臺灣博碩士論文加值系統

在鑄造過程之熱傳模式分析中，砂模與金屬界面熱傳情形是一關鍵性的問題，若無法妥善地處理此界面條件，會直接影響分析的結果。由於濕砂模與鑄件間非為緊密接觸，在模與金屬界面之熱傳方析中，需要一界面熱傳係數h來估算金屬的界面熱束。本文針對濕砂模鑄造實驗，使用鋁、A356鋁合金及90%Sn-10%Pb作為鑄造材料，以圓柱與長方體作為鑄件模型，用熱電偶量測出於砂模與金屬界面附近之溫度對時間的關係圖，利用逆運算法、顯性法、銅塊量測及總容量法等四種不同的計算法，計算出凝固過程中之砂模與金屬界面熱通量及界面熱傳係數。本文所使用的四種不同方法，提供研究相關領域多樣化的選擇，進而探討如何以簡易之方式，精確地估算出砂模與金屬界面熱通量及界面熱傳係數，以利於鑄造之熱傳分析。

In the heat-transfer analysis of a casting process, how to grasp the heat-transfer condition at the sand-mold/metal interface is a key problem. Not manipulated properly, it will directly affect the final result of the analysis. Because it is not perfect contact at the interface between green-sand mold and metal, the analysis needs an interfacial heat transfer coefficient to compute the heat fluxes from the metal to the sand mold at the interface. This paper is to study how to obtain the heat-transfer coefficient at the interface of green-sand mold casting. The casting geometries were cylinder and rectangle prism. The metal materials were aluminum, A356 aluminum alloy and Sn-10wt%Pb alloy. In the experiments, thermal couples were used to obtain the temperature data of measured points near the mold/metal interface. From these temperature data, the heat fluxes and heat-transfer coefficients at the interface were computed by applying the inverse, the explicit, the lump capacitance and Cu-assisted measurement methods. These four easy ways would provide a multiple choice for the future heat-transfer study of a casting process.

中文摘要 ……………………………………………….Ⅰ
Abstract ……………………………………………… Ⅱ
誌謝……………………………………………………….Ⅲ
目錄…………………………………………………..….IV
表目錄 ………………………………………………….Ⅵ
圖目錄 ………………………………………………….Ⅶ
符號說明 …………………………………………………Ⅹ
第一章 緒論 ……………………………………………..1
第二章 數值分析與界面熱阻分析……………………….4
2-1 金屬界面熱束之計算.……………………......4
2-1-1 逆運算模式……………………………………...5
2-1-2 顯性法(Explicit method)…………………....8
2-1-3 銅塊量測qmetal…………………………….....8
2-1-4 總容量法(Lump capacitance method)……....9
2-2 界面熱阻之分析……………………………....11
第三章 實驗設備與方法……………………………..…13
3-1 鑄造之實驗設備…………………………......13
3-2 砂模與木模之設計………………………………14
3-3 實驗方法與步驟………………………………..14
3-3-1 濕砂模鑄造實驗方法與步驟…………………..15
3-3-2 量測鑄件與砂模溫度分佈的方法……………..16
3-3-3 合模與澆鑄…………………………………....16
第四章 結果與討論……………………………………..17
4-1 鑄件凝固之縮孔問題…………………………..17
4-2 鑄件的溫度量測…………………………………18
4-2-1 純金屬鋁………………………………………..18
4-2-2 A356鋁合金……………………………………..19
4-2-3 90%Sn-10%Pb合金……………………………...19
4-3 金屬界面熱束之分析……………………………19
4-3-1 Beck逆運算法…………………………………..20
4-3-2 顯性法…………………………………………..21
4-3-3 銅塊量測qmetal………………………………..21
4-3-4 總容量法…………………………………………21
4-4 模與金屬界面熱傳係數之分析…………………22
第五章 結論……… …………………………………….24
參考文獻 …………………………………………………25
附錄A 錫鉛合金之潛熱式推導………………………..56
附錄B 性質表…………………………………………..59

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