CN110076343A - A kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process - Google Patents
A kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process Download PDFInfo
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- CN110076343A CN110076343A CN201910175017.3A CN201910175017A CN110076343A CN 110076343 A CN110076343 A CN 110076343A CN 201910175017 A CN201910175017 A CN 201910175017A CN 110076343 A CN110076343 A CN 110076343A
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- 238000005245 sintering Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000000314 lubricant Substances 0.000 claims abstract description 32
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000011148 porous material Substances 0.000 claims abstract description 15
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 12
- 238000004321 preservation Methods 0.000 claims abstract description 11
- 238000000748 compression moulding Methods 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 9
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 9
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 9
- 230000008520 organization Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 229910052718 tin Inorganic materials 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 239000011135 tin Substances 0.000 claims description 5
- 229910052582 BN Inorganic materials 0.000 claims description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 4
- 238000005461 lubrication Methods 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229920002545 silicone oil Polymers 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000010237 hybrid technique Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000006260 foam Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000714 At alloy Inorganic materials 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
Classifications
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/105—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing inorganic lubricating or binding agents, e.g. metal salts
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F3/26—Impregnating
-
- 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The present invention relates to a kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process, it includes sorting, mixing, molding, sintering, de- ester, pore-forming, continuous burning, heat preservation, soaking process；It is selection solid lubricant, alloy powder and pore creating material respectively, selected raw material is mixed in proportion using batch mixer, using molding machine by hybrid particles compression moulding, using vacuum sintering furnace by formed body high temperature sintering, pore creating material is separated during the sintering process, foam tissue is left on alloy body surface after pore creating material is taken away by vacuum, after sintered heat insulating is come out of the stove, sinter is immersed in fluid lubricant, makes to be sintered in hole and penetrates into fluid lubricant naturally；A kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process of the present invention, by selecting specific composition of raw materials, according to the sintering process of regulation, bimetallic bearing surface is set to form self-lubricating, low-resistance film with Wear vesistance, the wear-resisting property for improving bearing, extends service life.
Description
Technical field
The present invention relates to bearing production fields, are sintered more particularly to a kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing
Technique.
Background technique
Current self-lubricating bearing generally inlays graphite lubrication particle by punching by high-tensile strength brass and is made, entire axis
It holds and is made of full copper alloy, not only complex manufacturing technology, and higher cost, in addition the smelting of copper alloy has centainly environment
Pollution, need to improve this traditional processing technology.Also have in recent years and is repeatedly sintered by meshbeltfurnace atmosphere protection, repeatedly
The method of rolling makes bimetallic self-lubricating bearing slide plate.Due to the multiple rolling of entire production technology, repeatedly it is sintered, sinter layer
Surface forms compact texture, can not form porous organization on the surface of sinter layer to add lubricant, in addition the sintering of starting
Temperature makes the evaporation of organic matter at 1000 degree or so, in the effect of high temperature, makes to be also impossible to be formed inside sinter layer containing organic profit
Lubrication prescription tissue cannot achieve the purpose that improve bearing service life so that the film for reducing frictional force can not be formed.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing agglomerants
Skill according to sorting, mixing, molding, sintering, de- ester, pore-forming, continuous burning, heat preservation, impregnates work by selecting specific composition of raw materials
Skill step makes sintering bimetal self-lubricating bearing surface not only contain solid lubricant and also contains organic lubricant or hydrodynamic lubrication
Agent, and the low-resistance film with mill performance is formd, the wear-resisting property of bearing is improved, service life is extended.
The technical solution adopted by the present invention to solve the technical problems is: a kind of porous oil-containing bimetallic anti-attrition self-lubricating axis
Sintering process is held, it includes sorting, mixing, molding, sintering, de- ester, pore-forming, continuous burning, heat preservation, soaking process；It is selection respectively
Solid lubricant, alloy powder and pore creating material are mixed selected raw material using batch mixer in proportion, will mixing using molding machine
Grain compression moulding separates pore creating material during the sintering process using vacuum sintering furnace by formed body high temperature sintering, in pore creating material quilt
Vacuum on alloy body surface leaves foam tissue after taking away, and after sintered heat insulating is come out of the stove, sinter is immersed in fluid lubricant
In, make to be sintered in hole and penetrates into fluid lubricant naturally.
The solid lubricant that raw material used in the sorting is made of boron nitride, graphite, by copper, iron, zinc, tin, nickel structure
At alloy powder, by the pore creating material based on polymethyl methacrylate, the pore creating material is commonly called as organic glass.
The fineness of the solid lubricant particle is more than 5000 mesh；The copper, iron, nickel fineness more than 300 mesh, institute
The fineness of zinc and tin is stated more than 200 mesh；The fineness of the poly methyl methacrylate particle is more than 200 mesh.
