铸造起重机主梁腹板裂纹分析与疲劳寿命研究  

Analysis and Fatigue Life Against the Webs Cracks of the Casting Crane

作　　者：谢英杰[1] 罗会信[1] 徐卫文[2] 章勤奋[2] 

机构地区：[1]武汉科技大学机械学院,湖北武汉430081 [2]武汉钢铁股份有限公司设备管理部,湖北武汉430083

出　　处：《机械设计与制造》2017年第4期108-110,共3页Machinery Design & Manufacture

摘　　要：针对某炼钢厂连铸车间铸造起重机主梁主腹板和横隔板的焊接部位出现的开裂现象,对主梁上盖板、腹板与隔板连接的主焊缝进行超声波无损探伤检测裂纹形态与分布情况,根据起重机实际工作条件和出现裂纹部位的受力状况,结合对危险部位的应力水平以动态应力的现场测试分析结构的力学性能和裂纹产生的原因,分析表明腹板产生裂纹部位抗疲劳强度不足。依据铸造起重机在一个工作循环下的应力信号,应用名义应立法结合Miner线性损伤累计理论计算铸测点部位的疲劳寿命,通过对危险部位疲劳寿命相对准确的估算,为设备的日常维护提供参考。The problem of cracking phenomenon is found in the welding parts of column web and transverse bulkheads of the casting crane.The characters and distributions of the cracks on the cover and web plate was detected by nondestructive technique, according to the situation by force and crack crane at actual operating conditions ,combining with the dynamic stress testing to analysis the reasons of the cracks combined.The analysis shows that the crack on the web plate refer to insufficient fatigue.Through the nominal stress method,calculating the fatigue life of casting crack crane parts with Miner theory, though a relatively accurate estimate of the crane fatigue life, it will provide a reference for the routine maintenance of the device.

关 键 词：铸造起重机 裂纹 Miner理论 疲劳寿命 

分 类 号：TH16[机械工程—机械制造及自动化]