CN106505397A - A kind of preparation method of passenger car start and stop carbon brush used for electric engine - Google Patents
A kind of preparation method of passenger car start and stop carbon brush used for electric engine Download PDFInfo
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- CN106505397A CN106505397A CN201510564440.4A CN201510564440A CN106505397A CN 106505397 A CN106505397 A CN 106505397A CN 201510564440 A CN201510564440 A CN 201510564440A CN 106505397 A CN106505397 A CN 106505397A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 109
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- 239000000843 powder Substances 0.000 claims abstract description 213
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 121
- 239000000463 material Substances 0.000 claims abstract description 112
- 229910052802 copper Inorganic materials 0.000 claims abstract description 83
- 239000010949 copper Substances 0.000 claims abstract description 83
- 239000000084 colloidal system Substances 0.000 claims abstract description 81
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 46
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000005011 phenolic resin Substances 0.000 claims abstract description 26
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 26
- 239000002006 petroleum coke Substances 0.000 claims abstract description 25
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 21
- 239000010439 graphite Substances 0.000 claims abstract description 21
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 54
- 239000000203 mixture Substances 0.000 claims description 40
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 38
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 38
- 238000005245 sintering Methods 0.000 claims description 35
- 238000003825 pressing Methods 0.000 claims description 31
- 238000001035 drying Methods 0.000 claims description 9
- 238000004049 embossing Methods 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract 2
- 229910052750 molybdenum Inorganic materials 0.000 abstract 2
- 239000011733 molybdenum Substances 0.000 abstract 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 28
- 238000012360 testing method Methods 0.000 description 26
- 239000002994 raw material Substances 0.000 description 18
- 229910052739 hydrogen Inorganic materials 0.000 description 14
- 239000001257 hydrogen Substances 0.000 description 14
- 229910052757 nitrogen Inorganic materials 0.000 description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 13
- 238000012545 processing Methods 0.000 description 13
- 238000001816 cooling Methods 0.000 description 12
- 230000000704 physical effect Effects 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 238000010998 test method Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
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Abstract
The invention provides a kind of preparation method of passenger car start and stop carbon brush used for electric engine, including graphite, phenolic resin, tungsten disulfide, petroleum coke and acetone to be well mixed, is obtained colloid powder；The colloid powder, copper powder and molybdenum bisuphide are well mixed, high copper feed powder is obtained；The colloid powder, copper powder and molybdenum bisuphide are well mixed, low copper containing amount feed powder is obtained；The high copper feed powder is put in the mould, again the low copper containing amount feed powder is put on the high copper feed powder in the mould, then copper soft whipping wire is inserted within the high copper feed powder via the low copper containing amount feed powder in the mould, compression process is carried out to which, carbon brush pressed compact is obtained；The carbon brush pressed compact is sintered, carbon brush first product is obtained；Grinding process is carried out to the brush first product, carbon brush finished product is obtained.The present invention is by suppressing after will be compound to the high copper bed of material and the low copper containing amount bed of material so that the passenger car start and stop carbon brush used for electric engine service life of preparation is greatly improved.
Description
Technical Field
The invention relates to a preparation method of a carbon brush for a passenger vehicle start-stop motor, and belongs to the field of electric carbon.
Background
Passenger vehicles are vehicles which, in terms of their design and technical characteristics, are used primarily for carrying passengers and their carry-on luggage or temporary objects, including passenger cars, minibuses and no more than nine light buses. With the improvement of the living standard of people and the popularization of automobiles in modern society, various requirements of people on passenger cars are higher and higher. Various motors are arranged in the automobile, so that a user can conveniently operate various systems of the car.
The passenger car start-stop system is a set of system which automatically stops when a car is temporarily stopped (for example, waiting for a red light) in the running process of the car, and automatically restarts an engine when the car needs to go forward continuously. When the engine is restarted, the starter (start-stop motor) needs to work again. Because the starting is frequently and frequently carried out, the carbon brush for the starting and stopping motor has high loss, and the requirement on the service life of the carbon brush is longer than that of the conventional carbon brush for the motor. The service life of the conventional motor carbon brush is 3.5 ten thousand times, and the service life of the carbon brush for the start-stop motor is more than 25 ten thousand times. The carbon brush for the start-stop motor is based on the requirement of the carbon brush for the start-stop motor on the service life, and the wear resistance and the service life of the carbon brush are improved. The carbon brush body is pressed by two components, one is a high copper content material layer, the other is a low copper content material layer, and the two layers are compounded to achieve the purposes of increasing lubrication, reducing friction and prolonging service life.
