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振动条件下螺纹面磨损对紧固件抗松能力影响

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成果类型:
期刊论文
论文标题(英文):
Effect of Thread Wear on Anti-Loosening Ability of Threaded Fastener under Vibration
作者:
张明远;鲁连涛;张远彬;张继旺;曾东方
作者机构:
[张明远; 鲁连涛; 张远彬; 张继旺; 曾东方] 西南交通大学, 牵引动力国家重点实验室, 四川, 成都, 610031
语种:
中文
关键词:
螺纹紧固件;磨损;松动;微粒子喷丸;数值计算
关键词(英文):
threaded fastener;wear;loosening;fine particle peening;numerical simulation
期刊:
西南交通大学学报
期刊(英文):
Journal of Southwest Jiaotong University
ISSN:
0258-2724
年:
2018
卷:
53
期:
3
页码:
596-601
基金类别:
国家高速铁路基础研究联合基金资助项目;国家重点实验室自主研究课题
机构署名:
本校为第一机构
摘要:
为改善振动条件下螺纹紧固件抵抗松动能力,在紧固件横向振动试验装置上,测试了微粒子喷丸未处理及处理镀锌紧固件的抗松动能力,使用扫描电镜观察测量了试验前、后螺纹面磨损形貌和尺寸,建立了考虑螺纹面磨损深度的紧固件刚度模型,利用该模型计算分析了磨损深度改变对预紧力的影响.结果表明:未喷丸紧固件预紧力耐久极限为2.8 kN,喷丸紧固件为2.0 kN,未喷丸紧固件抗松动能力低于喷丸紧固件,未喷丸紧固件螺纹面发生严重磨损,喷丸紧固件螺纹面磨损轻微;螺纹面磨损深度随着滑移距离的增加而增加,紧固件预紧力随着螺纹面磨损深度的增加先呈线性降低,随后降低速度逐渐加快.螺纹面磨损降低了紧固件抵抗松动的能力.
摘要(英文):
In order to improve the anti-loosening ability of threaded fasteners under vibration,the antiloosening abilities of the electro-zinc-plated fastener( EZP) and the electro-zinc-plated fastener treated by fine particle peening( FPP-EZP) were evaluated using a fastener transverse vibration apparatus.The surface damage and worn dimensions of the thread before and after testing were observed and measured using scanning electron microscopy. Then,a fastener stiffness model considering thread wear depth was used for numerical simulation of the effect of the wear depth on the threaded fastener preload. The test results show that the preload endurance limits of the EZP and FPP-EZP are respectively 2. 8 k N and 2. 0 k N,this suggests that the anti-loosening ability of the EZP is lower than that of the FPP-EZP. The observation results show severe damage on the thread surface for EZP,but no distinct damage on the FPP-EZP threads. The numerical simulation shows that the thread wear depth increases with the increase of the relative sliding distance between threads. Furthermore,the preload initially decreases nearly linearly with the increase in thread depth,and then rapidly. The thread wear can reduce the anti-loosening ability of threaded fasteners.

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