CN106424771B - A kind of micro- main shaft of Fine Machinery processing - Google Patents
A kind of micro- main shaft of Fine Machinery processing Download PDFInfo
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- CN106424771B CN106424771B CN201611082459.6A CN201611082459A CN106424771B CN 106424771 B CN106424771 B CN 106424771B CN 201611082459 A CN201611082459 A CN 201611082459A CN 106424771 B CN106424771 B CN 106424771B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/70—Stationary or movable members for carrying working-spindles for attachment of tools or work
Abstract
The invention discloses a kind of micro- main shaft of Fine Machinery processing, turbine 19 is arranged among spindle rotor 16, the high velocity air provided by turbine nozzle 18 drives, spindle rotor 16 uses front end Porous pressurized air journal bearing 13, the radial support of rear end Porous pressurized air journal bearing 4, the rear end of spindle rotor 16 is provided with baffle plate 21, using front end Porous pressurized air thrust bearing 3, the axially supporting of rear end Porous pressurized air thrust bearing 2, rear end bearing supporting member 20, turbine nozzle 18, front end bearing support 17 is sequentially arranged in casing 1, and fixed by installing plate 11, micro- cutter 15 is clamped in the front end of spindle rotor 16 by effect of expanding with heat and contract with cold.It is reasonable in design, the simple in construction, small volume of the present invention, easily manufactured, and rotating speed is high, runout error is small, can be used as micro- main shaft of microcomputer bed for Fine Machinery processing, it can also be used to micro- main shaft of other high speed and super precision micro-electromechanical devices or hand tool etc..
Description
Technical field
The present invention relates to a kind of main shaft, more particularly to a kind of Fine Machinery processing ultrahigh speed precise pneumatic micro spindle,
Belong to machine-building equipment field.
Background technology
The miniaturization of part and the high precision int of size propose higher and higher requirement to its process equipment.Micro- main shaft is made
For the critical component of microcomputer bed, the Fine Machinery process technology such as the performance of microcomputer bed and the fine grinding of micro-cutting is directly determined
Development and application.Existing micro- main shaft is divided into two kinds of micro- electro spindle and micro- pneumatic main shaft, is primarily present following three aspects problem：
First, complicated, volume is largerLimit the miniaturization of microcomputer bed.Meet that microcomputer bed will
Ask,Draw ratio is not more than 3:1；Second, the loss of motor is sent out in by micro- electro spindle
With the frictional heating using rolling bearing or using hole throttle type hydrostatic gas-lubricated bearing rigidity is low etc., problem influences heat, turns
Speed is relatively low (mostly<Below 200000r/min), Fine Machinery processing efficiency and crudy are not only have impact on, and exacerbate micro-
The abrasion of cutter and more slip velocity degree.The fine grinding of micro-cutting with the external diameter of micro- cutter typically several microns to hundreds of microns it
Between, the rotating speed that the micro-cutting speed recommended according to material property can be derived from micro- main shaft should exceed 500000r/min；Three
It is that existing micro- main shaft can be directly delivered to cutter using the micro- cutter of collet clamping, the manufacture alignment error of collet etc.
On, the runout error of cutter is significantly increased.Runout error during such as micro- main shaft ultrahigh speed rotation greatly exceed micro- up to 10 μm
The Fine Machinery processing thickness of meter level.Therefore actual Fine Machinery processing in order to avoid micro- main shaft big runout error often
Micro- speed of mainshaft can be limited.
If only weighed from volume size, micro- main shaft is simply than conventional master spindle small volume.But in fact, with volume
Significantly reduce, the continuous improvement of rotating speed, its thermal deformation, rigidity, frequency, amplitude etc. has very big difference with conventional master spindle.For
This, it is necessary to start with from innovation structure design, develop the micro- main shaft of ultra-speed precise for Fine Machinery processing.And micro- electro spindle
It is complicated, and limited by radiating condition, rotating speed is relatively low；Main shaft is declined due to gas using the air floatation turbine of air stream drives and supporting
The friction factor of body is low, temperature rise is small, flow velocity is high, can reach very high rotating speed, theoretically disclosure satisfy that high speed micro-cutting
Processing request.Inventor herein has designed two new ultrahigh speed precise pneumatic micro spindles (see patent：
ZL201010116981.8, ZL201310157777.4), but volume is larger, rotating speed can't fully meet requirement.Therefore,
Design the new micro- main shaft for being used for Fine Machinery processing, its external structure<Diameter 30mm × long 60mm, maximum speed exceed
400000r/min。
The content of the invention
The technical problems to be solved by the invention are to provide a kind of rotating speed height, runout error is small and simple and compact for structure, makes
Make conveniently, the micro- main shaft of ultra-speed precise for Fine Machinery processing such as minuteness milling, fine drilling, fine grindings.