Disclosure of Invention
The invention provides a preparation method of a carbon brush for a passenger car start-stop motor, aiming at overcoming the defects in the existing carbon brush technology for the passenger car start-stop motor.
The invention provides a preparation method of a carbon brush for a passenger vehicle start-stop motor, which comprises the following steps:
uniformly mixing graphite, phenolic resin, tungsten disulfide, petroleum coke and acetone to prepare colloid powder;
uniformly mixing the colloid powder, the copper powder and the molybdenum disulfide to prepare high-copper-content material powder;
uniformly mixing the colloid powder, the copper powder and the molybdenum disulfide to prepare low-copper-content material powder;
respectively adding the high-copper-content material powder and the low-copper-content material powder into a pressing mold, and pressing the materials to obtain a carbon brush pressed blank;
sintering the carbon brush pressed compact to obtain a carbon brush primary product;
grinding the primary electric brush product to obtain a finished carbon brush product;
wherein, add the high copper content powder and low copper content powder into the embossing mold utensil respectively and include:
firstly, putting the high-copper-content material powder into the mold;
then putting the low-copper-content material powder on the high-copper-content material powder in the mold;
and then inserting the copper soft stranded wire into the high copper content material powder through the low copper content material powder in the die.
Wherein, the graphite, the phenolic resin, the tungsten disulfide, the petroleum coke and the acetone are uniformly mixed to prepare the colloid powder, and the colloid powder comprises the following components:
uniformly mixing graphite, phenolic resin, tungsten disulfide and petroleum coke to prepare a colloidal powder primary material;
adding acetone into the primary colloid powder material, and uniformly mixing to obtain a colloid powder mixture;
and drying, crushing and sieving the colloid powder mixture to obtain the colloid powder.
Particularly, the weight ratio of the graphite to the phenolic resin to the tungsten disulfide to the petroleum coke to the acetone is 74-78:15-20:2-5:1-5:25-35, and the sum of the weight ratio of the graphite to the phenolic resin to the tungsten disulfide to the petroleum coke is 100.
Particularly, the graphite is in a hexagonal system, is similar to fish scales in shape, is in a layered structure, and has good high-temperature resistance, conductivity and lubrication effects. The graphite is black natural graphite powder, the carbon content is more than or equal to 99%, and the proper graphite is added into the carbon brush, so that the wear resistance of the product can be improved.
Particularly, the proportion of graphite powder with the granularity of less than or equal to 44.5 mu m in the graphite is less than 15 percent, and the proportion of graphite powder with the granularity of 75-150 mu m is 40-80 percent.
In particular, the phenolic resin is yellow powder and is thermosetting phenolic resin, and the particle size is less than 75 mu m; the phenolic resin is carbonized after high-temperature treatment, and the mechanical strength of the product can be improved.
Particularly, the tungsten disulfide is black powder, the content is more than or equal to 99 percent, and the granularity is less than 30 mu m; the friction coefficient of the tungsten disulfide is low, and the wear resistance of the product can be improved.
Particularly, the petroleum coke is black powder, the carbon content is more than or equal to 99 percent, and the granularity is less than 150 mu m; petroleum coke is used as a grinding agent in the carbon brush, so that a uniform protective film can be formed on the surface of the commutator, and the wear resistance of the product is improved.
In particular, the acetone is a colorless transparent liquid and is mainly used as a solvent.
Particularly, the time for uniformly mixing the graphite, the phenolic resin, the tungsten disulfide and the petroleum coke is 10-20 min.
Particularly, acetone is added into the colloidal powder primary material and uniformly mixed for 60 +/-10 min.
Particularly, the drying treatment temperature of the colloid powder mixture is 50-55 ℃, and the time is 10-12 hh.
