大型钛合金隔框等温闭式模锻成形工艺优化

Optimization on the Process of Large Titanium Bulkhead Isothermal Closed-Die Forging

摘要:

大型钛合金隔框锻件外形复杂，且要求尺寸精度高、内部质量稳定, 然而在锻造过程中极易出现充填不满、折迭、流线紊乱等缺陷。针对这些成形缺陷，基于DEFORM有限元软件，采用数值模拟方法研究钛合金等温闭式模锻成形过程坯料和加载方式优化对锻件成形质量的影响。研究表明：基于隔框材料流动特性优化得到的不等厚坯料，能较好地改善材料的充填性，使锻件满足尺寸精度要求。而局部加载方式可以有效地控制材料的流动，提高锻件的变形均匀性，消除由于材料流动不良造成的成形缺陷

Abstract:

Titanium bulkheads are widely used in the aviation and aerospace industry. This kind of parts are very complex, and meet high requirements for dimensional precision and the stabilization of inner quality. Some defects would be produced during the forming process, such as unfilling, overlapping, and the disturbance of forging flow line. In this paper, the effects of billet optimization and loading conditions on the forming quality during titanium alloy bulkhead isothermal closed-die forming process have been investigated, based on the rigid-viscoplastic finite element code, DEFORM-3D. The results show that the filling of die cavity can be effectively improved by using the billet with unequal thickness, which is obtained by the analysis of material flow, as a result, the dimensional precision can be satisfied for these parts. The local loading can make the deformation more uniform and eliminate the defects caused by bad material flow. The results obtained could provide a guide for proper loading scheme determining bulkhead forming