飽和度對金屬射出成形製程中毛細吸附脫脂之影響

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鄭嘉雄(Jian-Xong Zhen ) 查詢紙本館藏

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機械工程研究所

論文名稱

飽和度對金屬射出成形製程中毛細吸附脫脂之影響

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摘要(中)

金屬粉末射出成形中最複雜、也最耗時的毛細吸附脫脂過程是決
定產品良窳甚巨的重要製程之一。其不僅許多缺陷容易在此製程產
生，而且也是限制整個金屬射出成形產能的主要關鍵。
在毛細脫脂的過程中，當黏結劑因毛細力脫離胚體時，流動波前
會有指狀效應的產生。因此，在各個位置和時間會有不同的飽和度值
加入影響脫脂時間的參數。本文探討飽和度對整個毛細吸附脫脂機制
的影響。以數值模擬胚體和吸附材內部之黏結劑受毛細吸附作用後，
整個脫脂過程之壓力場和飽和度的分佈，並且預測毛細吸附脫脂的時
間，再將數值結果和沒有考慮飽和度時做比較。

摘要(英)

Wick-debinding process is the most intricate and time consuming
step in metal injection molding (MIM). It is not only the source of many
defects, but also the key point of the limitation in MIM process.
During the removal of the binder from the compact in wick-debinding
process, the fingering defect will occur on the flow front of the molten
binder. Therefore, there are different saturation at each place and affect the
total wick-debinding time. In this study, we discuss the influence of the
saturation to wick-debinding mechanism. The numerical method is used to
simulate the probability of pressure field and saturation on compact and
binder by wick-debinding process, and predict the wick-debinding time.
we also compare the relationship between with and without saturation
effect.

關鍵字(中)

★ 毛細吸附脫脂
★ 達西定律
★ 金屬射出成形
★ 飽和度

關鍵字(英)

★ Darcy’s law
★ metal injection molding
★ wick-debinding

論文目次

摘要…………………………………………………………………… Ⅰ
英文摘要……………………………………………………………… Ⅱ
目錄…………………………………………………………………… Ⅲ
表目錄………………………………………………………………… Ⅴ
圖目錄………………………………………………………………… Ⅵ
符號說明……………………………………………………………… Ⅶ
第一章、序論………………………………………………………… 1
1-1 簡介…………………………………………………… 1
1-2 MIM 的製造程序 …………………………………… 2
1-3 MIM 的工程問題 …………………………………… 3
1-4 文獻回顧……………………………………………… 9
1-5 研究目標……………………………………………… 17
第二章、理論模式…………………………………………………… 20
2-1 基本假設……………………………………………… 20
2-2 統御方程式的建立…………………………………… 20
2-3 飽和度………………………………………………… 21
2-4 毛細吸附脫脂機制之預測…………………………… 22
2-5 孔隙率………………………………………………… 23
2-6 滲透率………………………………………………… 23
2-7 毛細壓力……………………………………………… 24
2-8 無因次參數…………………………………………… 25
IV
第三章、數值方法…………………………………………………… 26
3-1 數值技巧……………………………………………… 26
3-2 數值計算流程………………………………………… 27
3-3 格點獨立性…………………………………………… 28
第四章、結果與討論………………………………………………… 29
4-1 數值模擬結果………………………………………… 29
4-2 無因次分析…………………………………………… 30
4-3 粉末粒徑對脫脂時間的影響………………………… 31
第五章、結論………………………………………………………… 33
第六章、參考文獻…………………………………………………… 35
表……………………………………………………………………… 42
圖……………………………………………………………………… 44

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指導教授

洪勵吾(Lih-Wu Hourng)

審核日期

2001-7-17

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