CN114083230A - Novel slewing bearing for tooth surface self-lubricating and preparation method thereof - Google Patents
Novel slewing bearing for tooth surface self-lubricating and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 239000002131 composite material Substances 0.000 claims abstract description 71
- 239000000314 lubricant Substances 0.000 claims abstract description 60
- 239000000843 powder Substances 0.000 claims abstract description 54
- 239000007787 solid Substances 0.000 claims abstract description 46
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 40
- 230000001050 lubricating effect Effects 0.000 claims abstract description 39
- 230000008595 infiltration Effects 0.000 claims abstract description 26
- 238000001764 infiltration Methods 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 23
- 238000010330 laser marking Methods 0.000 claims abstract description 21
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 claims abstract description 20
- 229940010552 ammonium molybdate Drugs 0.000 claims abstract description 20
- 235000018660 ammonium molybdate Nutrition 0.000 claims abstract description 20
- 239000011609 ammonium molybdate Substances 0.000 claims abstract description 20
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004327 boric acid Substances 0.000 claims abstract description 20
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 20
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000011259 mixed solution Substances 0.000 claims abstract description 19
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 239000003595 mist Substances 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims description 54
- 238000005498 polishing Methods 0.000 claims description 25
- 238000000227 grinding Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 17
- 230000003746 surface roughness Effects 0.000 claims description 15
- 238000005118 spray pyrolysis Methods 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 7
- 230000002194 synthesizing effect Effects 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000009715 pressure infiltration Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 12
- 239000011664 nicotinic acid Substances 0.000 abstract description 9
- 238000005299 abrasion Methods 0.000 abstract description 7
- 239000000758 substrate Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000003786 synthesis reaction Methods 0.000 abstract 1
- 238000005979 thermal decomposition reaction Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 14
- 239000004519 grease Substances 0.000 description 11
- 238000005461 lubrication Methods 0.000 description 10
- 229910052581 Si3N4 Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 210000003462 vein Anatomy 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/30—Making metallic powder or suspensions thereof using chemical processes with decomposition of metal compounds, e.g. by pyrolysis
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
- C23C26/02—Coating not provided for in groups C23C2/00 - C23C24/00 applying molten material to the substrate
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- Mechanical Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Sliding-Contact Bearings (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention discloses a novel slewing bearing for tooth surface self-lubricating and a preparation method thereof. The tooth surface of the slewing bearing is processed into a flow channel micro-texture by a laser marking technology, and the solid lubricant can be more fully spread on the surface of a substrate through the bionic micro-texture to form a layer of lubricating film, so that the effects of reducing friction and reducing material abrasion are achieved. The composite solid lubricant is multi-element hollow spherical composite lubricant powder with a single-particle structure, and is prepared by spraying a mixed solution of ammonium molybdate, silver nitrate, boric acid and ammonium tungstate into a high-temperature atmosphere at 700-800 ℃ in a mist form, and performing thermal decomposition and synthesis. The composite spherical powder is used as a solid lubricating phase and is filled into the microtexture through vacuum infiltration, so that the self-lubricating composite material with the lubricating phase on the tooth surface is obtained.
Description
Technical Field
The invention relates to the technical field of processing of tooth surfaces of slewing bearings, in particular to a novel slewing bearing for self-lubricating a tooth surface and a preparation method thereof.
Background
The slewing bearing is a novel mechanical part and comprises an inner ring, an outer ring, a rolling body and the like, and the slewing bearing is a large bearing capable of bearing comprehensive loads and can simultaneously bear larger axial and radial loads and overturning moment. The energy-saving device is widely applied to the fields of engineering machinery and new energy sources such as heavy flat transport vehicles, container cranes, truck-mounted cranes, high-altitude operation vehicles, solar power generation systems and the like.
In the case of slewing bearing fault damage in recent years, the slewing bearing fault damage not only generates hundreds of thousands or even millions of maintenance costs, but also causes long-term shutdown of equipment, and causes great influence and great economic loss to normal production and life of the platform.
