GH4169高温合金锥形机匣冷旋成形规律

Cold spinning law on superalloy GH4169 conical casing

针对高温合金因室温加工硬化现象严重而导致旋压成形时易产生的破裂、表面波纹等缺陷,以锥形机匣构件为研究对象,探究其冷旋成形规律。基于Simufact平台建立了有限元模型,采用模拟与实验相结合的研究方法,模拟分析了多道次旋压过程中机匣构件等效应力和等效塑性应变的变化规律、壁厚的分布特征及工艺参数(道次间距p、旋轮进给比f、芯模转速n)对旋压件壁厚的影响,揭示了其成形规律。结果表明:工件顶部平板区Ⅰ区的等效应力、等效塑性应变沿径向突变,且边缘在中后期出现一定的应力集中和变形;斜壁区V区的等效应力、等效塑性应变沿轴向分层分布,沿周向分布均匀,且随着旋轮的进给和道次的增加而逐渐增大,最大值均位于工件端部Ⅳ区。斜壁区V区的壁厚总体呈先减小后增大的趋势,中部过度减薄,工件端部Ⅳ区壁厚达到最大值;壁厚均匀性随旋轮进给比和道次间距的增大呈上升趋势,芯模转速对壁厚影响不显著。实验结果与模拟分析一致,验证了模拟研究的可靠性。

Aiming at the defects such as cracks and surface ripples during the spinning process due to serious work hardening phenomenon at room temperature of superalloys,for the conical casing component,the law of cold spinning was studied.Then,based on the Simufact platform,a finite element model was established,and the change laws of equivalent stress and equivalent plastic strain,the distribution characteristics of wall thickness and the influences of process parameters(pass spacing p,rotary wheel feeding ratio f,mandrel rotate speed n) on the wall thickness of spinning parts for casting component during the multi-pass spinning process were simulated and analyzed by combining simulation and experiment.Furthermore,the forming laws were revealed.The results show that the equivalent stress and equivalent plastic strain in zone I of the top plate zone of workpiece suddenly change along the radial direction,and a certain stress concentration and deformation appear in the middle and late stages of edge.The equivalent stress and equivalent plastic strain in the zone V of inclined wall area are distributed in layers along the axial direction and evenly distributed along the circumferential direction,and gradually increase with the increasing of rotary wheel feeding and number of passes,and the maximum value is located in the zone IV at the end of workpiece.The wall thickness in the zone V of inclined wall area generally shows a trend of decreasing first and then increasing,and the middle part is excessively thinned,and the wall thickness in the zone IV at the end of workpiece reaches the maximum value.The uniformity of wall thickness shows an upward trend with the increasing of rotary wheel feeding ratio and pass spacing,and the mandrel rotate speed has no significant effect on the wall thickness.The experimental results are consistent with the simulation analysis,which verifies the reliability of the simulation research.