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文章提出采用一对对称共面平行布置的锥辊形成等厚辊缝,对等厚面内弯曲环形件进行成形的新方法。基于ABAQUS平台建立三维弹塑性有限元模型,对工艺成形过程进行模拟,分析成形机理及成形规律。结果表明,等厚面内弯曲的成形机理为,板带内外缘材料流动差异导致的不均匀伸长变形和板带中部材料在锥辊几何约束与面内弯矩共同作用下的不均匀变形协调。对于3A21O铝合金板带,成形参数显著影响等厚面内弯曲成形过程和成形结果,其影响程度顺序为放料位置z>板带宽厚比b0/t0>辊缝大小δ>摩擦系数μ。
In this paper, a new method of forming equal-thick-surface bending ring members by forming a pair of symmetrical and coplanar conical rollers to form equal thickness roll gap is proposed. Based on the ABAQUS platform, a three-dimensional elasto-plastic finite element model was established to simulate the forming process and analyze the forming mechanism and forming rules. The results show that the forming mechanism of isosceles in-plane bending is the non-uniform deformation caused by the difference of material flow between the inner and outer edges of the strip and the non-uniform deformation of the central strip material under the combined constraint of cone roller geometry and in-plane bending moment . For the 3A21O aluminum alloy strip, the forming parameters significantly affect the isoplasty bending process and the forming result. The order of influence is the discharge position z> strip width ratio b0 / t0> roll gap δ> friction coefficient μ.