In order to solve the above problems, the micro- main shaft of Fine Machinery provided by the invention processing, including casing, equal pressing plate, after
End bearing supporting member, turbine nozzle, front end bearing support, spindle rotor, micro- cutter and installing plate, the turbine is directly in institute
To state and be process among spindle rotor, the blade on the turbine is regular cylindrical face shape, and the aperture on face turbine nozzle,
The turbine nozzle is provided with two circle apertures and rotated at a high speed to provide high velocity air drive shaft rotor, the spindle rotor
Front end Porous pressurized air journal bearing, rear end Porous pressurized air journal bearing radial support is respectively adopted in front and back ends
Installation, the spindle rotor rear end are provided with baffle plate, and front end Porous pressurized air thrust is respectively adopted in the baffle plate front and back ends
The axially supporting installation of bearing, rear end Porous pressurized air thrust bearing, the spindle rotor rear end is additionally provided with rear end bearing
To discharge air-flow, the front end Porous pressurized air journal bearing is arranged in the bearing support of front end exhaust duct, described
Front end bearing support is circumferentially evenly equipped with 4 front end air-flow air intake ducts, the rear end Porous pressurized air journal bearing and institute
" L " shape that front end Porous pressurized air thrust bearing is formed integrally is stated, and in rear end bearing supporting member, the rear end
Bearing support is circumferentially evenly equipped with 4 rear end air-flow air intake ducts, and the rear end Porous pressurized air thrust bearing is by pressing
Plate provides air-flow, and pressing plate, the rear end Porous pressurized air thrust bearing are sequentially arranged at box back, the rear axle
Hold supporting member, turbine nozzle, front end bearing support to be sequentially arranged in casing, and be fixedly mounted by installing plate, screw, institute
State casing and be provided with rear end Porous pressurized air thrust bearing air supply opening and corresponding thrust bearing air intake duct, thrust bearing row
Air flue, thrust bearing exhaust outlet, rear end Porous hydrostatic gas-lubricated bearing air supply opening, turbine rear end exhaust outlet, nozzle air supply opening, whirlpool
Front end exhaust outlet is taken turns, front end Porous pressurized air journal bearing air supply opening, is provided with axle at the axis of the spindle rotor front end
Xiang Kong, micro- cutter or other microactuators such as micro- milling cutter, micro drill, micro- frotton are clamped by effect of expanding with heat and contract with cold, and axially
Hole depth is more than micro- knife handle length, so as to can adjust micro- cutter cantilevered length.
The turbine nozzle is not limited to set two circle apertures, can set single-turn or multi-turn according to output speed, torque request
Aperture.
The front end bearing support is not limited to uniform 4 front ends air-flow air intake duct, and the rear end bearing supporting member is unlimited
In uniform 4 rear ends air-flow air intake duct, the pressing plate is also not necessarily limited to uniform 4 balancing orifices, can be uniformly arranged it as needed
The air intake duct or balancing orifice of its quantity.
Using the micro- main shaft of Fine Machinery processing of above-mentioned technical proposal, the high velocity air provided by turbine nozzle impacts whirlpool
Wheel drive spindle rotor rotates at a high speed, realizes micro- main shaft ultrahigh rotating speed performance；It is quiet that Porous is respectively adopted in spindle rotor front and back ends
Gas lubricated journal bearing supporting positioning is pressed, spindle rotor rear end is provided with baffle plate, and Porous static pressure gas is respectively adopted in baffle plate front and back ends
The supporting positioning of body thrust bearing, realize the ultra-precise revolving of micro- main shaft；Axial hole is provided with the axis of spindle rotor front end, is passed through
Effect of expanding with heat and contract with cold clamps micro- cutter.
