K487合金内涵尾喷管的精铸工艺
Zhuzao/Foundry(2008)
Abstract
内涵尾喷管是某航天发动机的关键部件,采用可焊接铸造高温合金K487无余量整体精密铸造而成.内涵尾喷管铸件由内环、中环、外环、支撑板以及内层导向叶片组成,叶片最薄处仅为0.64 mm.该铸件是结构复杂的薄壁件,因此在铸造凝固过程中极易产生疏松、裂纹等缺陷,铸造难度大.本研究采用了组合夹具精密定位、蜡模分体组合成型的工艺方案,获得高尺寸精度和高表面质量的蜡模;通过优化浇注系统和浇注工艺的方法获得高冶金质量的铸件,很好地满足了设计和使用的要求.
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Key words
Inner-tailpipe nozzle,Investment casting,Superalloy K487,Technology
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