摘要
某型号K465合金熔模精密铸造涡轮导向器是由内环、外环、内锥、法兰和叶片5部分构成,最大直径Ф331mm,叶片数多达31个,且外环及内锥壁厚相差悬殊,叶片最薄处仅为0.7mm。由于该部件的结构特点,所以极易在内锥处出现疏松,以及在叶片排气边产生裂纹。设计采用合理的浇注系统及对型壳面层进行晶粒细化的工艺方案,很好地解决了铸件内锥疏松及叶片裂纹等问题。采用模具分体压制,精密夹具组合定位,蜡模拼装组合成型的工艺方案,很好地解决了涡轮导向器熔模的成型问题,并简化了模具结构,降低了模具制造成本。采用适当的模壳温度和浇注温度,浇注出的铸件冶金质量优良,很好地满足了设计和使用要求。
The turbine nozzle casted by K465is comprised by five parts,which are an inner ring,an outer ring,an endocone,a flange and vanes.The max diameter of the unit is Ф331mm and the number of the vanes with the thinnest part of which only about 0.7mm thickness is 31.According to this special structure,the porosity of the turbine nozzle′s inner ring and the cracks of the turbine nozzle′s vanes are two mainly issues.The suitable gating system was used,which solved porosity issues effectively.The grain refiner can solve crack issues by improving shell strength.The investment pattern molding problem was solved by using aprecise holding device,through which each individual wax units made by mould-parting technique was assembled accurately.Furthermore this method not only simplified the mould structure but also reduced the cost of mould making and solving the vanes shifting problem.In order to manufacture castings with high metallurgical quality and meet the design and use demands,moderate mould shell temperature and high pouring temperature were used.
作者
李杨
韩凤奎
陈兴福
刘浩然
吴剑涛
李俊涛
LI Yang;HAN Feng-kui;CHEN Xing-fu;LIU Hao-ran;WU Jian-tao;LI Jun-tao(Gaona Aero Material Co..Ltd..Beijing 100081,China)
出处
《金属功能材料》
CAS
2020年第4期66-70,共5页
Metallic Functional Materials
