CN112576664A - Composite brake pad for railway vehicle with speed per hour less than or equal to 160km/h - Google Patents
Composite brake pad for railway vehicle with speed per hour less than or equal to 160km/h Download PDFInfo
- Publication number
- CN112576664A CN112576664A CN202011592260.4A CN202011592260A CN112576664A CN 112576664 A CN112576664 A CN 112576664A CN 202011592260 A CN202011592260 A CN 202011592260A CN 112576664 A CN112576664 A CN 112576664A
- Authority
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- China
- Prior art keywords
- fiber
- rubber
- nitrile rubber
- brake shoe
- friction body
- Prior art date
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- Pending
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- 239000002131 composite material Substances 0.000 title claims abstract description 14
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 19
- 229920001971 elastomer Polymers 0.000 claims abstract description 17
- 239000005060 rubber Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 8
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 6
- 229920003043 Cellulose fiber Polymers 0.000 claims abstract description 6
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 6
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 239000004917 carbon fiber Substances 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims abstract description 6
- 239000010439 graphite Substances 0.000 claims abstract description 6
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000002557 mineral fiber Substances 0.000 claims abstract description 6
- 229920005989 resin Polymers 0.000 claims abstract description 6
- 239000011347 resin Substances 0.000 claims abstract description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- 239000010431 corundum Substances 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 5
- YPMOSINXXHVZIL-UHFFFAOYSA-N sulfanylideneantimony Chemical compound [Sb]=S YPMOSINXXHVZIL-UHFFFAOYSA-N 0.000 claims description 5
- 238000007669 thermal treatment Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000004073 vulcanization Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- 238000007731 hot pressing Methods 0.000 claims 1
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 abstract description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 241000357293 Leptobrama muelleri Species 0.000 abstract description 3
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 239000002783 friction material Substances 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 abstract description 2
- 229920001568 phenolic resin Polymers 0.000 abstract description 2
- 239000005011 phenolic resin Substances 0.000 abstract description 2
- 238000005979 thermal decomposition reaction Methods 0.000 abstract description 2
- 239000003292 glue Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000011265 semifinished product Substances 0.000 description 4
- 244000226021 Anacardium occidentale Species 0.000 description 3
- 235000020226 cashew nut Nutrition 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000035800 maturation Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/025—Compositions based on an organic binder
- F16D69/026—Compositions based on an organic binder containing fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/027—Compositions based on metals or inorganic oxides
- F16D69/028—Compositions based on metals or inorganic oxides containing fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D2069/002—Combination of different friction materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/04—Attachment of linings
- F16D2069/0425—Attachment methods or devices
- F16D2069/045—Bonding
- F16D2069/0466—Bonding chemical, e.g. using adhesives, vulcanising
- F16D2069/0475—Bonding chemical, e.g. using adhesives, vulcanising comprising thermal treatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0004—Materials; Production methods therefor metallic
- F16D2200/0026—Non-ferro
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0052—Carbon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0056—Elastomers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/006—Materials; Production methods therefor containing fibres or particles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/006—Materials; Production methods therefor containing fibres or particles
- F16D2200/0065—Inorganic, e.g. non-asbestos mineral fibres
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0082—Production methods therefor
- F16D2200/0086—Moulding materials together by application of heat and pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0023—Shaping by pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0038—Surface treatment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0061—Joining
- F16D2250/0069—Adhesive bonding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0092—Tools or machines for producing linings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Braking Arrangements (AREA)
Abstract
The invention relates to a composite brake pad for railway vehicles with the speed per hour less than or equal to 160km/h, which aims to solve the problem that various energy-saving technologies need to be applied to achieve the aim of energy conservation and emission reduction, wherein various composite materials are fused to meet the actual use requirements. Through the design, the railway vehicle has obvious effects of improving safety, reducing noise and improving riding comfort, the technical scheme of the invention is that the friction body comprises a friction body and a steel back, the friction body comprises nitrile rubber, a rubber accelerator, a rubber vulcanizing agent, an anti-aging agent, high-temperature resistant boron modified resin, nitrile rubber powder, barium sulfate, crystalline flake graphite, coke powder, silicon carbide, iron oxide red, aluminum oxide, composite mineral fiber, cellulose fiber, aramid fiber, steel fiber and carbon fiber, and the invention has the advantages that: the problems of overhigh modulus, overlow strength, high noise, low thermal decomposition temperature and unstable decomposition residue performance of a friction layer caused by a friction material taking pure phenolic resin as a matrix in the traditional process are solved.