Using the Fine Machinery processing of above-mentioned technical proposal with micro- main shaft, its advantage and good effect compared with prior art
It is significant, major embodiment is in the following areas：
1. the nozzle arrangements of liang circle or multi-turn aperture.In the pneumatic microturbines of impact type, in order to obtain ultrahigh rotating speed, nozzle
In orifice size it is typically small.But orifice size is smaller, its impact forces is with regard to smaller.It is if small using conventional individual pen
Hole arrangement, limited by micro- main axle structure size, its limited amount, thus cause torque caused by microturbines and power compared with
It is small, it is difficult to meet Fine Machinery processing request.And set up two circles or multi-turn aperture the week of face turbo blade in nozzle,
Can be multiplied nozzle orifice quantity, can not only realize the ultrahigh rotating speed performance of pneumatic microturbines, and can effectively lift its turn
Square and power.
2. the integral structure of spindle rotor and turbine.After supporting rotor and turbine are much processing in existing rotating machinery
It is assembled together, the manufacture installation equal error of turbine can be directly delivered on supporting rotor, exacerbate the imbalance of rotor.Especially
It is the micro- main shaft of ultra-speed precise, the amount of unbalance of very little is possible to cause very big runout error under macro-scale.It is and existing
Dynamic balancing technique can not also solve the dynamic balance calibration that grade rotor hundreds of thousands turns, therefore machining accuracy can only be relied on to protect
Card.And spindle rotor is formed integrally by the technical program with turbine, the alignment error of turbine, and the leaf on turbine not only avoid
Piece is regular cylindrical face shape, and machining accuracy easily ensures, therefore balance quality is good, so as to be advantageous to micro- speed of mainshaft and rotating accuracy
Raising.
3. microminiature Porous hydrostatic gas-lubricated bearing supporting structure.The micro- main shaft of ultra-speed precise is by physical dimension and small zero
Part processing conditions limits, and is mainly supported at present using rolling bearing and hole throttle type hydrostatic gas-lubricated bearing.Rolling bearing is at a high speed
Temperature rise during operation is higher, need to set cooling system, and this just makes micro- main axle structure complicated.Hole throttle type hydrostatic gas-lubricated bearing is held
Carry that small, rigidity is low, cause the bounce of main shaft constantly to aggravate with the raising of rotating speed.The technical program uses microminiature Porous
Hydrostatic gas-lubricated bearing supports, and not only avoid problem of temperature rise, and bearing capacity and stiffness is all lifted, and ensure that micro- main shaft superelevation
High rotating accuracy under rotating speed.
4. the method for clamping that expands with heat and contract with cold of micro- cutter.Existing micro- main shaft clamps micro- cutter, bullet frequently with small collet
The manufacture alignment error of spring chuck can be not only directly delivered on micro- cutter, cause the runout error of micro- cutter to increase, and
The amount of unbalance of spindle rotor is increased, influences the rotating speed of micro- main shaft.And the technical program is set at the axis of spindle rotor front end
Axial hole is equipped with, micro- cutter is clamped by effect of expanding with heat and contract with cold, i.e., the clamping of cutter and replacing are realized by the change of temperature
It is required that with the amount of unbalance that this is avoided the manufacture alignment error of collet and its brought into, so as to be advantageous to micro- main shaft gyration essence
The raising of degree and its rotating speed.
5. micro- cutter cantilevered length adjustable structure.Axial hole depth at the axis of spindle rotor front end is more than micro- cutter knife
Handle length, not only micro- cutter cantilevered length can be adjusted according to processing request, to meet the processing request in larger size range, more
It is important that before and after the baffle plate coordination guarantee spindle rotor that can be set by adjusting micro- cutter cantilevered length with spindle rotor rear end
Mass balance is held, reduces the runout error of spindle rotor.
