CN114669765A - Hybrid bearing for electric main shaft of machine tool - Google Patents
Hybrid bearing for electric main shaft of machine tool Download PDFInfo
- Publication number
- CN114669765A CN114669765A CN202210377103.4A CN202210377103A CN114669765A CN 114669765 A CN114669765 A CN 114669765A CN 202210377103 A CN202210377103 A CN 202210377103A CN 114669765 A CN114669765 A CN 114669765A
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- CN
- China
- Prior art keywords
- oil
- bearing
- gas
- main shaft
- dynamic
- 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.)
- Pending
Links
- 239000003921 oil Substances 0.000 claims abstract description 61
- 238000005461 lubrication Methods 0.000 claims abstract description 26
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 230000003068 static effect Effects 0.000 claims abstract description 17
- 239000010687 lubricating oil Substances 0.000 claims abstract description 11
- 238000000889 atomisation Methods 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000004880 explosion Methods 0.000 abstract description 3
- 230000001050 lubricating effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000009688 liquid atomisation Methods 0.000 description 1
Images
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
-
- 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
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/12—Arrangements for cooling or lubricating parts of the machine
- B23Q11/121—Arrangements for cooling or lubricating parts of the machine with lubricating effect for reducing friction
- B23Q11/123—Arrangements for cooling or lubricating parts of the machine with lubricating effect for reducing friction for lubricating spindle bearings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a dynamic and static pressure bearing used on an electric main shaft of a machine tool, which comprises a main shaft and a bearing, wherein four dynamic and static pressure oil cavities are arranged on the surface of the bearing opposite to the main shaft, and the dynamic and static pressure oil cavities are connected with an oil-gas two-phase fluid lubrication supply system through a flow restrictor and an oil-gas conveying pipeline below the bearing. The dynamic-static pressure bearing on the electric main shaft of the high-speed precision machine tool is an oil-gas lubrication mode in which a small amount of lubricating oil is injected into gas, can avoid the bad phenomena of cavitation, gas explosion and the like generated in the bearing, and fully exerts the advantages of oil-gas lubrication.
Description
Technical Field
The invention belongs to the technical field of bearings, and particularly relates to a dynamic and static pressure bearing for an electric spindle of a machine tool.
Background
At present, a high-speed numerical control machining technology is an advanced manufacturing technology for realizing high-quality, high-efficiency, low-consumption, flexible and environment-friendly machining, the high-speed numerical control machine tool is advanced manufacturing equipment for realizing high-speed machining, the primary key technology of the high-speed numerical control machine tool is a high-speed high-power main shaft, and a high-speed precision bearing is a supporting core of an electric main shaft. At present, the dynamic and static pressure sliding bearing is widely applied to the electric main shaft of a high-speed machine tool, the dynamic and static pressure sliding bearing can be divided into an air lubrication type and a liquid lubrication type according to different lubricating media, the friction force of the air lubrication bearing is very small, and the dynamic and static pressure sliding bearing is suitable for working conditions of high speed and even ultra high speed, but the air film rigidity is lower, the overload resistance is poor, and the dynamic and static pressure sliding bearing can only be used for the electric main shaft of the high-speed and light-load machine tool. The oil film rigidity and the bearing capacity of the liquid lubrication bearing are relatively much larger, the practical application range is wider than that of an air lubrication bearing, but the liquid bearing generates heat seriously when running at high speed, and the increase of the rotating speed of the main shaft is limited greatly by friction heat generation.
In recent years, two forms of oil mist lubrication and oil-gas lubrication are widely applied to bearings, the oil mist lubrication can greatly reduce damage of mechanical friction parts caused by lubrication problems, oil gas lubrication does not atomize oil, a small amount of lubricating oil crawls forwards along the wall of a conveying pipeline by utilizing compressed air to be continuously and accurately supplied to each lubricating point, micro oil drops form a dynamic pressure oil film at the lubricating parts, and air takes away part of heat generated by the operation of the bearings.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a dynamic and static pressure bearing for a machine tool electric main shaft, which is used for a high-speed precision machine tool electric main shaft in an oil-gas lubrication mode that a small amount of lubricating oil is injected into gas, can avoid the bad phenomena of cavitation, gas explosion and the like generated in the bearing, and fully exerts the advantages of oil-gas lubrication.
