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Dynamic pressure cylinder body bearing shaft system and precision machine tool

A precision machine tool and bearing technology, applied in the field of machinery, can solve the problems of high processing precision and high processing cost, and achieve the effect of reducing processing difficulty, reducing processing cost and improving work efficiency

Inactive Publication Date: 2018-05-29
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the basic principle of gas (air) or liquid (oil) dynamic pressure technology, the liquid or gas medium enters the multiple chambers of the concave cylindrical surface of the cylinder bearing respectively. When the convex cylinder rotates, the medium flows from the multiple chambers. The dynamic pressure is formed in the middle, the higher the speed of the convex cylinder, the higher the density of the medium, the smaller the gap between the concave and convex cylinders, the greater the dynamic pressure, because there is a certain gap between the concave and convex cylinders, the convex cylinder floats, and it is in non-contact when rotating state, but the machining accuracy of the concave cylindrical surface and the chamber of the cylindrical bearing is high, and the machining cost is high

Method used

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  • Dynamic pressure cylinder body bearing shaft system and precision machine tool
  • Dynamic pressure cylinder body bearing shaft system and precision machine tool
  • Dynamic pressure cylinder body bearing shaft system and precision machine tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, the dynamic pressure cylindrical bearing shaft system 100 includes two dynamic pressure cylindrical bearings and a rotating shaft 40 .

[0031] The dynamic pressure cylinder bearing includes a containing assembly 10 , a rotating member 20 and a support seat 30 .

[0032] Such as figure 2 As shown, the containing assembly 10 includes a containing part 11 and a plurality of dynamic pressure bushings 12 .

[0033] Such as image 3 As shown, the receiving part 11 includes a concave cylindrical surface 111 , an outer surface 112 , a plurality of dynamic pressure channels 113 and a through hole 114 .

[0034] However, in some occasions where the shaft does not need to pass through, the receiving part 11 may not be provided with the through hole 114 . In this embodiment, the receiving part 11 is provided with a through hole 114 for passing the rotating shaft 40 in the horizontal direction at the center of the inner concave cylindrical surface 11...

Embodiment 2

[0047] Other structures of this embodiment are the same as those of Embodiment 2, except that the shape of the opening of the dynamic pressure cavity 121 is any one of circle, ellipse, square, rectangle and trapezoid. The section of the dynamic pressure cavity 121 along the layout plane is crescent-shaped or wedge-shaped,

[0048] The shape of the opening of the dynamic pressure cavity 121 in the second embodiment is trapezoidal, and the section along the arrangement plane is crescent-shaped.

Embodiment 3

[0050] The other structure of this embodiment is the same as that of the second embodiment, except that the depth of the dynamic pressure cavity 121 is 4-8 mm, and the total surface area of ​​the dynamic pressure cavity 121 accounts for 40-60% of the total surface area of ​​the concave cylindrical surface.

[0051] In the third embodiment, the concave depth of the dynamic pressure cavity 121 is 4 mm, and the total surface area of ​​the dynamic pressure cavity 121 accounts for 45% of the total surface area of ​​the concave cylindrical surface 11 .

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Abstract

The invention relates to a dynamic pressure cylinder body bearing shaft system and a precision machine tool. The dynamic pressure cylinder body bearing shaft system comprises one or more dynamic pressure cylinder body bearings and a rotating shaft. Each dynamic pressure cylinder body bearing is provided with a support seat, a containing assembly and a rotating part. Each containing assembly comprises a containing part and multiple dynamic pressure bushes. Each containing part is provided with multiple dynamic pressure channels used for allowing fluid to pass through. Each dynamic pressure channel is formed in the inner wall of the corresponding containing part and penetrates a corresponding inwards-sunken cylindrical surface and a corresponding outer surface. Each dynamic pressure bush isarranged at an opening of a first cavity, and an opening of each dynamic pressure cavity faces the corresponding inwards-sunken cylindrical surface. The cross section of each dynamic pressure cavity is gradually enlarged from the bottom to the corresponding opening. The multiple dynamic pressure bushes are arranged on the corresponding inwards-sunken cylindrical surface along one or more arrangement planes. Each support seat is provided with a support seat inner chamber matched with the outer surface of the corresponding containing part. According to the dynamic pressure cylinder body bearingshaft system, in the working state, a protruding cylinder is not in contact with a sunken cylindrical surface in the rotating process, and therefore, the dynamic rotation precision of the rotating shaft on a rotating pair can be improved through the gas or liquid dynamic pressure technology.

Description

technical field [0001] The invention belongs to the field of machinery, and in particular relates to a dynamic pressure cylinder bearing shaft system and a precision machine tool. Background technique [0002] Most of the revolving pairs in the prior art are in a contact state when rotating, and the rotating precision and efficiency are not high. [0003] Bearings that use gas or hydrodynamic technology combined with a cylindrical structure are currently one of the most effective ways to improve the rotation accuracy of the spindle. [0004] According to the basic principle of gas (air) or liquid (oil) dynamic pressure technology, the dynamic pressure technology does not need to supply pressure oil, as long as the required wedge bushing is made in the concave cavity, and there is sufficient gas or liquid medium, After the cylinder rotates, it generates dynamic pressure and floats. The size of the dynamic pressure is related to the following conditions: the smaller the gap b...

Claims

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Application Information

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IPC IPC(8): B23Q1/38B23B19/02
CPCB23Q1/38B23Q1/70
Inventor 黎纯赵思航黎永明
Owner UNIV OF SHANGHAI FOR SCI & TECH