| 摘要: | 金屬注射成型（MIM）是一種結合了塑膠射出成型及粉末冶金技術優點的工藝技術，非常適合用於製造高強度、高精度和復雜幾何形狀的金屬零件。製造過程涵蓋了廣泛的技術，包括模具設計，粉末和黏合劑的混合、注塑、脫脂和後加工等。模具設計的成功將決定產品開發的成功與否，這將直接影響到MIM生產的效率及品質。然而，傳統的二維冷卻通道可能無法解決多穴模具溫度分佈不均勻的問題，並可能導致產品過熱及成型缺陷。在這項研究中，我們開發了一種用於 MIM 產品成型及製造的集成技術，包括用於模流分析的 MIM 模具開發技術、3D 隨形冷卻通道設計、金屬增材製造和 CNC 加工程序等。同時，通過實際的注塑試驗和分析，探討了該集成技術的可行性。最後，通過3D隨形模具冷卻系統的優化設計，可以提高MIM產品的冷卻效率和模具溫度的均勻性，這不僅成功地提高了產品的品質，並且也增加了成型程序的工作效率。;Metal injection molding (MIM) is a process technology that combines the advantages of plastic injection molding and powder metallurgy technology, which is very suitable for manufacturing
metal parts with high strengh, high precision and complex geometry. The manufacturing process covers a wide range of technologies, including mold design, mixing of powder and binder, injection molding, degreasing, sintering and secondary processing in the post-process. The success of mold design will determine the success of products development, which will directly affects the efficiency and quality of MIM production. However, the conventional 2D cooling channels may not be effected with the problem of non-uniform temperature distribution for multi-cavity molds, and may cause over heated, 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, 3D 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 3D conformal mold cooling system, the cooling efficiency of the MIM product and the uniformity of the mold temperature are improved, which not only successfully improves the product quality but also increase the working cycle of the molding process. |
