| 引用本文: | 张建邦,刘晓立,黄素霞,李河宗,崔衍亮,闫宾,闻海强.MS1180方管连续辊弯成形角部开裂机理[J].哈尔滨工业大学学报,2024,56(8):153.DOI:10.11918/202306029 |
| ZHANG Jianbang,LIU Xiaoli,HUANG Suxia,LI Hezong,CUI Yanliang,YAN Bin,WEN Haiqiang.Mechanism of corner cracking in continuous roll bending forming of MS1180 square pipe[J].Journal of Harbin Institute of Technology,2024,56(8):153.DOI:10.11918/202306029 |
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| MS1180方管连续辊弯成形角部开裂机理 |
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张建邦1,刘晓立1,2,黄素霞1,李河宗1,崔衍亮2,闫宾3,闻海强1
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(1.河北省智能工业装备技术重点实验室(河北工程大学),河北 邯郸 056038; 2.潍坊瑞孚冷弯设备有限公司,山东 潍坊 261057; 3.安阳工学院 机械工程学院,河南 安阳 455000)
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| 摘要: |
| 方矩形管在辊弯成形中会产生角部开裂现象,这已成为严重制约方矩形管质量的关键问题,为解决其角部开裂缺陷展开深入研究,寻找控制开裂缺陷的方法。首先通过对MS1180进行单轴拉伸、缺口拉伸和平面应变实验得到了材料的力学特性,并分别利用3种拉伸试验将Ayada、Rice-Tracey和标准化Cockroft-Latham准则进行校准,得到了预测误差最小的一种断裂准则,并以此构建了方矩管辊弯开裂模型。其次利用辊弯成形COPRA RF设计软件和有限元MARC仿真专业软件,结合生产实际条件建立了方矩形管连续辊弯成形三维有限元模型,并进行辊弯实验验证模型的准确性。最后采用扫描电镜和金相显微镜对方矩形管开裂件以及断口进行微观观察,针对性的利用有限元模型探究了方矩形管连续辊弯成形时应力-应变分布规律,并分析了道次数量、角部成形半径和机架间距对方矩管角部应力-应变分布的影响。结果表明:发现材料起裂点位于角部近外层,对开裂断口进行分析,得到其开裂方式为准解理开裂,角部剪切面上所受的主应力过大导致其开裂；增加辊弯道次数量、方矩形管角部成形半径以及机架之间的间距能有效减少开裂问题的出现,为以后解决方矩形管角部开裂问题提供了理论基础。 |
| 关键词: 辊弯成形 超高强钢 方矩形管 开裂 有限元分析 |
| DOI：10.11918/202306029 |
| 分类号:TG335.7 |
| 文献标识码:A |
| 基金项目:山东省科学技术厅基金(2022TSGC2510)；河北省教育厅基金(QN2021209) |
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| Mechanism of corner cracking in continuous roll bending forming of MS1180 square pipe |
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ZHANG Jianbang1,LIU Xiaoli1,2,HUANG Suxia1,LI Hezong1,CUI Yanliang2,YAN Bin3,WEN Haiqiang1
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(1.Key Laboratory of Intelligent Industrial Equipment Technology of Hebei Province (Hebei University of Engineering), Handan 056038, Hebei, China; 2.Weifang Ruifu Roll Forming Machinery, Weifang 261057, Shandong, China; 3.School of Mechanical Engineering, Anyang Institute of Technology, Anyang 455000, Henan, China)
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| Abstract: |
| Corner cracking phenomenon in square and rectangular pipes during roll bending, which has become a key issue that seriously restricts the quality of square rectangular tubes. In order to address this issue and find a way to control the cracking defect, a comprehensive study was conducted. Firstly, the mechanical properties of the MS1180 material were obtained by uniaxial tensile, notched tensile and plane strain experiments. Three fracture criteria, Ayada, Rice-Tracey and standardized Cockroft-Latham criteria, were calibrated using these test date, and the criterion with the smallest prediction error was selected. This criterion was then used to construct a square rectangular tube roll bending cracking model. Next, using COPRA RF design software and finite element MARC simulation professional software of roll bending, a three-dimensional finite element model for continuous roll bending of square rectangular tube was established in combination with the actual production conditions. The accuracy of the model was verified by roll bending experiments. Finally, scanning electron microscopy and metallographic microscope were used to observe the cracks and fractures of the rectangular tube. The stress-strain distribution of the square rectangular tube during continuous roll bending was investigated using the finite element model, and the effects pass number, corner forming radius and frame spacing on the stress-strain distribution of the corner of the rectangular tube were analyzed. It is found that the initiation of cracking point of the material occurs near the outer layer of the corner. In addition, the cracking fracture is analyzed, which reveals that the cracking mechanism is quasi-cleavage fracture, where excessive principal stress on the corner shear surface leads to cracking. Increasing the number of roll bending passes, the forming radius of the square rectangular pipe corner and the spacing between the frames can effectively reduce the occurrence of cracking issues. These findings provide a theoretical basis for solving the problem of cracking in the corners of square rectangular pipes in the future. |
| Key words: roll forming ultra-high tensile steel square rectangular tube cracking finite element analysis |
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