Abstract: Aiming at the influence of flow design on spindle temperature rise and service life during motorized spindle operation, the influence of flow of motorized spindle water cooling system on spindle temperature was simulated, analyzed and tested. Firstly, based on the actual use of motorized spindle, its working conditions were divided into three types: common working conditions, low speed and small torque, no-load maximum speed and low speed maximum torque, and the heating capacity of key components of spindle under different working conditions was calculated. Then, the finite element simulation model of the temperature field of the whole spindle was established, and the analysis of the optimal flow was refined to the common cutting conditions of the spindle. At the same time, in order to avoid the problems of shortening the service life a failure of the spindle caused by insufficient flow supply, the calculation method of the minimum flow was proposed. Finally, the motorized spindle temperature rise test platform was built to test the temperature rise of key parts of the spindle under common working conditions, and the error of the simulation model was verified combining with the test results. The results show that the error between the simulation results and the test is less than 5%. The simulation model is reliable. The analysis shows that the optimal cooling flow of motorized spindle under common working conditions is 8 L/min, the minimum flow under bad no-load is 0.4 L/min, and the minimum flow under bad load is 0.67 L/min. The results provide a theoretical basis for the flow design in the actual operation engineering of motorized spindle.

Key words:  motorized spindle; temperature rise; optimal flow; minimum flow

LIU Lei, WANG Ting, HE Zhen-tao, et al. Influence of cooling system flow on motorized spindle temperature［J］.Journal of Mechanical & Electrical Engineering, 2022,39(2):250-254.