大型钛合金中介机匣蜡模一体化制备技术研究  

Research on Wax Mold Integrated Preparation Technology for Large Titanium Alloy Intermediate Casing

作　　者：郄喜望 潘思源 杨冬丽 殷亚军[1] 计效园[1] 周建新[1] QIE Xiwang;PAN Siyuan;YANG Dongli;YIN Yajun;JI Xiaoyuan;ZHOU Jianxin(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China;BAIMTEC Material Co.,Ltd.,Beijing 100095,China)

机构地区：[1]华中科技大学材料成形与模具技术全国重点实验室,武汉430074 [2]北京航空材料研究院股份有限公司,北京100095

出　　处：《航空制造技术》2024年第23期65-71,共7页Aeronautical Manufacturing Technology

基　　金：国家重点研发计划(2022YFB3706800)。

摘　　要：中介机匣是航空发动机的重要部件。熔模铸造具有尺寸精度高、冶金质量可控和一体化成型的特点,是目前在机匣制造中应用最广泛的特种铸造方法。型壳制备是熔模铸造过程中的关键工序,对制壳过程中的工艺参数进行合理的控制和调配可以很大程度减少蜡模缺陷的产生。本文应用关节臂扫描法观测蜡模的部分形变,试验研究不同压射参数对蜡模表面质量的影响。分析钛合金中介机匣熔模铸造的技术难点,介绍熔模铸造的物性参数对铸件质量的影响,揭示了不同参数间相互作用的现象与机理。结果表明,物性参数对铸件质量的影响是错综复杂、相互关联的。对于大型薄壁复杂结构零件,采用强度更高的模料压制蜡模,能够减小蜡模面缩及蜡模自身的变形。蜡模表面流痕缺陷可以通过射蜡参数来改善,但会引入其他缺陷;然而提高温度会造成蜡模尺寸减小,可能会加剧复杂不稳定结构变形。The intermediate casing is an important component in aero-engine.Investment casting with high dimensional accuracy,controllable metallurgical quality,and characteristics of integral forming is currently the most widely used special casting method.Shell making is a key process in investment casting.Reasonable control and adjustment to process parameters during shell making can greatly reduce the rejectrate.This study applied joint arm scanning to observe partial deformation of wax patterns,studied the influence of different parameters on the surface quality of wax patterns through pouring experiments.The technical challenges of investment casting for titanium alloy intermediate casings were analyzed,the influence of physical parameters on casting quality was introduced,revealing the phenomena and mechanisms of interactions between different parameters.The results indicate that the influence of physical parameters on casting quality is complex and interrelated.For large,thin-walled and complex structural parts,using higher-strength mold materials to make wax pattens can reduce surface shrinkage and deformation of the wax molds.Surface flow mark defects on wax molds can be eliminated by adjusting wax injection parameters,but this may introduce other defects.Increasing the temperature can reduce the size of the wax pattens and may exacerbate deformation in complex and unstable structures.

关 键 词：钛合金 熔模铸造 中介机匣 一体化成型 

分 类 号：TG249.5[机械工程—精密仪器及机械] V263[金属学及工艺—铸造]