Under the working environment of the slewing bearing under the condition of long-term low-speed heavy load, two forms which are most prone to failure are the meshing surface of the slewing bearing and the raceway of the slewing bearing respectively. Because the pinion and the large tooth surface are in open type meshing transmission and are in a severe working environment for a long time, lubricating grease on the tooth surface falls off quickly, and the lubricating and protecting effects cannot be effectively achieved. In addition, the contact surface temperature is too high, and the grease film is easily damaged, which causes wear of the substrate. Therefore, under the action of reciprocating high-stress load, the lubricating mode of only lubricating grease can not meet the working requirement far away. In order to prolong the service life and improve the wear resistance of the slewing bearing, a slewing bearing with strong wear resistance needs to be developed to meet the engineering requirements in a harsh environment.
Therefore, a novel slewing bearing for tooth surface self-lubricating and a preparation method thereof are provided.
Disclosure of Invention
The invention aims to provide a novel slewing bearing for tooth surface self-lubricating and a preparation method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a novel slewing bearing for self-lubricating tooth surfaces and a preparation method thereof are characterized in that the tooth surfaces of the slewing bearing are processed into a flow channel micro-texture by a laser marking technology, and composite spherical powder is used as a solid lubricating phase and filled into the micro-texture to obtain a self-lubricating composite material with the lubricating phase on the tooth surfaces.
According to the scheme, the geometrical parameters of the tooth surface flow channel microtexture of the slewing bearing are as follows: the aperture is 600-800 μm; aperture spacing: 300 to 500 μm; the depth of the flow channel is as follows: 300 to 500 μm;
according to the scheme, the composite spherical powder comprises the following raw materials in percentage by mass: 10-20 wt.% of ammonium molybdate solution, 60-75 wt.% of silver nitrate solution, 3-5 wt.% of boric acid solution and 6-12 wt.% of ammonium tungstate solution;
according to the scheme, the particle size range of the hollow spherical powder in the composite solid lubricant is 50-80 microns.
According to the scheme, the composite lubricant powder is prepared by thermally decomposing and synthesizing a mixed solution of ammonium molybdate, silver nitrate, boric acid and ammonium tungstate through a spray pyrolysis method.
Further, the preparation method of the composite lubricant mainly comprises the following steps:
(1) mixing and stirring 0.5mol/L ammonium molybdate solution, 0.10mol/L silver nitrate solution, 0.05mol/L boric acid solution and 0.05mol/L ammonium tungstate solution according to the proportion of 1:5:1:1 to form mixed solution;
(2) spraying the mixed solution into a high-temperature atmosphere at 700-800 ℃ in a mist form to separate out solid particle powder;
(3) collecting fine powder to prepare multi-element hollow spherical composite lubricant powder with a single-particle structure;
the invention also aims to provide a novel slewing bearing for tooth surface self-lubricating and a preparation method thereof, and the method mainly comprises the following steps:
(1) grinding and polishing: before the laser reaches the standard, the tooth surface needs to be ground and polished to ensure that the surface roughness is less than 0.05 mu m;
(2) preparation of a lubricating phase: preparing multi-element hollow spherical composite lubricant powder with a single-particle structure at 700-800 ℃ by means of spray pyrolysis;
(3) laser marking: and marking a runner type structure on the tooth surface of the slewing bearing by using a laser marking machine. Obtaining a tooth surface of a slewing bearing with a runner type microstructure;
(4) grinding and polishing: before the solution infiltration, the tooth surface after the laser reaches the standard is ground and polished to ensure that the surface roughness is less than 0.01 mu m;
(5) infiltration filling: filling composite lubricant powder into the tooth surface of the flow channel type microstructure through a vacuum infiltration method to enable the tooth surface to be provided with the flow channel type composite material of the solid lubricant;
(6) grinding and polishing: and (4) grinding and polishing the dissolved and infiltrated tooth surface to ensure that the surface roughness is less than 0.01 mu m. And after polishing the sample, putting the sample into absolute ethyl alcohol, cleaning the sample for 10-15 min by using an ultrasonic cleaner, and drying the sample by using a blower after the sample is cleaned.
