航空接头锻件等温锻压成形工艺

Study on isothermal forging process for aviation joint forging

为了提高航空锻件的综合性能,通过等温锻压工艺研究了航空接头锻件的成形过程,采用Deform3D有限元软件对高筋薄壁铝合金航空接头锻件的锻压成形工艺进行了仿真研究,在实验室油压机上开展了缩比(1∶5)锻件的成形工艺实验.研究结果表明:在坯料与模具温度均为450℃、成形速度为0.1 mm/s的等温模锻工艺下,材料变形抗力比常规热模锻降低70%,材料在模腔中的流动性提高,锻件充填完好,锻件变形均匀,应力集中降低;等温锻造工艺可使锻件获得流线顺畅、晶粒细小、力学性能优良的纤维组织,避免了热模锻易出现的涡流、折叠、穿流、充填不满等锻造缺陷;仿真与实验结果吻合,为航空接头锻件锻压成形工艺的制订提供了依据.

To improve the comprehensive performance of aviation forging,a simulation of an air joint forging forming process for Al-alloy aviation joint forging with high rib and thin wall by isothermal forging technology was done by using Deform 3D software,and the experiment of the scaled（1∶ 5） forging was carried out in laboratory＇s hydraulic press.The results show that under the condition of isothermal forging process with the billet and die temperatures of 450 ℃ and the forming speed of 0.1 mm/s,the material deformation resistance decreases by 70% in contrast to the conventional warm forging process,and the material flow ability in the cavity are improved.The deformation of forging is uniform and the stress concentration decreases significantly.The fibrous structure with smooth flow lines,fine grain and excellent mechanical properties can be obtained by isothermal forging process and the warm die forging＇s defects,such as vortex,folding,fibre breaking,unfilling and so on,can be avoided.The simulation results agree with the experimental results,which provide an important basis for the aviation joint forging＇s forming process.