Air flotation main shaft and machine tool

Abstract

The invention discloses an air flotation main shaft and a machine tool. The air flotation main shaft comprises a body, a central spindle, an aerostatic bearing and an aerodynamic bearing, wherein thebody is provided with a shaft hole and an airflow channel; the central spindle is arranged in the shaft hole in a penetrating mode and is provided with a thrust flying disk; the aerostatic bearing comprises a first aerostatic bearing, a second aerostatic bearing and a thrust bearing, the first aerostatic bearing and the second aerostatic bearing are both arranged in the shaft hole and both matchedwith an outer circle bearing surface of the central spindle, the thrust bearing is matched with the thrust flying disk, and the first aerostatic bearing, the second aerostatic bearing and the thrustbearing are respectively provided with air inlet holes which communicate with the airflow channel; and the aerodynamic bearing is arranged in the shaft hole, located between the first aerodynamic bearing and the second aerodynamic bearing and matched with the outer circle bearing surface of the central spindle. By using the aerodynamic bearing and the aerostatic bearing simultaneously, it can be guaranteed that the radial carrying capacity of the main shaft is enhanced while the main shaft maintains high speed, so that product performance is improved, and machining difficulty is lowered.

Description

technical field [0001] The invention is used in the field of machine tools, and in particular relates to an air-floating spindle and a machine tool. Background technique [0002] Due to its low loss, small friction and error homogenization phenomenon, the air-bearing spindle can perform high-precision processing such as high-gloss processing at high speeds. However, compared with ball-supported or hydraulic-supported spindles, most air-bearing spindles have problems such as small bearing capacity and insufficient rigidity. Generally, the bearing capacity is increased by increasing the size of the air-bearing bearing, which will greatly increase the processing difficulty and At the same time, the limit speed of the main shaft will also be reduced; in addition, for the main shaft with the rear of the motor, the bearing capacity can be increased by using a fully supported aerostatic bearing. Similarly, due to the longer length of the fully supported aerostatic bearing, its Pro...

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Problems solved by technology

However, compared with ball-supported or hydraulic-supported spindles, most air-bearing spindles have problems such as small bearing capacity and insufficient rigidity. Generally, the bearing capacity is increased by increasing the size of the air-bearing bearing, which will greatly increase the processing difficulty and At the same time, the limit speed of the main shaft will also be reduced; in addition, for the main shaft with the rear of the motor, the bearing capacity can be increased by using a fully supported aerostatic bearing. Similarly, due to the longer length of the fully supported aerostatic bearing, its It is relatively difficult to process

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