金屬粉末射出成型(Metal injection molding, MIM)為一種結合塑膠射出成型與粉末冶金工藝優點的製程技術，適合成型高精度、高強度、幾何形狀複雜的金屬零件。其製程由粉末與黏結劑之混煉、模具設計、射出成型、至後製程之脫脂、燒結與二次加工，涵蓋技術範圍甚廣。而模具設計的成敗決定產品開發的成敗，直接影響MIM生產技術的效率及品質，但傳統2D冷卻水路可能不容易解決多模腔模具溫度分佈不均勻的問題，而造成產品的成型缺陷。本研究發展一整合性技術針對MIM產品的成型製造，其技術為模流分析、隨形水路設計、金屬積層製造和CNC加工之MIM模具開發技術，並透過實際射出成型試驗與分析，探討此一整合性技術的可行性。最終，藉由模具冷卻系統之優化設計，提高MIM產品的冷卻效率與模具溫度的均勻性，不僅成功縮短生產的製程週期，並且提升產品品質。

Metal injection molding (MIM) is a process technology that combines the advantages of plastic injection molding and powder metallurgy technology, and that is suitable for manufacturing metal parts with high precision, high strength and complex geometry. The manufacturing process covers a wide range of technologies, including mixing of powder and binder, mold design, injection molding, degreasing, sintering and secondary processing in the post-process. The success of mold design determines the success of product development, which directly affects the efficiency and quality of MIM production technology. However, conventional 2D cooling channels may not be easy to deal with the problem of non-uniform temperature distribution for multi-cavity molds, and may cause shaping defects of the product. In this study, we develope an integrated technology for the MIM product shaping and manufacturing, including MIM mold development technology for mold flow analysis, conformal cooling channel design, metal additive manufacturing and CNC processing. Also, through actual injection molding test and analysis the feasibility of this integrated technology is discussed. Finally, through the optimized design of the mold cooling system, the cooling efficiency of the MIM product and the uniformity of the mold temperature are improved, which not only successfully shortens the production process cycle, but also improves the product quality.

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