摘要
钢轨打磨的本质为钢轨打磨磨石对钢轨表面的磨削加工,磨石的性能直接影响钢轨打磨作业的效率和质量。基于实际打磨砂轮磨料随机性和磨料体积分数,提出一种具有随机特性和高磨料体积分数的砂轮有限元建模方法。建立单颗磨料的热力耦合切削有限元模型和高磨料体积分数的整体砂轮抗压模型,考虑磨料尺寸、形状和分布的随机性,能更好模拟实际磨石的磨削过程和磨石组织结构。仿真模型分析了磨削过程中的材料去除机理、磨削温度、打磨后钢轨表面的残余应力以及整体磨石的抗压性能。同时开展钢轨打磨试验对仿真结果进行分析,该有限元模型可应用于钢轨打磨机理的研究和实际打磨砂轮的设计开发。
The essence of rail grinding is the material removal process of the rail surface by the grinding stones.The performance of the grinding stone directly affects the efficiency and quality of the rail grinding operation.Based on the randomness of actual grinding wheel and its abrasive volume,a finite element modeling(FEM)method with random characteristics and high abrasive volume fraction is established.FEM models are developed dependence on thermo-mechanical coupling method and the overall model of grinding wheel with high abrasive volume.These models can better simulate the actual grinding process and the structure of grinding wheels,which considered the randomness of abrasive size,shape,and distribution.The material removal mechanism and the grinding temperature during the grinding process,the residual stress on the rail surface after grinding and the compressive performance of the overall grinding stone were explored through the simulation.These methods can be applied to the research of rail grinding mechanisms and the development of grinding wheel.
作者
袁永杰
章武林
刘长宝
樊小强
朱旻昊
YUAN Yongjie;ZHANG Wulin;LIU Changbao;FAN Xiaoqiang;ZHU Minhao(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031;School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2023年第8期213-223,234,共12页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(51705435,52075458)。