According to the scheme, the marking power of the laser marking machine in the step (3) is as follows: 20W; the number of scans was: 4-8 times; the scanning speed of the laser is: 1200 to 1800 mm/s.
According to the scheme, the vacuum infiltration method adopted in the step (5) comprises the following steps: respectively placing the solid composite lubricant and the tooth surface sample of the slewing bearing on a crucible and a fixed bracket in a vacuum pressure infiltration furnace, and vacuumizing to 0.1-0.2 multiplied by 10～ 2Pa, heating the sample to 300-450 ℃, keeping the temperature for 40-60 min, immersing the sample in the solid lubricant, simultaneously increasing the air pressure to 0.5-1.5 MPa, carrying out infiltration for 80-120 min, and cooling the sample to room temperature along with the furnace.
The novel slewing bearing for tooth surface self-lubricating, prepared by the invention, has excellent tribological performance, and the friction coefficient and the wear rate of the novel slewing bearing are obviously reduced. The wear depth in the test is 12.4-16.8 mu m, the average friction coefficient is 0.23-0.32, and the friction reducing and wear resisting performance is better. Therefore, the performance parameters of the novel slewing bearing for self-lubricating the tooth surface are superior to those of the common slewing bearing product.
The main conception of the antifriction and wear-resistant slewing bearing with the bionic structure and the preparation method thereof is as follows: aiming at the problems that the common slewing bearing can not ensure that the inner ring and the outer ring of the slewing bearing meet the requirements of complex working conditions only through grease lubrication under the action of reciprocating cyclic load, and a solid lubricant still has a good lubricating effect under the conditions of heavy load and cyclic load, the solid lubricating technology is adopted to cooperate with the grease lubrication to meet the requirements of the complex working conditions. In the friction process, the tooth surface of the slewing bearing transmits a solid self-lubricating material (carrier) on a contact surface under the action of cyclic load through a unique texture (branch structure) to finish substance transportation, and a solid lubricating film is formed to avoid direct contact of friction pairs, so that the functions of reducing friction and resisting wear are achieved. The typical vein distribution of the leaves in nature has the same working principle, and the plants transmit substances and energy (carriers) to the whole leaves by utilizing the veins (branch structures), and the veins obey the law of minimum energy consumption in the transmission process. Its typical branched structure always grows along the most efficient nutrient/energy transfer path with minimal material consumption. Inspired by this similarity, solid lubricant filled microchannels were designed in the matrix by mimicking veins. The hollow spherical powder is used as a composite solid lubricant, has lower shearing strength, and the soft metal can form a transfer film at a contact interface during friction, so that the friction is generated between the transfer film, thereby reducing the friction and the abrasion, achieving the lubricating effect, having good lubricating performance, being beneficial to the lubricating effect of the composite lubricant, reducing the material wear rate, reducing the friction surface abrasion, improving the stability of the slewing bearing and prolonging the service life.
Compared with the prior art, the invention has the beneficial effects that:
1. the slewing bearing has excellent tribological performance and low friction coefficient and wear rate. The wear rate of materials can be reduced, the wear of friction surfaces can be reduced, the stability and the service life of the slewing bearing can be improved, and the problems of high wear rate, short service life, poor stability and the like of the slewing bearing tooth surface of the existing product can be solved.
2. The tooth surface of the slewing bearing adopts a flow channel type microtexture form, and the solid lubricant can be more fully spread on the surface of the substrate through the bionic microtexture to form a layer of lubricating film, so that the effects of reducing friction and reducing material abrasion are achieved.
3. According to the slewing bearing, the composite lubricant powder is prepared by thermally decomposing and synthesizing a mixed solution of ammonium molybdate, silver nitrate, boric acid and ammonium tungstate through a spray pyrolysis method, and multiple lubricants have a synergistic effect, so that the lubricating effect is improved, and the antifriction and wear-resistant effects are achieved.
4. According to the slewing bearing, the mixed solution is sprayed into a high-temperature atmosphere at 700-800 ℃ in a mist form, solid particle powder is separated out, and the multi-element hollow spherical composite lubricant powder with a single-particle structure is prepared. The hollow spherical powder composite lubricant can improve the lubricating effect of the composite lubricant and play a role in reducing material abrasion.
