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Throttling air floating bearing and fast shaft servo system based on same

A technology of air bearing and servo system, applied in the direction of air cushion bearing, bearing, shaft and bearing, etc., can solve the problems of reducing the rigidity and accuracy of the fast tool servo device, reducing the processing quality of free-form surface components, and small stroke of the fast tool servo device. Improve throttling effect, ensure high efficiency and high precision, reduce the effect of cutting force disturbance

Pending Publication Date: 2020-05-08
INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese invention patent (application number 201910630709.2) discloses a fast knife servo device driven by piezoelectric ceramics, which uses a two-stage lever amplifying mechanism to amplify the displacement of the tool; driven by piezoelectric ceramics, the stroke of the fast knife servo device is small, and the displacement Although the enlargement mechanism can enlarge the stroke, it will reduce the rigidity and precision of the fast tool servo
Chinese invention patent (application number 201611047489.3) discloses a fast knife servo mechanism driven by a voice coil motor. The pressure bearing adopts the small hole throttling type, and the bearing rigidity is low. Factors such as cutting force disturbance and environmental noise have a great influence on the vibration of the tool, which may reduce the processing quality of free-form surface components.

Method used

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  • Throttling air floating bearing and fast shaft servo system based on same
  • Throttling air floating bearing and fast shaft servo system based on same
  • Throttling air floating bearing and fast shaft servo system based on same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a throttling air bearing, which includes a mutually compatible bearing base 1, and a porous throttling layer 3 is provided on the inner surface of the bearing base 1 for matching with the air bearing guide rail 2; Along the air intake direction, the gas flow resistance of the porous throttle layer 3 gradually increases, and the gas flow resistance can be adjusted by controlling the structural parameters of the porous throttle layer 3 .

Embodiment 2

[0039]To further improve on the basis of Example 1, the following two methods are mainly used to control the gas flow resistance of the porous throttle layer 3: when the inner apertures of the porous throttle layer 3 are the same, in the air intake direction, the porous throttle layer 3 The porosity of the layer 3 decreases gradually; when the porosity of the porous restricting layer 3 is the same, the pore diameter of the porous restricting layer 3 decreases gradually along the air intake direction. The porous throttling layer 3 adopts a porous graphite layer; when in use, a gap of 5 μm to 30 μm, preferably 15 μm to 20 μm, is set between the porous throttling layer 3 and the air bearing guide rail 2 .

[0040] The bearing base 1 is provided with an air inlet 4 and multiple gas passages 5, the multi-channel gas passages 5 are evenly distributed along the axial direction of the bearing base 1, and each gas passage 5 is distributed in a ring along the circumferential direction of...

Embodiment 3

[0042] This embodiment provides a throttling air bearing and a fast-axis servo system based on the bearing, including an air bearing guide 2 , a motor 6 , a tool holder 7 and the throttling air bearing provided in Embodiment 2. The throttling air bearing A is sleeved on the air bearing guide rail 2 and positioned through the installation base 8 . The air bearing guide rail 2 is a cylinder containing four guide rail planes (such as Figure 4 shown), the axial direction contains a through hole, the right end of the air-floating guide rail 2 is provided with a countersunk hole, and the surface of the flange 9 is provided with threaded holes, which are connected with the air-floating guide rail 2 by screws; there is also a sinking hole on the flange 9 The head hole is used to pass through the screw and the heat insulating pad 10 and the voice coil motor 6, the heat insulating pad 10 is located between the voice coil motor 6 and the flange 9, and the voice coil motor 6 is assembled...

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Abstract

The invention discloses a throttling air floating bearing. The throttling air floating bearing comprises bearing pedestals which are matched with each other, wherein a porous throttling layer is arranged on the inner surface of each bearing pedestal which is matched with an air floating guide rail; and the gas circulation resistance of the porous throttling layer is gradually increased in the airinlet direction. The invention further provides the throttling air floating bearing and a fast shaft servo system based on the bearing. The system comprises the air floating guide rail, a motor and aknife rest, wherein the air floating guide rail is sleeved with the throttling air floating bearing, the bearing is positioned through a mounting base; the end of the air floating guide rail is connected with an output end of the motor, and the other end of the air floating guide rail is provided with the knife rest. The throttling air floating bearing has relatively large rigidity, so that the high-frequency response high-precision fast knife servo system with high rigidity and large stroke can be obtained, thereby improving the machining efficiency and precision of the optical element with alarge undulating microstructure or a free curved surface.

Description

technical field [0001] The invention relates to the technical field of optical element processing equipment, in particular to a throttling air bearing and a fast axis servo system based on the bearing. Background technique [0002] In recent years, free-form optical elements have been widely used in various industries such as aerospace, communication, and medical treatment. They are characterized by non-rotational symmetry and complex structures. Therefore, it is important to realize high-efficiency and high-precision processing of free-form optical elements A huge challenge. Traditional processing techniques such as grinding and polishing have the problem of low efficiency. With the development of ultra-precision machining technology, diamond turning technology is widely used in the processing of complex curved surfaces, which has the advantages of low cost and high efficiency. Diamond turning based on fast tool servo technology is one of the most promising free-form optic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C32/06H02K7/08B23Q5/027
CPCF16C32/0603H02K7/08B23Q5/027F16C2380/26F16C2322/39
Inventor 冯艳冰郑越青崔海龙李星占魏巍陈刚利黄小津
Owner INST OF MACHINERY MFG TECH CHINA ACAD OF ENG PHYSICS