CN115106531B - Sintering process of bimetal bearing - Google Patents
Sintering process of bimetal bearing Download PDFInfo
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- CN115106531B CN115106531B CN202210782250.XA CN202210782250A CN115106531B CN 115106531 B CN115106531 B CN 115106531B CN 202210782250 A CN202210782250 A CN 202210782250A CN 115106531 B CN115106531 B CN 115106531B
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- 238000005245 sintering Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000463 material Substances 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 18
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 17
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 claims description 17
- 238000002425 crystallisation Methods 0.000 claims description 15
- 230000008025 crystallization Effects 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910002804 graphite Inorganic materials 0.000 claims description 10
- 239000010439 graphite Substances 0.000 claims description 10
- -1 polyethylene terephthalate Polymers 0.000 claims description 10
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 10
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000314 lubricant Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 description 12
- 238000009740 moulding (composite fabrication) Methods 0.000 description 12
- 239000003921 oil Substances 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 4
- 239000002671 adjuvant Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
-
- 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
-
- 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
- B22F3/1017—Multiple heating or additional steps
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention relates to the technical field of bearing manufacturing, in particular to a bimetallic bearing sintering process.
Description
Technical Field
The invention relates to the technical field of bearing manufacturing, in particular to a bimetallic bearing sintering process.
Background
The bimetal bearing is one of oil-free lubrication bearings, and is particularly suitable for occasions such as medium speed and medium load, low speed and high load. Various oil grooves, oil holes and oil holes can be processed on the friction surface by a special process means, so that the friction surface is suitable for use under different lubrication conditions. The product is widely applied to the fields of automobile engines, chassis, motorcycle clutches, gear pump rubbing plates, lifting equipment and the like.
The patent application No. CN201910175017.3 discloses a porous oil-containing bimetal antifriction self-lubricating bearing sintering process, which comprises the processes of material selection, mixing, forming, sintering, de-esterification, pore forming, continuous sintering, heat preservation and soaking; respectively selecting a solid lubricant, alloy powder and a pore-forming agent, mixing the selected raw materials in proportion by adopting a mixer, pressing and forming the mixed particles by adopting a forming machine, sintering the formed product at high temperature by adopting a vacuum sintering furnace, separating the pore-forming agent in the sintering process, leaving a multi-hollow structure on the surface of an alloy body after the pore-forming agent is vacuumized, and soaking the sintered product in the liquid lubricant after sintering and heat preservation, so that the liquid lubricant is naturally permeated into sintering holes; according to the sintering process of the porous oil-containing bimetal antifriction self-lubricating bearing, a specific raw material formula is selected, and according to a specified sintering process, the surface of the bimetal bearing is formed into a self-lubricating low-resistance film with antifriction performance, so that the wear resistance of the bearing is improved, and the service life is prolonged.
In summary, developing a sintering process for a bimetallic bearing is still a critical problem to be solved in the technical field of bearing manufacturing.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a bimetallic bearing sintering process, and the method provided by the invention has the advantages that auxiliary materials are prepared, mixed and pressed into a prefabricated bearing with copper-iron alloy powder, and the prefabricated bearing is sintered in three stages to obtain the sintered bimetallic bearing, so that the bimetallic bearing has good hardness and excellent wear resistance.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a bimetallic bearing sintering process, which comprises the following steps:
(1) Preparing auxiliary materials: stirring 80-mesh polyethylene terephthalate at a rotation speed of 12000r/min for 10-12min, adding 100-mesh graphite, and stirring at a rotation speed of 18000r/min for 20-24min to obtain auxiliary materials;
(2) And (3) bearing forming: taking copper-iron alloy powder and auxiliary materials, placing the copper-iron alloy powder and the auxiliary materials into a mixer, adding 2% of lubricant, stirring and mixing uniformly, moving into a mould, adopting a forming machine to press and form mixed particles, and taking out the prefabricated bearing;
(3) Sintering in a first stage: placing the prefabricated bearing in a vacuum sintering furnace, heating from room temperature to crystallization temperature, and preserving heat for 180min at the crystallization temperature;
(4) And (3) sintering in the second stage: heating the vacuum sintering furnace to the sintering temperature at the heating rate of 60-80 ℃/h, and preserving the temperature at the sintering temperature for 80min;
(5) And (3) sintering in a third stage: and cooling the vacuum sintering furnace to room temperature, taking out the prefabricated bearing, and completing sintering of the bimetal bearing.
