基于起皱分析的钛合金异形盒件缺陷控制研究

Research on defect control of titanium alloy irregular box parts based on wrinkle analysis

针对钛合金异形盒零件成形起皱问题开展研究,对零件热成形过程中失稳起皱的原理进行分析,结合鼓动产生前后接触压力矢量分布情况得到成形过程中材料流动趋势以及褶皱产生的原因。通过监测零件成形过程中受压侧褶皱折弯角度及零件最大应变情况,发现在合模间隙为6 mm时零件发生失稳变形。对该状态下零件型面进行光顺,设计出零件2道次成形的过渡工装型面,并对工装排布与毛料结构进行优化,最后进行试验验证,成形后的零件贴模间隙为0~0.15 mm。结果表明,改进后的工艺方法将零件变形进行分解,使材料变化均匀,过渡型面消除了成形过程中的褶皱问题,实现了零件的精确成形。

The research was conducted to investigate the wrinkling problem in the forming of titanium alloy irregular box parts.The principle of instability wrinkling during hot forming process of the parts was analyzed,and the material flow trend during forming process and the reasons for the generation of wrinkles were obtained by combining the distribution of contact pressure vectors before and after bulging.It is found that the parts experience instability deformation when the mold gap is 6 mm by monitoring the bending angle of the pressed side wrinkles and the maximum strain of the parts during the forming process.The parts surfaces were smoothed under this condition,and the transitional tooling surfaces for the two-stage forming of the parts were designed.The tooling layout and raw material structure were optimized.Finally,the experimental verification was conducted.The mold gap of part is 0-0.15 mm after forming.The results show that the improved process method decomposes the part deformation,resulting in uniform material changes,and the transitional tooling surfaces eliminate the wrinkling problem during the forming process,achieving precise forming of the parts.