顶管机用盘形滚刀断裂原因分析  

Fracture Analysis of Disc Cutter of Pipe Jacking Machine

作　　者：贾爽 马允郑 吕庆洲 陈胜[1] 康学勤[1] JIA Shuang;MA Yun-zheng;LV Qing-zhou;CHEN Sheng;KANG Xue-qin(School of Materials and Physics,China University of Mining and Technology,Jiangsu Xuzhou 221116,China;Anhui Tangxing Equipment Technology Co.,Ltd.,Anhui Huainan 232000,China)

机构地区：[1]中国矿业大学材料与物理学院,江苏徐州221116 [2]安徽唐兴装备科技股份有限公司,安徽淮南232000

出　　处：《失效分析与预防》2024年第4期279-283,共5页Failure Analysis and Prevention

基　　金：安徽省重点领域补短板产品和关键技术攻关任务揭榜项目(JB20099);中国矿业大学创新训练项目(20200332cx)。

摘　　要：顶管机盘形滚刀在施工过程中出现断裂,严重影响施工效率且增加施工成本。对断裂和偏磨的盘形滚刀进行统计和分析,发现其断裂位置、形式有相似性,对滚刀质量的提高具有重要意义。对故障件进行外观观察、成分测试、硬度分布测试及金相组织测试,结果表明:盘形滚刀密封性较差,在施工过程中有砂石和泥浆进入滚刀内部,造成内部轴承失效,导致盘形滚刀不能自转且出现偏磨,滚柱相互挤压产生外推力,导致轴承外圈和刀圈均出现断裂,最终导致盘形滚刀断裂。建议改善盘形滚刀密封性,防止影响轴承运转的外部异物进入轴承,可有效避免滚刀早期失效。The disc cutter of a pipe jacking machine fractured in the process of construction,which seriously affected the construction efficiency and increased the construction cost.Statistical analysis was conducted on the fractured and partially-worn disc cutters,it was found that their fracture positions and patterns were similar,which is of great significance for the quality improvement of disc cutters.Macroscopic observation,composition testing,hardness testing and metallographic structure analysis were carried out on the fractured disc cutter.The results show that because of the poor sealing of the disc cutter,sand and mud entered the inside of the disc cutter in the construction process,causing the failure of internal bearings.As a result,the disc cutter could not rotate by itself,leading to partial wear.The rollers squeezed each other,causing outward thrust,which resulted in the fracture of the bearing outer ring and the cutter ring,eventually causing the fracture of the disc cutter.It is suggested that the sealing of the disc cutters should be improved to prevent the external foreign matter that may affect the bearing operation from entering the bearing and effectively avoid the early failure of the cutters.

关 键 词：盘形滚刀 5Cr5MoSiV1 密封 顶管机 偏磨 

分 类 号：TG711[金属学及工艺—刀具与模具]