Particularly, the dried colloidal powder is crushed, and the granularity of the prepared colloidal powder is as follows:
particle size ratio of < 45 μm: less than 15 percent; the particle size ratio of 100-300 μm is as follows: 60 to 80 percent; particle size ratio > 420 μm: is less than 5 percent.
Wherein the weight ratio of the colloid powder, the copper powder and the molybdenum disulfide in the high copper content material powder is 42-47:51-53: 2-5.
Particularly, the copper content of the copper powder is more than or equal to 99.5 percent, the granularity is less than 44.5 mu m, and the loose packed ratio is 0.5-1.0g/cm3。
In particular, the molybdenum disulfide is gray powder, the content is more than 98.5 percent, and the granularity is less than 44.5 mu m; the friction coefficient of the molybdenum disulfide is low, and the wear resistance of the product can be improved.
Particularly, the colloid powder, the copper powder and the molybdenum disulfide are uniformly mixed, and the time for preparing the high-copper-content material powder is 40-60 min.
Wherein the weight ratio of the colloid powder, the copper powder and the molybdenum disulfide in the low-copper-content material powder is 71-75:20-28: 1-5.
Particularly, the copper content of the copper powder is more than or equal to 99.5 percent, the granularity is less than 44.5 mu m, and the loose packed ratio is 0.5-1.0g/cm3。
In particular, the molybdenum disulfide is gray powder, the content is more than 98.5 percent, and the granularity is less than 44.5 mu m; the friction coefficient of the molybdenum disulfide is low, and the wear resistance of the product can be improved.
Particularly, the colloid powder, the copper powder and the molybdenum disulfide are uniformly mixed, and the time for preparing the low-copper-content material powder is 30-40 min.
Particularly, the high copper content material powder layer is 60-70% of the total mixture thickness; the low copper content material powder layer is 30-40% of the total mixture thickness; the wire inserting depth of the copper soft stranded wire is 1/2-2/3 of the total material layer thickness in the die.
And pressing the mixture in the die to obtain a carbon brush pressed blank.
In particular, the unit pressure of the pressing treatment is 3 to 4 tons/cm2。
And sintering the carbon brush pressed compact to obtain a carbon brush primary product.
Particularly, the treatment temperature of the sintering treatment is 500-800 ℃, and the treatment time is 8.5-15 h.
Particularly, the sintering treatment is to sinter the carbon brush pressed compact under the protection of nitrogen and hydrogen, and the proportion of the nitrogen to the hydrogen is 75% to 25%.
And processing the carbon brush finished product on the carbon brush primary product to obtain a carbon brush finished product.
The invention has the advantages and beneficial technical effects as follows:
1. the preparation method of the carbon brush for the passenger car start-stop motor adopts a double-layer composite pressing structure, the two layers have different copper contents, the low copper-containing layer has low friction coefficient, good lubricating property and good wear resistance, the service life of the carbon brush can be prolonged, the high copper-containing layer has low resistivity and good conductivity, the high conductivity of the carbon brush is improved, and the carbon brush for the passenger car start-stop motor with excellent performance is prepared by compounding the two layers.
2. According to the carbon brush for the passenger car start-stop motor, a proper amount of petroleum coke is added when the colloid powder is prepared, so that a uniform lubricating film can be formed on the surface of the motor commutator, and the service life of the carbon brush can be prolonged through the self-lubricating effect of the lubricating film.
3. The carbon brush for the passenger car start-stop motor prepared by the method has excellent performance and the volume density of the carbon brush is 3.15-3.30g/cm3The resistivity is 0.40-0.60 mu omega.m, the Rockwell hardness (HR10/392) is 85-110, the service life is as long as 25-28 ten thousand times, the carbon brush grinding is small, and the power reduction is not more than 10%.
Detailed Description
The invention is illustrated below with reference to examples. The advantages and features of the present invention will become more apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Example 1
1. Preparation of colloidal powder
Preparing raw materials of graphite powder 78, phenolic resin powder 15, tungsten disulfide 2, petroleum coke 5 and acetone 35 according to the weight part ratio, and then mixing the graphite, the phenolic resin, the tungsten disulfide and the petroleum coke for 10min at normal temperature to obtain a colloid powder primary material; then adding acetone into the primary colloid powder material, mixing for 70min, and uniformly mixing to obtain a colloid powder mixture; and finally, drying the colloid powder mixture at the temperature of 50-55 ℃ for 12h, and crushing to obtain the colloid powder.