5. The slewing bearing disclosed by the invention is designed by combining a composite solid lubrication technology with a bionic structure, and can prevent a base body from being damaged due to lubrication failure caused by the rupture of a lubricating grease film in the lubricating process of lubricating grease under the action of heavy load or alternating load. The lubricating grease film has limited bearing capacity, and when the acting load exceeds the limited bearing capacity, the thickness of the lubricating grease is reduced until the lubricating grease film is broken to cause lubrication failure, so that the inner ring and the outer ring are directly damaged by friction. Through the synergistic effect of solid lubrication and grease lubrication, the engineering application under complex working conditions can be met. The friction environment is improved, a layer of solid lubricating film is formed between the friction pairs, and the friction pairs are prevented from being in direct contact, so that the friction force is buffered to reduce the abrasion.
In summary, the following steps: the novel slewing bearing for tooth surface self-lubricating, prepared by the invention, has excellent tribological performance and low friction coefficient and wear rate. The wear depth in the test is 12.4-16.8 mu m, the average friction coefficient is 0.23-0.32, and the friction reducing and wear resisting performance is better. Therefore, the performance parameters of the novel slewing bearing for self-lubricating the tooth surface are superior to those of the common slewing bearing product.
Drawings
FIG. 1 is a process flow diagram of a novel slewing bearing for self-lubricating tooth surfaces and a preparation method thereof according to the invention;
FIG. 2 is a design diagram of a bionic microstructure of the novel self-lubricating slewing bearing with tooth surfaces according to the invention;
fig. 3 is a graph showing the change in friction coefficient of the slewing bearing according to examples 1, 2 and 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following examples, the composite spherical powder comprises the following raw materials in percentage by mass: 10-20 wt.% of ammonium molybdate solution, 60-75 wt.% of silver nitrate solution, 3-5 wt.% of boric acid solution and 6-12 wt.% of ammonium tungstate solution;
in the following embodiments, the antifriction and wear-resistant slewing bearing with the bionic structure has the machined surface on the tooth surface of the slewing bearing as shown in fig. 2. The bionic microstructure design of the antifriction wear-resistant slewing bearing adopts a flow channel type microstructure as shown in figure 3. The solid lubricant can be more fully spread on the surface of the substrate through the bionic microtexture to form a layer of lubricating film, thereby playing the roles of reducing friction and reducing material abrasion. The composite solid lubricant is multi-element hollow spherical composite lubricant powder with a single-particle structure, and the composite solid lubricant is mixed and filled into the bionic microstructures of the inner ring and the outer ring of the slewing bearing to obtain the slewing bearing with self-lubricating tooth surface. The composite spherical powder comprises the following raw materials in percentage by mass: 10-20 wt.% of ammonium molybdate solution, 60-75 wt.% of silver nitrate solution, 3-5 wt.% of boric acid solution and 6-12 wt.% of ammonium tungstate solution; the composite material is prepared by thermally decomposing and synthesizing a mixed solution of ammonium molybdate, silver nitrate, boric acid and ammonium tungstate through a spray pyrolysis method.
Control group:
the ordinary rotary bearing without any treatment is subjected to a friction wear test on an MFT-5000 friction tester, wherein the material of a grinding ball in the friction test is Si3N4, the displacement of reciprocating linear motion is 8mm, the reciprocating frequency is 1Hz, the loading pressure is 20N, the wear depth in the test is 24.8 mu m, and the average friction coefficient is 0.45.
Example 1:
a novel slewing bearing for self-lubricating tooth surfaces and a preparation method thereof are characterized in that the tooth surfaces of the slewing bearing are processed into a flow channel micro-texture by a laser marking technology, and composite spherical powder is used as a solid lubricating phase and filled into the micro-texture to obtain a self-lubricating composite material with the lubricating phase on the tooth surfaces.
