【摘要】 YAG晶体具有高脆性和高硬度的特点，加工过程中容易产生边缘崩碎，严重影响晶体元件的使用精度和寿命。基于划痕断裂力学模型建立了考虑应变率效应的YAG晶体自旋转磨削过程工件崩边尺寸理论模型，并开展YAG晶体自旋转磨削实验对理论模型的可靠性进行了验证，同时分析了磨削工艺参数对崩边尺寸的影响规律。结果表明：理论模型预测结果与实验结果相近，模型可靠；随着砂轮转速的增加，崩边尺寸逐渐减小；随着工件转速和进给速度的增加，崩边尺寸逐渐增大。更多还原

【Abstract】 Edge-chipping is easy to be generated during the machining process of YAG crystals due to the high brittleness and hardness, which seriously affects the service accuracy and life of the crystal components.Based on the model of scratch fracture mechanics, the theoretical model of edge-chipping size during self-rotating grinding process of YAG crystals is established by considering the strain rate effect.In addition, self-rotating grinding experiment of YAG crystals is performed to verify the accuracy of the theoretical model.The results show that the predicted results of the theoretical model are close to the experimental results, which indicated that the model is reliable.The influence of grinding process parameters on the edge-chipping size is analyzed, which indicated that the edge-chipping size decreases as the wheel rotational speed increases, and it increases as the workpiece rotational speed and feed speed increases.更多还原