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| 热反挤压过程中金属不稳定流动状态的研究 | |
| 引用本文： | 郭向杨,王鹏程,张士宏,阚盈,高建军.热反挤压过程中金属不稳定流动状态的研究[J].锻压技术,2012,37(3):62-66. |
| 作者姓名： | 郭向杨 王鹏程 张士宏 阚盈 高建军 |
| 作者单位： | 1. 内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特,010051 2. 中国科学院金属研究所,辽宁沈阳,110016 3. 包头北方创业股份有限公司,内蒙古包头,014010 |
| 摘 要： | 利用有限元软件Deform-3D对厚壁钢管热反挤压制坯过程进行数值模拟,分析了摩擦系数和壁厚对金属流动状态的影响.结果表明:反挤压件管壁内侧的金属在向上平移的同时还伴有径向移动,摩擦系数越大、管壁越厚,径向移动的程度越大,越容易造成凸模抱模的现象.根据模拟结果,提出了一种新增径向塑性变形区的大型厚壁钢管热反挤制坯的变形... |
| 关 键 词： | 数值模拟 反挤压 摩擦 壁厚 抱模 |
Research on unstable flow state of metal in hot backward extrusion |
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| GUO Xiang-yang , WANG Peng-cheng , ZHANG Shi-hong , KAN Ying , GAO Jian-jun.Research on unstable flow state of metal in hot backward extrusion[J].Forging & Stamping Technology,2012,37(3):62-66. | |
| Authors: | GUO Xiang-yang WANG Peng-cheng ZHANG Shi-hong KAN Ying GAO Jian-jun |
| Affiliation: | 1.School of Materials and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China; 2.Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China; 3.Baotou Northern Business Co.,Ltd.,Baotou 014010,China) |
| Abstract: | Numerical simulation was made on hot backward extrusion of large steel tube with thick wall and the influence of friction coefficient and wall thickness on flow state of metal was analyzed.The result shows that when the inner part of the cylindrical metal shifts upwards,it also flows along the radial direction.The larger the friction coefficient and the wall thickness,the more metal flows horizontally,and the punch is more likely to be sticked.According to the simulation,a new forming area partition method was proposed about the large thick wall tube on hot backward extrusion,which adds radial plastic deformation area on existing forming area partition method of backward extrusion.Research proves that this method is in accordance with metal flow condition well. |
| Keywords: | numerical simulation backward extrusion friction wall thickness sticking-to-die |
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