In this embodiment, the geometric parameters of the tooth surface flow channel microtexture of the slewing bearing are as follows: the aperture is 600 mu m; aperture spacing: 300 mu m; the depth of the flow channel is as follows: 300 mu m;
the composite spherical powder comprises the following raw materials in percentage by mass: 10 wt.% ammonium molybdate solution, 60 wt.% silver nitrate solution, 3 wt.% boric acid solution, and 6 wt.% ammonium tungstate solution;
according to the scheme, the particle size range of the hollow spherical powder in the composite solid lubricant is 50-60 mu m.
According to the scheme, the composite lubricant powder is prepared by thermally decomposing and synthesizing a mixed solution of ammonium molybdate, silver nitrate, boric acid and ammonium tungstate through a spray pyrolysis method.
Further, the preparation method of the composite lubricant mainly comprises the following steps:
(1) respectively mixing and stirring 0.5mol/L ammonium molybdate solution, 0.10mol/L silver nitrate solution, 0.05mol/L boric acid solution and 0.05mol/L ammonium tungstate solution according to the mass percentage to form mixed solution;
(2) spraying the mixed solution into high-temperature atmosphere at 700 ℃ in a mist form to separate out solid particle powder;
(3) collecting the fine powder to prepare the multi-element hollow spherical composite lubricant powder with a single-particle structure.
The invention also aims to provide a novel slewing bearing for tooth surface self-lubricating and a preparation method thereof, and the method mainly comprises the following steps:
(1) grinding and polishing: before the laser reaches the standard, the tooth surface needs to be ground and polished to ensure that the surface roughness is 0.04 mu m;
(2) preparation of a lubricating phase: preparing multi-element hollow spherical composite lubricant powder with a single-particle structure at the temperature of 700 ℃ in a spray pyrolysis mode;
(3) laser marking: and marking a runner type structure on the tooth surface of the slewing bearing by using a laser marking machine. Obtaining a tooth surface of a slewing bearing with a runner type microstructure;
(4) grinding and polishing: before the solution infiltration, the tooth surface after the laser reaches the standard is ground and polished to ensure that the surface roughness is 0.01 mu m;
(5) infiltration filling: filling composite lubricant powder into the tooth surface of the flow channel type microstructure through a vacuum infiltration method to enable the tooth surface to be provided with the flow channel type composite material of the solid lubricant;
(6) grinding and polishing: and (4) grinding and polishing the dissolved and infiltrated tooth surface to ensure that the surface roughness is less than 0.01 mu m. And after polishing the sample, putting the sample into absolute ethyl alcohol, cleaning the sample for 10min by using an ultrasonic cleaner, and drying the sample by using a blower after the sample is cleaned.
According to the scheme, the marking power of the laser marking machine in the step (3) is as follows: 20W; the number of scans was: 5 times; the scanning speed of the laser is: 1200 mm/s.
According to the scheme, the vacuum infiltration method adopted in the step (5) comprises the following steps: respectively placing the solid composite lubricant and a tooth surface sample of the slewing bearing on a crucible and a fixed support in a vacuum pressure infiltration furnace, vacuumizing to 0.1 multiplied by 10-2 Pa, heating to 300 ℃, keeping the temperature for 60min, immersing the sample in the solid lubricant, simultaneously increasing the air pressure to 1MPa, carrying out infiltration for 90min, and cooling to room temperature along with the furnace.
The novel slewing bearing for tooth surface self-lubrication prepared in the embodiment is used for friction and wear testing on an MFT-5000 friction tester, wherein a friction ball material in the friction test is Si3N4, the displacement of reciprocating linear motion is 8mm, the reciprocating frequency is 1Hz, the loading pressure is 20N, the wear depth in the test is 16.2 μm, the average friction coefficient is 0.31, and the novel slewing bearing has good friction and wear resistance.
Example 2:
a novel slewing bearing for self-lubricating tooth surfaces and a preparation method thereof are characterized in that the tooth surfaces of the slewing bearing are processed into a flow channel micro-texture by a laser marking technology, and composite spherical powder is used as a solid lubricating phase and filled into the micro-texture to obtain a self-lubricating composite material with the lubricating phase on the tooth surfaces.
