A new variotherm molding apparatus is presented in this paper for the fabrication of high aspect ratio 316L stainless steel micro-structures using micro powder injection molding (mu PIM) technology. The molding apparatus prototype includes an injection mold in which a silicon insert with an array of 24 x 24 ( 576) microcavities is mounted, a set of rapid tempering systems for the mold and a set of vacuum systems. The key advantage of this molding apparatus lies in the real-time monitoring and rapid adjustment of the mold cavity temperature during injection molding and part ejection, which makes molding and demolding of high aspect ratio green micro-structures possible. For example, incomplete filling occurs while injection molding micro-structures of 60 mu m x height 191 mu m with an aspect ratio of 3.2 using a conventional mold. In comparison, smaller micro-structures with higher aspect ratio are produced successfully in the case of the new molding apparatus, e. g. micro-structures of 40 mu m x height 174 mu m with an aspect ratio of 4.35 and 20 mu m x height 160 mu m with an aspect ratio of 8 were molded successfully.
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机译:本文介绍了一种新的恒温成型设备,该设备使用微粉末注射成型(mu PIM)技术制造高纵横比的316L不锈钢微结构。成型设备原型包括一个注塑模具,该模具中安装了具有24 x 24(576)个微腔阵列的硅插件,一套用于模具的快速回火系统和一套真空系统。该成型设备的主要优点在于在注模和零件顶出过程中实时监控和快速调节模腔温度,这使得高纵横比的生坯微结构的成型和脱模成为可能。例如,当使用常规模具将长宽比为3.2的60μmx高191μm的微结构注塑成型时,会发生不完全填充。相比之下,在新的模制设备的情况下,例如,成功地生产了具有较高长宽比的较小的微结构。 G。成功地成型了长宽比为4.35的40μmx高174μm和长宽比为8的20μmx高160μm的微结构。
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