Electric main shaft supported by adopting aerostatic bearing

Abstract

The invention discloses an electric main shaft supported by adopting an aerostatic bearing, comprising a shaft body, a front flange disc, a shell inner sleeve, a shell outer sleeve, a stator and a rear flange disc, wherein the front section of the shaft body is hemispherical to form a front supporting hemisphere, and the rear section of the shaft body is connected with a rear supporting hemisphere by an axial screw; the front end of the front flange disc and the rear end of the rear flange disc are respectively provided with a spherical bearing inner sleeve; the spherical bearing inner sleeve is externally provided with a spherical bearing outer sleeve; the spherical bearing inner sleeve and the spherical bearing outer sleeve form a spherical air bearing, and a central through hole is provided along the axial direction; the spherical bearing inner sleeve is internally provided with an air supplying runner and a plurality of rows of small throttling holes, and the inner surface of the inner sleeve is a ball socket corresponding to the supporting hemispheres. As the bearing supporting surface is a spherical surface, gas can realize radial and axial supporting function on the main shaft simultaneously after passing through the small throttling holes, so that the structure of the electric main shaft is simplified and the adaptability of the aerostatic bearing on different use requirements is improved to some extent.

Description

technical field [0001] The invention relates to an electric spindle of a numerically controlled machine tool, in particular to an electric spindle supported by an aerostatic bearing. Background technique [0002] At present, as the core component of CNC machine tools, the electric spindle is a necessary condition for ultra-precision machining. At present, the electric spindle is developing in the direction of higher precision and higher load capacity. [0003] At present, the structure of the electric spindle supported by gas static pressure bearing mainly adopts the support structure with radial and axial bearings separated, which to a certain extent leads to a large number of parts, difficult design of gas and liquid flow channels and complicated arrangement , It also makes the processing and assembly process more difficult. These factors make the electric spindle unable to achieve more ideal precision. [0004] In addition, due to the separation of radial and axial beari...

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Problems solved by technology

[0003] At present, the structure of the electric spindle supported by gas static pressure bearing mainly adopts the support structure with radial and axial bearings separated, which to a certain extent leads to a large number of parts, difficult design of gas and liquid flow channels and complicated arrangement , also makes the processing and assembly process more difficult, these factors make the electric spindle unable to achieve more ideal precision

[0004] In addition, due to the separation of radial and axial bearings, it is necessary to change the overall size and structure of the electric spindle when it is necessary to increase the bearing capacity of the aerostatic electric spindle. Therefore, the aerostatic electric spindle with radial and axial bearings is separated Poor adaptability to the use environment

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