基于Simufact模拟的复杂异形截面环件辗扩变形

Ring rolling deformation of complex irregular section ring based on Simufact simulation

基于Simufact模拟建立了大型复杂异形截面环件的两步辗扩有限元模型,分析了两步辗扩过程中环形构件的等效应变和温度分布规律。结果表明:环件的等效塑性应变和温度分布极不均匀,内轮廓辗扩过程中环件的等效应变由内外表面到中部区域逐渐变小,温度由环件表面向心部区域逐渐升高,最低温度达762.512℃;在环件外台阶辗扩过程中,环件等效塑性应变由端面4个棱角区向环件下半部分心部逐渐变小,其温度分布情况与环件内轮廓辗扩温度分布规律大致相同,最低温度达818.441℃。采用两步辗扩获得了整体充满效果较好、辗扩过程稳定且符合设计要求的大型复杂异形截面环件,证实了模拟结果可为大型复杂异形截面环件两步辗扩成形工艺的实际生产提供理论依据。

Based on Simufact simulation,a finite element model of two-step ring rolling for large complex irregular section ring was established,and the equivalent strain and temperature distribution laws of ring component in the two-step ring rolling process were analyzed.The results show that the distributions of equivalent plastic strain and temperature of ring is extremely uneven.The equivalent plastic strain of ring gradually decreases from the inner and outer surfaces to the middle region during the inner profile ring rolling process,and the temperature of ring gradually increases from the surface of ring to the center region.The lowest temperature is 762.512 ℃.However,in the process of outer step ring rolling,the equivalent plastic strain of ring gradually decreases from the four corners of end surface to the center of lower part for ring,and its temperature distribution is roughly the same as that of the inner profile rolling of ring,with the lowest temperature of 818.441 ℃.A large complex irregular section ring with good overall filling effect,stable rolling process and meeting the design requirements is obtained by two-step ring rolling,which confirms that the simulation results can provide theoretical basis for the actual production of the two-step ring rolling process for large complex irregular section ring.