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通过化学镀镍的方法,在金刚石磨粒表面包覆一层Ni-P合金层;采用不同包覆率的金刚石磨料制备固结磨料研磨垫;通过SEM观察分析金刚石的微观形貌;研究了磨料包覆率对研磨垫加工K9玻璃过程中的摩擦系数和声发射信号的影响;采用马拉松式试验方法,比较了不同包覆率磨料的研磨垫加工K9的材料去除速率及研磨后工件的表面粗糙度。结果表明:化学镀镍可以显著改变磨料的表面形貌;研磨过程中的摩擦系数、材料去除速率和工件表面粗糙度均随着包覆率的提高呈现出先增大后减小的趋势;包覆率50%时的金刚石磨料对工件的摩擦力和切入深度最大,研磨垫的磨粒保持与自修整性平衡,加工效率及其稳定性最高。
The Ni-P alloy layer was coated on the surface of diamond abrasive by electroless nickel plating. The abrasive grinding pad was prepared by using diamond abrasive with different coverage rate. The microstructure of diamond was observed and analyzed by SEM. The effect of coating rate on the friction coefficient and acoustic emission signal in the process of polishing K9 glass was studied. The marathon test method was used to compare the material removal rate of K9 with different coating rate and the surface roughness degree. The results show that the electroless nickel plating can significantly change the surface morphology of the abrasive. The friction coefficient, the material removal rate and the surface roughness of the abrasive increase with the increase of the coating rate at first and then decrease. When the rate of 50% of diamond abrasive friction and cutting depth of the workpiece the largest abrasive pad to maintain the balance of self-dressing and processing efficiency and stability of the highest.