镍包覆率对固结金刚石磨料研磨垫加工性能的影响
Influence of Ni covering ratio of diamond on machining performance of fixed abrasive pad
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摘要: 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。Abstract: Diamond abrasives were coated by electroless plating. Fixed abrasive pads(FAP) were prepared by using diamonds with different Ni covering ratio. The morphology of coated diamond abrasives were observed by scanning electron microscopy. The effect of Ni covering ratio on coefficient of friction(COF) and acoustic emission(AE) during the lapping process were investigated. Material removal rate(MMR) and surface roughness of K9 glass lapped by FAP with abrasives with different Ni covering ratio were compared. The results demonstrate that morphology of abrasives changes significantly with Ni covering ratio. COF, MMR and surface roughness increase first then decrease with the increase of covering ratio. Friction force between pad and work-piece, and cutting depth of abrasive grain into the work-piece are the highest when Ni covering ratio is 50% and the FAP exhibits a characteristic of self-conditioning. The MRR and its stability are the best when FAP embedded with diamond abrasives with a Ni covering ratio of 50%.
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