摘要
为了解决某发动机燃气导管安装边螺栓开裂失效问题,本文从螺栓宏、微观形貌、断口、材质、装配等角度,对螺栓荧光显示不合格原因进行分析。结果表明,螺栓金相组织和硬度符合要求。燃气导管安装边螺栓荧光显示存在两类缺陷,一类为折叠缺陷[1],另一类为裂纹缺陷[2]。折叠缺陷产生于螺纹滚制过程中,为典型的零件原始制造缺陷。裂纹缺陷呈多源特点,与折叠缺陷有关,多次拆装诱发了裂纹。所有的裂纹在试车过程中未出现疲劳扩展[3]。建议优化螺栓螺纹滚压成型[4~5]工艺,可有效降低螺栓折叠的产生;发动机燃气导管发生拆装时该螺栓作为翻修必换新件处置。该故障未再发生,螺栓失效问题得到了有效解决。
In order to solve the problem of cracking and failure of bolts on the installation side of gas ducts of an engine,this paper analyzes the reasons for the unqualified fluorescence display of bolts from the perspectives of bolt macro,microscopic morphology,fracture,material and assembly.The results show that the metallographic structure and hardness of the bolt meet the requirements.There are two types of defects in the fluorescence of the bolts on the side of the gas pipeline,one is the fold[1]defect and the other is the crack[2]defect.Folding defects arise during thread rolling and are typical part original manufacturing defects.The crack defect is multi-sourced,which is related to the folding defect,and the crack is induced by repeated disassembly and assembly.All cracks did not develop fatigue[3]during commissioning.It is recommended to optimize the bolt thread rolling forming process[4-5],which can effectively reduce the occurrence of bolt folding.When the engine gas pipe is disassembled,the bolt is disposed of as a new part for rehabilitation.The failure did not recur and the bolt failure problem was effectively resolved.
作者
李继宏
邹伟
张国军
刘丽玉
全琼蕊
LI Jihong;ZOU Wei;ZHANG Guojun;LIU Liyu;QUAN Qiongrui(Metrology and Test Center of AECC Aero Science and Technology Co.,Ltd.,Chengdu 610503,Sichuan China;Luzhou Hanfei Aerospace Science and Technology Development Co.,Ltd.,Luzhou 646601,Sichuan China;Beijing Aeronautical Materials Research Institute of Air China,Beijing 100095,China)
出处
《中国铸造装备与技术》
CAS
2024年第5期52-61,共10页
China Foundry Machinery & Technology
