CN109372911B - Low-wear disc type friction plate and preparation method thereof - Google Patents
Low-wear disc type friction plate and preparation method thereof Download PDFInfo
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- CN109372911B CN109372911B CN201811560978.8A CN201811560978A CN109372911B CN 109372911 B CN109372911 B CN 109372911B CN 201811560978 A CN201811560978 A CN 201811560978A CN 109372911 B CN109372911 B CN 109372911B
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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
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
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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
- F16D65/00—Parts or details
- F16D65/0006—Noise or vibration control
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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
- F16D65/00—Parts or details
- F16D65/0006—Noise or vibration control
- F16D65/0018—Dynamic vibration dampers, e.g. mass-spring systems
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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—Compositions of linings; Methods of manufacturing
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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—Compositions of linings; Methods of manufacturing
- F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
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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
- F16D2069/005—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces having a layered structure
- F16D2069/007—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces having a layered structure comprising a resilient layer
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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
- F16D2069/005—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces having a layered structure
- F16D2069/008—Layers of fibrous materials
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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
- F16D2200/0039—Ceramics
- F16D2200/0047—Ceramic composite, e.g. C/C composite infiltrated with Si or B, or ceramic matrix infiltrated with metal
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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
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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
Abstract
The invention provides a low-abrasion disc type friction plate, which can improve the adhesion between a buffer layer and a steel back combination surface by adding the buffer layer containing a magnetic material between a steel back and a ceramic layer, and effectively prevent brake failure accidents caused by the fact that the buffer layer of the friction material falls off from the steel back when braking is carried out at high temperature (400-500 ℃). And the bonding strength between the friction plate and the steel backing is increased. And avoids the occurrence of iron hard points on the friction surface, eliminates sharp harshness and brake chatter generated in the braking process, and improves the service life of the brake disc due to the brake disc scratch and grooves generated by the iron hard points.
Description
Technical Field
The invention relates to the technical field of friction braking, in particular to a low-wear disc type friction plate and a preparation method of the disc type friction plate.
Background
The disc type friction plate is an assembly consisting of a steel backing and a friction material layer, and is widely applied to the fields of mechanical engineering and automobile manufacturing. Its advantages and disadvantages not only affect the running performance of vehicle, but also relate to the life safety and driving comfort of driver and passengers.
With the vigorous development of the new energy automobile industry, the requirements of the passenger car market on the braking comfort and the environmental friendliness are higher and higher. The phenomena of eliminating brake noise, tremble and the like are more and more strongly concerned by customers and markets, and the disc type friction plate is transited from the traditional metal semimetal base type to the ceramic base.
Although no metal material (such as steel fiber) is added at the beginning of the design of the ceramic-based friction plate, a small amount of metal particles are mixed in the mineral fibers and the filler in the ceramic-based friction plate in the actual production, which is unavoidable. Therefore, during the braking process, metal particles, such as iron impurities, are distributed on the working surface of the friction plate and contact with the brake disc, so that sharp and harsh squealing is generated, and the brake disc is scratched, brake vibration and other faults are generated. The intervention of iron particles can cause the unstable braking coefficient of a local friction surface, and the accidents of braking deviation, even side turning, rear-end collision and the like are generated. It is therefore desirable to avoid direct contact of the ceramic based friction plate with the steel backing.
In view of this, the invention is particularly proposed.
Disclosure of Invention
A first object of the present invention is to provide a low wear disc friction plate.
The second purpose of the invention is to provide a preparation method of the disc type friction plate.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention relates to a low-abrasion disc type friction plate, which comprises a steel back, a buffer layer and a ceramic layer which are sequentially attached, wherein,
the buffer layer is prepared from the following raw materials in parts by weight: 10-20 parts of glass fiber, 1-10 parts of vermiculite, 7-15 parts of phenolic resin, 15-25 parts of light calcium carbonate, 2-8 parts of fibrilia, 1-10 parts of calcium hydroxide, 1-10 parts of neodymium iron boron powdery alloy, 1-10 parts of petroleum coke powder, 7-15 parts of mineral fiber, 6-13 parts of EPDM rubber powder and 1-10 parts of barium sulfate;
the ceramic layer is prepared from the following raw materials in parts by weight: 7-15 parts of carbon fiber, 6-13 parts of ceramic fiber, 10-20 parts of light calcium carbonate, 10-20 parts of phenolic resin, 1-7 parts of calcium hydroxide, 7-15 parts of diatomite, 10-20 parts of barium sulfate, 4-10 parts of graphite, 1-10 parts of petroleum coke powder, 1-7 parts of mica, 1-7 parts of alumina and 1-7 parts of aramid fiber.
