CN106623994A - Machine tool spindle system provided with pretightening force adjusting device - Google Patents
Machine tool spindle system provided with pretightening force adjusting device Download PDFInfo
- Publication number
- CN106623994A CN106623994A CN201710099129.6A CN201710099129A CN106623994A CN 106623994 A CN106623994 A CN 106623994A CN 201710099129 A CN201710099129 A CN 201710099129A CN 106623994 A CN106623994 A CN 106623994A
- Authority
- CN
- China
- Prior art keywords
- ball bearing
- outer ring
- coolant jacket
- bearing
- tool spindle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002826 coolant Substances 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 6
- 230000001737 promoting effect Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims 1
- 125000006850 spacer group Chemical group 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract 4
- 238000010586 diagram Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- 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 provides a machine tool spindle system provided with a pretightening force adjusting device. The machine tool spindle system comprises a spindle, a first ball bearing and a second ball bearing which sheath the spindle at intervals, an inner spacer bush, a cooling jacket, a piston element and a pressure measuring element, wherein the inner spacer bush sheathes the spindle and is arranged between the first ball bearing and the second ball bearing, and the two ends of the inner spacer bush respectively prop against the inner ring of the first ball bearing and the inner ring of the second ball bearing; the cooling jacket surrounds the spindle and is in respectively fit with the outer ring of the first ball bearing and the outer ring of the second ball bearing; the piston element is arranged on the cooling jacket and used for pushing the outer ring of the first ball bearing to move axially; and the pressure measuring element is arranged on the cooling jacket and used for acquiring a load born by the outer ring of the second ball bearing. The machine tool spindle system provided by the invention has the advantages that other spindle parts and structures do not need to be changed and the machine tool spindle system can be applicable to any bearing configuration way.
Description
Technical field
The present invention relates to digit ctrol machine tool field, the more particularly to machine-tool spindle system with pre-tightening force adjusting device.
Background technology
The size of main shaft of numerical control machine tool bearing pre-fastening has a major impact to high-speed machine tool main shaft dynamic characteristic.Current main shaft
Pre-tension method mainly has positioning pretension and level pressure pretension, and the size of its pretightning force is to take into account low speed high torque and high-speed high-power two
Aspect factor and comprehensive determine.For low speed segment, pretightning force is less than normal, system attack forced vibration and self-excited vibration ability compared with
Weak, the chatter mark for often showing to be remained on the machined surface of workpiece is more apparent.It is again bigger than normal for high regime, pretightning force, cause
Bearing Temperature, shortens the service life of bearing, reduces spindle rotation accuracy.Therefore, if the pretightning force of main shaft bearing
Can change with the change of the speed of mainshaft, not only be expected the dynamic performance for obtaining high-quality, but also can significantly extending shaft
Hold the life-span.
German GMN companies as shown in Figure 1 use main shaft bearing pretightning force mechanism for testing, and its front and back bearings is using overall
" back-to-back " form, the design between rear end bearing and bearing block one is helped pull a cart, this help pull a cart respectively with bearing outer ring and bearing block in
Circle coordinates.Pressure oil is passed through in the closed cavity helped pull a cart and bearing block between, promotion is helped pull a cart and then pulls bearing outer ring, makes axle
There is relative displacement between the inside and outside circle for holding, and then adjust pretightning force.The shortcoming of the mechanism for testing is due to main shaft prefastening load
Be divided into underloading, middle load and heavily loaded several operating modes, its prefastening load within 0～2500N, required hydraulic pressure 0～1MPa it
Between, the interval is in the inelastic region of hydraulic valve so that the pretightning force for being adjusted is difficult to control to and measures, also cannot be accurate
Really adjust for the pretightning force of main shaft.
The pretightning force control structure of Zhejiang University Jiang Chun inventions as shown in Figure 2, it is a hollow closed annular structure
Part, annulus both ends of the surface are welded with metallic elastic film, hydraulically full plastics in cavity, promote elastic film expansion or shrinkage, right
Bearing outer ring can apply different pretightning forces.The shortcoming of the control structure is to need to punch bearing holder (housing, cover), so if bearing
When set outside is provided with complex partses, then need to make the structure of whole main shaft very big change.
