K424合金扩张调节片是某型号冲压发动机尾喷管核心部件,属于典型的大尺寸薄壁结构件。该调节片采用熔模铸造工艺整体铸造成形,在生产过程中,铸件易产生疏松、裂纹及底板膨胀变形等缺陷,冶金质量控制难度很大。通过优化铸件浇注系统和造型工艺,有效消除了调节片的裂纹、疏松和膨胀变形等缺陷,铸件的合格率大幅度提升。 K424 alloy expansion regulator is a model of the core part of the nozzle nozzle, is a typical large-size thin-walled structural parts. The adjusting piece adopts the investment casting process to cast and shape as a whole. During the production process, the castings are prone to defects such as looseness, cracks and expansion and deformation of the bottom plate, and the metallurgical quality control is very difficult. By optimizing casting casting system and molding process, the flaws such as cracks, looseness and expansion deformation of the adjusting piece are effectively eliminated, and the passing rate of the casting is greatly improved.