Description
Technical Field
The invention belongs to a railway brake device, and particularly relates to a synthetic brake pad for railway braking with a speed per hour less than or equal to 160 km/h.
Background
With the development of Chinese economy, the main stream of economic development is to reduce energy consumption, reduce emission and improve safety, and the rapid development of railway technology in China also faces significant innovation in the braking technology of rolling stock. In order to achieve the aim of energy conservation and emission reduction, various energy-saving technologies need to be applied, wherein various composite materials are adopted to be fused to meet the actual use requirements. Through the design, the railway vehicle has remarkable effects of improving safety, reducing noise and improving riding comfort, so that the railway vehicle can be widely applied to the railway vehicle.
Disclosure of Invention
The technical scheme adopted by the invention is as follows: the speed per hour is less than or equal to 160km/h, the brake pad for the railway vehicle comprises a friction body and a steel backing, wherein the friction body comprises nitrile rubber, a rubber accelerator, a rubber vulcanizing agent, an anti-aging agent, high-temperature-resistant boron modified resin, nitrile rubber powder, barium sulfate, flake graphite, coke powder, silicon carbide, reduced iron powder, brown corundum, antimony sulfide, diatomite, iron oxide red, aluminum oxide, composite mineral fiber, cellulose fiber, aramid fiber, steel fiber and carbon fiber; the weight percentage of each component is as follows: 8-10% of nitrile rubber, 0.5-1% of rubber accelerator, 0.5-1% of rubber vulcanizing agent, 0.3-0.5% of anti-aging agent, 8-10% of high-temperature resistant boron modified resin, 3-5% of nitrile rubber powder, 6-8% of barium sulfate, 3-5% of flake graphite, 2-3% of coke powder, 2-3% of silicon carbide, 4-6% of reduced iron powder, 3-5% of brown corundum, 2-3% of antimony sulfide, 3-5% of diatomite, 1-2% of iron oxide red, 3-5% of aluminum oxide, 8-10% of composite mineral fiber, 8-10% of cellulose fiber, 4-6% of aramid fiber, 3-5% of steel fiber and 3-5% of carbon fiber;
the synthetic brake pad for the railway vehicle with the speed per hour less than or equal to 160km/h is prepared by the following steps:
1) the nitrile rubber is open-milled in two sections, the roll temperature of the first section is 40-45 ℃, the roll gap is 2-3 mm, the raw rubber is firstly added, and then the zinc oxide, the anti-aging agent and the carbon black are added, and the mixture is taken out and placed; the second section of roller temperature is 35-40 ℃, the roller spacing is 3-4 mm, first section of glue is added, the cutting knife is uniformly mixed, sulfur is added, and the cutting knife is thin and through after all the glue is mixed;
2) adding the glue obtained in the step 1) and the rest components of the friction body into an internal mixer for pressure mixing, controlling the temperature to be less than or equal to 90 ℃, intensively mixing, standing and cooling to room temperature to obtain a mixture;
3) pressing the mixture prepared in the step 2) on a specific steel back by using a mold, heating to 170 ℃ and 180 ℃ for hot press forming under the pressure of a press machine of 20-24 MPa to obtain a formed semi-finished product;
4) the press-formed semifinished product obtained in 3) was clamped in a self-made special jig, and a pressure of about 10KN/m2 was applied.
5) And (3) heating the treated brake pad in an oven by adopting hot air circulation electric heating for 36H, gradually raising the temperature of the first 20H until the highest heat treatment temperature reaches 250 ℃, keeping the heat treatment temperature at 250 ℃ for the second 16H, fully reacting all the raw materials, and ensuring complete maturity to obtain the synthetic brake pad. The heat treatment adopts a sectional heat treatment mode, the temperature is gradually increased, the surface of the brake pad is ensured to be consistent with the internal temperature thereof, the maturation degree of the composite material is ensured to be consistent, and the effective heat treatment can be ensured by adopting hot air circulation electric heating.
