GH625高温合金管缩径旋压成形数值模拟及试验研究

基于ABAQUS/Explicit平台建立了高温合金管缩径旋压三维弹塑性有限元模型,对GH625高温合金管缩径旋压成形过程进行了模拟分析,研究了轴向进给速度、旋轮圆角半径、旋轮安装角度对高温合金管缩径旋压成形质量的影响规律。研究结果表明,高温合金变径管在旋压过程中,随旋轮的轴向进给,不同的区域截面变化趋势不同。对工艺参数进行分析,发现轴向进给速度及旋轮圆角半径增大时,壁厚增大;旋轮安装角度对零件壁厚无明显影响;进给速度越大或圆角半径越大,截面椭圆度越大;距自由端较远时,旋轮安装角度越小,截面椭圆度越大;随着旋轮的进给,距自由端越近,椭圆度波动越严重。最后,根据数值模拟结果确定最终工艺参数为轴向进给速度0.25mm/r,圆角半径取值2~4mm,旋轮安装角度为90o,并进行了高温合金管缩径旋压试验,得到了较好的成形件。

Numerical Simulation and Experiment Study on Tube Spinning of GH625 Reducer Tube

The elastic-plastic finite element model for the GH625 neck-spinning process was established by ABAQUS/Explicit software.The distribution of the stress,strain and the variation of the cross section of tube spinning process were analyzed.Furthermore,the effect of the spinning parameters on forming quality was obtained,such as axial feed rate,roller nose radius and roller installation angle.The spinning process results showed that the cross-sections in different zone of tube were generated different deformation.The results also reflected that the thickness increased with the increasing of the axial feed rate and roller nose radius.The roller installation angle had little influence on the tube thickness.The ellipticity became larger as the axial feed rate and roller nose radius increased.Located away from the free end,the ellipticity increased as the roller installation angle decreased.The distribution of the ellipticity was uneven when the roller was near the free end of the tube.Finally,the process parameters was selected based on the simulation:0.25mm/r of axial feed rate,2-4mm of roller nose radius,90° of roller installation angle.The experiment was conducted and the accuracy quality tube was manufactured by neck-spinning experiment.