基于磨削力的磨削区表面温度场理论模型

Model of temperature field on ground surface based on grinding force

为研究磨削热产生的机理、改善加工质量,从磨削力的角度,分析磨削工件表面温度并进行纯理论建模。将磨削力分为切削变形力和摩擦力2部分,分别研究其同加工参数的关系。计算切削变形力和摩擦力的切向分力,并结合切向分力同热源强度的关系,建立磨削表面最高温度的理论模型。通过磨削45号钢并进行测温实验,确定模型中的常数,进而确定模型。研究发现:工件表面温度随切深、进给速度和砂轮转速增大而增大;表面温度模型的理论值与实验值之间的最大相对误差为5.04%,平均相对误差为2.47%。证明此方法可用于磨削表面温度场分析,进而改善加工表面质量。

To study the mechanism of grinding force and improve the machining quality,a theoretical model is established based on grinding force analysis after discussing the surface temperature of workpiece.The grinding force is divided into two parts,namely cutting force and friction force to study their relationship with processing parameters.The calculated tangential forces,combined with their relations with heat source intensity,are used to establish the theoretical model of highest temperature on ground surface.The constants are confirmed by grinding tests on 45 steel and thus confirming the model.Results show that the surface temperature increases with the increase of cutting depth,infeed speed and wheel speed,and that the maximum relative error between the surface temperatures of model and experiment is 5.04%,while average relative error is 2.47%.In conclusion,theoretical model based on grinding force could be used to analyze the temperature filed on ground surface and improve the surface quality.