In this embodiment, the geometric parameters of the tooth surface flow channel microtexture of the slewing bearing are as follows: the aperture is 700 mu m; aperture spacing: 400 μm; the depth of the flow channel is as follows: 500 μm;
the composite spherical powder comprises the following raw materials in percentage by mass: 15 wt.% ammonium molybdate solution, 65 wt.% silver nitrate solution, 4 wt.% boric acid solution, and 10 wt.% ammonium tungstate solution;
according to the scheme, the particle size range of the hollow spherical powder in the composite solid lubricant is 60-70 mu m.
According to the scheme, the composite lubricant powder is prepared by thermally decomposing and synthesizing a mixed solution of ammonium molybdate, silver nitrate, boric acid and ammonium tungstate through a spray pyrolysis method.
Further, the preparation method of the composite lubricant mainly comprises the following steps:
(1) respectively mixing and stirring 0.5mol/L ammonium molybdate solution, 0.10mol/L silver nitrate solution, 0.05mol/L boric acid solution and 0.05mol/L ammonium tungstate solution according to the mass percentage to form mixed solution;
(2) spraying the mixed solution into high-temperature atmosphere at 750 ℃ in a mist form to separate out solid particle powder;
(3) collecting the fine powder to prepare the multi-element hollow spherical composite lubricant powder with a single-particle structure.
The invention also aims to provide a novel slewing bearing for tooth surface self-lubricating and a preparation method thereof, and the method mainly comprises the following steps:
(1) grinding and polishing: before the laser reaches the standard, the tooth surface needs to be ground and polished to ensure that the surface roughness is 0.04 mu m;
(2) preparation of a lubricating phase: preparing multi-element hollow spherical composite lubricant powder with a single-particle structure at the temperature of 750 ℃ in a spray pyrolysis mode;
(3) laser marking: and marking a runner type structure on the tooth surface of the slewing bearing by using a laser marking machine. Obtaining a tooth surface of a slewing bearing with a runner type microstructure;
(4) grinding and polishing: before the solution infiltration, the tooth surface after the laser reaches the standard is ground and polished to ensure that the surface roughness is 0.01 mu m;
(5) infiltration filling: filling composite lubricant powder into the tooth surface of the flow channel type microstructure through a vacuum infiltration method to enable the tooth surface to be provided with the flow channel type composite material of the solid lubricant;
(6) grinding and polishing: and (4) grinding and polishing the dissolved and infiltrated tooth surface to ensure that the surface roughness is less than 0.01 mu m. And after polishing the sample, putting the sample into absolute ethyl alcohol, cleaning the sample for 15min by using an ultrasonic cleaner, and drying the sample by using a blower after cleaning.
According to the scheme, the marking power of the laser marking machine in the step (3) is as follows: 20W; the number of scans was: 6 times; the scanning speed of the laser is: 1600 mm/s.
According to the scheme, the vacuum infiltration method adopted in the step (5) comprises the following steps: respectively placing the solid composite lubricant and a tooth surface sample of the slewing bearing on a crucible and a fixed support in a vacuum pressure infiltration furnace, vacuumizing to 0.1 multiplied by 10-2 Pa, heating to 400 ℃, keeping the temperature for 50min, immersing the sample in the solid lubricant, simultaneously increasing the air pressure to 1MPa, and carrying out infiltration for 60 min. Cooling to room temperature along with the furnace.
The novel slewing bearing for tooth surface self-lubrication prepared in the embodiment is used for friction and wear test on an MFT-5000 friction tester, wherein a friction ball material in the friction test is Si3N4, the displacement of reciprocating linear motion is 8mm, the reciprocating frequency is 1Hz, the loading pressure is 20N, the wear depth in the test is 14.2 μm, the average friction coefficient is 0.28, and the novel slewing bearing has good friction and wear resistance.
Example 3:
a novel slewing bearing for self-lubricating tooth surfaces and a preparation method thereof are characterized in that the tooth surfaces of the slewing bearing are processed into a flow channel micro-texture by a laser marking technology, and composite spherical powder is used as a solid lubricating phase and filled into the micro-texture to obtain a self-lubricating composite material with the lubricating phase on the tooth surfaces.