Preferably, the buffer layer is prepared from the following raw materials in parts by weight: 15 parts of glass fiber, 5 parts of vermiculite, 13 parts of phenolic resin, 20 parts of light calcium carbonate, 5 parts of fibrilia, 5 parts of calcium hydroxide, 6 parts of neodymium iron boron powdery alloy, 5 parts of petroleum coke powder, 10 parts of mineral fiber, 8 parts of EPDM rubber powder and 6 parts of barium sulfate.
Preferably, the ceramic layer is prepared from the following raw materials in parts by weight: 10 parts of carbon fiber, 1018 parts of ceramic fiber, 14 parts of light calcium carbonate, 16 parts of phenolic resin, 4 parts of calcium hydroxide, 10 parts of diatomite, 15 parts of barium sulfate, 6 parts of graphite, 6 parts of petroleum coke powder, 4 parts of mica, 3 parts of alumina and 4 parts of aramid fiber.
Preferably, the particle size of the powder filler in the raw materials of the buffer layer and the ceramic layer is less than or equal to 150 meshes.
Preferably, the thickness ratio of the buffer layer to the ceramic layer is 1 (2-5), preferably 1: 3.
Preferably, the sum of the thicknesses of the buffer layer and the ceramic layer is 15-25 mm.
The invention also provides a preparation method of the disc type friction plate, which comprises the following steps:
(1) buffer layer mixing: putting the raw materials of the buffer layer into a mixer, and obtaining a buffer layer mixture after the materials are mixed;
(2) ceramic layer mixing: putting the raw materials of the ceramic layer into a mixer, and obtaining a ceramic layer mixture after mixing;
(3) hot-press molding: and sequentially putting the steel backing, the buffer layer mixture and the ceramic layer mixture into the die, and carrying out hot pressing by adopting a pressing process of a constant-density equal-ratio press to obtain the disc friction plate.
Preferably, before the step (1), the steel back is subjected to sand blasting and polishing, then high-temperature-resistant glue is sprayed on the contact surface of the steel back and the buffer layer, and silencing damping paint is sprayed on other surfaces of the steel back.
Preferably, after the mixing in the step (2) is completed, the ferro-manganese alloy block is put into the ceramic layer mixing material and then taken out, if the powdered alloy adsorbed on the surface is uniformly distributed, the mixing is qualified, and if the powdered alloy adsorbed on the surface is agglomerated and accumulated, the mixing is unqualified.
Preferably, in the step (3), the pressure control error is less than or equal to 0.3MPa, the temperature control error is less than or equal to 5 ℃, and the pressing time is controlled by PLC program control.
Preferably, after the mixing in the step (3) is completed, if the height of the mixed material is 100cm, sampling at 5cm, 35cm and 75cm of the bottom of the skip car respectively for bulk density detection, and if the difference of the bulk densities of the three positions is more than 5%, the mixed material is unqualified.
The invention has the beneficial effects that:
the invention provides a low-wear disc type friction plate, which has the following advantages that a buffer layer containing a magnetic material is added between a steel backing and a ceramic layer:
(1) due to the fact that the magnetic material is added into the buffer layer, the adhesion between the buffer layer and the steel backing combination surface can be improved, and the brake failure accident caused by the fact that the friction material buffer layer falls off from the steel backing when the brake is at high temperature (400-500 ℃) can be effectively prevented. And the bonding strength between the friction plate and the steel backing is increased.
(2) The buffer layer can be used as a noise reduction damping layer of the friction plate, and the natural frequency of the whole friction plate and the steel backing can be changed. Especially after adding magnetic material, in friction disc hot briquetting in-process, the magnetic material in the buffer layer compounding can adsorb iron impurity and other iron system alloys in the ceramic layer compounding, makes above-mentioned iron impurity gather in the buffer layer and the junction of ceramic layer under the effect of external pressure to:
a. the shear strength between the buffer layer and the ceramic layer is increased;
b. the occurrence of iron hard points on the friction surface is avoided, and sharp harshness and brake vibration generated in the braking process are eliminated;
c. the brake disc scratch and the groove caused by the iron hard point are avoided, and the service life of the brake disc is prolonged;
d. the groove or excessive abrasion of the working surface of the friction plate caused by the iron hard points is avoided, and the service life of the friction plate is prolonged;
e. the iron hard points of the working surface, namely the contact surface of the brake disc and the friction plate ceramic layer during braking are eliminated, and a more stable friction coefficient is provided for each braking.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a low-wear disc type friction plate of the present invention.
FIG. 2 is a graph showing the relationship between the coefficient of friction and the change in temperature between example 1 and comparative example.