2. Preparation of high copper content powder
Preparing raw materials of colloid powder 42, copper powder 53 and molybdenum disulfide 5 according to the weight part ratio, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 60min at normal temperature, and uniformly mixing to obtain the high-copper-content material powder.
3. Preparation of a Low copper content powder
Preparing raw materials of colloid powder 71, copper powder 28 and molybdenum disulfide 1 according to the weight part ratio, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 30min at normal temperature, and uniformly mixing to obtain the low-copper-content material powder.
4. Pressing treatment
Firstly, putting the high-copper-content material powder into the mold; then putting the low-copper-content material powder on the high-copper-content material powder in the mold; then, inserting the copper soft stranded wire into the high copper content material powder through the low copper content material powder in the die; wherein, the high copper content material powder layer is 70% of the total mixture thickness; the low copper content material powder layer is 30% of the total mixture thickness; the wire inserting depth of the copper soft stranded wire is 2/3 of the total material layer thickness in the die. Pressing the mixture in the die by adopting pressing equipment to prepare a carbon brush pressed blank, wherein the unit pressure of the pressing treatment is 3 tons/cm2。
5. Sintering and finished product processing
Placing the pressed carbon brush pressed compact into a high-temperature sintering furnace, and sintering under the protection of nitrogen and hydrogen; wherein, the proportion of the nitrogen and the hydrogen is 70 percent to 25 percent; the sintering process conditions are as follows: heating the high-temperature sintering furnace to 800 ℃ within 15h, and cooling to room temperature to obtain a carbon brush primary product; and processing the carbon brush primary product to obtain a finished carbon brush product.
And (3) detecting the physical property indexes of the carbon brush finished product, wherein the detection result is shown in table 1.
The carbon brush finished product is subjected to a working test according to the following test conditions and test methods, the service life and the wear rate of the carbon brush finished product are detected, and the test results are shown in table 2.
Working voltage: 12V; the operation mode is as follows: work for 1.5s, rest for 28.5 s; the test conditions are as follows: air cooling is carried out, and the surface temperature of the motor is not more than 50 ℃.
Example 2
1. Preparation of colloidal powder
Preparing raw materials of graphite powder 76, phenolic resin powder 18, tungsten disulfide 3, petroleum coke 3 and acetone 30 according to the weight part ratio, and then mixing the graphite, the phenolic resin, the tungsten disulfide and the petroleum coke for 15min at normal temperature to obtain a colloid powder primary material; then adding acetone into the primary colloid powder material, mixing for 60min, and uniformly mixing to obtain a colloid powder mixture; and finally, drying the colloid powder mixture for 11h at the temperature of 50-55 ℃, and crushing to obtain the colloid powder.
2. Preparation of high copper content powder
Preparing raw materials including 45 parts of colloid powder, 52 parts of copper powder and 3 parts of molybdenum disulfide according to the weight parts, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 50min at normal temperature, and uniformly mixing to obtain the high-copper-content material powder.
3. Preparation of a Low copper content powder
Preparing raw materials of 73 parts of colloid powder, 25 parts of copper powder and 2 parts of molybdenum disulfide according to the weight parts, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 35min at normal temperature, and uniformly mixing to obtain the low-copper-content material powder.
4. Pressing treatment
Firstly, putting the high-copper-content material powder into the mold; then putting the low-copper-content material powder on the high-copper-content material powder in the mold; then, inserting the copper soft stranded wire into the high copper content material powder through the low copper content material powder in the die; wherein,the high copper content material powder layer is 65% of the total mixture thickness; the low copper content material powder layer is 35% of the total mixture thickness; the wire inserting depth of the copper soft stranded wire is 3/5 of the total material layer thickness in the die. Pressing the mixture in the die by adopting pressing equipment to prepare a carbon brush pressed blank, wherein the unit pressure of the pressing treatment is 3.5 tons/cm2。
5. Sintering and finished product processing
Placing the pressed carbon brush pressed compact into a high-temperature sintering furnace, and sintering under the protection of nitrogen and hydrogen; wherein, the proportion of the nitrogen and the hydrogen is 70 percent to 25 percent; the sintering process conditions are as follows: heating the high-temperature sintering furnace to 700 ℃ within 12h, and cooling to room temperature to obtain a carbon brush primary product; and processing the carbon brush primary product to obtain a finished carbon brush product.