The invention is further provided with: in the step (1), the mass ratio of polyethylene terephthalate to graphite in the auxiliary materials is 1:1.2.
The invention is further provided with: in the step (2), the fineness of the copper-iron alloy powder is 300-400 meshes.
The invention is further provided with: in the step (2), the rotating speed of the mixer is 300-400r/min, and the stirring time is 1-2h.
The invention is further provided with: in the step (2), after the prefabricated bearing is taken out, the prefabricated bearing is placed for 30-40min under the environment of 45 ℃.
The invention is further provided with: in the step (3), the temperature rising speed is 50-80 ℃/h.
The invention is further provided with: in step (3), the crystallization temperature is 280-320 ℃.
The invention is further provided with: in the step (4), the sintering temperature is 380-410 ℃.
Advantageous effects
Compared with the prior art, the technical proposal provided by the invention has the following advantages that
The beneficial effects are that:
according to the method provided by the invention, the auxiliary materials are prepared, the auxiliary materials and the copper-iron alloy powder are mixed and pressed into the prefabricated bearing, and the prefabricated bearing is sintered in three sections to obtain the sintered bimetal bearing, so that the bimetal bearing has good hardness, excellent wear resistance and wide application prospect, and is worthy of popularization.
Drawings
FIG. 1 is a statistical chart of the hardness of a bimetallic bearing in a performance experiment in the present invention;
FIG. 2 is a statistical chart of the wear amount of the bimetallic bearing in the experiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is further described below with reference to examples.
Example 1:
the invention provides a bimetallic bearing sintering process, which comprises the following steps:
(1) Preparing auxiliary materials: the 80-mesh polyethylene terephthalate is prepared in the following steps
Stirring at 12000r/min for 10min, adding 100 mesh graphite, and stirring at 18000r/min for 20min to obtain adjuvant.
Further, the mass ratio of polyethylene terephthalate to graphite in the auxiliary materials is 1:1.2.
(2) And (3) bearing forming: and (3) taking copper-iron alloy powder and auxiliary materials, placing the copper-iron alloy powder and the auxiliary materials into a mixer, adding 2% of lubricant, stirring and mixing uniformly, moving the mixture into a die, and taking out the prefabricated bearing after the mixed particles are pressed and molded by a molding machine.
Further, the fineness of the copper-iron alloy powder was 300 mesh.
Further, the rotational speed of the mixer was 300r/min, and the stirring time was 1h.
Further, after taking out the prefabricated bearing, the prefabricated bearing is placed in an environment with a temperature of 45 ℃ for 30min.
(3) Sintering in a first stage: and placing the prefabricated bearing in a vacuum sintering furnace, heating from room temperature to a crystallization temperature, and preserving heat for 180min at the crystallization temperature.
Further, the temperature rising rate was 50℃per hour.
Further, the crystallization temperature was 280 ℃.
(4) And (3) sintering in the second stage: the vacuum sintering furnace is heated to the sintering temperature at the heating rate of 60 ℃/h, and the temperature is kept at the sintering temperature for 80min.
Further, the sintering temperature was 380 ℃.
(5) And (3) sintering in a third stage: and cooling the vacuum sintering furnace to room temperature, taking out the prefabricated bearing, and completing sintering of the bimetal bearing.