In the figure: 1-steel backing; 2-a buffer layer; 3-ceramic layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
As shown in fig. 1, the embodiment of the present invention relates to a low-wear disc-type friction plate, which includes a steel backing 1, a buffer layer 2, and a ceramic layer 3, which are sequentially attached.
Wherein, the steel backing mainly functions to fix the friction materials such as the ceramic layer and the like. In the preparation process, the powdery friction material has chemical and physical effects at high temperature and high pressure, and is pressed on the steel backing to form the friction plate with an integrated structure, so that the friction plate has the effects of reducing noise, insulating heat and buffering. The ceramic layer can be formed separately and then bonded with the steel backing. However, this method results in insufficient bonding force between the two components, and frequent occurrence of failures such as brake judder and brake noise.
The buffer layer is prepared from the following raw materials in parts by weight: 10-20 parts of glass fiber, 1-10 parts of vermiculite, 7-15 parts of phenolic resin, 15-25 parts of light calcium carbonate, 2-8 parts of fibrilia, 1-10 parts of calcium hydroxide, 1-10 parts of neodymium iron boron powdery alloy, 1-10 parts of petroleum coke powder, 7-15 parts of mineral fiber, 6-13 parts of EPDM rubber powder and 1-10 parts of barium sulfate.
The ceramic layer is prepared from the following raw materials in parts by weight: 7-15 parts of carbon fiber, 6-13 parts of ceramic fiber, 10-20 parts of light calcium carbonate, 10-20 parts of phenolic resin, 1-7 parts of calcium hydroxide, 7-15 parts of diatomite, 10-20 parts of barium sulfate, 4-10 parts of graphite, 1-10 parts of petroleum coke powder, 1-7 parts of mica, 1-7 parts of alumina and 1-7 parts of aramid fiber.
In the above raw materials for preparing the buffer layer and the ceramic layer, the phenolic resin is a high temperature resistant phenolic resin, such as B4The C modified phenolic resin can resist the high temperature of more than 1000 ℃.
The precipitated calcium carbonate is also called precipitated calcium carbonate, and the sedimentation volume (2.4-2.8mL/g) is compared with that of a mechanical methodThe heavy calcium carbonate produced by the method has large sedimentation volume (1.1-1.9mL/g) and is called light calcium carbonate. The light calcium carbonate is non-toxic, odorless and nonirritating, is generally white, and has a relative density of 2.7-2.9; the sedimentation volume is more than 2.5ml/g, the specific surface area is 5m2And about/g.
The Nd-Fe-B alloy is also called neodymium magnet and is made of Nd, Fe and B2Fe14B) The tetragonal system crystal is formed. It has excellent magnetic properties and is the most commonly used rare earth magnet.
The petroleum coke is a product obtained by separating light oil from heavy oil through distillation and then thermally cracking and converting the heavy oil. In appearance, the petroleum coke is in the form of irregular black blocks or particles with different sizes, has metallic luster, and has a porous structure.
The mineral fiber is prepared from ore. For example
Mineral fiber is prepared with basalt and other mineral material and through pre-treatment, high temperature smelting at 1500 deg.c, refining, drawing and special surface treatment.
The quality of mineral fibres is required by the ISO 9001:2000 quality certification system throughout the production and service of the whole product. The softening point of the mineral fiber is about 1200 ℃, the surface of the fiber is smooth and complete, and the use safety is high without causing human body injury.
EPDM rubber is an ethylene-propylene-diene rubber, a copolymer of ethylene, propylene, and a small amount of a non-conjugated diene. Because the main chain of the composite material consists of chemically stable saturated hydrocarbon and only contains unsaturated double bonds in the side chains, the composite material has excellent ozone resistance, heat resistance, weather resistance and other aging resistance, and can be widely applied to the fields of automobile parts, waterproof materials for buildings, wire and cable sheaths, heat-resistant rubber tubes, adhesive tapes, automobile sealing parts and the like.
In a specific embodiment of the invention, the buffer layer is prepared from the following raw materials in parts by weight: 15 parts of glass fiber, 5 parts of vermiculite, 13 parts of phenolic resin, 20 parts of light calcium carbonate, 5 parts of fibrilia, 5 parts of calcium hydroxide, 6 parts of neodymium iron boron powdery alloy, 5 parts of petroleum coke powder, 10 parts of mineral fiber, 8 parts of EPDM rubber powder and 6 parts of barium sulfate.