And (3) detecting the physical property indexes of the carbon brush finished product, wherein the detection result is shown in table 1.
The carbon brush finished product is subjected to a working test according to the following test conditions and test methods, the service life and the wear rate of the carbon brush finished product are detected, and the test results are shown in table 2.
Working voltage: 12V; the operation mode is as follows: work for 1.5s, rest for 28.5 s; the test conditions are as follows: air cooling is carried out, and the surface temperature of the motor is not more than 50 ℃.
Example 3
1. Preparation of colloidal powder
Preparing raw materials of 74 parts of graphite powder, 20 parts of phenolic resin powder, 5 parts of tungsten disulfide, 1 part of petroleum coke and 25 parts of acetone, and then mixing the graphite, the phenolic resin, the tungsten disulfide and the petroleum coke for 20min at normal temperature to obtain a colloid powder primary material; then adding acetone into the primary colloid powder material, mixing for 50min, and uniformly mixing to obtain a colloid powder mixture; and finally, drying the colloid powder mixture for 10 hours at the temperature of 50-55 ℃, and crushing to obtain the colloid powder.
2. Preparation of high copper content powder
Preparing raw materials of colloid powder 47, copper powder 51 and molybdenum disulfide 2 according to the weight part ratio, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 40min at normal temperature, and uniformly mixing to obtain the high-copper-content material powder.
3. Preparation of a Low copper content powder
Preparing raw materials of 75 parts of colloid powder, 20 parts of copper powder and 5 parts of molybdenum disulfide according to the weight parts, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 40min at normal temperature, and uniformly mixing to obtain the low-copper-content material powder.
4. Pressing treatment
Firstly, putting the high-copper-content material powder into the mold; then putting the low-copper-content material powder on the high-copper-content material powder in the mold; then, inserting the copper soft stranded wire into the high copper content material powder through the low copper content material powder in the die; wherein, the high copper content material powder layer is 60% of the total mixture thickness; the low copper content material powder layer is 40% of the total mixture thickness; the wire inserting depth of the copper soft stranded wire is 1/2 of the total material layer thickness in the die. Pressing the mixture in the die by adopting pressing equipment to prepare a carbon brush pressed blank, wherein the unit pressure of the pressing treatment is 4 tons/cm2。
5. Sintering and finished product processing
Placing the pressed carbon brush pressed compact into a high-temperature sintering furnace, and sintering under the protection of nitrogen and hydrogen; wherein, the proportion of the nitrogen and the hydrogen is 70 percent to 25 percent; the sintering process conditions are as follows: raising the temperature in the high-temperature sintering furnace to 500 ℃ within 8.5h, and cooling to room temperature to obtain a carbon brush primary product; and processing the carbon brush primary product to obtain a finished carbon brush product.
And (3) detecting the physical property indexes of the carbon brush finished product, wherein the detection result is shown in table 1.
The carbon brush finished product is subjected to a working test according to the following test conditions and test methods, the service life and the wear rate of the carbon brush finished product are detected, and the test results are shown in table 2.
Working voltage: 12V; the operation mode is as follows: work for 1.5s, rest for 28.5 s; the test conditions are as follows: air cooling is carried out, and the surface temperature of the motor is not more than 50 ℃.
Comparative example 1
1. Preparation of colloidal powder
Preparing raw materials of 80 parts of graphite powder, 20 parts of phenolic resin powder and 30 parts of acetone according to the weight parts, and then mixing the graphite and the phenolic resin for 40min at normal temperature to obtain a colloidal powder primary material; then adding acetone into the primary colloid powder material, mixing for 30min, and uniformly mixing to obtain a colloid powder mixture; and finally, drying the colloid powder mixture at the temperature of 50-55 ℃ for 12h, and crushing to obtain the colloid powder.