In this embodiment, the geometric parameters of the tooth surface flow channel microtexture of the slewing bearing are as follows: the aperture is 800 μm; aperture spacing: 500 μm; the depth of the flow channel is as follows: 500 μm;
the composite spherical powder comprises the following raw materials in percentage by mass: 20 wt.% ammonium molybdate solution, 70 wt.% silver nitrate solution, 5 wt.% boric acid solution, and 12 wt.% ammonium tungstate solution;
according to the scheme, the particle size range of the hollow spherical powder in the composite solid lubricant is 60-80 mu m.
According to the scheme, the composite lubricant powder is prepared by thermally decomposing and synthesizing a mixed solution of ammonium molybdate, silver nitrate, boric acid and ammonium tungstate through a spray pyrolysis method.
Further, the preparation method of the composite lubricant mainly comprises the following steps:
(1) respectively mixing and stirring 0.5mol/L ammonium molybdate solution, 0.10mol/L silver nitrate solution, 0.05mol/L boric acid solution and 0.05mol/L ammonium tungstate solution according to the mass percentage to form mixed solution;
(2) spraying the mixed solution into high-temperature atmosphere at 800 ℃ in a mist form to separate out solid particle powder;
(3) collecting the fine powder to prepare the multi-element hollow spherical composite lubricant powder with a single-particle structure.
The invention also aims to provide a novel slewing bearing for tooth surface self-lubricating and a preparation method thereof, and the method mainly comprises the following steps:
(1) grinding and polishing: before the laser reaches the standard, the tooth surface needs to be ground and polished to ensure that the surface roughness is 0.04 mu m;
(2) preparation of a lubricating phase: preparing multi-element hollow spherical composite lubricant powder with a single-particle structure at 800 ℃ by means of spray pyrolysis;
(3) laser marking: and marking a runner type structure on the tooth surface of the slewing bearing by using a laser marking machine. Obtaining a tooth surface of a slewing bearing with a runner type microstructure;
(4) grinding and polishing: before the solution infiltration, the tooth surface after the laser reaches the standard is ground and polished to ensure that the surface roughness is 0.01 mu m;
(5) infiltration filling: filling composite lubricant powder into the tooth surface of the flow channel type microstructure through a vacuum infiltration method to enable the tooth surface to be provided with the flow channel type composite material of the solid lubricant;
(6) grinding and polishing: and (4) grinding and polishing the dissolved and infiltrated tooth surface to ensure that the surface roughness is less than 0.01 mu m. And after polishing the sample, putting the sample into absolute ethyl alcohol, cleaning the sample for 15min by using an ultrasonic cleaner, and drying the sample by using a blower after cleaning.
According to the scheme, the marking power of the laser marking machine in the step (3) is as follows: 20W; the number of scans was: 4 times; the scanning speed of the laser is: 1800 mm/s.
According to the scheme, the vacuum infiltration method adopted in the step (5) comprises the following steps: respectively placing the solid composite lubricant and the tooth surface sample of the slewing bearing on a crucible and a fixed support in a vacuum pressure infiltration furnace, vacuumizing to 0.1 multiplied by 10-2 Pa, heating to 450 ℃, preserving the temperature for 40min, immersing the sample in the solid lubricant, simultaneously increasing the air pressure to 1MPa, and carrying out infiltration for 80 min. Cooling to room temperature along with the furnace.