The content of the invention
In view of problems of the prior art, a kind of machine tool chief axis system with pre-tightening force adjusting device of present invention offer
System includes：
Main shaft；
Compartment of terrain is sheathed on the first ball bearing and the second ball bearing on the main shaft；
It is sheathed on the main shaft and the inner spacing collar between first ball bearing and second ball bearing,
The two ends of the inner spacing collar are contradicted respectively on the inner ring of first ball bearing and the inner ring of second ball bearing；
Paste around the main shaft and with the outer ring of the outer ring of first ball bearing and second ball bearing
The coolant jacket of conjunction；
The piston element for promoting the outer ring axially-movable of first ball bearing being arranged on the coolant jacket；
Bear the pressure of load and survey in the outer ring for obtaining second ball bearing being arranged on the coolant jacket
Determine element.
In certain embodiments of the present invention, the coolant jacket is located at first ball bearing and second ball
Part between bearing has the inside section that narrows, and between the outer ring for narrowing section and first ball bearing first is formed
Gap, between the outer ring for narrowing section and second ball bearing the second gap is formed；The piston element is arranged at institute
State on coolant jacket and in first gap；The piezometry element is arranged on the coolant jacket and positioned at described
In two gaps.
In certain embodiments of the present invention, the described machine-tool spindle system with pre-tightening force adjusting device is also wrapped
Include：
Air pressure unit；
Gas-liquid converting unit, can be converted into hydraulic pressure by the output pressure of institute's air pressure unit, and with described in the hydraulic control
Piston element is moved；
Control unit, prestores the optimal prefastening load numerical value that the speed of mainshaft matches, and it can compare piezometry unit
Load value and prefastening load numerical value that part is obtained, and send output control signal to air pressure unit.
The machine-tool spindle system with pre-tightening force adjusting device that the present invention is provided is by by the first ball bearing and piston
Element is contacted, the second ball bearing, pressure measuring element and coolant jacket positioning, by the first ball bearing of hydraulic drive outer ring,
Then the load is conducted to the outer ring of the second ball bearing, and is obtained by piezometry element.Control unit is according to acquisition
Load value, it is contrasted with default load value, then further piston adjusted by air pressure unit and gas-liquid converting unit
The position of element, change puts on the load of the first ball bearing outer ring, and then realizes according to the different speed of mainshaft to main shaft
Bearing carries out pretension.
The present invention more easily can transform existing axis system as machine tool chief axis with pre-tightening force adjusting device
System, except coolant jacket and piston element need processing in addition, to other spindle units and structure need not other changes may be made,
And for arbitrary bearing configuration mode, such as " back-to-back ", " face-to-face ", " series connection ", the present invention can be carried out to it
Prefastening load is measured and controlled.
Description of the drawings
Fig. 1 is the schematic diagram of main shaft bearing pretightning force mechanism for testing in prior art；
Fig. 2 is the schematic diagram of pretightning force control structure in prior art；
The structural representation of the machine-tool spindle system with pre-tightening force adjusting device that Fig. 3 is provided for invention；
Fig. 4 is the schematic diagram of control unit of the present invention.
Specific embodiment
In order that the purpose of invention, technical scheme and advantage are clearer, below in conjunction with the accompanying drawings with specific embodiment to sending out
It is bright to be described in further detail.Although showing disclosure exemplary embodiment in accompanying drawing, it being understood, however, that can be with each
The form of kind is realized the present invention and should not be limited by embodiments set forth here.On the contrary, there is provided these embodiments are able to
More thorough explanation the present invention, and can by the scope of the present invention it is complete convey to those skilled in the art.
With reference to Fig. 3, the machine-tool spindle system with pre-tightening force adjusting device that an embodiment of the present invention is provided includes master
Axle 1, the first ball bearing 2 and the second ball bearing 3, inner spacing collar 4, coolant jacket 5, piston element 6 and piezometry element 7.
The axis system is symmetrical with the center line of main shaft 1, therefore Fig. 3 only shows the structural representation of the system top half.
First ball bearing 2 and the compartment of terrain of the second ball bearing 3 are sheathed on main shaft 1.Inner spacing collar 4 is sheathed on main shaft 1
And between the first ball bearing 2 and second ball bearing 3, the two ends of inner spacing collar 4 are contradicted respectively in the first ball axle
Hold on 2 inner ring and the inner ring of second ball bearing 3.Coolant jacket 5 surround main shaft 1 and its inner headed face and the first ball bearing
Fit the outer ring of 2 outer ring and the second ball bearing 3.Piston element 6 is arranged on coolant jacket 5, and it can be micro-
Move in the range of laughing at, to promote the outer ring axially-movable of first ball bearing 2.Piezometry element 7 is arranged at coolant jacket 5
Bear load in outer ring upper and that the second ball bearing 2 can be obtained.