In order to achieve the purpose, the invention adopts the technical scheme that:
a hybrid bearing for a machine tool electric main shaft comprises a main shaft 10 and a bearing 3, wherein four hybrid oil chambers 1 are arranged on the surface of the bearing 3 opposite to the main shaft 10, and the hybrid oil chambers 1 are connected with an oil-gas two-phase fluid lubrication supply system through a throttle 2 and an oil-gas conveying pipeline 4 below the bearing 3.
The oil-gas two-phase fluid lubrication supply system comprises an air compressor 5, a gas outlet of the air compressor 5 is connected with an oil atomization mixing valve 7 through an air pressure regulating valve 6 and a pipeline, a lubricating oil tank 9 is connected with the oil atomization mixing valve 7 through an oil flow regulating valve 8 and a pipeline, and oil-gas two-phase fluid generated by the oil atomization mixing valve 7 is connected with a bearing restrictor 2 through an oil-gas conveying pipeline 4 and then is communicated with oil cavities.
The oil-gas two-phase fluid generated by the oil atomization mixing valve 7 is a two-phase fluid in which oil atomization particles and gas are uniformly mixed.
The size of the oil atomized particles is 0.05-0.1 mm.
The invention has the beneficial effects that:
the hybrid bearing provided by the invention can avoid the adverse phenomena of cavitation, gas explosion and the like in the bearing and fully play the advantages of oil-gas lubrication.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The number of the main shaft is as follows, 1, a dynamic and static pressure oil chamber, 2, a restrictor, 3, a bearing, 4, an oil and gas conveying pipeline, 5, an air compressor, 6, an air pressure regulating valve, 7, an oil liquid atomization mixing valve, 8, an oil liquid flow regulating valve, 9, a lubricating oil tank and 10.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1: the device comprises a main shaft 10 and a bearing 3, wherein the bearing 3 is provided with four dynamic and static pressure oil chambers 1 on the surface opposite to the main shaft 10, and the dynamic and static pressure oil chambers 1 are connected with an oil-gas two-phase fluid lubrication supply system through a throttle 2 and an oil-gas conveying pipeline 4 below the bearing 3.
In this embodiment, the oil-gas two-phase fluid lubrication supply system includes an air compressor 5, an air pressure regulating valve 6, an oil atomization mixing valve 7, an oil flow regulating valve 8, a lubricating oil tank 9, and an oil-gas delivery pipeline 4, wherein a gas outlet of the air compressor 5 is connected with the oil atomization mixing valve 7 through the air pressure regulating valve 6 and a pipeline, the lubricating oil tank 9 is connected with the oil atomization mixing valve 7 through the oil flow regulating valve 8 and a pipeline, and an oil-gas two-phase fluid generated by the oil atomization mixing valve 7 is connected with the bearing restrictor 2 through the oil-gas delivery pipeline 4 and then is communicated with each oil cavity. The oil-gas two-phase fluid generated by the oil atomization mixing valve 7 is a two-phase fluid in which oil atomization particles and gas are uniformly mixed. The size of the atomized oil particles is 0.05-0.1 mm.
In this embodiment, the size of the oil atomized particles 13 is 0.08 mm. The oil in the oil-gas two-phase fluid is selected according to the requirements of bearing running performance, and the grades and the viscosity of the oil are different. The oil-gas two-phase fluid selects different air and oil liquid mixing proportions according to the requirements of the running performance of the bearing.