2. Preparation of high copper content powder
Preparing raw materials including 45 parts of colloid powder, 52 parts of copper powder and 3 parts of molybdenum disulfide according to the weight parts, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 60min at normal temperature, and uniformly mixing to obtain the high-copper-content material powder.
3. Preparation of a Low copper content powder
Preparing raw materials of 72 parts of colloid powder, 25 parts of copper powder and 3 parts of molybdenum disulfide according to the weight parts, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 60min at normal temperature, and uniformly mixing to obtain the low-copper-content material powder.
4. Pressing treatment
Firstly, putting the high-copper-content material powder into the mold; then putting the low-copper-content material powder on the high-copper-content material powder in the mold; then, inserting the copper soft stranded wire into the high copper content material powder through the low copper content material powder in the die; wherein, the high copper content material powder layer is 65% of the total mixture thickness; the low copper content material powder layer is 35% of the total mixture thickness; the wire inserting depth of the copper soft stranded wire is 3/5 of the total material layer thickness in the die. Pressing the mixture in the die by adopting pressing equipment to prepare a carbon brush pressed blank, wherein the carbon brush pressed blankThe unit pressure of the pressing treatment was 3.5 tons/cm2。
5. Sintering and finished product processing
Placing the pressed carbon brush pressed compact into a high-temperature sintering furnace, and sintering under the protection of nitrogen and hydrogen; wherein, the proportion of the nitrogen and the hydrogen is 70 percent to 25 percent; the sintering process conditions are as follows: heating the high-temperature sintering furnace to 700 ℃ within 12h, and cooling to room temperature to obtain a carbon brush primary product; and processing the carbon brush primary product to obtain a finished carbon brush product.
And (3) detecting the physical property indexes of the carbon brush finished product, wherein the detection result is shown in table 1.
The carbon brush finished product is subjected to a working test according to the following test conditions and test methods, the service life and the wear rate of the carbon brush finished product are detected, and the test results are shown in table 2.
Working voltage: 12V; the operation mode is as follows: work for 1.5s, rest for 28.5 s; the test conditions are as follows: air cooling is carried out, and the surface temperature of the motor is not more than 50 ℃.
Comparative example 2
1. Preparation of colloidal powder
Preparing raw materials comprising 79 parts by weight of graphite powder, 18 parts by weight of phenolic resin powder, 3 parts by weight of tungsten disulfide and 30 parts by weight of acetone, and then mixing the graphite, the phenolic resin and the tungsten disulfide for 35min at normal temperature to obtain a colloid powder primary material; then adding acetone into the primary colloid powder material, mixing for 35min, and uniformly mixing to obtain a colloid powder mixture; and finally, drying the colloid powder mixture at the temperature of 50-55 ℃ for 12h, and crushing to obtain the colloid powder.
2. Preparation of high copper content powder
Preparing raw materials including 45 parts of colloid powder, 52 parts of copper powder and 3 parts of molybdenum disulfide according to the weight parts, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 60min at normal temperature, and uniformly mixing to obtain the high-copper-content material powder.
3. Preparation of a Low copper content powder
Preparing raw materials of 72 parts of colloid powder, 25 parts of copper powder and 3 parts of molybdenum disulfide according to the weight parts, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 60min at normal temperature, and uniformly mixing to obtain the low-copper-content material powder.
4. Pressing treatment
Firstly, putting the high-copper-content material powder into the mold; then putting the low-copper-content material powder on the high-copper-content material powder in the mold; then, inserting the copper soft stranded wire into the high copper content material powder through the low copper content material powder in the die; wherein, the high copper content material powder layer is 65% of the total mixture thickness; the low copper content material powder layer is 35% of the total mixture thickness; the wire inserting depth of the copper soft stranded wire is 3/5 of the total material layer thickness in the die. Pressing the mixture in the die by adopting pressing equipment to prepare a carbon brush pressed blank, wherein the unit pressure of the pressing treatment is 3.5 tons/cm2。
5. Sintering and finished product processing
Placing the pressed carbon brush pressed compact into a high-temperature sintering furnace, and sintering under the protection of nitrogen and hydrogen; wherein, the proportion of the nitrogen and the hydrogen is 70 percent to 25 percent; the sintering process conditions are as follows: heating the high-temperature sintering furnace to 700 ℃ within 15h, and cooling to room temperature to obtain a carbon brush primary product; and processing the carbon brush primary product to obtain a finished carbon brush product.
