利用漿料法快速原型技術製作陶殼模

Manufacturing Ceramic Shell Mold with Slurry Rapid Prototyping Technology

周景澔(Ching-Hao Chou)

指導教授 ： 湯華興 ； 汪家昌

國立臺北科技大學/機電學院/製造科技研究所/碩士(2008年)

https://doi.org/10.6841/NTUT.2008.00486

摘要

本研究的目的在於分析「陶瓷雷射熔結法」與「陶瓷雷射燒結法」在製作工件過程中，產生分層現象的原因及解決方法；以及評估兩法應用於需要高強度工件與不需要高強度工件的可能性；最後，選擇適合的製程法並結合鑄造技術，製作不需要高強度且具有高透氣性質的直接澆注用模具。
研究結果顯示：面重疊率不正確為工件發生分層的眾多原因中，最直接的影響因素。影響面重疊率不正確的最主要因素為鋪層厚度不正確，而掃描參數誤差所引起的線變質深度不正確影響甚微。
使用雷射熔結法製作陶瓷工件易使工件產生熱裂痕跡，難以應用於製作高強度的工件。且熔結結構內多為封閉的孔洞，若應用於製作精密鑄造陶殼模，因其連通孔洞多數被熔解的液體塞住，會減少工件透氣性，此方面的應用顯然不如燒結法。使用雷射燒結法可製作出具有45vol％以上之高孔洞率陶瓷工件，且相連通孔洞最高可佔總孔洞的90vol％以上，應用於製作精密鑄造陶殼模可以有高的透氣度，極為適合。
實際製作直接澆鑄之陶殼模，在澆鑄的過程中陶殼具有良好的透氣性，幫助了金屬熔液的流動性，金屬鑄件並無氣孔的缺陷，且不論陶殼模或錫金屬鑄件，皆能有4μm左右（Ra）之良好的表面粗糙度。

關鍵字

陶瓷雷射熔結法 ； 陶瓷雷射燒結法 ； 孔洞率 ； 精密鑄造陶殼模

並列摘要

The aims of this study are firstly to find the reason and the solution of layer separation occurred in the processes of Ceramic Laser Fusion (CLF) and Ceramic Laser Sintering (CLS) and secondly to evaluate the possibility of applying these two processes to fabricate a work piece with high strength or with low strength; finally, a favorable process is selected and integrated into the casting technology to fabricate a direct casting mold which requires no high strength but high permeability.
The result shows that the incorrect planar overlap is one of the most important factors, which cause layer separation. The main reason which leads to incorrect planar overlap is the wrong layer thickness, while the influence of the incorrect scanning line depth which was induced by the deviation of the scanning parameters was minor.
Due to the thermal shock, the ceramic work piece fabricated with CLF always has cracks; CLF is not suitable for fabricating a work piece with high strength. If CLF is applied to fabricate a ceramic shell mold for precision casting, many interconnected pores are obstructed by the molten liquid and the amount of the closed pores is increased; therefore, the permeability is reduced. Obviously, this process is no better than the process of CLS. Using CLS process a ceramic work piece with high porosity of 45vol% can be built; the ratio of open pore to the total pore was up to 90vol%. CLS is suitable for manufacturing ceramic shell mold for precision casting because it has high permeability.
Actually, fabricating a ceramic shell mold for direct casting mold, the good permeability of the ceramic shell can improve the flow ability of the molten metal; the cast part has no defect such as pores. The surface roughness of both of the ceramic shell mold and the Tin cast component can be close to 4μm (Ra).

並列關鍵字

Ceramic Laser Fusion process ； Ceramic Laser Sintering process ； Porosity, ； Ceramic shell mold for precision casting

參考文獻

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