基于虚拟砂轮的钢轨打磨温度场研究
黄琅茗,周坤,丁昊昊,郭俊,刘启跃,王文健
(西南交通大学 摩擦学研究所,四川 成都 610031)
摘要:基于现场钢轨打磨作业方式,建立符合真实砂轮特征的虚拟砂轮,进而建立钢轨打磨过程中砂轮-钢轨模型。运用有限元软件DEFORM仿真打磨过程中的钢轨温度场变化,分析钢轨上节点温度的变化规律,并研究不同打磨参数(包括打磨深度、进给速度、砂轮转速)对打磨温度的影响。研究结果表明:钢轨打磨过程中,钢轨经历砂轮的两次打磨作用,磨削区域温度继续升高,热影响区会进一步扩大。钢轨节点温度迅速升高过程中会经历一个小幅降低,然后继续升高达到温度最高点之后再逐渐降低。打磨参数对打磨温度有明显影响,当打磨深度从10 μm增加到70 μm时,钢轨最高温度从330℃升高至529℃;当进给速度从5 km/h增加至20 km/h时,钢轨最高温度从663℃降低至407℃;当砂轮转速从2000 r/min增加至3800 r/min时,钢轨最高温度从353℃升高至445℃。
关键词:钢轨打磨;虚拟砂轮;打磨参数;打磨温度
中图分类号:U213.4 文献标志码:A doi:10.3969/j.issn.1006-0316.2020.07.001
文章编号:1006-0316 (2020) 07-0001-06
Temperature Field of Rail Grinding Based on a Virtual Grinding Wheel
HUANG Langming,ZHOU Kun,DING Haohao,GUO Jun,LIU Qiyue,WANG Wenjian
( Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China )
Abstract:Based on the rail grinding process in the field, a virtual grinding wheel model was built according to the field grinding wheels, and a wheel-rail model during rail grinding was established. The finite element software DEFORM was used to study the evolution of temperature field on the rail during rail grinding, and temperature change of a node on the rail surface was analyzed. Meanwhile, the influence of grinding parameters (such as the grinding depth, the feed speed of a grinding train, and the rotational speed of a grinding wheel) on grinding temperature was studied. The results showed that during rail grinding, the rail was ground twice by the grinding wheel. The temperature of ground area continued to rise, and heat affected zone  expanded. The node temperature experienced a small decrease in the process of rapid increase, then increased to the maximum value, and then decreased slowly. Grinding parameters had influence on the grinding temperature. With the grinding depth increasing from 10 μm to 70 μm, the maximum temperature on the rail surface increased from 330℃ to 529℃. With the feed speed increasing from 5 km/h to 20 km/h, the maximum temperature on the rail surface declined from 663℃ to 407℃. With the rotational speed increasing from 2000 r/min to 3800 r/min, the maximum temperature on the rail surface increased from 353℃ to 445℃.
Key words:rail grinding;virtual grinding wheel;grinding parameters;grinding temperature
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收稿日期:2020-01-14
基金项目:国家自然科学基金项目(51575460);四川省高校科研创新团队项目(18TD0005)
作者简介:黄琅茗(1994-),男,四川广安人,硕士研究生,主要研究方向为钢轨打磨行为仿真研究,E-mail:huanglangming@foxmail.com;刘启跃(1964-),男,四川成都人,博士,教授,主要研究方向为轮轨系统服役行为及材料摩擦磨损。
 

 

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