GH4169弯头热推扩成形有限元模拟及验证

Finite element simulation of hot-push forming and confirmation on GH4169 ring pipe

为了获得比较理想的热推加工参数,采用有限元法对变形高温合金GH4169热推扩成形过程中金属流动及变形特点进行了分析,揭示了选用恰当的工艺参数是热推扩成形获得等壁厚弯头的关键,并研究了扩径比K、弯曲角α、温度及推制速度的影响规律.结果表明:利用模拟分析可得出优化后的参数,即K=1.3及α=40%、推制速度v=3mm/s、加热温度800℃;通过网格法分析计算,经热推扩成形后GH4169合金壁厚偏差可控制在6%以内.说明利用优化的成形参数可制备出等壁厚GH4169合金弯头,为批量生产工艺制定提供了依据.

In order to obtain ideal thermal processing parameters and deformation of high temperature alloy GH4169 was investigated using finite element software to thermal expanding forming process of the metal flow and deformation characteristics are analyzed,and reveals the implementation of appropriate process parameters such as thermal expanding forming the wall thickness bend the key.The influence law of expanding diameter ratio,bending angle,temperature and pushing speed on forming process was studied.The results show that optimized parameters obtained by simulation analysis are following：K=1.3,α=40°,v=3 mm/s,T=800℃.Analysis and calculation by grid method,the thickness deviation of GH4169 alloy wall thickness can be controlled within 6% after the hot push and expansion.It is shown that the forming optimized parameters can be used to prepare the wall thickness elbow of GH4169 alloy,and provide the basis for the batch production process.