Imported bearing grinding machine maintenance method of hydrostatic bearing, a bearing in knowledge

Hydrostatic bearing imported with high rotation accuracy, good rigidity, high bearing capacity, no wear and high durability. 1. Small hole choke: ( 1) 。 Change the internal throttling to external throttling, and equipped with pressure gauge pressure inferior vena instantly. Make maintenance convenient, especially can easily be regular cleaning, this is an internal choke. ( 2) 。 The throttling ratio. Throttle than beta theoretical value is 1. 2 to 1. Based on years of experience between 5 and 1. 25 is preferred. In maintenance, so need to before and after the geometrical precision of the spindle, the geometry precision of bearing bush, alignment, roundness and taper of strict control, in order to ensure the beta. Determined according to bearing capacity of the machine tool value (e The center of the spindle and bearing shell geometric eccentricity) Best, make the beta. ( 3) 。 Fit in the oil chamber not spindle, the oil outlet oil column must be consistent ( Observation) , if not consistent, should be taken to change the choke aperture method, to change its flow. 4 cavity, for example, general, left, right cavity under the oil column of between 20 ~ 25 mm, pore diameter of 0. 25 ~ 0. 4mm。 2. Thin-film feedback choke: feedback throttle imported bearing stiffness is very big, but our machine also often appear in the operation, the phenomenon such as hair, off pressure. Thin-film feedback is the most critical, practice that bearing lock, hair, the main reason is: (1) thin film caused by plastic deformation; (2) feedback slowly. External load mutation, film also have no reaction, shaft and tile has been friction; (3) thin film fatigue. Film with long time, fatigue deformation, equivalent to change the feedback parameters. Increasing the thickness of the film and use some fatigue resistant material, all can get good result. Usually adopt rigid film, preload lotus, reserved aperture method. Specific approach is: 1. 4 mm thick film instead of 4 mm thick membrane rigidity, the inferior vena pad 0. 5 mm thick foil paper, make the spindle adjusting to higher than the ideal position 0. The location of the 5 mm. Purpose is when the main shaft bearing ( Grinding wheel weight, cutting force) Later, just return to the ideal center.