电源输出形式对电镀金刚石切割线上砂形貌的影响

Effect of power output on morphology of electroplating diamond wire

为研究上砂电源的输出形式对金刚石切割线上砂形貌的影响,使用直径为0.18mm镀铜高碳钢线为基线,和粒度尺寸为30~40μm（表面化学镀镍磷合金、增重30%）的金刚石颗粒进行电镀试验。上砂电源的输出形式分别为直流输出、单脉冲输出和双脉冲输出。单脉冲输出时,随着占空比从0.8降到0.2,金刚石颗粒在切割线上的团聚现象逐渐减少,占空比为0.6时上砂效果最佳。双脉冲输出时,随着正向脉冲的开通比从8降到2,金刚石颗粒的团聚现象也逐渐降低,开通比为6时最佳,此时基本没有团聚现象,金刚石分布较均匀。理论分析表明：双脉冲输出的负脉冲对团聚的金刚石有脱附作用,因此能有效抑制团聚现象,同时过于强烈的脱附作用也会降低上砂量。

The effect of power output form on the morphology of diamond wire is studied. In the experiment, Ф0.18 mm copper plating high carbon steel wire is used as the baseline, while the size of diamond particle is 30-40 μm, surface of which has been chemically plated with nickel phosphorus alloy at weight increase of 30%. The output forms of the power are DC output, single pulse output and double pulse output. The aggregation of diamond particles on the wire is reduced gradually when the duty ratio reduces from 0.8 to 0.2, while the optimum duty ratio is 0.6. The aggregation phenomenon of diamond particles is gradually reduced when the opening ratio of the positive pulse of double pulse output reduces from 8 to 2, while the optimum opening ratio is 6 and diamond particles are well distributed. Theoretical analysis shows that the negative pulse of the double pulse output has desorption effect on the agglomeration diamond, so it can effectively restrain the agglomeration phenomenon. At the same time, too strong desorption effect will reduce the amount of sand.