A286高温合金薄壁管件镦制工艺优化

Optimization on upsetting process for superalloy A286 thin-walled tube

针对某型A286高温合金薄壁管件的薄壁特征镦制成形过程中,容易出现折叠、填充不完全、飞边等问题进行了研究。提出了正挤压和反挤压两种材料流动方式,并利用Deforn-3D有限元软件进行数值模拟。对比分析了两种镦制工艺成形过程中的成形效果、等效应力、等效应变、金属流线和材料流动规律,数值模拟结果表明:与反挤压相比,正挤压成形制件的应力集中明显,金属流线紊乱,且有明显缺陷,采用反挤压镦制工艺更加合理。镦制实验结果表明,采用反挤压镦制成形的制件具有良好的几何特性,无填充不完全、折叠、飞边等缺陷,实验结果与数值模拟结果一致。

A study was conducted to investigate the occurrence of folding,incomplete flling and flashing during the thin-walled characteristic upsetting process of superalloy A286 thin-walled tube,and two material flow modes,namely forward extrusion and reverse extrusion,were proposed.Then,the forming processes were numerical simulated by finite element software Deforn-3D,respectively,and a comparative analysis was performed to assess the forming effects,equivalent stress,equivalent strain,streamline and material flow law during the forming process of the two upsetting processes.The numerical simulation results indicate that compared with the reverse extrusion,the stress concentration of the forward extruded parts is obvious,the streamline is disorderly,and it is accompanied by obvious defects,so it is more reasonable to adopt the reverse extrusion upsetting process.The upsetting experimental results show that the parts formed by the reverse extrusion upsetting process have good geometric characteristics,and there are no defects such as incomplete flling,folding and flashing.The experimental results are consistent with the numerical simulation results.