砂轮表面磨粒出露高度对轴承钢磨削振动的影响

为探究砂轮表面磨粒形态对磨削振动的影响规律，提高磨削加工质量，构建了磨削振动模型并推导磨粒形态-接触刚性-磨削振动的对应关系，开展修整-磨削试验，通过试验分析并验证不同磨粒形态对磨削振动信号RMS和工件表面波纹特征W_a影响的差异。结果表明:在不影响砂轮锋利性的前提下，表征磨粒出露高度的砂轮AH值减小约58%，则RMS值和W_a值分别减小约47%和57%；在相同磨粒出露高度条件下，磨粒钝化的比例约20%，则RMS和W_a分别减小约22%和30%；同时，适度减小磨粒出露高度，磨粒适度钝化，有助于增大磨粒与工件接触面积，改善磨削振动，提高磨削加工质量。且提出的磨削振动模型与试验结果相符。 

Effect of abrasive particle exposure height on grinding vibration of bearing steel

In order to explore the influence of grinding wheel surface abrasive state on grinding vibration and improve grinding quality, a grinding vibration model was constructed and the corresponding relationship between grinding particle state, contact rigidity and grinding vibration was deduced. Dressing-grinding experiments were carried out to analyze and verify the effects of different abrasive states on the vibration signal RMS and the surface corrugation characteristics W_a.The results show that without affecting the sharpness of the grinding wheel, the AH value of the grinding wheel representing the exposure height of abrasive particles decreases by about 58%, while the RMS value and W_a value decrease by about 47% and 57%, respectively.At the same abrasive exposure height, the ratio of abrasives passivation is about 20%, while RMS and W_a are reduced by about 22% and 30%, respectively. Meanwhile, the appropriate reduction of the abrasive exposure height and the appropriate passivation of the abrasive are helpful to increase the contact area between the abrasive and the workpiece, improve the grinding vibration and improve the grinding quality. The proposed grinding vibration model is in agreement with the experimental results.