钛合金叶片等温校正模具设计

Design of isothermal sizing die for titanium alloy blade

TC11钛合金叶片是航空发动机的重要部件之一,其型面复杂、质量要求高,在成形过程中常因锻造后的残余应力和温度应力的作用而发生翘曲变形,最终导致报废。采用等温校正工艺可使翘曲变形减少,叶片型面达到合格要求。本文采用三维设计软件Pro/E针对等温校正模具进行设计,主要解决模具型腔的造型问题,进行叶片的三维曲面造型,同时设计等温校正模的加热冷却装置。其设计流程为:创建叶片的三维实体→对叶身进行加放余量→利用实体创建模具型腔→添加模具结构件→设计加热冷却装置。

TC11 titanium alloy blade is one of aircraft engine important parts, its shape is complex and the quality requirement is high. The warps and the forgings may be discard due to the formed forging＇s remaining stress and the temperature stress. But it is possible to use the isothermal adjustment process to reduce the warp distortion and make the blade shape to meet the qualified requirements. Three dimensional design software Pro/E was used to carry on the design in view of the uniform temperature adjustment mold, and the mold cavity modeling problem was mainly solved. The three dimensional surface modeling of blade was carried out and the heating and cooling devices for the isothermal sizing die were simultaneously designed. Its design flow is： creating the three dimensional entity of the blade, adding on margin to the blade, using entity to set up the mold cavity, putting on the mold structural elements, and designing heaing and cooling system.