Air-floating high-speed electric spindle

Abstract

The invention relates to an air-floated high-speed motorized spindle. The air-floated high-speed motorized spindle comprises a machine body, a spindle core and two bearing seats, wherein a compressed air passage is formed in the machine body; a plurality of air inlet holes and a plurality of air outlet holes are formed in each bearing seat, radial damping plugs are mounted in the air outlet holes, each radial damping plug is provided with a stable chamber, which is located at the inner side end of the corresponding radial damping plug, and a throttling hole, which is located at the outer side of the corresponding stable chamber and communicates the corresponding stable chamber and the corresponding air outlet hole, and converging holes which communicate the outer side ends of the throttling holes of the axially-arranged radial damping plugs are formed in the bearing seats and extend to the end faces of the bearing seats; the end parts of the outer sides of the air inlet holes in the two bearing seats are communicated with the compressed air passage. According to the air-floated high-speed motorized spindle, the phase of compressed air is lagged, and the self-excited vibration point of the air-floated high-speed motorized spindle is delayed, so that the spindle core has higher stability when the spindle core of the air-floated high-speed motorized spindle rotates, and particularly, the spindle core has higher stability at high-speed rotation when small holes of workpieces are drilled.

Description

technical field [0001] The invention relates to the technical field of electric spindles, in particular to an air-floating high-speed electric spindle. Background technique [0002] The air-floating electric spindle is a new type of CNC machining device. It uses high-pressure air film to support the shaft core, and realizes radial and axial loads on the shaft core. Compared with the traditional bearing bearing method, it has low power consumption, etc. advantage. The current air-floating electric spindle usually installs intake damping plugs on the upper bearing seat and the lower bearing seat, and uses the damping plug to introduce high-pressure gas. The gap between the high-pressure gas in the inner hole of the bearing seat and the outer surface of the shaft core, and the bearing A high-pressure air film is formed between the end face and the end face of the shaft core to support the shaft core at both radial and axial ends. [0003] During the use of the current air-flo...

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Problems solved by technology

[0003] During the use of the current air-floating electric spindle, because the compressed gas is throttled into the gap between the bearing seat and the shaft core through the damping plug, the shaft core deflection is relatively large when the shaft core rotates at ultra-high speed to drill small holes. Serious, poor stability, therefore, it is difficult to be used to process small holes in workpieces

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