Thin-film restrictor hybrid bearing for roll grinder grinding wheel spindle

Abstract

The invention provides a thin-film restrictor hybrid bearing for a roll grinder grinding wheel spindle. The bearing comprises an upper static pressure cavity and a lower static pressure cavity, wherein the upper static pressure cavity and the lower static pressure cavity are symmetrically arranged. The upper static pressure cavity and the lower static pressure cavity are connected with an external oil inlet hole and connected with a double-sided thin film restrictor through an oil way. The bearing further comprises a front static pressure cavity and a rear static pressure cavity. The front static pressure cavity is connected with the external oil inlet hole and communicated with a single-sided thin film restrictor through the oil way. According to the thin-film restrictor hybrid bearing, the design problem of a thin-film restrictor hybrid bearing for a roll grinder grinding wheel spindle is solved. Compared with a traditional capillary restrictor hybrid bearing, the thin-film restrictor hybrid bearing has higher rigidity under the condition of starting static pressure; meanwhile, the thin-film restrictor hybrid bearing has higher bearing capacity, higher rigidity and lower temperature rise under the hybrid condition when the spindle rotates at a high speed, and therefore the thin-film restrictor hybrid bearing meets the requirements of modern development of roll grinders for high efficiency, high rigidity, high accuracy and the like.

Description

technical field [0001] The invention relates to the field of the main shaft bearing of the grinding wheel of a roll grinder, in particular to a flow static pressure bearing of a thin film section of the main shaft of the grinding wheel of a roll grinding machine. Background technique [0002] At present, for the dynamic and static pressure hybrid bearings of the grinding wheel spindle of the roll grinder, the capillary restrictor in the fixed throttling is mostly used. The main reason is that the capillary restrictor has the following advantages: first, it is simple to manufacture; second, the load and stiffness of the capillary throttling hydrostatic bearing have nothing to do with the viscosity and temperature rise of the lubricating oil; third, the manufacturing error of the allowable clearance of the bearing is larger, allowing The operating temperature of the bearing varies greatly. However, the designed bearing has the following problems: first, the stiffness of the o...

AI Technical Summary

Problems solved by technology

However, the designed bearing has the following problems: first, the stiffness of the oil film is not very large, so that the machining accuracy of the grinding wheel spindle cannot be improved; second, the temperature of the oil film is relatively high under the high-speed condition of the bearing, so that the bearing will have a large temperature due to uneven temperature distribution. thermal deformation, which in turn affects the clearance between the spindle bearings, and finally affects the machining accuracy of the machine tool

However, film restrictors have been used in hydrostatic bearings with symmetrical structures before. There is no design precedent for hydrostatic bearings and hydrostatic bearings with asymmetric structures. There is a technical bias in the industry.

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