6. spindle rotor is simple in construction and symmetrical.Turbo blade on spindle rotor is the regular cylindrical of even number,
The axial hole that the baffle plate and front end that spindle rotor rear end is set are set all is cylinder or columnar structured, it is seen that whole spindle rotor
Structure is very simple and symmetrical, and machining accuracy is easily guaranteed that, that is to say, that easily ensures spindle rotor by fabricating precision
Amount of unbalance, so as to be advantageously implemented the ultrahigh rotating speed of micro- main shaft and low runout error performance.
In summary, the present invention reasonable, simple in construction, small volume novel in design (<Diameter 30mm × long 45mm), manufacturer
Just, the product requirement of the marketization is met, and rotating speed is high, runout error is small, particularly suitable for the fine of ultraprecise micro parts
Milling, fine drilling, it is fine grinding etc. Fine Machinery processing, can as microcomputer bed micro- main shaft and it is other make high speed and ultrahigh speed,
The electromechanical equipment of high-precision rotary motion or micro- main shaft of hand tool.
Brief description of the drawings
Fig. 1 is the main sectional view of the embodiment of the present invention.
Fig. 2 is Fig. 1 of the present invention A-A sectional views (i.e. the equal pressure passageway of rear end Porous pressurized air thrust bearing air inlet).
Fig. 3 is Fig. 1 of the present invention B-B sectional views (i.e. Porous pressurized air thrust bearing exhaust passage).
Fig. 4 is Fig. 1 of the present invention C-C sectional views (i.e. rear end Porous pressurized air journal bearing inlet channel).
Fig. 5 is Fig. 1 of the present invention D-D sectional views (i.e. turbine rear end exhaust passage).
Fig. 6 is Fig. 1 of the present invention E-E sectional views (i.e. turbine inflow passages).
Fig. 7 is Fig. 1 of the present invention F-F sectional views (i.e. turbine front end exhaust passage).
Fig. 8 is Fig. 1 of the present invention G-G sectional views (i.e. spindle rotor rear end bearing exhaust duct)
In accompanying drawing 1-8：1-casing, 2-rear end Porous pressurized air thrust bearing, 3-front end Porous pressurized air
Thrust bearing, 4-rear end Porous pressurized air journal bearing, 5-rear end air-flow air intake duct, 6-rear end Porous static pressure gas
Body bearing air supply opening, 7-aperture, 8-nozzle air supply opening, 9-front end Porous pressurized air journal bearing air supply opening, 10-preceding
End air-flow air intake duct, 11-installing plate, 12-screw, 13-front end Porous pressurized air journal bearing, 14-axial hole,
15-micro- cutter, 16-spindle rotor, 17-front end bearing support, 18-turbine nozzle, 19-turbine, 20-rear end bearing
Supporting member, 21-baffle plate, 22-rear end Porous pressurized air thrust bearing air supply opening, 23-thrust bearing exhaust outlet, 24-
Turbine rear end exhaust outlet, 25-turbine rear end exhaust duct, 26-turbine front end exhaust outlet, 27-turbine front end exhaust duct, 28-
Thrust bearing air intake duct, 29-blade, 30-equal pressing plate, 31-balancing orifice, 32-thrust bearing exhaust duct, 33-rear end bearing
Exhaust duct.
Embodiment
The present invention is elaborated with reference to embodiment and accompanying drawing.
