基于正交试验原理的钛合金环形气瓶超塑性成形过程的数值模拟

Numerical Simulation of the Superplastic Bulging Deformation of Titanium Alloy Annular Gas Cylinder Based on the Orthogonal Experimental Principle

运用刚(粘)塑性有限元方法和正交试验原理对钛合金环形气瓶的超塑性成形过程进行了数值模拟,分析了变形过程中板料的厚度、摩擦系数和环形毛坯的内外径尺寸等对成形件壁厚分布的影响规律,从而揭示了钛合金板材在气胀过程中的超塑性流变规律。基于对有限元数值模拟结果的分析,探索了钛合金环形气瓶超塑性成形过程中典型缺陷的形成机理,并给出了相应的消除缺陷的技术方案,通过有限元模拟和与实际情况的对比,证明了所提技术方案的可行性。

In the paper, by using on the plastic finite element and orthogonal experimental principle, the numerical simulation of superplastic forming process of titanium alloy annular gas cylinder is carried out. The effect regulations of sheet thickness, friction factor and the sizes of inner and external diameters of the annular blank on the thickness distribution of the formed part during deformation process are analyzed. The plastic flow regulation of Ti alloy plate during bulging is revealed. According to the analysis of the finite element simulation results, the formation mechanism of the typical fault of Ti alloy annular gas cylinder during superplastic forming process is discussed. The technical method to eliminate fault is given. Through comparison of the finite element simulation and actual situation, the feasibility of the technical method is proved.