Investigation on a grinding motorized spindle with miniature-revolving-heat-pipes central cooling structure

Abstract

Abstract As one of the fundamental parts of machine tools, central cooling problem of high-speed motorized spindle is the bottleneck restricting the further improvement of machining accuracy. A central cooling structure for grinding motorized spindle (150SD) is proposed under the inspiration of the principle of miniature-revolving-heat-pipes (MRVHPs). The thermal performance of MRVHPs is experimentally investigated at different operational conditions, and the equivalent thermal conductivity of the MRVHPs is obtained. In order to verify the applicability of the MRVHPs central cooling structure, a transient-thermal and static-structure simulation model for 150SD is established and then validated experimentally. The results show that the coupling simulation model can accurately predict the temperature rise and the thermal deformation at the tool holder. Subsequently, the effectiveness of the MRVHPs central cooling structure for 150SD is verified with the coupling simulation model. The results indicate that the proposed MRVHPs central cooling structure can effectively control the temperature rise inside the motorized spindle, and the total deformation of the tool holder has been reduced by 33.3%.