什么样的零件适合使用MIM工艺?

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金属粉末注射成形结合了粉末冶金与塑料注射成形两大技术的优点,突破了传统金属粉末模压成形工艺在产品形状上的限制,同时利用塑料注射成形技术能大批量、高效率生产具有复杂形状的零件:如各种外部切槽、外螺纹、锥形外表面、交叉通孔、盲孔、凹台、键销、加强筋板,表面滚花等 这些都是MIM工艺的强项。

如何判定一个产品是否应该选择MIM工艺,表明有利于生产的几何形状特性的MIM零件例子目前主要有下列主要事项;

对于在切削加工和磨削加工中材料损耗非常、加工非常耗时的零件,MIM在降低生产成本上极有优势;模具费和研发费用对于低需求量的产品,分摊下来后是很难以承受的。因此,当产品的年需求量达到一定数量时,可以考虑选择MIM工艺。在材料方面,MIM工艺是一种近净成形技术,对于由钛、不锈钢及镍合金之类难易切削的材料设计的零件,MIM最有吸引力,同样的对于几何形状复杂的、在切削加工中需要变换很多次加工工位的多轴零件、多基准零件也极其适合。MIM也适合一些高密度的产品,如果使用性能有需求,则MIM的高密度形成的性能则有极强的竞争力;在精度要求方面,MIM烧结件的公差大概为±0.3%,如果产品要求的公差很严格,MIM烧结件就需要二次加工,如CNC,数控车等,MIM的成本也趋向于增高,这种情况下则需要评估比较,当然,MIM工艺也有些缺陷,必须使MIM固有的缺陷处于非关键位置,或制造成型后可以除去,例如浇口印迹,顶针印迹或结合线。

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