关键词: 电镀, 单层CBN, 占空比, 磨粒分布

Abstract:

A new method for evaluating the density and uniformity on electroplating single layer CBN thin-grinding-wheel was mentioned herein. The maximum area-percentage-concentration of CBN abrasive was derived by means of establishing mathematical model under the condition of single layer distribution. Combining the experimental results, the relationships among the space-factor, planting-grit time and grinding-wheel density and among the space-factor, planting-grit time and uniformity were analyzed. Then the changing regular of grinding-wheel density and uniformity were obtained at the different space-factor and planting time. It is shown in the experimental results that the nonuniformity of the grit distribution mainly presents the specific surface difference of crowded grit and the amount difference of non-crowded grit in each observation area when the average current density value is 0.6A/dm2 and the duty factor is from 0.4 to 0.6. When the average cathode current density value is 0.2A/dm2, and the duty factor is from 0.1 to 0.3, the nonuniformity of the grit distribution mainly presents the amount difference of non-crowded grit in each observation area. In addition, extending plant-grind-time can increase the density of grinding wheel effectively when the average value electric current is a constant, but the abrasive distribution level of uniformity will be reduced obviously.

Key words: electroplating, single-layer CBN, duty factor, abrasive distribution