油封被廣泛使用於工業界，其目的為可防止傳動機構內部的潤滑流體洩漏及隔絕外界汙染物。現今因油封型式繁多，常會因特殊機器所需求開發新式油封。若使用傳統金屬模具以壓鑄成形的方式來生產客製化油封成品，無形中會使加工成本與時間增加。因此本研究嘗試以快速模具的技術設計並製造油封模具，來減少加工成本與時間。
本研究以澆鑄成形的方式來製作油封。所需的快速模具是參考傳統油封模具的設計及加上簡易脫模的概念，並利用層加工技術中的SDM(Shape Deposition Manufacturing)製程，完成快速模具各零件的製作，挑選適當的矽橡膠材料，成功製作出油封成品。經由快速模具的設計與製作，之後針對油封產品開發快速模具建立了一套標準製作流程，另將此流程應用於其它型式油封快速模具的製作，其快速模具與傳統金屬模具相較下，具有成本較低及加工時間較短的優勢。最後將本研究所製作的油封成品以動態測試實驗測試其耐久性，與一般市售油封成品相較下，本研究製作的油封成品其密封性能稍差，主要原因為矽橡膠材料基本特性差異所造成，但因油封型式廣泛且工作環境的條件不一，故可嘗試將本研究使用的矽橡膠材料運用於不同型式油封的製作，預期能達到一定的密封效果。

Oil seal has been widely used in the industry to prevent lubricants from leaking and to isolate outside pollutants. There are many types of oil seals in the market, yet many new types are required to meet special demands. Utilizing traditional die casting approach with metal molds to generate new types of oil seal with small quantity may be costly and time-consuming. Therefore, in this research, rapid tooling technology was adopted to fabricate oil seals in order to reduce cost and time.
This study utilizes polymer casting as forming method to make oil seal; hence, a polymer rapid tool can be used. The mold design referred to traditional molds, and also considered the ease of de-molding. SDM (Shape Deposition Manufacturing) process, a layered manufacturing technique, was applied to rapidly fabricate various parts of the mold. An appropriate silicone material was selected, and oil seals were successfully produced through the rapid tool. A set of standard operating procedures (SOP) for generating rapid tooling for oil seal was then established. Moreover, the SOP was adopted to generate the other type of oil seal, with the advantages of lower cost and shorter mold fabrication time comparing to traditional metal molds. Lastly, dynamic tests were conducted to compare oil seals created in this research with the commercial one. Due to the material differences, the commercial oil seal had better performances. Since the working environment and conditions of oil seals are various, our approach can still apply to certain types of oil seal to meet sealing requirement.

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