Structural form of two-support spindle rolling bearing of gantry milling machine

2020-03-06 08:47


The reasonable arrangement of the main shaft rolling bearings of the gantry milling machine, the structural form of the two supporting main shaft bearings, the configuration of the two supporting main shaft bearings, including the selection, combination and arrangement of the main shaft bearings. It is mainly based on the requirements of the designed spindle components in terms of speed, load capacity, stiffness and accuracy. The arrangement form of two-bearing spindle rolling bearings is given. The following general principles should be followed when determining the configuration of the two-supporting spindle bearings:

1) The requirements of rigidity and load capacity of a gantry milling machine should first meet the required stiffness and load capacity. When the radial load is large, the bearing configuration can be used; when the radial load is small, the configuration can be used. In addition, double-row bearings have higher stiffness than single-row bearings. Since increasing the rigidity of the front support can effectively increase the rigidity of the main shaft component, the bearing for improving the rigidity should be arranged in the front support.

2) The maximum speed allowed for the gantry milling machine to meet the speed requirements of different types, specifications and accuracy grades of bearings is different. Under the same conditions, point contact is higher than line contact; cylindrical rollers are higher than ring tapered rollers. Therefore, it is necessary to comprehensively consider the requirements of the rigidity and the speed of the spindle components to select the bearing arrangement.

3) Requirement of accuracy of gantry milling machine The main shaft component bearing axial thrust bearing arrangement directly affects the axial position accuracy of the main shaft. Working performance and application range of three commonly used configuration forms. When the front end is positioned, the main shaft is heated and deformed to extend backward, 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 is heated a lot. The characteristics of rear-end positioning are the opposite of the above. When both ends are positioned, the axial clearance of the bearing changes greatly when the spindle is heated and stretched.

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