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在脊槽部位填充材料的方法能够有效抑制双脊矩形管绕弯成形过程中的截面变形,但弯曲结束后刚性模具和填充材料的卸载对管坯截面变形存在一定影响。基于ABAQUS有限元平台,建立了脊槽填充材料的双脊矩形管H型绕弯成形和卸载回弹过程有限元模型,并通过试验验证模型的可靠性。基于该模型,研究获得了双脊矩形管绕弯和卸载回弹前后截面各部位变形的变化规律。结果表明:刚性模具的卸载使各特征截面不同部位最大变形率发生不同程度的减小;填充材料去除后,截面最大变形又有不同程度的增大;除脊槽高度变形外,卸载回弹最终使截面变形得到改善;变形量较大的60°特征截面上不同节点处的变形值在卸载回弹前后的变化存在显著差异。
The method of filling material in the ridge groove can effectively suppress the cross-section deformation of the double-ridge rectangular tube during the bending forming process. However, the unloading of the rigid mold and the filling material after the bending has some influence on the deformation of the tube billet. Based on the ABAQUS finite element platform, a finite element model of H-turn bending and unloading rebound process of double-ridge rectangular tube with ridge filling material was established, and the reliability of the model was verified through experiments. Based on the model, the variation of the deformation of each part of the double-ridged rectangular tube before and after the bending around the unloading and springback was obtained. The results show that the unloading of rigid mold reduces the maximum deformation rate in different parts of the characteristic sections to different extents; the maximum deformation of the section increases with different degrees after the filler material is removed; So that the deformation of the cross section is improved. The deformation values at different nodes with larger deformation of 60 ° cross section have significant differences before and after unloading rebound.