Compared with the prior art, the invention has the beneficial effects that:
1. the organic synthetic brake pad product developed by our company does not contain asbestos, lead and other substances which may harm human health, and belongs to an environment-friendly product;
2. the friction body is mainly made of high polymer materials, and the friction body has the characteristics of light specific gravity, moderate hardness, no thermal damage to the dual braking surfaces, stable and comfortable braking, long service life and the like while meeting the braking requirement;
3. the cashew modified phenolic resin is adopted in the friction body material adhesive, the cashew modified phenolic resin has better adhesion and heat resistance after being fused with other materials, the braking is more comfortable and stable, and the problems of overhigh modulus, overlow strength, high noise, low thermal decomposition temperature and unstable decomposition residue performance of a friction layer caused by a friction material taking pure phenolic resin as a matrix in the traditional process are solved, so the cashew modified phenolic resin is the optimal selection suitable for the process requirement of the synthetic brake pad.
4. The friction body material is formed by blending the nitrile rubber and the rubber powder, and compared with natural rubber and styrene butadiene rubber, the nitrile rubber has the characteristics of high elasticity, good wear resistance, good cold resistance, low heat generation, good bending resistance, flexibility resistance, dynamic performance and the like, and after vulcanization, the friction body material is particularly excellent in cold resistance, wear resistance and elasticity, less in heat generation under dynamic load, aging resistance, and the rubber powder is easy to disperse and blend for use, so that the performance of the friction body material is more stable, and the like. The nitrile rubber has good weather resistance and cold resistance, and can be well adapted to the actual operation conditions of large regional climate difference of China railways.
Detailed Description
The first embodiment is as follows:
the technical scheme adopted by the invention is as follows: the speed per hour is less than or equal to 160km/h, the brake pad for the railway vehicle comprises a friction body and a steel backing, wherein the friction body comprises nitrile rubber, a rubber accelerator, a rubber vulcanizing agent, an anti-aging agent, high-temperature-resistant boron modified resin, nitrile rubber powder, barium sulfate, flake graphite, coke powder, silicon carbide, reduced iron powder, brown corundum, antimony sulfide, diatomite, iron oxide red, aluminum oxide, composite mineral fiber, cellulose fiber, aramid fiber, steel fiber and carbon fiber; the weight percentage of each component is as follows: 10% of nitrile rubber, 0.8% of rubber accelerator, 0.8% of rubber vulcanizing agent, 0.5% of anti-aging agent, 10% of high-temperature resistant boron modified resin, 4% of nitrile rubber powder, 7% of barium sulfate, 4.5% of crystalline flake graphite, 3% of coke powder, 2% of silicon carbide, 6% of reduced iron powder, 5% of brown corundum, 3% of antimony sulfide, 4.5% of diatomite, 2% of iron oxide red, 3% of aluminum oxide, 9% of composite mineral fiber, 10% of cellulose fiber, 6% of aramid fiber, 5% of steel fiber and 4.5% of carbon fiber;
the synthetic brake pad for railway braking with the speed per hour less than or equal to 160km/h is prepared by the following steps:
1) the nitrile rubber is open-milled in two sections, the roll temperature of the first section is 40-45 ℃, the roll gap is 2-3 mm, the raw rubber is firstly added, the rubber accelerator and the anti-aging agent are added, and the nitrile rubber is taken out and placed; the second section of roller temperature is 35-40 ℃, the roller spacing is 3-4 mm, first section of glue is added, the cutting knife is uniformly mixed, sulfur is added, and the cutting knife is thin and through after all the glue is mixed;
2) adding the glue obtained in the step 1) and the rest components of the friction body into an internal mixer for pressure mixing, controlling the temperature to be less than or equal to 90 ℃, intensively mixing, standing and cooling to room temperature to obtain a mixture;
3) pressing the mixture prepared in the step 2) on a specific steel back by using a mold, heating to 170 ℃ and 180 ℃ for hot press forming under the pressure of a press machine of 20-24 MPa to obtain a formed semi-finished product;
4) the press-formed semifinished product obtained in 3) was clamped in a self-made special jig, and a pressure of about 10KN/m2 was applied.
