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In order to analyze the 170SD30-SY motorized spindle bearing cooling effect of the oil-gas lubrication system, a fluid - solid coupling heat transfer model established in finite element software. It is realized by way of numerical simulations on the ground of theoretical analysis. By changing the compressed air pressure, the characters of bearing temperature was studied. Simulation results show that control the inlet air pressure in a reasonable range can make the temperature rise of the bearing control in a reasonable scope. Experiments were conducted according to the results of the simulation analysis and the experimental temperature is consistent with simulation results. Finally, a theoretical basis is offered for the parameter optimization of motorized spindle Oil-gas lubrication system which can meet the requirements of high-speed spindle bearing cooling technology.

The Effects of oil-gas Lubrication Air Pressure on the Bearing Temperature of Motorized Spindle