Static pressure, static pressure bearing used for high speed precision machine tool principal axis

Abstract

The invention relates to a hydrostatic and hydro-dynamic / -static bearing on a hi-speed precision spindle, which comprises a spindle (1), and a bearing (2). On the surface of the bearing (2) opposite to the spindle (1), a plurality of hydrostatic oil cavities (12) are arranged, each is connected with the pipeline of each lubricating point (3) through the throttle of the bearing (11); the pipeline of each lubricating point (3) is connected with the oil-air fluid lubricant supply system through a general pipeline (4) of the bearing. The lubrication way in the invention is different from mist lubrication and oil-air lubrication, is the so-called ''sub-oil-air lubrication''. The invention can avoid any cavitation and gas explosion in the bearing, and give full play to the advantage of oil-air lubrication. With the invention, novel bearings with high speed, rigidity and long service life can be developed, the application field of hydrostatic, hydro-dynamic / -static slide bearing can be further expanded, and a new form of oil-air compound lubricated hydrostatic, hydro-dynamic / -static bearing can be explored in between the prior ordinary gas lubricated and fluid lubricated bearings.

Description

Technical field: [0001] The invention relates to a static pressure, dynamic and static pressure bearing used on the main shaft of a high-speed precision machine tool, in particular to a static pressure, dynamic and static pressure bearing lubricated by an oil-gas two-phase fluid. It belongs to the transformation technology of static pressure and dynamic and static pressure bearings. 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. The main shaft, in which the high-speed precision bearing is the supporting core of the main shaft. At present, there are three basic types of high-speed machine tool spindle bearings: ceramic bearings, magnetic bearings, and hydrostatic and hydrostatic sliding bearings. According to different lubricating media, hydrostatic and hydrostatic sliding bearings can be div...

AI Technical Summary

Problems solved by technology

The friction of air-lubricated bearings is very small, which is suitable for high-speed or even ultra-high-speed working conditions, but the rigidity of the air film is low, and the anti-overload ability is poor, so it can only be used for high-speed and light-load machine tool spindles

The oil film rigidity and carrying capacity of liquid lubricated bearings are relatively much larger, and the practical application range is wider than that of air lubricated bearings. However, liquid bearings generate heat very seriously during high-speed operation, and frictional heat greatly limits the increase in spindle speed.

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