通过建立有限元模型,模拟钛合金半球超塑成形过程,分析吹塑压力、模具关键尺寸、吹塑工艺过程对半球壁厚均匀性的影响。证明在球壳超塑成形过程中,球壳壁厚不均匀性始终存在。预先反向吹塑,调整上、下模圆角尺寸和位置,确定适当的吹塑压力,可得到厚度较为均匀的球壳。 The finite element model was established to simulate the superplastic forming process of titanium alloy hemisphere. The influence of blow pressure, mold critical dimension and blow molding process on the hemispherical wall thickness uniformity was analyzed. It is proved that the uneven thickness of the spherical shell always exists during the superplastic forming of the spherical shell. Pre-reverse blow molding, adjust the upper and lower mold fillet size and location, to determine the appropriate blow pressure, get a more uniform thickness of the shell.