陶瓷CBN砂轮高效磨削的弧区冷却液动压力研究

Study on the hydrodynamic fluid pressure within grinding zone with vitrified CBN wheel

针对磨削弧区冷却液的流场特性,分析了磨削工艺参数和空气挡板对磨削弧区冷却液动压力的影响规律。实验表明:各磨削工艺参数中,磨削速度对弧区冷却液动压力的影响最大,压力值随着磨削速度的提高呈先上升后下降的趋势;使用空气挡板可在一定磨削速度范围内提高弧区冷却液动压力。最后基于弧区压力与热流密度的关系,分析了磨削速度(30 m/s≤v_(?)≤120 m/s)对工件表面烧伤的影响。该结果可从充分发挥冷却液效果,并从避免磨削烧伤的角度为磨削速度的选择提供依据。

Focused on the flow field characteristic of coolant in grinding zone,the effects of grinding parameters and air scraper on the hydrodynamic pressure within grinding zone are analyzed.The results show that the grinding speed has the most important influence on the hydrodynamic pressure,and that the pressure appears to have a decline trend after an initial ascend.The air scraper can improve the pressure in a certain range of grinding speed.Finally,based on the analysis of the pressure and heat flux,the effect of grinding speed(30m/s ≤v_N≤120 m/s) on grinding burn is studied,the results of which provide basis for the selection of grinding speed in the view of making full use of coolant to avoid grinding burn.