The following general principles should be followed when determining the two-bearing spindle bearing configuration:
1) The five-sided gantry milling machine should first meet the required stiffness and load carrying capacity to meet the requirements of stiffness and load carrying capacity. When the radial load is large, the bearing configuration can be selected; when it is small, the configuration can be selected. In addition, double row bearings are stiffer than single rows. Since the rigidity of the front support can be increased to effectively increase the rigidity of the main shaft member, the bearing with improved rigidity should be disposed on the front support.
2) Five-sided gantry milling machine adapts to the speed requirements The maximum speed allowed by bearings of different types, specifications and accuracy grades is different. Under the same conditions, the point contact is higher than the line contact; the cylindrical roller is higher than the ring roller. Therefore, the bearing configuration should be selected considering the requirements of the stiffness and speed of the spindle components.
3) Five-sided gantry milling machine adapts to the accuracy requirements The spindle component is subjected to axial thrust thrust bearing configuration, which directly affects the axial position accuracy of the spindle. The working performance and application range of the three commonly used configuration forms. When the front end is positioned, the main shaft is extended by heat deformation, which does not affect the machining accuracy, but the front support structure is complicated. It is inconvenient to adjust the bearing clearance, and the front support heat is large. The characteristics of the back-end positioning are opposite to the above. When the two ends are positioned, the axial clearance of the bearing changes greatly when the spindle is heated and extended.
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