Abstract:A steadystate microthermal elastohydrodynamic lubrication grinding wheel model was established to study the effects of different grinding fluids on the hydrodynamic effects of ceramic corundum grinding wheels on cylindrically ground bearing steels(GCr15),based on the theory of elastic hydrodynamic lubrication.The effects of watersoluble grinding fluid,emulsified liquid,oilsoluble grinding fluid and paraffin oil grinding fluid on hydrodynamic pressure,and the temperature changes of the grinding zone with four different grinding fluids were compared and analyzed.The effect of different oil phase volume fraction on the dynamic pressure effect of the grinding zone was analyzed when the grinding fluid is an emulsified liquid.The results show that regardless of the effect of roughness,the overall pressure is the lowest and the overall film thickness is the largest when paraffin oil is used as grinding fluid,while the grinding zone temperature with watersoluble grinding fluid is lower than that with oilsoluble grinding fluid during the grinding process.Considering various factors comprehensively,emulsions are selected as the emulsified liquid to obtain better grinding effect and lower surface grinding temperature.The larger the oil phase volume fraction of the emulsified liquid,the smaller the overall pressure,the larger the minimum film thickness,and the faster the temperature rise in the grinding zone.To ensure that the temperature in the grinding area is not too high,the oil phase volume fraction is generally not more than 20%.