管模间隙对21-6-9高强不锈钢管数控绕弯成形质量的影响

发布时间：2018-01-26 11:03

本文关键词： 数控绕弯间隙壁厚变化截面畸变有限元模拟　出处：《北京理工大学学报》2015年09期 　论文类型：期刊论文

【摘要】：基于ABAQUS/Explicit有限元平台,建立了21-6-9高强不锈钢管数控绕弯成形过程的三维弹塑性有限元模型,并验证了模型的可靠性.利用该模型研究了不同管模间隙对管材数控绕弯过程壁厚变化及截面畸变的影响规律.结果表明:增加管材-芯棒间隙、管材-防皱块间隙或减小管材-压块间隙、管材-弯曲模间隙可以减小壁厚减薄率;减小管材-芯棒间隙或增加管材-压块间隙可以减小壁厚增厚率,而其他管模间隙对壁厚增厚率的影响不显著;减小管材-压块间隙、管材-弯曲模间隙或增加管材-防皱块间隙可以减小截面畸变率,而增加管材-芯棒间隙,截面畸变率呈现先减小后增加的变化规律;获得了规格为Φ15.88mm×t0.84mm×R47.64mm的21-6-9高强不锈钢弯管件较佳的管模间隙值.
[Abstract]:Based on the ABAQUS/Explicit finite element platform, a three-dimensional elastic-plastic finite element model of 21-6-9 high strength stainless steel tube is established. And the reliability of the model is verified. The influence of different pipe die clearance on the wall thickness change and section distortion during numerical control bending of pipe is studied. The results show that the tube-mandrel gap is increased. The gap between pipe and crinkle block or the gap between pipe and press block can be reduced, and the gap between pipe and bending die can reduce the thinning rate of wall thickness. Decrease of tube-mandrel clearance or increase of tube-block gap can reduce wall thickness thickening rate, while other die clearance has no significant effect on wall thickness increase rate. Reducing the gap between pipe and block, the gap between pipe and bending die or increasing the gap between pipe and wrinkle block can reduce the section distortion rate, but increase the gap between pipe and mandrel, the section distortion rate decreases first and then increases. The better clearance value of pipe die for 21-6-9 high strength stainless steel bending pipe with 桅 15.88mm 脳 t0.84mm 脳 R47.64mm was obtained.
【作者单位】：南京航空航天大学材料科学与技术学院;南昌航空大学航空制造工程学院;
【基金】：国家自然科学基金资助项目(51164030)
【分类号】：TG306;TG142.71
【正文快照】： 21-6-9高强不锈钢管具有高的强度、优良的耐腐蚀和耐高压性以及良好的抗高温氧化性,广泛应用于航空、航天、汽车等领域的燃油、液压、环控及冷气等系统管路.管材数控绕弯成形技术由于能够满足对产品轻量化、强韧化的需求,而且具有高精度、高效率、低消耗、数字化和智能化的特

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