【摘要】 研究了TC11钛合金叶片盘的近净热流变成形。采用几何造型软件UG NX3对TC11钛合金第二级叶片盘的坯料和模具进行实体造型,同时基于刚粘塑性不可压缩材料的变分原理,运用体积分析软件DEFORM 3D对3种不同应变速率下的叶片盘等温近净热流变成形过程进行数值模拟,研究了工件在成形过程中的速度场、温度场和等效应变场的分布情况,以及凸模和凹模的载荷-行程曲线,为优化工艺参数提供了理论依据。同时与传统的方法进行了比较,发现用此方法生产的产品,其力学性能及微结构都有明显的改进。结果分析表明,随着变形速率的减小,金属向凹模型腔内的流动越均匀,叶型更容易充满。更多还原

【Abstract】 The near-precision thermo-rheological forming of the TC11 titanium alloy vane disk has been studied.The dies of rheological forming were 3D-modeled based on UG and the near-precision thermo-rheological forming of the TC11 titanium alloy under a certain temperature and a low strain rate was analyzed by DEFORM 3D based on variation principle of rigid viscoplastic non-compressed material.A series of results including rheological forming procedure,equivalent strain field,temperature field and load-stroke curves of punch and concave die,were obtained by finite element method.The deformation characteristic of the TC11 titanium alloy was well known and its thermo-rheological forming process and parameters were determined.Moreover,the mechanical properties and microstructures of the products produced by this new technique are improved evidently compared with that produced by traditional method.更多还原