大钟吊杆疲劳断裂原因的有限元分析.pdf

大钟吊杆疲劳断裂原因的有限元分析 * 大钟吊杆疲劳断裂原因的有限元分析 潘紫微 1 吴海彤 2 包家汉 1 （1. 安徽工业大学机械工程学院，马鞍山 243002 ；2. 马钢机动部，马鞍山 243002 ） 摘 要 根据大钟吊杆的可能失效原因，采用有限元方法，建立高炉大钟吊杆系统的接触分析模型。通过改变有限 元模型中大钟与大钟料斗间隙量以及销轴铰接处的摩擦因数，模拟大钟吊杆实际工作状况，针对间隙量较大，计算 不易收敛的工况，采用强制位移约束的方式加载。计算结果表明，随着大钟与间隙量以及摩擦因数的增加，大钟吊 杆断裂截面的应力显著增大，是造成大钟吊杆疲劳断裂的主要原因之一。 关键词 高炉 大钟 有限元法 疲劳断裂 The Finite Element Analysis of Fatigue Fracture for Hanging Rod Linking Big Bell Pan Ziwei1 Wu Haitong 2 Bao Jiahan1 (1.School of Mechanical Engineering, Anhui University of Technology, Ma’anshan ，243002; 2. Machinery and Power Section, Masteel, Ma’anshan ，243002) Abstract A contact analytical modal of hanging rod linking big bell in blast furnace was built in finite element method (FEM) according to fatigue reasons of hanging rod linking big bell. Simulate the reality working condition of the hanging rod through alternations of clearance between big bell and receiving cone and friction coefficient around hinged pin. The forced displacement constraint was applied in non-convergence work condition which the clearance between big bell and receiving cone were large. The results of computation demonstrate that the stress at the fracture section of hanging rod linking big bell is increase markedly with the clearance and friction coefficient, which is one of the main reasons causing the fatigue fracture of hanging rod linking big bell. Key words blast furnace, big bell, FEM, fatigue fracture 1 引言 高炉大钟吊杆是炉顶设备的关键零件，承担着频繁的进、加料的操作。由于长期承受交变载荷, 并处于 高温、腐蚀性的介质中，容易导致其安全可靠性下降, 引起生产事故，