And (3) detecting the physical property indexes of the carbon brush finished product, wherein the detection result is shown in table 1.
The carbon brush finished product is subjected to a working test according to the following test conditions and test methods, the service life and the wear rate of the carbon brush finished product are detected, and the test results are shown in table 2.
Working voltage: 12V; the operation mode is as follows: work for 1.5s, rest for 28.5 s; the test conditions are as follows: air cooling is carried out, and the surface temperature of the motor is not more than 50 ℃.
Comparative example 3
1. Preparation of colloidal powder
Preparing raw materials of 79 parts of graphite powder, 18 parts of phenolic resin powder, 3 parts of petroleum coke and 30 parts of acetone, and then mixing the graphite, the phenolic resin and the petroleum coke for 30min at normal temperature to obtain a colloid powder primary material; then adding acetone into the primary colloid powder material, mixing for 35min, and uniformly mixing to obtain a colloid powder mixture; and finally, drying the colloid powder mixture at the temperature of 50-55 ℃ for 12h, and crushing to obtain the colloid powder.
2. Preparation of high copper content powder
Preparing raw materials including 45 parts of colloid powder, 52 parts of copper powder and 3 parts of molybdenum disulfide according to the weight parts, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 60min at normal temperature, and uniformly mixing to obtain the high-copper-content material powder.
3. Preparation of a Low copper content powder
Preparing raw materials of 72 parts of colloid powder, 25 parts of copper powder and 3 parts of molybdenum disulfide according to the weight parts, then mixing the colloid powder, the copper powder and the molybdenum disulfide for 60min at normal temperature, and uniformly mixing to obtain the low-copper-content material powder.
4. Pressing treatment
Firstly, putting the high-copper-content material powder into the mold; then putting the low-copper-content material powder on the high-copper-content material powder in the mold; then, inserting the copper soft stranded wire into the high copper content material powder through the low copper content material powder in the die; wherein, the high copper content material powder layer is 65% of the total mixture thickness; the low copper content material powder layer is 35% of the total mixture thickness; the wire inserting depth of the copper soft stranded wire is 3/5 of the total material layer thickness in the die. Pressing the mixture in the die by adopting pressing equipment to prepare a carbon brush pressed blank, wherein the unit pressure of the pressing treatment is 3.5 tons/cm2。
5. Sintering and finished product processing
Placing the pressed carbon brush pressed compact into a high-temperature sintering furnace, and sintering under the protection of nitrogen and hydrogen; wherein, the proportion of the nitrogen and the hydrogen is 70 percent to 25 percent; the sintering process conditions are as follows: heating the high-temperature sintering furnace to 700 ℃ within 15h, and cooling to room temperature to obtain a carbon brush primary product; and processing the carbon brush primary product to obtain a finished carbon brush product.
And (3) detecting the physical property indexes of the carbon brush finished product, wherein the detection result is shown in table 1.
The carbon brush finished product is subjected to a working test according to the following test conditions and test methods, the service life and the wear rate of the carbon brush finished product are detected, and the test results are shown in table 2.
Working voltage: 12V; the operation mode is as follows: work for 1.5s, rest for 28.5 s; the test conditions are as follows: air cooling is carried out, and the surface temperature of the motor is not more than 50 ℃.
Table 1 carbon brush finished product physical property test table
Table 2 carbon brush finished product working test table
As can be seen from the data in Table 1, the carbon brush for the start-stop motor of the passenger car prepared by the method has excellent performance and the volume density of the carbon brush is 3.15-3.30g/cm3The resistivity is 0.40-0.60 mu omega m, and the Rockwell hardness (HR10/392) is 85-110.