Example 2:
the invention provides a bimetallic bearing sintering process, which comprises the following steps:
(1) Preparing auxiliary materials: the 80-mesh polyethylene terephthalate is prepared in the following steps
Stirring at 12000r/min for 11min, adding 100 mesh graphite, and stirring at 18000r/min for 202min to obtain adjuvant.
Further, the mass ratio of polyethylene terephthalate to graphite in the auxiliary materials is 1:1.2.
(2) And (3) bearing forming: and (3) taking copper-iron alloy powder and auxiliary materials, placing the copper-iron alloy powder and the auxiliary materials into a mixer, adding 2% of lubricant, stirring and mixing uniformly, moving the mixture into a die, and taking out the prefabricated bearing after the mixed particles are pressed and molded by a molding machine.
Further, the fineness of the copper-iron alloy powder is 350 mesh.
Further, the rotational speed of the mixer is 350r/min, and the stirring time is 2h.
Further, after taking out the prefabricated bearing, the prefabricated bearing is placed in an environment with a temperature of 45 ℃ for 35min.
(3) Sintering in a first stage: and placing the prefabricated bearing in a vacuum sintering furnace, heating from room temperature to a crystallization temperature, and preserving heat for 180min at the crystallization temperature.
Further, the temperature rising rate was 65℃per hour.
Further, the crystallization temperature was 300 ℃.
(4) And (3) sintering in the second stage: the vacuum sintering furnace is heated to the sintering temperature at the heating rate of 70 ℃/h, and the temperature is kept at the sintering temperature for 80min.
Further, the sintering temperature was 395 ℃.
(5) And (3) sintering in a third stage: and cooling the vacuum sintering furnace to room temperature, taking out the prefabricated bearing, and completing sintering of the bimetal bearing.
Example 3:
the invention provides a bimetallic bearing sintering process, which comprises the following steps:
(1) Preparing auxiliary materials: the 80-mesh polyethylene terephthalate is prepared in the following steps
Stirring at 12000r/min for 12min, adding 100 mesh graphite, and stirring at 18000r/min for 24min to obtain adjuvant.
Further, the mass ratio of polyethylene terephthalate to graphite in the auxiliary materials is 1:1.2.
(2) And (3) bearing forming: and (3) taking copper-iron alloy powder and auxiliary materials, placing the copper-iron alloy powder and the auxiliary materials into a mixer, adding 2% of lubricant, stirring and mixing uniformly, moving the mixture into a die, and taking out the prefabricated bearing after the mixed particles are pressed and molded by a molding machine.
Further, the fineness of the copper-iron alloy powder is 400 mesh.
Further, the rotational speed of the mixer is 400r/min, and the stirring time is 2h.
Further, after taking out the prefabricated bearing, the prefabricated bearing is placed in an environment with a temperature of 45 ℃ for 40min.
(3) Sintering in a first stage: and placing the prefabricated bearing in a vacuum sintering furnace, heating from room temperature to a crystallization temperature, and preserving heat for 180min at the crystallization temperature.
Further, the temperature rising rate was 80℃per hour.
Further, the crystallization temperature was 320 ℃.
(4) And (3) sintering in the second stage: the vacuum sintering furnace is heated to the sintering temperature at the heating rate of 80 ℃/h, and the temperature is kept at the sintering temperature for 80min.
Further, the sintering temperature was 410 ℃.
(5) And (3) sintering in a third stage: and cooling the vacuum sintering furnace to room temperature, taking out the prefabricated bearing, and completing sintering of the bimetal bearing.
And (3) performance detection:
bimetallic bearings were prepared according to the methods of example 1, example 2 and example 3, respectively, as experiment 1 group, experiment 2 group and experiment 3 group, and then the prepared bimetallic bearings were used as control group by the method of patent application number CN 201910175017.3.
(1) The hardness of each group of bimetallic bearings was measured using an HBS-3000 digital brinell hardness tester, and the data of each group of experiments were recorded in table 1.
