Hydrodynamic-hydrostatic suspension mainshaft bearing

Abstract

The invention relates to a hydrodynamic-hydrostatic suspension mainshaft bearing which mainly comprises a mainshaft and a bearing, wherein the surface (opposite to the mainshaft) of the bearing is provided with a plurality of hydrostatic oil chambers, each hydrostatic oil chamber is respectively communicated with a lubricating-point pipeline by a bearing throttler, and each lubricating-point pipeline is connected with an oil body lubricated supply system by a main bearing pipeline; and the mainshaft bearing is characterized in that one or more overflow pressure regulating balancing holes are arranged on the hydrostatic oil chamber, and the overflow pressure regulating balancing holes are communicated with the oil body lubricated supply system. The hydrodynamic-hydrostatic suspension mainshaft bearing has the beneficial effects that an machine tool using the mainshaft bearing is high in rotation accuracy; the motion accuracy of the mainshaft is 0.1mu m-0.5mu m, the motion accuracy of the mainshaft subjected to accurate grinding can reach Ra0.01mu m, and the processing roundness error is 0.1mu m; the anti-vibration performance is strong: the adopted oil has a great vibration-absorbing capacity, therefore, the influence caused by outside vibrations can be weakened; the carrying capacity is large; the hydrostatic and hydrodynamic-hydrostatic mainshafts have strong carrying capacities, therefore, the mainshaft is suitable for the high-power and full-load cutting of various machine tools; the rigidity is high; and the mainshaft bearing is strong in oil rigidity.

Description

technical field [0001] The invention belongs to static pressure and dynamic and static pressure bearings on the main shaft of high-speed precision machine tools, in particular to a liquid dynamic and static pressure suspension main shaft bearing which can reduce the radial runout of the main shaft. Background technique [0002] At present, high-speed CNC machining technology is an advanced manufacturing technology that realizes high-quality, high-efficiency, low-consumption, flexible, and environmentally-friendly processing. High-speed CNC machine tools are advanced manufacturing equipment that realizes high-speed machining. The primary key technology of high-speed CNC machine tools is high-speed and high-power spindles. Among them, the high-speed precision bearing is the supporting core of the main shaft. High-speed machine tool spindle bearings mainly include basic types such as ceramic bearings, magnetic bearings, hydrostatic bearings, and dynamic pressure bearings. Amon...

AI Technical Summary

Problems solved by technology

Over the years, it has been found that the hydrodynamic and static pressure suspension spindle bearings are limited by the machining accuracy. When the cutting depth of the machine tool changes, the force on the spindle will be uneven. At this time, the spindle will have a small displacement, that is, radial Runout, thus affecting the geometric accuracy and surface finish of the machined workpiece

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