摘要
为揭示槽型接触轮钢轨砂带高效打磨的材料去除机理,基于弹性赫兹接触理论,建立槽型接触轮与平型接触轮的材料去除比数学模型,掌握槽型接触轮砂带打磨周期应力变化规律,揭示打磨周期应力对打磨效率的影响机制,并基于钢轨砂带打磨专用试验平台,对比研究槽型接触轮与平型接触轮砂带打磨中的材料去除特性。结果表明:槽型接触轮打磨因其周期性的应力集中加压状态而具有较高材料去除效率;与平型接触轮相比,槽型接触轮打磨在较低压力下材料去除优势并不显著,随着打磨压力增加,槽型接触轮的材料去除效率明显提升,并在打磨压力为50 N时超越平型接触轮;在打磨表面粗糙度、振动、噪声及能耗等方面,槽型接触轮砂带打磨较平型接触轮均有明显优势,在75 N常用打磨压力下,前者较后者打磨材料去除率提高14%,表面粗糙度降低25%,振动减少17%,噪声降低4.5%,能耗降低12%。
To reveal the material removal mechanism of efficient rail grinding of grooved contact wheel by abrasive belts,a mathematical model for material removal ratio of grooved contact wheel and flat contact wheel based on Hertzian elastic contact theory was established to obtain the stress variation laws of grinding cycle of grooved contact wheel.Then,the influence mechanism of grinding cycle stress on grinding efficiency is revealed.Finally,based on the specialized experimental platform for rail abrasive belt grinding,the material removal characteristics in abrasive belt grinding of grooved contact wheel and flat contact wheel are compared and studied.The results show that the grooved contact wheel grinding has high material removal efficiency due to its cyclic stress concentration state.Compared to flat contact wheels,grooved contact wheel grinding is less advantageous for material removal at lower pressures.As the grinding pressure increases,the grooved contact wheel material removal efficiency increases significantly and surpasses that of flat contact wheels at a grinding pressure of 50 N.In terms of surface roughness,vibration,noise and energy consumption,the grooved contact wheel grinding has obvious advantages over the flat contact wheel.Under the commonly used grinding pressure of 75 N,the former achieves a 14% higher material removal rate,a 25% reduction in surface roughness,a 17% decrease in vibration,a 4.5% decrease in noise,and a 12% decrease in energy consumption compared to the later.
作者
李江
樊文刚
吴志伟
罗子峻
王俊达
LI Jiang;FAN Wengang;WU Zhiwei;LUO Zijun;WANG Junda(School of Mechanical and Electronic Control Engineering,Beijing Jiaotong University,Beijing 100044,China;Key Laboratory of Vehicle Advanced Manufacturing,Measuring and Control Technology,Beijing Jiaotong University,Ministry of Education,Beijing 100044,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2023年第4期75-83,共9页
China Railway Science
基金
中央高校基本科研业务费重点资助项目(2023JBZY020)
北京交通大学科技成果转化培育项目(M21ZZ200010)。
关键词
钢轨打磨
砂带
槽型接触轮
平型接触轮
材料去除
振动
能耗
Rail grinding
Abrasive belt
Grooved contact wheel
Flat contact wheel
Material removal
Vibration
Energy consumption
