摘要
基于砂轮打磨钢轨的原理建立磨粒与钢轨接触的几何模型和受力模型,分析磨粒切削深度与打磨设定功率即钢轨打磨车电机输出功率的理论关系;依据磨粒分布及其突出高度的统计规律和磨粒切削深度与参与切削磨粒数目及电机输出功率的关系,仿真研究被测区域的钢轨打磨效果,并与试验结果进行对比。结果表明:切削深度的增加会引起参与切削磨粒数目的增加,而参与切削磨粒数目的增加亦会增加测试区域中打磨区域的重叠;受钢轨本身廓形曲率变化的影响,在电机输出功率相同而砂轮摆角不同时,钢轨的打磨结果也不相同;砂轮在钢轨轨顶部位的打磨会形成最宽的打磨带以及最大的打磨横断面面积,而轨肩部位的打磨带则较窄且打磨横断面面积较小;仿真与试验结果吻合,说明基于磨粒模型预测打磨砂轮的实际打磨性能是可行的。
A novel model is built and validated by tests to find the relationship between the setting power of the grinding motor and the grinding results based on the micro-mechanism of grinding grain at this original study of rail grinding mechanism.With considering the rail grinding operation characteristics,the theoretical relationship is connected between the grains cutting speeds and the consumed power.The numbers of grains involved into the cutting process,their cutting depths and also the consumed power can be calculated based on the understanding of grains distribution and heights.Furthermore,the grinding simulation for the whole grinding stone can be finished with many effective cutting grains.The average cutting depth for defined zone can be measured from the ground surface.Eventually,the validating experiments are implemented on the rail grinding test rig.The comparison results show a series of great agreements between the measured data of experiments and the simulation results both on the single-stone grinding model and also the multi-angles grinding：the increasing of grinding depth will bring more grains involved into the cutting;and the increasing grain numbers causes more overlaps on the grinding area;the same setting power will have different grinding results when the tilting angles of the grinding wheels for the influence of rail profile curvature;the grinding on the rail head will have the largest grinding facet and cross-sectional area,while the grinding on the rail corner will have the less ones.Such agreement in this innovative research reveals the theoretical feasibility by simulating the rail grinding process with cutting grains.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2015年第1期33-39,共7页
China Railway Science
基金
铁道部科技研究开发计划项目(20100G008-C)
北京交通大学博士点基金资助项目(M13C100010
M12C100010)
北京交通大学基本科研项目(M14JB00040)
北京交通大学校科研基金资助项目(M11JB00350)
关键词
钢轨打磨
打磨砂轮
磨粒
切削力
切削深度
打磨性能
Rail grinding
Grinding wheel
Abrasive grain
Cutting force
Cutting depth
Grinding performance
