道時則可大幅增加流動長度; 增加豎澆道截面積可增加流動性,但有其上限 ; 而頂澆充模方式之流動長度皆比側澆充模者為長。 Flemings 之流動-凝固方程式係適用於空模穴之狀況, 在本研究中適度修正了 Flemings 之方程式,而推導出適用於消失模型鋁合金之流動方程式,如下式所示:(省略) EPC 鋁合金之充模方式基本上是以緩慢穩定、循序漸進的方式流動,因此,金屬熔液與保利 龍模型的熱交換(即保利龍液化或氣化所吸收的熱量)侷限在熔液流動的前緣,本研究定義 此熱交換區為 " Characteristic Chill Zome" (特性冷激區), 並得知此 "Characteristic Chill Zone" 之長度, lc,與模型 ╱ 鑄件厚度, tp,之比值為 1.2( 水平充模)或 2.2 (垂直充模)。 |
英文摘要 | In this study the influence of serveral processing parameter, including the pouring temperature, the coating thickness, the pattern denity, the gating system design and the application of vacuum, on the flowability of EPC A356 alloy has been invetigated. The findings obtained indicate that the flowability of EPC A356 alloy is positively affected by the pouring temperature, the pattern thickness and the application of vacuum, while negatively affected by the coating thickness and the foam pattern density. However, no significant effect of sprue height and gating ratio or gating system dimensions on flowability has been observed. Also, regression equations have been obtained to correlate the flow length of EPC A356 alloy plate castings with the related parameters for both vertically oriented (top gated) and horizontally oriented (side gated) patterns. In addition, Flemings' flow-solidification equation derived originally for conventional empty cavity molds has been modified by taking into account the factors specifically associated with the EPC process to suit for the application in the EPC process. The derived flow-solidification equation is given as: (省略) |
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