The novel slewing bearing for tooth surface self-lubrication prepared by the embodiment is used for friction and wear test on an MFT-5000 friction tester, wherein a friction ball material in the friction test is Si3N4, the displacement of reciprocating linear motion is 8mm, the reciprocating frequency is 1Hz, the loading pressure is 20N, the wear depth in the test is 12.8 μm, the average friction coefficient is 0.24, and the novel slewing bearing has better antifriction and wear resistance.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A novel slewing bearing for tooth surface self-lubricating and a preparation method thereof comprise a slewing bearing, and are characterized in that: processing a flow channel micro-texture on the tooth surface of the slewing bearing by a laser marking technology, and filling the micro-texture with composite spherical powder serving as a solid lubricating phase to obtain a self-lubricating composite material with a lubricating phase on the tooth surface;
the preparation method comprises the following steps:
(1) grinding and polishing: before the laser reaches the standard, the tooth surface needs to be ground and polished to ensure that the surface roughness is less than 0.05 mu m;
(2) preparation of a lubricating phase: preparing multi-element hollow spherical composite lubricant powder with a single-particle structure at 700-800 ℃ by means of spray pyrolysis;
(3) laser marking: marking a runner type structure on the tooth surface of the slewing bearing by using a laser marking machine to obtain the tooth surface of the slewing bearing with a runner type microstructure;
(4) grinding and polishing: before the solution infiltration, the tooth surface after the laser reaches the standard is ground and polished to ensure that the surface roughness is less than 0.01 mu m;
(5) infiltration filling: filling composite lubricant powder into the tooth surface of the flow channel type microstructure through a vacuum infiltration method to enable the tooth surface to be provided with the flow channel type composite material of the solid lubricant;
(6) grinding and polishing: and (3) grinding and polishing the dissolved and infiltrated tooth surface to enable the surface roughness of the tooth surface to be less than 0.01 mu m, putting the sample into absolute ethyl alcohol after polishing, cleaning the sample for 10-15 min by using an ultrasonic cleaner, and drying the sample by using a blower after cleaning.
2. The novel slewing bearing for self-lubricating of tooth surfaces and the preparation method thereof according to claim 1 are characterized in that: the composite spherical powder comprises the following raw materials in percentage by mass: 10-20 wt% of ammonium molybdate solution, 60-75 wt% of silver nitrate solution, 3-5 wt% of boric acid solution and 6-12 wt% of ammonium tungstate solution, and the composite spherical powder is prepared by thermally decomposing and synthesizing a mixed solution of ammonium molybdate, silver nitrate, boric acid and ammonium tungstate through a spray pyrolysis method.
3. The novel slewing bearing for self-lubricating of tooth surfaces and the preparation method thereof according to claim 1 are characterized in that:
the preparation method of the composite lubricant mainly comprises the following steps:
(1) mixing and stirring 0.5mol/L ammonium molybdate solution, 0.10mol/L silver nitrate solution, 0.05mol/L boric acid solution and 0.05mol/L ammonium tungstate solution according to the proportion of 1:5:1:1 to form mixed solution;
(2) spraying the mixed solution into a high-temperature atmosphere at 700-800 ℃ in a mist form to separate out solid particle powder;
(3) collecting the fine powder to prepare the multi-element hollow spherical composite lubricant powder with a single-particle structure.
4. The novel slewing bearing for self-lubricating of tooth surfaces and the preparation method thereof according to claim 1 are characterized in that: the geometrical parameters of the tooth surface flow channel microtexture of the slewing bearing are as follows: the aperture is 600-800 μm; aperture spacing: 300 to 500 μm; the depth of the flow channel is as follows: 300 to 500 μm.
5. The novel slewing bearing for self-lubricating of tooth surfaces and the preparation method thereof according to claim 1 are characterized in that: the marking power of the laser marking machine in the step (3) is as follows: 20W; the number of scans was: 4-8 times; the scanning speed of the laser is: 1200 to 1800 mm/s.
6. The novel slewing bearing for self-lubricating of tooth surfaces and the preparation method thereof according to claim 1 are characterized in that: the vacuum infiltration method adopted in the step (5) comprises the following steps: respectively placing the solid composite lubricant and the tooth surface sample of the slewing bearing on a crucible and a fixed support in a vacuum pressure infiltration furnace, vacuumizing to 0.1-0.2 multiplied by 10-2 Pa, heating to 300-450 ℃, keeping the temperature for 40-60 min, immersing the sample in the solid lubricant, simultaneously increasing the air pressure to 0.5-1.5 MPa, carrying out infiltration for 80-120 min, and cooling to room temperature along with the furnace.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114874827A (en) * | 2022-05-31 | 2022-08-09 | 武汉理工大学深圳研究院 | Slewing bearing lubricating grease and preparation method thereof |
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