占空比及脉冲频率对镀镍层质量影响实验研究

Experimental Investigations on Effect of Pulse Duty Cycle and Frequency for Nickel Electroplating-Layer Quality

目前单层CBN砂轮成为超高速窄深槽加工的首选,针对目前电镀法制备CBN工具存在的镀层与基体结合强度差、镀层质量难以控制等的问题,对45#钢基体试件进行了电镀镍实验。运用脉冲电镀方法,制备了单金属镍层。研究了脉冲电源占空比对镀层孔隙率的影响及电源脉冲频率对镀层表层质量的影响,获得最优组合条件下的电镀镀层结构及形貌。实验结果表明:当脉冲电源占空比为20%、脉冲频率为0.5k Hz时,获得的镀层具有较低的孔隙率、晶粒细致的结构及形貌。

Currently the monolayer electroplated CBN pattern grinding wheel has became the first choice for ultra high speed and narrow-deep-groove machining. In order to overcome the defect of poor adhesion between plating-layer and substrate and uncontrollable of platinglayer quality in manufacturing CBN tools using electroplating method, nickel electroplating experiments on 45 carbon steel matrix were made. Single metal nickel layer has been prepared by pulse plating method. The relationships between pulse duty cycle arM plating-layer porosity, pulse frequeucy and plating-layer surface quality had been stndied in it, and then the structure and surface profile of plating-layer under the optimal combination conditions had been realized. Experiment results show that the structure and plating-layer surface profile with low porosity and smaller grain size were achieved at 20% duty cycle and 0.5kHz frequency.