Abstract: In order to optimize the minimal quantities lubrication parameters and improve the cooling and lubrication effect of the minimal quantities lubrication, the flow field of the grinding wheel and the trajectory of the grinding fluid droplets in the flow field were studied, and the factors affecting the effective flow of the grinding fluid were explored.Based on twodimensional simulation model and the k-ε turbulence model, the flow field of the grinding wheel was simulated through FLUENT software, and the flow field distribution under different parameter conditions was obtained. Based on the discrete phase model, the motion trajectory of the grinding liquid droplets was simulated, and the droplet trajectory state under different parameter conditions was obtained. The research results show that, with the increase of the linear speed of the grinding wheel and the decrease of the minimum gap, the return flow in the grinding zone continues to increase. The effective flow of grinding fluid into the grinding zone is related to the linear velocity of the grinding wheel and the pressure of compressed air. Under the same linear velocity, the effective flow rate of grinding fluid first increases and then decreases with the increase of compressed air. The flow of grinding fluid has little effect on the effective flow entering the grinding zone.

Key words:  grinding fluid; air flow field; minimal quantities lubrication (MQL); effective flow rate