Referring to accompanying drawing 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 8, the turbine 19 is directly in the spindle rotor 16
Centre is process, i.e., turbine 19 is formed integrally with spindle rotor 16, avoids the alignment error of turbine 16, on the turbine 19
Blade 29 be regular cylindrical face shape, and the aperture 7 on face turbine nozzle 18, the turbine nozzle 18 are provided with two circle apertures
7 are rotated at a high speed to provide high velocity air drive shaft rotor 16, i.e., the ultrahigh speed for realizing micro- main shaft using pneumatic microturbines is returned
Turn, front end Porous pressurized air journal bearing 13, rear end Porous static pressure gas is respectively adopted in the front and back ends of spindle rotor 16
The radial support of body journal bearing 4, the rear end of spindle rotor 16 are provided with baffle plate 21, and the front and back ends of baffle plate 21 are respectively adopted
Front end Porous pressurized air thrust bearing 3, rear end Porous pressurized air thrust bearing 2 axially supporting, i.e., using Porous
Hydrostatic gas-lubricated bearing realizes the ultra-precise revolving of micro- main shaft, and the rear end of spindle rotor 16 is additionally provided with rear end bearing exhaust duct 33
To discharge air-flow, the front end Porous pressurized air journal bearing 13 is arranged in front end bearing support 17, before described
End bearing supporting member 17 is circumferential to be evenly equipped with 4 front end air-flow air intake ducts 10, the rear end Porous pressurized air journal bearing 4 with
" L " shape that the front end Porous pressurized air thrust bearing 3 is formed integrally, and in rear end bearing supporting member 20, institute
State rear end bearing supporting member 20 and be circumferentially evenly equipped with 4 rear end air-flow air intake ducts 5, the rear end Porous pressurized air thrust bearing
2 provide air-flow by equal pressing plate 30, and pressing plate 30, the rear end Porous pressurized air thrust bearing 2 are sequentially arranged at casing 1
Rear end, the rear end bearing supporting member 20, turbine nozzle 18, front end bearing support 17 are sequentially arranged in casing 1, and passed through
Installing plate 11, screw 12 are fixedly mounted, it is seen that entirely the number of parts of micro- main shaft is few, simple in construction, processing cost is low, is advantageous to
Product the marketization requirement, the casing 1 be provided with rear end Porous pressurized air thrust bearing air supply opening 22 and it is corresponding only
Thrust bearing air intake duct 28, thrust bearing exhaust duct 32, thrust bearing exhaust outlet 23, rear end Porous hydrostatic gas-lubricated bearing air supply opening
6th, turbine rear end exhaust outlet 24, nozzle air supply opening 8, turbine front end exhaust outlet 26, front end Porous pressurized air journal bearing supply
Gas port 9, axial hole 14 is provided with the front end axis of spindle rotor 16, pass through effect of expanding with heat and contract with cold and clamp micro- milling cutter, micro- brill
Micro- cutter 15 or other microactuators such as head, micro- frotton, avoid the manufacture alignment error using collet, and axial hole
14 depth are more than micro- shank length of cutter 15, so as to can adjust micro- cantilevered length of cutter 15, can not only realize larger size range
Fine Machinery processing, it is often more important that can with the rear end of spindle rotor 16 set baffle plate 21 coordinate ensure spindle rotor 16 before and after
Mass balance is held, reduces the runout error of spindle rotor 16, lifts the rotating accuracy of micro- cutter 15.
Referring to accompanying drawing 1 and Fig. 6, the turbine nozzle 18 is not limited to set two circle apertures 7, and more the aperture of small size is certain
Scope interior energy provides the air-flow of more speed, but active force is small, thus can be set according to output speed, torque request individual pen or
Multi-turn aperture 7, i.e., while 19 ultrahigh rotating speed of turbine is realized, also to ensure output torque, to meet that Fine Machinery processing will
Ask.
Referring to accompanying drawing 1 and Fig. 4, the front end bearing support 17 is not limited to uniform 4 front ends air-flow air intake duct 10, described
Rear end bearing supporting member 20 is also not necessarily limited to uniform 4 rear ends air-flow air intake duct 5, and the pressing plate 30 is also not necessarily limited to uniform 4
Hole 31 is pressed, the air intake duct or balancing orifice of other quantity can be arranged as required to, but need to circumferentially be uniformly arranged, it is therefore an objective to reduce superelevation
Influence of the fast airflow asymmetry impact to porous bearings deformation, and then ensure the high rotating accuracy of spindle rotor.
