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Hydrostatic gas bearing spindle

A static pressure gas bearing and spindle technology, which is applied to large fixed members, metal processing machinery parts, metal processing equipment, etc., can solve problems such as thermal expansion, and achieve the effect of suppressing position changes

Inactive Publication Date: 2016-04-06
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the temperature change of the environment or the heat generated by the rotation of the rotating shaft of the static pressure gas bearing spindle will cause thermal expansion of the components of the static pressure gas bearing spindle.

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0049] First, the configuration of the static pressure gas bearing main shaft according to Embodiment 1 of the present invention will be described.

[0050] Such as figure 1 and figure 2 As shown, the static pressure gas bearing spindle of this embodiment is a static pressure gas bearing spindle fixed to the installation surface PS. The static pressure gas bearing main shaft mainly has a rotating shaft 1 , a housing 2 , a first fixed table 3 and a second fixed table 4 .

[0051]The rotary shaft 1 has a mounting surface 1 a on an end surface on which a workpiece can be mounted. Housing 2 is separated by a bearing gap for supplying bearing gas (refer to image 3 ) to surround the outer peripheral surface of the rotating shaft 1, and the bearing uses gas to support the rotating shaft 1 so as to be rotatable.

[0052] The first fixing table 3 and the second fixing table 4 are spaced apart from each other along the axis AX direction of the casing 2 . The first fixed platform ...

Embodiment approach 2

[0095] Embodiment 2 of the present invention has the same configuration as Embodiment 1 unless otherwise specified, and therefore the same elements are denoted by the same symbols and descriptions thereof will not be repeated.

[0096] In Embodiment 1, the structure in which the displacement due to thermal expansion is released in a direction that does not affect it was described, but it is also applicable to the structure in which the amount of displacement itself due to thermal expansion is also suppressed.

[0097] look again figure 1 , Some or all of the components of the static pressure gas bearing main shaft of this embodiment are made of a material with a low thermal expansion coefficient (low thermal expansion material). Specifically, the first fixed platform 3 and the second fixed platform 4 preferably use a thermal expansion coefficient of 8×10 -6 / K or less materials. Especially the second fixed table 4 is preferably 8 * 10 with a coefficient of thermal expansion....

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Abstract

The hydrostatic gas bearing spindle that is affixed to a mounting surface (PS) is provided with: a pivot (1) having a fastening surface (1a) on an end face; a housing (2) that surrounds the outer circumferential surface of the pivot (1) with a bearing clearance (10), into which a bearing gas for rotatably supporting the pivot (1) is supplied, therebetween; and first fixing boards (3) and second fixing boards (4) that are disposed at a distance from each other in the direction of the axial line (AX) of the housing (2) and are for fixing the housing (2) to the mounting surface (PS). The second fixing boards (4), which are disposed at positions that are farther from the fastening surface (1a) than the first fixing boards (3), comprise a linear guide mechanism (5) that is capable of linear guidance in the axial direction (AX). A hydrostatic gas bearing spindle that can limit changes in the position of the fastening surface (1a) can thereby be obtained.

Description

technical field [0001] The invention relates to a static pressure gas bearing main shaft, in particular to a static pressure gas bearing main shaft fixed on a setting surface. Background technique [0002] The static pressure gas bearing spindle is used in precision machining equipment and precision inspection equipment, etc. In particular, when a hydrostatic gas bearing spindle is used in a precision machining device, it is desirable that the positional variation of the workpiece mounting surface (mounting surface) on which the workpiece (workpiece) is fixed is small in order to perform high-precision machining. [0003] However, changes in ambient temperature or heat generated by the rotation of the rotary shaft of the static pressure gas bearing main shaft cause thermal expansion of components of the static pressure gas bearing main shaft. As a result, the position of the mounting surface changes. For example, Japanese Patent Application Laid-Open No. 2006-263824 (Paten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q1/72B23B19/00B23Q1/38B23Q1/40B23Q1/58B23Q1/70
CPCB23Q1/70
Inventor 堀内照悦
Owner NTN CORP