In certain embodiments of the present invention, coolant jacket 5 is located between the first ball bearing 2 and the second ball bearing 3
Part have it is inside narrow section, this to narrow and form the first gap between the outer ring of section and the first ball bearing 2, and this narrows section
And second ball bearing 3 outer ring between form the second gap.Piston element 6 is arranged on coolant jacket 5 and positioned at the first gap
In.Piezometry element 7 is arranged on coolant jacket 5 and in the second gap.
The schematic diagram for control unit of the present invention with reference to shown in Fig. 4, piston element 6 coordinates with coolant jacket 5, and it passes through gas
The input hydraulic pressure of liquid converting unit 8 oil.The two ends of piston element 6 are equipped with sealing ring, for hydraulic oil seal.First ball bearing 2
Inner ring be fixed on main shaft 1 by locking nut 9.
When using, piston element 6 moves right and promotes the outer ring of the first ball bearing 2 to move right, the first ball bearing 2
Outer ring produce load by the ball of itself, bearing inner race, inner spacing collar 4, the second ball bearing 3 inner ring, ball, bearing
Outer ring, most at last prefastening load acts on piezometry element 7.Piezometry element 7 by surveyed load it is amplified, filtering, A/D
Conversion input control unit.When the fine motion to the right of piston element 6, then can promote the outer ring of the first ball bearing 2 that fine motion occurs, make bearing
Relative displacement is produced between outer ring and cone spacer, increases pretightning force.When the fine motion to the left of piston element 6, then due to the first ball axle
The ball for holding 2 is in elastic deformation scope, and ball expansion, bearing outer ring also can therewith occur fine motion, produces inside and outside circle relative
Displacement, reduces pretightning force.
Control unit surveys the current rotating speed that load carries out being prestored in data processing, with database to piezometry element 7
In the range of optimal prefastening load numerical value be compared after, output adjustment signal is converted into corresponding control voltage through D/A
Value, the pneumatic pressure-release valve of input air pressure unit, Pneumatic decompression valve regulation enters the pressure of gas-liquid converting unit, and gas-liquid conversion is single
Atmospheric pressure is converted to hydraulic pressure and input hydraulic pressure oil pocket by unit, makes the fine motion to the right of piston element 6 or fine motion to the left, so that
The outer ring of first ball bearing 2 produces certain relative displacement, and then the optimal pretension amount needed for obtaining relative to the inner ring of itself.
Finally it should be noted that above example is only to illustrate technical scheme and nonrestrictive.Although
The present invention is described in detail with reference to embodiment, it should be appreciated by those of ordinary skill in the art that the skill to the present invention
Art scheme is modified or equivalent, and without departure from the spirit and scope of technical solution of the present invention, it all should cover at this
In the middle of the right of invention.
Claims (3)
1. the machine-tool spindle system of pre-tightening force adjusting device is carried, it is characterised in that included：
Main shaft；
Compartment of terrain is sheathed on the first ball bearing and the second ball bearing on the main shaft；
It is sheathed on the main shaft and the inner spacing collar between first ball bearing and second ball bearing, it is described
The two ends of inner spacing collar are contradicted respectively on the inner ring of first ball bearing and the inner ring of second ball bearing；
Fit around the main shaft and with the outer ring of the outer ring of first ball bearing and second ball bearing
Coolant jacket；
The piston element for promoting the outer ring axially-movable of first ball bearing being arranged on the coolant jacket；
Bear the piezometry unit of load in the outer ring for obtaining second ball bearing being arranged on the coolant jacket
Part.
2. the machine-tool spindle system with pre-tightening force adjusting device according to claim 1, it is characterised in that：
The part that the coolant jacket is located between first ball bearing and second ball bearing has inside narrowing
Section, forms the first gap between the outer ring for narrowing section and first ball bearing, described to narrow section and second rolling
The second gap is formed between the outer ring of pearl bearing；
The piston element is arranged on the coolant jacket and in first gap；
The piezometry element is arranged on the coolant jacket and in second gap.