In one embodiment of the invention, the ceramic layer is prepared from the following raw materials in parts by weight: 10 parts of carbon fiber, 1018 parts of ceramic fiber, 14 parts of light calcium carbonate, 16 parts of phenolic resin, 4 parts of calcium hydroxide, 10 parts of diatomite, 15 parts of barium sulfate, 6 parts of graphite, 6 parts of petroleum coke powder, 4 parts of mica, 3 parts of alumina and 4 parts of aramid fiber.
In one embodiment of the invention, in order to ensure the plane effect obtained after hot press molding, the particle size of the powder filler in the raw materials of the buffer layer and the ceramic layer is less than or equal to 150 meshes.
Because the thickness of disk friction disc is certain, under the unchangeable prerequisite of steel backing thickness, the buffer layer bodiness can reduce the thickness of ceramic layer. The friction force between the working surface of the friction plate and the brake disc is reduced in the braking process, and accidents are easily caused. Therefore, the thickness of the buffer layer cannot be too large, and the buffer layer with too small thickness has low content of magnetic materials, so that the buffer layer cannot fully adsorb iron impurities in the ceramic layer. In one embodiment of the invention, the sum of the thicknesses of the buffer layer and the ceramic layer is 15-25 mm. The thickness ratio of the buffer layer to the ceramic layer is 1 (2-5), preferably 1: 3.
The embodiment of the invention also provides a preparation method of the disc type friction plate, which comprises the following steps:
(1) surface treatment of the steel backing: and (3) carrying out sand blasting and polishing on the steel back, then spraying high-temperature-resistant glue on the contact surface of the steel back and the buffer layer, and spraying noise-reduction damping paint on other surfaces of the steel back.
Wherein the high-temperature-resistant glue can be phenolic resin liquid glue, the viscosity of the high-temperature-resistant glue is 1500-1700 (CP at 25 ℃), the content of free phenol is less than or equal to 1.0%, and the gelling time is 5-6 min.
The noise-reduction damping paint comprises the following raw materials in parts by weight: 45% of the phenolic resin liquid adhesive, 35% of the diluent, 10% of mica and 10% of wood powder, and the phenolic resin liquid adhesive is obtained by uniformly stirring the raw materials. The viscosity is 150-200 (CP at 25 ℃).
(2) Buffer layer mixing: and (3) feeding materials by adopting PLC program control, adding the raw materials of the buffer layer into a plow-rake type mixer according to the sequence of the fiber materials, the organic resin materials and the powder materials for dry mixing, wherein the mixing time is 8-10 min, and thus obtaining a buffer layer mixture.
And after the mixing is finished, putting the ferro-manganese alloy blocks into the ceramic layer mixture and then taking out the ferro-manganese alloy blocks, wherein the mixing is qualified if the powdery alloy adsorbed on the surface is uniformly distributed, and the mixing is unqualified if the powdery alloy adsorbed on the surface is agglomerated and stacked.
(3) Ceramic layer mixing: and (3) feeding by adopting PLC program control, adding the raw materials of the ceramic layer into a plow-rake type mixer according to the sequence of fiber materials, organic resin materials and powder materials for dry mixing, and obtaining a ceramic layer mixture after the mixing is finished.
After the material mixing is finished, if the height of the mixed material is 100cm, sampling at the positions 5cm, 35cm and 75cm at the bottom of the skip car respectively for bulk density detection, and if the difference of the bulk densities of the three positions is more than 5%, the material mixing is unqualified.
(4) Hot-press molding: and sequentially putting the steel backing, the buffer layer mixture and the ceramic layer mixture into the die, and adopting a constant-density equal-ratio press to perform pressing. One cylinder and one die, and the production press adopts a single-cylinder 25-ton equal-ratio press. In the process, the pressure control error is less than or equal to 0.3MPa, the temperature control error is less than or equal to 5 ℃, and the pressing time is controlled by PLC program control to obtain the disc type friction plate.
Example 1
A disc friction plate comprises a steel back, a buffer layer and a ceramic layer which are sequentially attached.
The buffer layer is prepared from the following raw materials in parts by weight: 15 parts of glass fiber, 5 parts of vermiculite, 13 parts of phenolic resin, 20 parts of light calcium carbonate, 5 parts of fibrilia, 5 parts of calcium hydroxide, 6 parts of neodymium iron boron powdery alloy, 5 parts of petroleum coke powder, 10 parts of mineral fiber, 8 parts of EPDM rubber powder and 6 parts of barium sulfate.
The ceramic layer is prepared from the following raw materials in parts by weight: 10 parts of carbon fiber, 1018 parts of ceramic fiber, 14 parts of light calcium carbonate, 16 parts of phenolic resin, 4 parts of calcium hydroxide, 10 parts of diatomite, 15 parts of barium sulfate, 6 parts of graphite, 6 parts of petroleum coke powder, 4 parts of mica, 3 parts of alumina and 4 parts of aramid fiber.
