塑性强化材料辊式矫直力学行为研究

发布时间：2018-01-03 08:05

本文关键词：塑性强化材料辊式矫直力学行为研究　出处：《机械工程学报》2016年18期 　论文类型：期刊论文

【摘要】：采用弹塑性弯曲理论与应力线性叠加原则对塑性强化材料连续弹塑性弯曲过程力学行为进行分析,考虑应力传递效应对矫直过程的影响,建立七辊辊式矫直机连续弹塑性弯曲矫直过程力学模型。通过对比试验结果及理论计算值,两者偏差平均值在8%以内,验证了理论分析方法的正确性。利用该模型,对不同的矫直策略进行分析。结果表明,大变形矫直策略残余应力与残余曲率控制能力均强于小变形矫直策略;由于应力传递效应对矫直过程的影响,使得小变形矫直策略随矫直过程的深入,残余曲率并未向零点逐步收敛,而是在一定范围内波动;大变形矫直策略由于采用了逐步矫直的工艺设定思想,使其可以达到矫直的目的。这些分析结果为工业生产中矫直策略的选取提供了理论依据。
[Abstract]:The elastoplastic bending theory and the principle of linear superposition of stress are used to analyze the mechanical behavior of the continuous elastic-plastic bending process of plastic strengthened materials, and the effect of stress transfer effect on the straightening process is considered. The mechanical model of continuous elastic-plastic bending straightening process of seven-roll straightener is established. The average deviation between the two is less than 8% by comparing the experimental results and theoretical calculation values. The correctness of the theoretical analysis method is verified. Using this model, different straightening strategies are analyzed. The results show that the residual stress and curvature control ability of the large deformation straightening strategy is better than that of the small deformation straightening strategy. Due to the influence of stress transfer effect on the straightening process, the small deformation straightening strategy with the deepening of the straightening process, the residual curvature does not gradually converge to 00:00, but fluctuates in a certain range. The large deformation straightening strategy can achieve the purpose of straightening because of adopting the idea of step by step straightening technology. These results provide a theoretical basis for the selection of straightening strategy in industrial production.
【作者单位】：北京科技大学高效轧制国家工程研究中心;机科发展科技股份有限公司;
【基金】：中央高校基本科研业务费专项资金(FRF-IC-14-005) 北京市自然科学基金(3154035)资助项目
【分类号】：TG333.23
【正文快照】： 0前言*考虑到节能减排的需要,钢材逐渐向高强方向发展。高强钢板在生产过程中极易出现瓢曲或内应力不均,辊式矫直是改善钢板质量尤其是消除瓢曲和内应力的主要途径。实现矫直的基础是金属材料在较大弹塑性弯曲变形条件下,不论原始弯曲程度有多大差别,在弹复后所残留的弯曲差别

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