As can be seen from the data in table 2, in comparative example 1, no petroleum coke and tungsten disulfide are added in the stage of preparing the colloidal powder, the service life of the prepared carbon brush is shortest, which is only 14 ten thousand times, and the power is reduced by 15% after 10 ten thousand times; in the comparative example 2, no petroleum coke is added in the stage of preparing the colloidal powder, so that the service life of the prepared carbon brush is short, the number of times is 18 ten thousand, and the power is reduced by 12% after 10 ten thousand times; in the comparative example 3, tungsten disulfide is not added in the stage of preparing the colloidal powder, the service life of the prepared carbon brush is short, 23 ten thousand times, and the power is reduced by 11% after 10 ten thousand times; secondly, petroleum coke and tungsten disulfide are added in the stage of preparing the colloid powder, the service life of the prepared carbon brush is long and reaches 25-28 ten thousand times, the carbon brush is small in grinding, and the power is reduced by no more than 10%.
Claims (6)
1. A preparation method of a carbon brush for a passenger vehicle start-stop motor is characterized by comprising the following steps:
uniformly mixing graphite, phenolic resin, tungsten disulfide, petroleum coke and acetone to prepare colloid powder;
uniformly mixing the colloid powder, the copper powder and the molybdenum disulfide to prepare high-copper-content material powder;
uniformly mixing the colloid powder, the copper powder and the molybdenum disulfide to prepare low-copper-content material powder;
respectively adding the high-copper-content material powder and the low-copper-content material powder into a pressing mold, and pressing the materials to obtain a carbon brush pressed blank;
sintering the carbon brush pressed compact to obtain a carbon brush primary product;
grinding the primary electric brush product to obtain a finished carbon brush product;
wherein, add the high copper content powder and low copper content powder into the embossing mold utensil respectively and include:
firstly, putting the high-copper-content material powder into the mold;
then putting the low-copper-content material powder on the high-copper-content material powder in the mold;
and then inserting the copper soft stranded wire into the high copper content material powder through the low copper content material powder in the die.
2. The preparation method according to claim 1, wherein the step of uniformly mixing graphite, phenolic resin, tungsten disulfide, petroleum coke and acetone to prepare the colloidal powder comprises the following steps:
uniformly mixing graphite, phenolic resin, tungsten disulfide and petroleum coke to prepare a colloidal powder primary material;
adding acetone into the primary colloid powder material, and uniformly mixing to obtain a colloid powder mixture;
and drying, crushing and sieving the colloid powder mixture to obtain the colloid powder.
3. The preparation method of claim 2, wherein the weight ratio of the graphite to the phenolic resin to the tungsten disulfide to the petroleum coke to the acetone is 74-78:15-20:2-5:1-5: 25-35.
4. The preparation method of claim 1, wherein the weight ratio of the colloid powder, the copper powder and the molybdenum disulfide in the high copper content material powder is 42-47:51-53: 2-5.
5. The preparation method of claim 1, wherein the weight ratio of the colloid powder, the copper powder and the molybdenum disulfide in the low-copper-content material powder is 71-75:20-28: 1-5.
6. The preparation method according to claim 1, wherein the high copper content powder layer is 60-70% of the total mixture thickness; the low copper content material powder layer is 30-40% of the total mixture thickness; the wire inserting depth of the copper soft stranded wire is 1/2-2/3 of the total material layer thickness in the die.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113224613A (en) * | 2021-04-25 | 2021-08-06 | 苏州东南佳新材料股份有限公司 | Preparation method of carbon brush for electric seat motor |
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| CN102130407A (en) * | 2010-12-24 | 2011-07-20 | 苏州东南碳制品有限公司 | Carbon brush for truck starting motor as well as manufacture method and application thereof |
| CN102856758A (en) * | 2012-09-21 | 2013-01-02 | 丽水市长新电器制造有限公司 | Electric brush for ABS system and preparation method thereof |
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| CN101134675A (en) * | 2007-08-07 | 2008-03-05 | 哈尔滨工程大学 | Preparation method of graphite radical composite material |
| CN102130407A (en) * | 2010-12-24 | 2011-07-20 | 苏州东南碳制品有限公司 | Carbon brush for truck starting motor as well as manufacture method and application thereof |
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| CN113224613A (en) * | 2021-04-25 | 2021-08-06 | 苏州东南佳新材料股份有限公司 | Preparation method of carbon brush for electric seat motor |
| CN113224613B (en) * | 2021-04-25 | 2022-07-01 | 苏州东南佳新材料股份有限公司 | Preparation method of carbon brush for electric seat motor |
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