CN115106531A - Sintering process of bimetallic bearing - Google Patents
Sintering process of bimetallic bearing Download PDFInfo
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- CN115106531A CN115106531A CN202210782250.XA CN202210782250A CN115106531A CN 115106531 A CN115106531 A CN 115106531A CN 202210782250 A CN202210782250 A CN 202210782250A CN 115106531 A CN115106531 A CN 115106531A
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- 238000005245 sintering Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000003756 stirring Methods 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 18
- 238000002425 crystallisation Methods 0.000 claims description 15
- 230000008025 crystallization Effects 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 11
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 11
- 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
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000314 lubricant Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 5
- 239000002671 adjuvant Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229920001223 polyethylene glycol Polymers 0.000 claims description 5
- -1 polyethylene terephthalate Polymers 0.000 claims description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 5
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 5
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910017827 Cu—Fe Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 description 10
- 239000003921 oil Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000010687 lubricating oil Substances 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
- 238000005238 degreasing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
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
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- 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 sintering process of a bimetallic bearing.
Background
The bimetallic bearing is one of oil-free lubrication bearings, and is particularly suitable for occasions of medium-speed and medium-load, low-speed and high-load and the like. By means of special technological process, various oil grooves, oil holes and oil holes may be machined on the friction surface to adapt to different lubricating conditions. The product is widely applied to the fields of automobile engines, chassis, motorcycle clutches, gear pump wiping plates, hoisting equipment and the like.
The patent of 'a porous oil-containing bimetal antifriction self-lubricating bearing sintering process' with the patent application number of CN201910175017.3, which is described in the specification and comprises the processes of material selection, mixing, molding, sintering, degreasing, pore forming, continuous firing, heat preservation and soaking; selecting a solid lubricant, alloy powder and a pore-forming agent, mixing the selected raw materials in proportion by using a mixer, pressing and forming the mixed particles by using a forming machine, sintering the formed body at high temperature by using a vacuum sintering furnace, separating the pore-forming agent in the sintering process, leaving a porous structure on the surface of the alloy body after the pore-forming agent is vacuumed, and soaking a sinter in a liquid lubricant after sintering, keeping the temperature and discharging from the furnace so as to enable the liquid lubricant to naturally permeate into sintering holes; according to the sintering process of the porous oil-containing bimetallic antifriction self-lubricating bearing, a specific raw material formula is selected and a specified sintering process is adopted, so that a self-lubricating low-resistance film with antifriction performance is formed on the surface of the bimetallic bearing, the wear resistance of the bearing is improved, and the service life of the bearing is prolonged.
In summary, the research and development of a sintering process for a bimetallic bearing is still a key problem to be solved urgently in the technical field of bearing manufacturing.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a bimetallic bearing sintering process, and the method provided by the invention is characterized in that auxiliary materials are prepared, the auxiliary materials and copper-iron alloy powder are mixed and pressed into a prefabricated bearing, and the prefabricated bearing is sintered in a three-stage mode to obtain the sintered bimetallic bearing, so that the sintered bimetallic bearing not only has good hardness performance, but also has excellent wear resistance.
In order to realize the purpose, the invention provides the following technical scheme:
the invention provides a bimetallic bearing sintering process, which comprises the following steps:
(1) preparing auxiliary materials: stirring 80-mesh polyethylene glycol terephthalate at 12000r/min for 10-12min, adding 100-mesh graphite, and stirring at 18000r/min for 20-24min to obtain adjuvant;
(2) forming a bearing: taking copper-iron alloy powder, placing the powder into a mixer, adding 2% of lubricant, stirring and mixing uniformly, moving the mixture into a mold, pressing and molding the mixed particles by using a molding machine, 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) second-stage sintering: heating the vacuum sintering furnace to the sintering temperature at the heating rate of 60-80 ℃/h, and preserving the heat at the sintering temperature for 80 min;
(5) and (3) third-stage sintering: and cooling the vacuum sintering furnace to room temperature, taking out the prefabricated bearing, and completing the sintering of the bimetallic bearing.
The invention is further configured to: in the step (1), the mass ratio of the polyethylene terephthalate to the graphite in the auxiliary material is 1: 1.2.
The invention is further configured to: in the step (2), the fineness of the copper-iron alloy powder is 300-400 meshes.
The invention is further configured to: in the step (2), the rotation speed of the mixer is 300-.
The invention is further configured to: in the step (2), after the prefabricated bearing is taken out, the prefabricated bearing is placed for 30-40min in an environment with the temperature of 45 ℃.
The invention is further configured to: in the step (3), the temperature rise speed is 50-80 ℃/h.
The invention is further configured to: in the step (3), the crystallization temperature is 280-320 ℃.
The invention is further configured to: in the step (4), the sintering temperature is 380-410 ℃.