The working principle of the invention is as follows:
firstly, pressure gas is generated by an air compressor 5, proper gas pressure is obtained through the adjustment of an air pressure adjusting valve 6, lubricating oil in a lubricating oil tank 9 is adjusted to the required flow size through an oil flow adjusting valve 8, then the lubricating oil is injected into an oil atomizing and mixing valve 7, oil is atomized into the required particle size under the action of the pressure gas, and the oil and the gas are uniformly mixed. The oil-gas two-phase fluid generated by the oil-gas lubrication supply system is uniformly input into the bearing dynamic and static pressure oil cavity 1 through the oil-gas conveying pipeline 4 and the throttler 2. The restrictor 2 assembly is a pressure feedback element of a dynamic and static hydraulic oil cavity, and plays a role in adjusting the oil film pressure between the shaft and each oil cavity, so that the shaft can obtain bearing capacity. Because the sliding bearing has a plurality of lubricating points, the point-to-point lubrication can not be carried out at each lubricating point like the traditional oil-gas lubrication. But unlike oil mist lubrication, the oil particles are much larger in size, reaching about 0.05-0.1mm in size. Because the oil particles have larger sizes and are easy to gather at narrow gaps, a pressure oil film is formed at the dynamic pressure surface of the bearing to play a role in lubricating the oil film.
Claims (4)
1. The dynamic and static pressure bearing for the electric main shaft of the machine tool is characterized by comprising a main shaft (10) and a bearing (3), wherein four dynamic and static pressure oil cavities (1) are arranged on the surface, opposite to the main shaft (10), of the bearing (3), and the dynamic and static pressure oil cavities (1) are connected with an oil-gas two-phase fluid lubrication supply system through a flow restrictor (2) below the bearing (3) and an oil-gas conveying pipeline (4).
2. The dynamic-static bearing for the electric main shaft of the machine tool as claimed in claim 1, wherein the oil-gas two-phase fluid lubrication supply system comprises an air compressor (5), a gas outlet of the air compressor (5) is connected with an oil atomization mixing valve (7) through an air pressure regulating valve (6) and a pipeline, a lubricating oil tank (9) is connected with the oil atomization mixing valve (7) through an oil flow regulating valve (8) and a pipeline, and the oil-gas two-phase fluid generated by the oil atomization mixing valve (7) is connected with the bearing restrictor (2) through an oil-gas conveying pipeline (4) and then is communicated with each oil cavity.
3. The dynamic-static pressure bearing for the electric spindle of the machine tool as claimed in claim 2, wherein the oil-gas two-phase fluid generated by the oil atomization mixing valve (7) is a two-phase fluid in which oil atomization particles and gas are uniformly mixed.
4. A hydro-hybrid bearing for use on the electric spindle of a machine tool as set forth in claim 3 wherein said atomized particles of oil are 0.05-0.1mm in size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210377103.4A CN114669765A (en) | 2022-04-12 | 2022-04-12 | Hybrid bearing for electric main shaft of machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210377103.4A CN114669765A (en) | 2022-04-12 | 2022-04-12 | Hybrid bearing for electric main shaft of machine tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114669765A true CN114669765A (en) | 2022-06-28 |
Family
ID=82077619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210377103.4A Pending CN114669765A (en) | 2022-04-12 | 2022-04-12 | Hybrid bearing for electric main shaft of machine tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114669765A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117283000A (en) * | 2023-09-13 | 2023-12-26 | 陕西关中工具制造有限公司 | High-speed motorized spindle of numerical control machine tool |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109409A (en) * | 2007-08-10 | 2008-01-23 | 广东工业大学 | Static pressure, static pressure bearing used for high speed precision machine tool principal axis |
| KR20090122059A (en) * | 2008-05-23 | 2009-11-26 | 아륭기공(주) | Air oil lubrication system |
-
2022
- 2022-04-12 CN CN202210377103.4A patent/CN114669765A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109409A (en) * | 2007-08-10 | 2008-01-23 | 广东工业大学 | Static pressure, static pressure bearing used for high speed precision machine tool principal axis |
| KR20090122059A (en) * | 2008-05-23 | 2009-11-26 | 아륭기공(주) | Air oil lubrication system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117283000A (en) * | 2023-09-13 | 2023-12-26 | 陕西关中工具制造有限公司 | High-speed motorized spindle of numerical control machine tool |
| CN117283000B (en) * | 2023-09-13 | 2024-03-15 | 陕西关中工具制造有限公司 | High-speed motorized spindle of numerical control machine tool |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220628 |