3. the machine-tool spindle system with pre-tightening force adjusting device according to claim 2, it is characterised in that also include：
Air pressure unit；
Gas-liquid converting unit, can be converted into hydraulic pressure by the output pressure of institute's air pressure unit, and with piston described in the hydraulic control
Member motion；
Control unit, prestores the optimal prefastening load numerical value that the speed of mainshaft matches, and it can compare piezometry element and obtain
The load value for taking and prefastening load numerical value, and send output control signal to air pressure unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710099129.6A CN106623994B (en) | 2017-02-23 | 2017-02-23 | Machine-tool spindle system with pre-tightening force adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710099129.6A CN106623994B (en) | 2017-02-23 | 2017-02-23 | Machine-tool spindle system with pre-tightening force adjusting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106623994A true CN106623994A (en) | 2017-05-10 |
| CN106623994B CN106623994B (en) | 2018-05-22 |
Family
ID=58844810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710099129.6A Active CN106623994B (en) | 2017-02-23 | 2017-02-23 | Machine-tool spindle system with pre-tightening force adjusting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106623994B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110653382A (en) * | 2019-10-16 | 2020-01-07 | 德州普利森机床有限公司 | Bearing pre-tightening method for spindle of large-through-hole headstock |
| CN112524152A (en) * | 2019-09-17 | 2021-03-19 | 福建金风科技有限公司 | Bearing clearance adjusting device and method and wind generating set |
| CN113059201A (en) * | 2021-04-16 | 2021-07-02 | 哈尔滨理工大学 | High-speed electric spindle |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2056774A (en) * | 1935-03-20 | 1936-10-06 | Nat Acme Co | Spindle bearing for automatic machines |
| CN1003090B (en) * | 1987-08-05 | 1989-01-18 | 浙江大学 | Pretightening force cotroller of rolling bearing |
| CN102310203B (en) * | 2011-06-20 | 2012-07-04 | 西安交通大学 | High-speed main shaft with controllable non-uniformly distributed pre-tightening force and control method thereof based on regulation and control of hydraulic system |
| CN102278379B (en) * | 2011-06-20 | 2012-07-04 | 西安交通大学 | Non-uniform-distribution pretightening-force-controllable high-speed main shaft based on piezoelectric actuator and control method thereof |
| CN102528560B (en) * | 2011-12-22 | 2014-06-04 | 西安交通大学 | Method for measuring static pre-tightening force of main shaft bearing of machine tool |
| CN102637017B (en) * | 2012-04-27 | 2013-08-14 | 西安交通大学 | Real-time monitoring device and method for spindle performance and calibrating experimental device and method thereof |
| CN202648921U (en) * | 2012-04-27 | 2013-01-02 | 西安交通大学 | Main shaft preloading force dynamic adjustment experiment table based on piezoelectric actuators |
| CN203459999U (en) * | 2013-09-11 | 2014-03-05 | 华中科技大学 | Digital pretightening force detecting device for numerical control machine tool feed system |
| CN206567541U (en) * | 2017-02-23 | 2017-10-20 | 沈机集团昆明机床股份有限公司 | Machine-tool spindle system with pre-tightening force adjusting device |
-
2017
- 2017-02-23 CN CN201710099129.6A patent/CN106623994B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524152A (en) * | 2019-09-17 | 2021-03-19 | 福建金风科技有限公司 | Bearing clearance adjusting device and method and wind generating set |
| CN112524152B (en) * | 2019-09-17 | 2023-05-09 | 福建金风科技有限公司 | Bearing play adjusting device and method and wind generating set |
| CN110653382A (en) * | 2019-10-16 | 2020-01-07 | 德州普利森机床有限公司 | Bearing pre-tightening method for spindle of large-through-hole headstock |
| CN110653382B (en) * | 2019-10-16 | 2020-10-16 | 德州普利森机床有限公司 | Bearing pre-tightening method for spindle of large-through-hole headstock |
| CN113059201A (en) * | 2021-04-16 | 2021-07-02 | 哈尔滨理工大学 | High-speed electric spindle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106623994B (en) | 2018-05-22 |
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Address after: 650203 No. 23 Dam Road, Yunnan, Kunming Patentee after: General technology Group Kunming Machine Tool Co.,Ltd. Address before: 650203 No. 23 Dam Road, Yunnan, Kunming Patentee before: SHENJI GROUP KUNMING MACHINE TOOL Co.,Ltd. |