Advantageous effects
Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:
according to the method provided by the invention, the auxiliary material is prepared, the auxiliary material and the copper-iron alloy powder are mixed and pressed into the prefabricated bearing, and the prefabricated bearing is sintered in a three-stage manner to obtain the sintered bimetallic bearing, so that the sintered bimetallic bearing not only has good hardness performance, but also has excellent wear resistance, wide application prospect and is worthy of popularization.
Drawings
FIG. 1 is a statistical plot of bimetallic bearing hardness in performance experiments in accordance with the present invention;
FIG. 2 is a statistical chart of the wear loss of the bimetallic bearing in the performance test of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all 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.
The present invention will be further described with reference to the following examples.
Example 1:
the invention provides a bimetallic bearing sintering process, which comprises the following steps:
(1) preparing auxiliary materials: stirring 80-mesh polyethylene glycol terephthalate at 12000r/min for 10min, adding 100-mesh graphite, and stirring at 18000r/min for 20min to obtain adjuvant.
Furthermore, the mass ratio of the polyethylene terephthalate to the graphite in the auxiliary materials is 1: 1.2.
(2) Forming a bearing: taking copper-iron alloy powder, placing the powder into a mixer, adding 2% of lubricant, stirring and mixing uniformly, moving the mixture into a mold, pressing and molding the mixed particles by a molding machine, and taking out the prefabricated bearing.
Further, the fineness of the copper-iron alloy powder is 300 meshes.
Further, the rotating speed of the mixer is 300r/min, and the stirring time is 1 h.
Further, after taking out the prefabricated bearing, the prefabricated bearing is placed for 30min in an environment with the temperature of 45 ℃.
(3) Sintering in a first stage: and (3) 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 rise rate was 50 ℃/h.
Further, the crystallization temperature was 280 ℃.
(4) And (3) second-stage sintering: and (3) heating the vacuum sintering furnace to the sintering temperature at the heating rate of 60 ℃/h, and preserving the heat at the sintering temperature for 80 min.
Further, the sintering temperature was 380 ℃.
(5) And (3) third-stage sintering: and cooling the vacuum sintering furnace to room temperature, taking out the prefabricated bearing, and completing the sintering of the bimetallic bearing.
Example 2:
the invention provides a bimetallic bearing sintering process, which comprises the following steps:
(1) preparing auxiliary materials: stirring 80-mesh polyethylene glycol terephthalate at 12000r/min for 11min, adding 100-mesh graphite, and stirring at 18000r/min for 202min to obtain adjuvant.
Furthermore, the mass ratio of the polyethylene terephthalate to the graphite in the auxiliary materials is 1: 1.2.
(2) Forming a bearing: taking copper-iron alloy powder, placing the powder into a mixer, adding 2% of lubricant, stirring and mixing uniformly, moving the mixture into a mold, pressing and molding the mixed particles by a molding machine, and taking out the prefabricated bearing.
Further, the fineness of the copper-iron alloy powder is 350 meshes.
Further, the rotating speed of the mixer is 350r/min, and the stirring time is 2 h.
Further, after taking out the prefabricated bearing, the prefabricated bearing is placed for 35min in an environment with the temperature of 45 ℃.
(3) Sintering in a first stage: and (3) 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.
Further, the temperature rise rate was 65 ℃/h.
Further, the crystallization temperature was 300 ℃.
(4) And (3) second-stage sintering: and (3) heating the vacuum sintering furnace to the sintering temperature at the heating rate of 70 ℃/h, and preserving the heat at the sintering temperature for 80 min.
Further, the sintering temperature was 395 ℃.
(5) And (3) third-stage sintering: and cooling the vacuum sintering furnace to room temperature, taking out the prefabricated bearing, and completing the sintering of the bimetallic bearing.
Example 3:
the invention provides a bimetallic bearing sintering process, which comprises the following steps:
(1) preparing auxiliary materials: stirring 80-mesh polyethylene glycol terephthalate at 12000r/min for 12min, adding 100-mesh graphite, and stirring at 18000r/min for 24min to obtain adjuvant.
Furthermore, the mass ratio of the polyethylene terephthalate to the graphite in the auxiliary materials is 1: 1.2.
(2) Forming a bearing: taking copper-iron alloy powder, placing the powder into a mixer, adding 2% of lubricant, stirring and mixing uniformly, moving the mixture into a mold, pressing and molding the mixed particles by a molding machine, and taking out the prefabricated bearing.
Further, the fineness of the copper-iron alloy powder is 400 meshes.
Furthermore, the rotating speed of the mixer is 400r/min, and the stirring time is 2 h.
Further, after taking out the prefabricated bearing, the prefabricated bearing is placed for 40min in an environment with the temperature of 45 ℃.
