钢轨打磨接触线模型研究

Research on Contact Line Model for Rail Grinding

为了对钢轨打磨环境中砂轮磨粒与钢轨的接触线进行准确描述,基于磨削基本原理,本文提出一种接触线数学分析模型。首先根据砂轮与钢轨的几何接触关系获得接触线轨迹,然后与传统端面磨削接触线模型进行对比分析,最后对分析模型中主要影响因素对接触线长度的影响规律进行研究。结果表明:利用对本文模型中打磨车速度与打磨砂轮转速比的优化可以实现对打磨砂轮钝化速度的有效控制,从而可以使接触线长度最小来充分发挥砂轮磨粒的磨削性能,同时通过分析打磨砂轮半径与接触线长度的关系,也可以从理论上为杯形砂轮的内外径选择提供参考。

A novel mathematical analysis model of contact line was proposed on the principles of grinding and for the sake of nicety description of the contact line between the grinding material of the grinding wheel and the rail. Firstly, the trace of contact line was derived from the geometry relationship between the grinding wheel and rail. Then it was compared with the contact line model of traditional surface grinding. Finally, efforts were directed to work over the laws of key factors impacting the contact line lengths. Results come out as follows： The grinding wheel passivation speed can be controlled effectively by speed ratio＇s optimization, so that the grinding wheel can exert its cutting capability by minimizing the contact line length; at the same time, the re- lationship between the grinding wheel radius and contact line length holds the guidance for choosing the inner and outer sizes of grinding wheel.