The operation principle of the present invention is briefly described as below：Source of the gas enters in turbine nozzle 18 through two nozzle air supply openings 8, is passed through after
Aperture 7 forms ultrahigh speed air-flow, the blade 29 acted on turbine 19, promotes spindle rotor 16 to rotate, the air-flow thereafter let out
A part is through turbine front end exhaust duct 27, turbine front end exhaust outlet 26, and another part is through turbine rear end exhaust duct 25, turbine rear end
Exhaust outlet 24 is discharged, so as to realize the ultrahigh speed rotation performance of micro- main shaft；The radial support of the front end of spindle rotor 16 is in source of the gas
Enter through front end Porous pressurized air journal bearing air supply opening 9 in front end bearing support 17, then through front end air-flow air inlet
Road 10 is flowed into front end Porous pressurized air journal bearing 13, passes through the rear portion air-flow of hydrostatic pressure supporting spindle rotor 16
It is expelled directly out, another part air-flow is discharged through turbine front end exhaust duct 27, turbine front end exhaust outlet 26, the rear end of spindle rotor 16
Radial support is to enter in source of the gas through rear end Porous hydrostatic gas-lubricated bearing air supply opening 6 in rear end bearing supporting member 20, is passed through after
Rear end air-flow air intake duct 5 enters in rear end Porous pressurized air journal bearing 4, after hydrostatic pressure supporting spindle rotor 16
A part of air-flow is discharged through turbine rear end exhaust duct 25, turbine rear end exhaust outlet 24, and another part air-flow is vented through rear end bearing
Road 33, thrust bearing exhaust duct 32 are discharged, so as to realize the radial support positioning to spindle rotor 16；The axial direction of spindle rotor 16
Supporting is realized by the baffle plate 21 of setting, specifically can enter gear into a part of air-flow in rear end bearing supporting member 20
In the front end Porous pressurized air thrust bearing 3 of plate 21, pass through the rear portion of baffle plate 21 of hydrostatic pressure supporting spindle rotor 16
Flowed out through thrust bearing exhaust outlet 23, another part is discharged through rear end bearing exhaust duct 33, thrust bearing exhaust duct 32, baffle plate 21
The supporting of rear end is pressed from rear end Porous pressurized air thrust bearing air supply opening 22, thrust bearing air intake duct 28 in source of the gas
After balancing orifice 31 on plate 30, into rear end Porous pressurized air thrust bearing 2, pass through hydrostatic pressure supporting spindle rotor
After 16 baffle plate 21, a part of air-flow is discharged through thrust bearing exhaust outlet 23, and another part air-flow is through thrust bearing exhaust duct 32
Discharge, so as to realize the axial direction supporting positioning to spindle rotor 16, supported using Porous hydrostatic gas-lubricated bearing, not only can be effective
Reduce using frictional power loss during rolling bearing supporting, and compare hole throttle type hydrostatic gas-lubricated bearing, bearing capacity is more
It is high, rigidity is bigger, therefore big runout error when can effectively solve the problems, such as micro- main shaft ultrahigh speed rotation；Micro- cutter 15 passes through heat expansion
Shrinkage effect is clamped in the axial hole 14 of spindle rotor 16, avoids the manufacture alignment error using collet, Er Qieyou
It is more than the length of micro- handle of a knife of cutter 15 in the depth of axial hole 14, therefore can adjust the cantilevered length of micro- cutter 15, so not only
The processing request in larger size range can be met, it is often more important that the baffle plate 21 that can be set with the rear end of spindle rotor 16 coordinates reality
The fine balance requirement of the existing front and back end of spindle rotor 16, it is very beneficial for the realization of micro- main shaft ultra-precise revolving requirement.