5) And (3) performing thermal treatment on the treated brake pad in an oven by adopting hot air circulation electric heating for 30H, gradually raising the temperature of the first 22H until the highest thermal treatment temperature reaches 250 ℃, keeping the thermal treatment temperature at 250 ℃ for the last 8H, fully reacting all the raw materials, and ensuring complete maturity to obtain the synthetic brake pad. The heat treatment adopts a sectional heat treatment mode, the temperature is gradually increased, the surface of the brake pad is ensured to be consistent with the internal temperature thereof, the maturation degree of the composite material is ensured to be consistent, and the effective heat treatment can be ensured by adopting hot air circulation electric heating.
TABLE 1 temperature and time during Heat treatment
| Temperature (. degree.C.) | Room temperature of 80 ℃ to 80% | 80 | 80~100 | 100 | 100~120 | 120 | 120~140 | 140 |
| Time (min) | 30 | 60 | 10 | 60 | 10 | 120 | 10 | 180 |
| Temperature (. degree.C.) | 140~160 | 160 | 160~180 | 180 | 180~200 | 200 | 200~220 | 220 |
| Time (min) | 15 | 180 | 15 | 180 | 15 | 180 | 15 | 180 |
| Temperature (. degree.C.) | 220~240 | 240 | 240~250 | 250 | ||||
| Time (min) | 15 | 180 | 15 | 480 |
Note: the total temperature rise process is 22H, then the constant temperature of 250 ℃ is kept for 8 hours, and the whole heat treatment process is 30H.
Claims (3)
1. The brake block is designed for intercity railway braking, comprises a friction body and a steel backing, and is characterized in that the brake block can be used in railway vehicles with the speed per hour not more than 160km/h and the axle weight not more than 18t, has good wear resistance, effectively prolongs the service life of parts, and reduces the repair cost in the railway industry, and the friction body comprises nitrile rubber, a rubber accelerator, a rubber vulcanizing agent, an anti-aging agent, high-temperature resistant boron modified resin, nitrile rubber powder, barium sulfate, flake graphite, coke powder, silicon carbide, reduced iron powder, corundum cellulose fiber, antimony sulfide, kieselguhr, iron oxide red, cellulose powder, composite mineral fiber, aramid fiber, steel fiber, carbon fiber and the like.
2. The brake shoe after being pressed is placed in a self-made special fixture, the pressure of about 10KN/m2 is applied, then the brake shoe is sent into an oven for vulcanization, and the pressing heat treatment mode can effectively improve the deformation problem of the brake shoe in the heat treatment process and increase the stability of the product in use.
3. The composite brake shoe for braking of an intercity railway at a speed of not more than 160km/h as claimed in claim 1 or 2, which is prepared by:
1) the nitrile rubber is milled in two sections;
2) intensively mixing all the raw materials in an internal mixer with the temperature controlled to be less than or equal to 90 ℃;
3) the pressure of brake shoe molding is 20-24 MPa, and heating and hot-pressing molding is carried out;
4) clamping the pressed brake shoe in a self-made special clamp, and applying a pressure of about 10KN/m 2;
5) and (4) performing thermal treatment for 30H by using hot air circulation electric heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011592260.4A CN112576664A (en) | 2020-12-29 | 2020-12-29 | Composite brake pad for railway vehicle with speed per hour less than or equal to 160km/h |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011592260.4A CN112576664A (en) | 2020-12-29 | 2020-12-29 | Composite brake pad for railway vehicle with speed per hour less than or equal to 160km/h |
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|---|---|
| CN112576664A true CN112576664A (en) | 2021-03-30 |
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| CN202011592260.4A Pending CN112576664A (en) | 2020-12-29 | 2020-12-29 | Composite brake pad for railway vehicle with speed per hour less than or equal to 160km/h |
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| CN (1) | CN112576664A (en) |
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