钢丝缠绕重型模锻液压机坎合结构的疲劳和寿命预测  

Fatigue Life Prediction of the Bumpy Ridge Joining of the Heavy Die Forging Press with Steel Wire Wound

作　　者：何文斌[1,2] 曾攀[1] 林峰[1] 颜永年[1] 张磊[1] 

机构地区：[1]清华大学机械工程系,北京100084 [2]郑州轻工业学院机电学院,郑州450002

出　　处：《机械工程学报》2015年第8期29-36,共8页Journal of Mechanical Engineering

基　　金：国家高技术研究发展计划(863计划;2012AA040202);国家科技支撑计划(2007BAF05B02)资助项目

摘　　要：剖分坎合是钢丝缠绕液压机的关键技术,坎合副的抗剪性及其抗疲劳性对模锻液压机使役期间保持机架完整性至关重要。坎合原理及抗疲劳性方面研究工作的不足限制了该技术的推广和应用。设计坎合疲劳试验夹具,对液压机本体小试样坎合结构进行切向等幅循环载荷疲劳试验。分析坎合结构切向循环载荷条件下三个阶段的载荷-位移循环特性;建立坎合结构疲劳指数模型,当载荷比R=0.1时,坎合结构疲劳量纲一载荷极限为tmax*F=0.74;研究量纲一切向载荷幅值与均值a m-**F F关系,得到坎合结构疲劳等寿命曲线;提出基于Miner线性累积损伤理论的坎合结构疲劳累积损伤准则。实现了钢丝缠绕模锻液压机坎合结构的安全性评估和寿命预测。The bumpy ridge joining is the key technology of the heavy die forging press with steel wire wound. The shear resistance and the fatigue resistance of the bumpy ridge palr are vital to the integrity of the frame during service. The use of the technology is limited due to the deficient research on the principle of the bumpy ridge joining and the fatigue resistance of the structure. A set of clamp was developed to test the structural fatigue of the bumpy ridge joining, by which groups of fatigue tests of constant amplitude cycle tangential loading were performed.The cycle characteristic of the load-displacement of the bumpy ridge joining under the cycling tangential load is studied and the exponential model of the structural fatigue is established, the dimensionless fatigue load limit tmax＊F is 0.74 when the load ratio R is 0.1. The relation between dimensionless amplitude value and mean value of the tangential load （ a mF＊-F＊） is studied to get the fatigue constant life curve, as well as a criterion of bumpy ridge structural damage accumulation is established based on Miner＇s theory. The safety evaluation and fatigue life prediction are implemented for the bumpy ridge structures of the heavy die forging press with steel wire wound.

关 键 词：钢丝缠绕 模锻液压机 坎合 疲劳 寿命预测 

分 类 号：TG315[金属学及工艺—金属压力加工]