Claims (3)
1. a kind of Fine Machinery processing micro- main shaft, including casing (1), equal pressing plate (30), rear end bearing supporting member (20), turbine
Nozzle (18), front end bearing support (17), spindle rotor (16), micro- cutter (15) and installing plate (11), it is characterized in that：It is described
Turbine (19) is directly process among the spindle rotor (16), and the blade (29) on the turbine (19) is regular cylindrical
Face shape, and the aperture (7) on face turbine nozzle (18), the turbine nozzle (18) are provided with two circle apertures (7) to provide
High velocity air drive shaft rotor (16) rotates at a high speed, and it is quiet that front end Porous is respectively adopted in spindle rotor (16) front and back ends
Press gas lubricated journal bearing (13), the installation of rear end Porous pressurized air journal bearing (4) radial support, the spindle rotor (16)
Rear end is provided with baffle plate (21), baffle plate (21) front and back ends be respectively adopted front end Porous pressurized air thrust bearing (3),
Rear end Porous pressurized air thrust bearing (2) axially supporting installation, spindle rotor (16) rear end is additionally provided with rear axle
Exhaust duct (33) is held to discharge air-flow, the front end Porous pressurized air journal bearing (13) supports installed in preceding end bearing
In part (17), the front end bearing support (17) is circumferentially evenly equipped with (4) individual front end air-flow air intake duct (10), and the rear end is porous
" L " shape that matter pressurized air journal bearing (4) is formed integrally with the front end Porous pressurized air thrust bearing (3), and pacify
In rear end bearing supporting member (20), the rear end bearing supporting member (20) is circumferentially evenly equipped with (4) individual rear end air-flow air intake duct
(5), the rear end Porous pressurized air thrust bearing (2) by equal pressing plate (30) provide air-flow, it is described pressing plate (30), after
End Porous pressurized air thrust bearing (2) is sequentially arranged at casing (1) rear end, the rear end bearing supporting member (20), turbine
Nozzle (18), front end bearing support (17) are sequentially arranged in casing (1), and fixed by installing plate (11), screw (12)
Installation, the casing (1) is provided with rear end Porous pressurized air thrust bearing air supply opening (22) and corresponding thrust bearing enters
Air flue (28), thrust bearing exhaust duct (32), thrust bearing exhaust outlet (23), rear end Porous hydrostatic gas-lubricated bearing air supply opening
(6), turbine rear end exhaust outlet (24), nozzle air supply opening (8), turbine front end exhaust outlet (26), front end Porous pressurized air footpath
To bearing air supply opening (9), axial hole (14) is provided with the axis of spindle rotor (16) front end, effect is pressed from both sides by expanding with heat and contract with cold
Micro- cutter (15) or other microactuators are held, and axial hole (14) depth is more than micro- cutter (15) shank length, so as to adjustable
Save the cantilevered length of micro- cutter (15).
2. a kind of micro- main shaft of Fine Machinery processing according to claim 1, it is characterized in that：The turbine nozzle (18) is no
It is limited to set two circle apertures (7), single-turn or multi-turn aperture (7) can be set according to output speed, torque request.
A kind of 3. micro- main shaft of Fine Machinery processing according to claim 2, it is characterized in that the front end bearing support
(17) uniform 4 front ends air-flow air intake duct (10) is not limited to, the rear end bearing supporting member (20) is not limited to uniform 4 rear end gas
Flow inlet port (5), the pressing plate (30) are also not necessarily limited to uniform 4 balancing orifices (31), can be uniformly arranged other numbers as needed
The air intake duct or balancing orifice of amount.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611082459.6A CN106424771B (en) | 2016-11-30 | 2016-11-30 | A kind of micro- main shaft of Fine Machinery processing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611082459.6A CN106424771B (en) | 2016-11-30 | 2016-11-30 | A kind of micro- main shaft of Fine Machinery processing |
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| CN106424771A CN106424771A (en) | 2017-02-22 |
| CN106424771B true CN106424771B (en) | 2018-03-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107322013A (en) * | 2017-08-29 | 2017-11-07 | 孙嘉骏 | The noncontact driven using air motor supports rotary main shaft device |
| CN108188417B (en) * | 2018-02-06 | 2024-03-08 | 中国计量大学 | Multiple throttling type static pressure air floatation motorized spindle and application method thereof |
| CN114542324A (en) * | 2022-02-28 | 2022-05-27 | 北京盈天航空动力科技有限公司 | Porous two-phase bearing of micro turbojet engine and rotor supporting structure thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2294801Y (en) * | 1997-09-23 | 1998-10-21 | 史景璋 | High-precision high-speed drilling-cutting pneumatic master shaft |
| CN2500430Y (en) * | 2001-10-11 | 2002-07-17 | 蔡贵钧 | High speed pneumatic main axle head |
| JP4667816B2 (en) * | 2004-10-01 | 2011-04-13 | Ｎｔｎ株式会社 | Air turbine spindle device |
| CN201618856U (en) * | 2010-03-03 | 2010-11-03 | 湖南大学 | Ultra-high-speed precise pneumatic micro-spindle |
| CN101774031B (en) * | 2010-03-03 | 2011-11-30 | 湖南大学 | Ultrahigh speed precise pneumatic micro spindle unit |
| CN103302316B (en) * | 2013-04-28 | 2015-09-23 | 湖南大学 | High speed and precision pneumatic micro spindle |
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