The hybrid technique is stirred 3 hours after being mixed raw mixture in proportion using batch mixer；The molding work
Skill is to use molding machine by raw mixture compression moulding.
The sintering, de- ester, pore-forming technique are that the mixture of compression moulding is carried out 500 DEG C or so using vacuum sintering furnace
High temperature sintering, heat preservation makes its vacuum degreasing, vacuum degree 6.7X10 in 2 hours-3, keep the polymethyl methacrylate in mixture logical
It crosses vacuum and high temperature is allowed to gasify, taken away by vacuum, make to form porous organization inside sintered surface.
Mixture is continuously heating to be sintered in vacuum sintering furnace by the continuous burning, heat preservation method, and temperature is controlled 1050
DEG C, it comes out of the stove after then keeping the temperature 2.5 hours.
The soaking technology is to have formed the sinter of porous organization after coming out of the stove to be put into external-heat heating in vacuum tank body,
As the 6.7X10 that vacuum degree reaches capacity-1When, then silicone oil is put into the inside of tank body by valve, sinter is impregnated wherein,
It is taken out after being kept for 3 hours, makes self-assembling formation fluid lubricant in sinter surface hole defect.
Beneficial effects of the present invention: a kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process of the invention leads to
Oversintering pore-creating, then penetrate into organic lubricant within sinter layer in such a way that high vacuum heats absorption deposition, make organic
Lubricant synthesizes one layer of lower resistance film or surface aggregate into high molecular polymer film under the heat effect that rubs with metal surface,
This wear-resisting property that can be reduced coefficient of friction similar to metallic soap molecule, improve bearing.
Detailed description of the invention
Fig. 1 is a kind of flow chart of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process of example.
Specific embodiment
In order to deepen the understanding of the present invention, the present invention is done below in conjunction with drawings and examples and is further retouched in detail
It states, the embodiment is only for explaining the present invention, does not constitute and limits to protection scope of the present invention.
Embodiment
As shown in Figure 1, present embodiments providing a kind of stream of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process
Cheng Tu；A kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process, it includes sorting (step 1), mixing (step
Two) (step 3), sintering (step 4), de- ester (step 5), pore-forming (step 6), continuous burning (step 7), heat preservation (step, are formed
It is rapid eight), impregnate (step 9) process；The solid lubricant that raw material used in the sorting is made of boron nitride, graphite, by
The alloy powder that copper, iron, zinc, tin, nickel are constituted, by the pore creating material based on polymethyl methacrylate, the pore creating material has been commonly called as
Machine glass；The fineness of the solid lubricant particle is more than 5000 mesh；The copper, iron, nickel fineness more than 300 mesh,
The fineness of the zinc and tin is more than 200 mesh；The fineness of the poly methyl methacrylate particle is more than 200 mesh；It is described mixed
Close technique be using batch mixer raw mixture mix in proportion after stir 3 hours, the batch mixer revolving speed for 8 turns/
min；The moulding process is using molding machine by raw mixture compression moulding, and the molding machine pressure is 600 tons；It is described
Sintering process, de- ester, pore-forming technique are the high temperature that the mixture of compression moulding is first carried out to 500 DEG C or so using vacuum sintering furnace
Sintering, heat preservation make its vacuum degreasing in 2 hours, the polymethyl methacrylate in mixture are made to be allowed to gas by vacuum and high temperature
Change, taken away by vacuum, makes to form porous organization inside sintered surface, the vacuum drying oven vacuum degree index is 6.7X10-3, heating
1320 DEG C of maximum temperature,；Mixture is continuously heating to be sintered in vacuum sintering furnace by the continuous burning, heat preservation method, temperature control
System is come out of the stove after then keeping the temperature 2.5 hours at 1050 DEG C；The soaking technology is the sinter that porous organization has been formed after coming out of the stove
It is put into external-heat heating in vacuum tank body, as the 6.7X10 that vacuum degree reaches capacity-1When, then silicone oil is put into tank body by valve
Inside, by sinter impregnate wherein, keep 3 hours after take out, make self-assembling formation fluid lubricant in sinter surface hole defect.
Above-described solid lubricant is in addition to boron nitride, graphite, there are also molybdenum disulfide etc., the organic lubricant liquid
Body lubricant includes such as polytetrafluoroethylene (PTFE), nylon, polyethylene, polyimides, petroleum basis oil lubricant and grease type, this hair
Bright middle utilization is silicone oil as fluid lubricant.
A kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process provided in an embodiment of the present invention, makes sintered
Bimetal self-lubricating bearing surface forms porous organization, not only also contains organic lubricant or hydrodynamic lubrication containing solid lubricant
Agent may be implemented under conditions of without artificial addition lubricant, and the friction by itself forms lubricating film according to lubricant itself is generated,
To achieve the purpose that reduce coefficient of friction, increase wearability, improve service life.
