钎焊金刚石砂轮端面磨削钢轨中磨粒的单位磨削力研究

Study on unit grinding force of abrasive grains in face grinding rail with brazed diamond grinding wheel

假设钎焊金刚石砂轮磨粒形状为八面体且磨粒分布均匀,用磨粒运动学轨迹模型及有限元积分法推导端面磨削时磨粒与工件的接触线长度,用平均体积法求得未变形磨屑平均厚度,进而推出端面磨削时切向磨削力与单位磨削力的关系式,并通过钢轨端面磨削实验建立单位磨削力数学模型并进行验证。验证结果表明:单位磨削力数学预测模型有效,可为后续端面磨削时磨削力和磨削温度等的计算提供理论支撑。

Assuming that the grit shape of brazed diamond grinding wheel is octahedron and that the grits are uniformity distributed, the contact line length between the grit and the workpiece is deduced by using the kinematic trajectory model of the grit and the finite integral method. The average thickness of the un-deformed abrasive chip is calculated by the average volume method, and then the relationship between the tangential grinding force and the unit grinding force in face grinding is deduced. The mathematical model of unit grinding force is established and verified through the rail end grinding experiment.The results show that the mathematical prediction model of unit grinding force is effective and can provide theoretical support for calculating the grinding force and temperature in subsequent end grinding.