高温合金薄壁扭转异型管液压压制成形

Hydro-pressing forming of superalloy thin-walled torsional special-shaped tube

针对管材截面形状异型以及管坯存在扭转角度造成的成形困难问题,结合内高压成形和压制成形提出液压压制成形法。对异型管件液压压制成形过程进行理论分析和实验研究,采取正交实验模拟方案,探究管坯初始压力、最大压力、整形时间对GH4169高温合金薄壁管成形过程管坯最大减薄率和最大回弹量的影响显著性。结果表明:初始压力和整形时间分别对管坯减薄率和回弹量影响最大;最大压力对管坯减薄率和回弹量影响不显著。获得了最优参数组合,将管坯壁厚分布和回弹效果与实验结果进行了对比,回弹对零件成形影响较小,回弹误差可被控制在1%以内,截面周长误差为0.47%~0.8%;最大减薄发生在凸面中间区域,并且凸面壁厚分布均匀,模拟结果与实验结果一致。

Aiming at the problem of the difficulties in forming caused by the special-shaped section of tube and the torsion angle of tube blank,the hydro-pressing forming method was proposed combining with the hydroforming forming and pressing forming.The theoretical analysis and experiment research on hydro-pressing forming process of special-shaped tube were carried out,based on the simulation scheme of orthogonal experiment,the significance of the effects of initial pressure,maximum pressure and shaping time on maximum thinning rate and the maximum springback of tube during the forming process of GH4169 superalloy thin-walled tube was investigated.The results show that the initial pressure and shaping time have the greatest influence on thinning rate and springback of tube respectively.The influence of the maximum pressure on thinning rate and springback of tube is not significant.The optimal parameter combination was obtained,and the distribution of wall thickness and the effect of springback were compared with the experimental results.The springback has little effect on the forming of parts,the springback error is controlled within 1%,the cross-section circumference error is 0.47%-0.8%.The maximum thinning occurs in the middle area of convex surface,and the wall thickness distribution of convex surface is uniform,the simulation results are consistent with the experimental results.