Above-described embodiment should not in any way limit the present invention, all to be obtained by the way of equivalent replacement or equivalency transform
Technical solution fall within the scope of protection of the present invention.
Claims (7)
1. a kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process, it is characterised in that: it include sorting, mixing, at
Type, sintering, de- ester, pore-forming, continuous burning, heat preservation, soaking process；It is selection solid lubricant, alloy powder and pore creating material respectively, adopts
Selected raw material is mixed in proportion with batch mixer, it, will be at using vacuum sintering furnace using molding machine by hybrid particles compression moulding
Type body high temperature sintering, separates pore creating material during the sintering process, leaves after pore creating material is taken away by vacuum on alloy body surface more
Sinter is immersed in fluid lubricant by kenenchyma after sintered heat insulating is come out of the stove, and is made to be sintered in hole and is penetrated into liquid profit naturally
Lubrication prescription.
2. a kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process according to claim 1, it is characterised in that:
The solid lubricant that raw material used in the sorting is made of boron nitride, graphite, the alloy being made of copper, iron, zinc, tin, nickel
Powder, by the pore creating material based on polymethyl methacrylate, the pore creating material is commonly called as organic glass.
3. a kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process according to claim 1, it is characterised in that:
The fineness of the solid lubricant particle is more than 5000 mesh；The copper, iron, nickel fineness more than 300 mesh, the zinc and tin
Fineness more than 200 mesh；The fineness of the poly methyl methacrylate particle is more than 200 mesh.
4. a kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process according to claim 1, it is characterised in that:
The hybrid technique is stirred 3 hours after being mixed raw mixture in proportion using batch mixer；The moulding process is to use
Molding machine is by raw mixture compression moulding.
5. a kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process according to claim 1, it is characterised in that:
The sintering, de- ester, pore-forming technique are to be burnt the high temperature that the mixture of compression moulding carries out 500 DEG C or so using vacuum sintering furnace
Knot, heat preservation make its vacuum degreasing, vacuum degree 6.7X10 in 2 hours-3, make polymethyl methacrylate in mixture by vacuum and
High temperature is allowed to gasify, and is taken away by vacuum, makes to form porous organization inside sintered surface.
6. a kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process according to claim 1, it is characterised in that:
Mixture is continuously heating to be sintered in vacuum sintering furnace by the continuous burning, heat preservation method, and temperature is controlled at 1050 DEG C, is then protected
Temperature is come out of the stove after 2.5 hours.
7. a kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process according to claim 1, it is characterised in that:
The soaking technology is to have formed the sinter of porous organization after coming out of the stove to be put into external-heat heating in vacuum tank body, works as vacuum degree
The 6.7X10 to reach capacity-1When, then silicone oil is put into the inside of tank body by valve, sinter is impregnated wherein, is kept for 3 hours
After take out, make self-assembling formation fluid lubricant in sinter surface hole defect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910175017.3A CN110076343A (en) | 2019-03-08 | 2019-03-08 | A kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910175017.3A CN110076343A (en) | 2019-03-08 | 2019-03-08 | A kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process |
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| CN110076343A true CN110076343A (en) | 2019-08-02 |
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| CN201910175017.3A Withdrawn CN110076343A (en) | 2019-03-08 | 2019-03-08 | A kind of porous oil-containing bimetallic anti-attrition self-lubricating bearing sintering process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111085687A (en) * | 2019-11-01 | 2020-05-01 | 嘉善欧本轴承有限公司 | Self-lubricating composite material and production process thereof |
| CN113351862A (en) * | 2021-06-07 | 2021-09-07 | 安徽工业大学 | Iron-based bearing material with in-situ pore forming and lubrication enhancement functions and preparation method thereof |
| CN115106531A (en) * | 2022-07-04 | 2022-09-27 | 嘉善华承无油轴承有限公司 | Sintering process of bimetallic bearing |
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| CN111085687A (en) * | 2019-11-01 | 2020-05-01 | 嘉善欧本轴承有限公司 | Self-lubricating composite material and production process thereof |
| CN113351862A (en) * | 2021-06-07 | 2021-09-07 | 安徽工业大学 | Iron-based bearing material with in-situ pore forming and lubrication enhancement functions and preparation method thereof |
| CN113351862B (en) * | 2021-06-07 | 2022-03-18 | 安徽工业大学 | In-situ hole-making and lubrication-enhanced iron-based bearing material and preparation method thereof |
| CN115106531A (en) * | 2022-07-04 | 2022-09-27 | 嘉善华承无油轴承有限公司 | Sintering process of bimetallic bearing |
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