航空发动机用高温合金复杂薄壁精密铸件尺寸精度控制技术研究进展OA北大核心CSTPCD

Superalloys are predominantly employed to crucial aviation hot-end components such as turbine rear casings,diffusers,and pre-swirl nozzles.The investment casting technology supersedes"casting + welding"forming approaches,which reduces the number of parts and processing procedures,offers improved reliability and mass reduction.Therefore,investment casting is a pivotal technology for aviation component manufacturing.However,the casting of complex thin-walled components encounters challenges with dimensional accuracy,impacting engine aerodynamic performance and assembly precision,which has become a bottleneck problem restricting the manufacturing quality of key structural components of aero-engines in China for a long time.This article reviews the current advancement in the dimensional accuracy control for superalloy investment castings at home and abroad.A forward-looking analysis and discussion on development trends are conducted,particularly focusing on digital and intelligent technologies.There is an urgent need to build a digital twin platform for investment casting in the future and to develop more advanced accurate,quantitative and intelligent prediction methods for dimensional deformation and die profile design theory.