G95Cr18不锈钢关节轴承外圈断裂原因  

Fracture Reason of G95Cr18 Stainless Steel Joint Bearing Outer Ring

作　　者：宋体杰 于妍妍 刘春秘 宋雪 康凯[1] 王琳[2] 孙梦梦 SONG Tijie;YU Yanyan;LIU Chunmi;SONG Xue;KANG Kai;WANG Lin;SUN Mengmeng(Shenyang Aircraft Industrial Group Co.,Ltd.,Shenyang 110850,China;School of Mechanical Engineering,Inner Mongolia University of Technology,Hohhot 110850,China)

机构地区：[1]沈阳飞机工业(集团)有限公司,沈阳110850 [2]内蒙古工业大学机械工程学院,呼和浩特010051

出　　处：《机械工程材料》2025年第1期112-119,共8页Materials For Mechanical Engineering

摘　　要：某以过盈配合方式置于连杆安装孔内的关节轴承外圈发生断裂。结合轴承结构和材料属性,通过现场调查、断口宏微观形貌观察、显微组织分析、硬度测试以及有限元模拟等方法,分析了该外圈断裂模式及原因。结果表明:关节轴承外圈断裂模式为一次性过载断裂;在外加载荷作用下,轴承外圈安装缺口处产生裂纹,同时存在硬度偏低现象,缺口边缘局部材料发生脱落进入轴承摩擦副,引起磨粒磨损和摆动卡滞,摆动卡滞的发生使得外圈逐渐脱出安装孔,导致一次过载断裂倾向增大,最终造成外圈断裂。A joint bearing outer ring placed in the connecting rod mounting hole by interference fit broke.Combined with bearing structure and material properties,the fracture mode and cause of the outer ring were analyzed by field investigation,fracture macro and micro morphology observation,microstructure analysis,hardness test and finite element simulation.The results show that the fracture mode of the joint bearing outer ring was one time overload fracture.Cracks occurred at the mounting notch of the bearing outer ring under the action of applied load.At the same time,due to the low hardness,local materials on the edge notch fell off into the bearing friction pair,causing abrasive wear and swing stuck,and the occurrence of swing stuck made the outer ring gradually slipped out of the mounting hole,as a result,the tendency of one time overload fracture increased and the outer ring fracture was eventually caused.

关 键 词：关节轴承 外圈断裂 失效分析 有限元模拟 

分 类 号：TB302[一般工业技术—材料科学与工程]