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Ultrahigh-precision aerostatic bearing main shaft system

A technology of aerostatic pressure and bearings, applied in metal processing equipment and other directions, can solve the problems of complex structure of the spindle system, poor accuracy retention, and high assembly requirements, and achieve the effects of good accuracy retention, high rotation accuracy, and a small number of

Inactive Publication Date: 2011-09-14
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an aerostatic bearing spindle system with simple structure, few parts, good structural stability and ultra-high precision, which is used to solve the problem of complex structure of the spindle system in existing ultra-precision machine tools, many parts, Some problems with high assembly requirements and poor accuracy retention

Method used

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  • Ultrahigh-precision aerostatic bearing main shaft system
  • Ultrahigh-precision aerostatic bearing main shaft system
  • Ultrahigh-precision aerostatic bearing main shaft system

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specific Embodiment approach 1

[0021] Specific implementation mode one, Figure 2A and Figure 2B Shown is the ultra-high-precision aerostatic bearing spindle system of the present invention, which includes a rotating shaft 1, a spindle box 2 and a spindle box end cover 3, and the rotating shaft 1 is installed in the spindle box 2, supported by an aerostatic bearing and relative to the spindle The box 2 rotates and the aerostatic bearing is integrated in and with the headstock 2, thus achieving the simplest configuration.

[0022] Main shaft box 2 is provided with a main cavity, the inner surface 2a of the main cavity is cylindrical and can be used for the journal bearing surface of an aerostatic bearing, the axis of the inner surface 2a of the main cavity is 12, the main cavity The inner surface 2 a faces the corresponding cylindrical outer surface 1 a of the rotating shaft 1 . Two exhaust grooves 24 and corresponding exhaust flow passages 24a may be provided on the inner surface 2a of the main bore, and...

specific Embodiment approach 2

[0028] Specific embodiment two, combine Figure 2B This embodiment is described. In this embodiment, the radial restrictors 21a provided on the inner surface 2a of the main bore of the headstock 2 are arranged in a row along the direction of the axis 12 .

specific Embodiment approach 3

[0029] Specific implementation mode three, combination Figure 2B The present embodiment will be described. In this embodiment, the radial restrictors 21 b provided on the inner surface 2 a of the main bore of the headstock 2 are arranged in a row along the direction of the axis 12 .

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Abstract

The invention discloses an ultrahigh-precision aerostatic bearing main shaft system comprising a rotating shaft (1), a main shaft box (2) and a main shaft box end cover (3), wherein the rotating shaft (1) is installed in the main shaft box (2), is supported by means of an aerostatic bearing and rotates relative to the main shaft box (2), and the aerostatic bearing is integrated in the main shaft box (2) and is integrated with the main shaft box, therefore, a simplest structure is realized. The main shaft box (2) is internally provided with a thrust boss (28) and an axial air film gap for connecting the main shaft box end cover (3) and forming a thrust bearing. The inner surface (2a) of the main hole cavity of the main shaft box (2) is provided with a vacuum annular groove (25) which is arranged between two air exhaust grooves (24), the main shaft box (2) is provided with a vacuum port (29) which forms a connected vacuum air path together with a radial hole (13) and a central hole (11)which are arranged in the rotating shaft (1), and when installed on the end face of the rotating shaft, a vacuum chuck can be used for absorbing workpieces.

Description

technical field [0001] The invention relates to a spindle system of a machine tool, in particular to an ultra-high-precision aerostatic pressure bearing spindle system. Background technique [0002] In ultra-precision machining machine tools, the spindle system is the core component of the machine tool, and its accuracy directly affects the machining accuracy of the parts. Aerostatic bearings are widely used in the spindle system of ultra-precision machine tools due to their high rotation accuracy, small temperature rise and small thermal deformation errors during high-speed rotation. In the design of the spindle system of ultra-precision machine tools, the principles of simple structure, few parts, good assembly performance, and good dimensional stability should be followed, so that the spindle system can achieve extremely high rotation accuracy and stability. Commonly used aerostatic bearings are divided into two types according to the structural shape of the shaft: T-typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B19/02
Inventor 杜建军
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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