5A06铝合金中厚板的拉深变形行为

发布时间：2018-04-25 04:14

本文选题：A铝合金 + 中厚板　；参考：《中国有色金属学报》2015年07期

【摘要】：由于弯曲效应,中厚板拉深时厚度方向存在明显应力梯度,使其与薄板拉深变形有所不同。通过有限元数值模拟,研究中厚板拉深变形过程中不同阶段板材厚度方向的径向应力分布规律,揭示凹模圆角大小对中厚板拉深变形径向应力的影响规律。对厚度4.5 mm的5A06铝合金板材进行不同凹模圆角条件下内径为450 mm筒形件拉深实验研究。结果表明:中厚板拉深过程中最大径向应力位于直壁区与凹模圆角过渡处;且随凹模圆角的增大,最大径向应力值逐渐减小;破裂缺陷发生在凹模圆角与直壁区过渡处,且随凹模圆角增大,破裂延缓发生,极限拉深行程显著提高,凹模相对圆角为12时的极限深度比相对圆角4.5时的提高了83%。
[Abstract]:Due to the bending effect, there is an obvious stress gradient in the thickness direction of the plate during drawing, which makes it different from the deep drawing deformation of the thin plate. By means of finite element numerical simulation, the radial stress distribution law of plate thickness direction in different stages of plate drawing deformation was studied, and the effect of die angle on radial stress of plate drawing was revealed. The deep drawing experiments of 450mm cylindrical parts with different die angles were carried out on the 5A06 aluminum alloy plate with a thickness of 4.5mm. The results show that the maximum radial stress is located at the transition between the straight wall and the corner of the die during drawing, and the maximum radial stress decreases gradually with the increase of the angle of the die, and the fracture defect occurs at the transition between the corner and the straight wall of the die. With the increase of the angle of the die, the rupture is delayed, and the limit drawing stroke is obviously increased. The limit depth of the die relative to the angle of 12:00 is 833 times higher than that of the relative angle of 4.5.
【作者单位】：哈尔滨工业大学金属精密热加工国家级重点实验室;哈尔滨工业大学材料科学与工程学院;
【基金】：长江学者和创新团队发展计划资助项目(IRT1229) 国家自然科学基金资助项目(51375114)
【分类号】：TG306;TG146.21

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