某型商用航空发动机用承力支板属于大尺寸的薄壁空腔结构件。 采用熔模精密铸造，容易出现疏松、裂纹 和轮廓度超差严重等问题，冶金质量和尺寸控制难度较大。 通过浇注系统设计、陶瓷型芯定位和浇注工艺的控制及优 化，解决了铸件的冶金缺陷和尺寸问题，提高了铸件的成品率。

Bearing strut for a certain type of commercial aeroengine belongs to the large size thin-walled cavity structure. It is easy to have some casting defects such as loose, crack and out of contour when adopting investment casting. It is difficult to control the quality and size of metallurgy. Through the design of casting system, the location of ceramic core and the control and optimization of casting process, the metallurgical defects and size problems of casting were solved and the yield of casting was improved.