不同晶粒度硬质合金的磨削力预测(英文)

Grinding Force Prediction for Tungsten Carbides with Various Grain Sizes

介绍了磨削力数学模型研究现状,在断裂力学基础上建立了与工艺参数和材料物理机械性能相关的磨削力数学模型,可根据数学模型预报不同晶粒度硬质合金的磨削力.为了论证此磨削力数学模型,对不同晶粒度的硬质合金进行了磨削实验.分析了晶粒度和工艺参数对磨削力、磨削表面形貌的影响,讨论了硬质合金物理机械性能对磨削力的影响.实验研究结果表明,数学模型预估值与实验数据吻合程度高,晶粒度对磨削力和磨削表面形貌都有显著影响.在相同磨削条件下,减少硬质合金晶粒度则磨削力减少,并且磨削表面质量改善,反之亦然.细磨粒砂轮磨削时晶粒度对磨削力的影响程度减弱.

After the existing grinding force models are reviewed, a grinding force mathematical model, which relates to workpiece material properties and grinding conditions, was established based on fracture mechanics. Based on the model, grinding force of tungsten carbide （WC） materials with various grain sizes can be predicted. To verify the model, an experimental study on the WC materials was performed. The influences of the grain size of the WC materials and process parameters in grinding on grinding forces and ground surface topography were analyzed. Then, the relationship between grinding force and mechanical properties of the WC materials were discussed. The model prediction shows a good agreement with the experimental results. The grain size of the WC materials has an obvious effect on grinding force and ground surface topography. Under the same grinding conditions, a better surface finish and reduced grinding force are obtained on the WC workpiece with a smaller grain size, and vice versa. This phenomenon becomes less obvious when a grinding wheel with a small grit size is used.