离心研磨过程中磨料流态特征受传动比影响的实验和理论研究

Influence of Planetary Drive Ratio on Characteristics of Fluid State in Centrifugal Polishing Process

离心研磨过程中,磨料运动的流态特征对工件的加工质量和生产效率有明显影响。而研磨机的行星传动比是改变磨料流态特征的重要参数。本文以在离心场中运动的整团磨料为研究对象,从实验和理论两方面分析了离心式研磨在加工过程中行星传动比对加工质量和加工效率的影响。根据工件磨损率的测定,说明了不同行星传动比对加工过程的影响。理论方面利用液固两相流动力学模型分析了不同行星传动比时磨料的流态特征。用计算流体力学的方法描绘出典型行星传动比下磨料运动的形貌图形。图形反映出磨料团的浓度和速度分布。理论分析与实验结果是一致的。指出这种理论分析方法能够代替大量的实验对做离心运动的整团磨料不同区域的浓度、速度和加速度进行分析,对于优化设计参数、提高生产率十分经济有效。

The kinematic characteristics of the abrasive fluid are closely related to the quality and efficiency of workpiece in the centrifugal polishing, and the planetary driver ratio of the machine is an important parameter to change the the fluid characteristics. Taking the kinematic mass abrasive as research object, this paper analyzed theoretically and experimentally the influence of the planetary driver ratio in the process of centrifugal polishing. In light of the experimental data, it was explained how the different planetary driver ratio affect the polishing process. Theoretically, a model of two phase fluid is used to analyze the abrasive fluid characteristics at different planetary driver ratio. The shape figure, which illustrate the abrasive movement on typical planetary drive ratio and show the distribution of abrasive volume fraction and velocity, was plotted by the method of computational fluid mechanics. The good accordance between the numerical simulation and the experimental result point out that numerous technical experiments can be substituted by numerical simulation with computer. By utilizing the numerical method, the parameters of design and technology can be optimized economically and efficiently, which can ultimately improve the productivity.