TC4钛合金半球零件超塑成形的有限元模拟  

Finite Element Simulation of Superplastic Forming of TC4 Titanium Alloy Hemispherical Part

作　　者：李运硕 周雨威 熊成悦 孙燕 李永兵 LI Yunshuo;ZHOU Yuwei;XIONG Chengyue;SUN Yan;LI Yongbing(China Academy of Machinery Science and Technology Group Co.,Ltd.,Beijing 100044,China;State Key Laboratory for Advanced Forming Technology and Equipment,Beijing National Innovation Institute of Lightweight Co.,Ltd.,Beijing 100083,China)

机构地区：[1]中国机械科学研究总院集团有限公司,北京100044 [2]北京机科国创轻量化科学研究院有限公司,先进成形技术与装备国家重点实验室,北京100083

出　　处：《机械工程材料》2023年第6期96-102,共7页Materials For Mechanical Engineering

基　　金：中国机械总院技术发展基金资助项目(912202Q9);燃烧、热结构与内流场重点实验室基金资助项目(SY41YYF202209054)。

摘　　要：建立TC4钛合金半球零件超塑成形有限元模型,研究了恒温条件下正向气胀和先反向后正向气胀成形对半球零件壁厚的影响;基于温度场修正的Backofen本构方程,模拟了在非均匀温度场条件下半球零件的超塑成形并分析了其壁厚分布。试制出TC4钛合金半球零件,通过实测壁厚对模拟结果进行验证。结果表明:先反向后正向气胀成形工艺有利于半球零件壁厚的均匀分布,降低了零件的壁厚最大减薄率;非均匀温度场条件下半球零件壁厚均匀程度较恒温条件下低;相比于恒温条件,非均匀温度场条件下半球零件壁厚的模拟结果与实测结果更接近,平均相对误差为4.7%,半球零件中心点处壁厚的相对误差也仅为6.1%。Finite element model for superplastic forming of TC4 titanium alloy hemispherical part was established,and the effect of direct bulging and bidirectional bulging forming on the wall thickness of the hemispherical part under constant temperature was studied.The superplastic forming process of the hemispherical part under non-uniform temperature field was simulated based on the temperature field modified Backofen constitutive equation,and the wall thickness distribution was analyzed.The TC4 titanium alloy hemispherical part was producted,and the wall thickness was measured to verity the simulation.The results show that the bidirectional bulging forming process was beneficial to the uniform distribution of thickness of the hemispherical part and reduced the maximum thinning rate of thickness of the part.The uniformity degree of thickness of the hemispherical part under non-uniform temperature field was lower than that under constant temperature.Compared with that at constant temperature,the wall thickness simulation of the hemispherical part under non-uniform temperature field was closer to the measured results;the average relative error was 4.7%,and the relative error of the wall thickness at the center point of the hemispherical part was only 6.1%.

关 键 词：超塑成形 TC4钛合金 壁厚分布 数值模拟 非均匀温度场 

分 类 号：TG146.23[一般工业技术—材料科学与工程]