微量润滑平面磨削的气流场建模与仿真分析

Modeling and Simulation Analysis of Air Flow Field in Minimal Quantities of Lubricant Surface Grinding

随着高端装备制造业的迅猛发展,微量润滑技术在磨削加工领域得到广泛应用。磨削区气流场的作用机理与分布形态,是影响微量润滑介质雾化射流进入磨削区有效冷却润滑的重要研究对象。本文开展平面磨削的气流场理论分析、模型构建、仿真计算,对不同砂轮速度工况下的气流场速度与压力分布进行计算分析。研究发现:受砂轮表面的携带与粘滞作用,将会在砂轮表面形成圆周环流“气障层”,并受磨削楔形空间作用,在磨削入口工件表面上方形成反向气流层;随着砂轮转速升高,砂轮表面圆周环流速度增大、工件表面反向气流层增大、磨削入口楔形区相对压力值增大。

With the rapid development of high-end equipment manufacturing industry,minimal quantities of lubricant(MQL)technology has been widely used in the field of grinding processing.The action mechanism and distribution pattern of air flow field in grinding zone are important research objects which affect the effective cooling and lubrication of(MQL)medium atomized jet entering grinding zone.In this paper,the theoretical analysis,model construction and simulation calculation of air flow field in surface grinding are carried out,and the distribution of air flow velocity and pressure under different grinding wheel speed conditions are calculated and analyzed.It is found that the circular circulation"gas barrier layer"will be formed on the grinding wheel surface due to the carrying and viscous effect of the grinding wheel surface,and the reverse airflow layer will be formed on the workpiece surface at the grinding inlet due to the effect of the grinding wedge space.With the increase of grinding wheel speed,the circular circulation speed of grinding wheel surface increases,the reverse airflow layer of workpiece surface increases,and the relative pressure value of grinding inlet wedge area increases.