(3) Sintering in a first stage: and (3) 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 rise rate was 80 ℃ per hour.
Further, the crystallization temperature was 320 ℃.
(4) And (3) second-stage sintering: and (3) heating the vacuum sintering furnace to the sintering temperature at the heating rate of 80 ℃/h, and preserving the heat at the sintering temperature for 80 min.
Further, the sintering temperature was 410 ℃.
(5) And (3) third-stage sintering: and cooling the vacuum sintering furnace to room temperature, taking out the prefabricated bearing, and completing the sintering of the bimetallic bearing.
And (3) performance detection:
bimetallic bearings prepared according to the methods of example 1, example 2 and example 3 were used as experimental 1, experimental 2 and experimental 3 groups, respectively, and the method of patent application No. CN201910175017.3 was used as a control group.
(1) The hardness of each set of bimetallic bearings was measured using an HBS-3000 digital display brinell hardness tester, and the data of each set of experiments was recorded in table 1.
TABLE 1 data record of each set of experiments
| Group of | n | Hardness (HB) |
| Experiment 1 group | 8 | 250 |
| Experiment 2 groups | 8 | 245 |
| Experiment 3 groups | 8 | 248 |
| Control group | 8 | 205 |
As can be seen from table 1 and fig. 1, the hardness of the bimetal bearings of the experimental groups (experimental 1 group, experimental 2 group, and experimental 3 group) was significantly superior to that of the control group (p < 0.05), and the difference in hardness of the bimetal bearings between the experimental groups was not significant (p > 0.05), compared to the control group. The sintering process of the bimetallic bearing provided by the invention can effectively improve the hardness of the bimetallic bearing.
(2) The wear (g) of each set of the bimetallic bearings was measured by a friction wear tester, and the data of each set of the test was recorded in table 2.
TABLE 2 data record of each set of experiments
| Group of | n | Amount of wear (g) |
| Experiment 1 group | 10 | 7.2×10 -3 |
| Experiment 2 groups | 10 | 7.5×10 -3 |
| Experiment 3 groups | 10 | 7.8×10 -3 |
| Control group | 10 | 9.5×10 -3 |
As can be seen from fig. 2 and table 2, the bimetal bearings of the experimental groups (experimental 1 group, experimental 2 group and experimental 3 group) had significantly lower wear amounts than those of the control group (p < 0.05), and the bimetal bearings of the respective groups did not differ significantly in wear amount (p > 0.05) as compared to the control group. The sintering process of the bimetallic bearing provided by the invention can effectively improve the wear resistance of the bimetallic bearing.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (8)
1. The sintering process of the bimetallic bearing is characterized by comprising the following steps of:
(1) preparing auxiliary materials: stirring 80-mesh polyethylene glycol terephthalate at 12000r/min for 10-12min, adding 100-mesh graphite, and stirring at 18000r/min for 20-24min to obtain adjuvant;
(2) forming a bearing: taking copper-iron alloy powder, placing the powder into a mixer, adding 2% of lubricant, stirring and mixing uniformly, moving the mixture into a mold, pressing and molding the mixed particles by using a molding machine, 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) second-stage sintering: heating the vacuum sintering furnace to the sintering temperature at the heating rate of 60-80 ℃/h, and preserving the heat at the sintering temperature for 80 min;
(5) and (3) third-stage sintering: and cooling the vacuum sintering furnace to room temperature, taking out the prefabricated bearing, and completing the sintering of the bimetallic bearing.
2. The bimetallic bearing sintering process of claim 1, wherein in step (1), the mass ratio of polyethylene terephthalate to graphite in the auxiliary material is 1: 1.2.
3. The sintering process for bimetallic bearing as claimed in claim 1, wherein in step (2), the fineness of the Cu-Fe alloy powder is 300-400 mesh.
4. The sintering process of claim 1, wherein in step (2), the rotation speed of the mixer is 300-400r/min, and the stirring time is 1-2 h.
5. The bimetallic bearing sintering process of claim 1, wherein in step (2), after the preformed bearing is removed, the preformed bearing is placed in an environment having a temperature of 45 ℃ for 30-40 min.
6. The process for sintering a bimetallic bearing as in claim 1, wherein in step (3), said temperature rise rate is 50-80 ℃/h.
7. The sintering process for bimetallic bearing as claimed in claim 1, wherein in step (3), the crystallization temperature is 280-320 ℃.
8. The process for sintering a bimetallic bearing as claimed in claim 1, wherein in step (4), the sintering temperature is 380-410 ℃.
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 |
Applications Claiming Priority (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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| CN115106531A true CN115106531A (en) | 2022-09-27 |
| CN115106531B CN115106531B (en) | 2024-01-05 |
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| CN115106531B (en) | 2024-01-05 |
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