Table 1 data record table for each set of experiments
As can be seen from Table 1 and FIG. 1, the hardness of the bimetallic bearings of the experimental groups (experimental group 1, experimental group 2 and experimental group 3) was significantly better than that of the control group (p < 0.05), while the hardness difference of the bimetallic bearings between the experimental groups was not significant (p > 0.05). The sintering process of the bimetal bearing provided by the invention can effectively improve the hardness of the bimetal bearing.
(2) The wear (g) of each group of bimetal bearings was measured by using a frictional wear tester, and the data of each group of experiments was recorded in table 2.
Table 2 data record table for each set of experiments
| Group of | n | Wearing capacity (g) |
| Experiment 1 group | 10 | 7.2×10 -3 |
| Experiment 2 group | 10 | 7.5×10 -3 |
| Experiment 3 group | 10 | 7.8×10 -3 |
| Control group | 10 | 9.5×10 -3 |
As can be seen from fig. 2 and table 2, the bimetallic bearings of the experimental groups (experimental group 1, experimental group 2 and experimental group 3) have significantly lower wear amounts than those of the control group (p < 0.05), and the bimetallic bearings of the respective groups have no significant difference in wear amounts (p > 0.05) as compared with the control group. The sintering process of the bimetal bearing provided by the invention can effectively improve the wear resistance of the bimetal bearing.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The sintering process of the bimetallic bearing is characterized by comprising the following steps of:
(1) Preparing auxiliary materials: stirring 80-mesh polyethylene terephthalate at a rotation speed of 12000r/min for 10-12min, adding 100-mesh graphite, and stirring at a rotation speed of 18000r/min for 20-24min to obtain auxiliary materials;
(2) And (3) bearing forming: taking copper-iron alloy powder and auxiliary materials, placing the copper-iron alloy powder and the auxiliary materials into a mixer, adding 2% of lubricant, stirring and mixing uniformly, moving into a mould, adopting a forming machine to press and form mixed particles, and taking out the prefabricated bearing;
(3) Sintering in a first stage: placing the prefabricated bearing in a vacuum sintering furnace, heating from room temperature to crystallization temperature, and preserving heat for 180min at the crystallization temperature;
the heating rate is 50-80 ℃/h;
the crystallization temperature is 280-320 ℃;
(4) And (3) sintering in the second stage: heating the vacuum sintering furnace to the sintering temperature at the heating rate of 60-80 ℃/h, and preserving the temperature at the sintering temperature for 80min;
the sintering temperature is 380-410 ℃;
(5) And (3) sintering in a third stage: and cooling the vacuum sintering furnace to room temperature, taking out the prefabricated bearing, and completing sintering of the bimetal bearing.
2. The sintering process of the bimetal bearing according to claim 1, wherein in the step (1), the mass ratio of polyethylene terephthalate to graphite in the auxiliary material is 1:1.2.
3. The sintering process of a bimetal bearing according to claim 1, wherein in the step (2), the fineness of the copper-iron alloy powder is 300-400 mesh.
4. The sintering process of the bimetal bearing according to claim 1, wherein in the step (2), the rotating speed of the mixer is 300-400r/min, and the stirring time is 1-2h.
5. The sintering process of a bimetal bearing according to claim 1, wherein in the step (2), after the preformed bearing is taken out, the preformed bearing is left for 30-40min in an environment of 45 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210782250.XA CN115106531B (en) | 2022-07-04 | 2022-07-04 | Sintering process of bimetal bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210782250.XA CN115106531B (en) | 2022-07-04 | 2022-07-04 | Sintering process of bimetal bearing |
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| CN115106531B true CN115106531B (en) | 2024-01-05 |
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| JP6817094B2 (en) * | 2016-07-29 | 2021-01-20 | 株式会社ダイヤメット | Iron-copper-based sintered oil-impregnated bearing and its manufacturing method |
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| CN115106531A (en) | 2022-09-27 |
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