The granularity of the powder filler in the raw materials of the buffer layer and the ceramic layer is less than or equal to 150 meshes. The thickness ratio of the buffer layer to the ceramic layer is 1:3, and the sum of the thicknesses of the buffer layer and the ceramic layer is 20 mm.
The disc type friction plate is prepared by the following method:
(1) surface treatment of the steel backing: and (3) carrying out sand blasting and polishing on the steel back, then spraying phenolic resin liquid glue on the contact surface of the steel back and the buffer layer, and spraying noise reduction damping paint on other surfaces of the steel back.
(2) Buffer layer mixing: and (3) feeding materials by adopting PLC program control, adding the raw materials of the buffer layer into a plow-rake type mixer according to the sequence of the fiber materials, the organic resin materials and the powder materials for dry mixing, wherein the mixing time is 8-10 min, and thus obtaining a buffer layer mixture.
(3) Ceramic layer mixing: and (3) feeding by adopting PLC program control, adding the raw materials of the ceramic layer into a plow-rake type mixer according to the sequence of fiber materials, organic resin materials and powder materials for dry mixing, and obtaining a ceramic layer mixture after the mixing is finished.
(4) Hot-press molding: and sequentially putting the steel backing, the buffer layer mixture and the ceramic layer mixture into the die, and adopting a constant-density equal-ratio press to perform pressing. One cylinder and one die, and the production press adopts a single-cylinder 25-ton equal-ratio press. In the process, the pressure control error is less than or equal to 0.3MPa, the temperature control error is less than or equal to 5 ℃, and the pressing time is controlled by PLC program control to obtain the disc type friction plate.
Comparative example 1
The buffer layer was not added with powdered alloy of neodymium iron boron, and the other raw materials and preparation process were the same as in example 1.
Test example
The friction plates obtained in example 1 and comparative example 1 were subjected to constant speed testing in accordance with GB 5763-2008. Table 1 shows the friction coefficient and wear rate of the disc friction plates of example 1 and comparative example 1 at different temperatures.
TABLE 1
FIG. 2 is a graph showing the relationship between the coefficient of friction and the change in temperature between example 1 and comparative example 1. Wherein the abscissa is temperature (unit C) and the ordinate is coefficient of friction.
As can be seen from table 1 and fig. 2, after the magnetic material, namely, the powdered alloy of neodymium iron boron, is added to the buffer layer, the friction coefficient is more stable at different temperatures, and the wear rate is smaller. The scheme of the invention can reduce the abrasion caused by iron hard points and reduce the strain on the dual-surface brake disc when the ceramic layer is contacted with the brake disc.
The shear strength between the buffer layer and the ceramic layer and between the buffer layer and the steel backing of the friction sheets obtained in example 1 and comparative example 1 at different temperatures was recorded according to the data measured by the constant velocity tester, and the results are shown in table 2.
TABLE 2
Table 2 shows that the shear strength between the buffer layer and the ceramic layer, and between the buffer layer and the steel backing in example 1 is significantly higher than that in comparative example 1 at different temperatures.
Examples 2 to 5
In examples 2 to 5, the thickness ratio of the buffer layer to the ceramic layer, the amount of the magnetic material added, and other raw materials and the preparation process were the same as those in example 1. The corresponding parameters and wear rates at 100 ℃ are shown in Table 3.
TABLE 3
As can be seen from table 3, when the thickness ratio of the buffer layer to the ceramic layer is not in the range of 1:3, or the addition amount of the magnetic material is changed, the wear rate is increased.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A low-abrasion disc friction plate is characterized by comprising a steel back, a buffer layer and a ceramic layer which are sequentially attached, wherein,
the buffer layer is prepared from the following raw materials in parts by weight: 10-20 parts of glass fiber, 1-10 parts of vermiculite, 7-15 parts of phenolic resin, 15-25 parts of light calcium carbonate, 2-8 parts of fibrilia, 1-10 parts of calcium hydroxide, 1-10 parts of neodymium iron boron powdery alloy, 1-10 parts of petroleum coke powder, 7-15 parts of mineral fiber, 6-13 parts of EPDM rubber powder and 1-10 parts of barium sulfate;
the ceramic layer is prepared from the following raw materials in parts by weight: 7-15 parts of carbon fiber, 6-13 parts of ceramic fiber, 10-20 parts of light calcium carbonate, 10-20 parts of phenolic resin, 1-7 parts of calcium hydroxide, 7-15 parts of diatomite, 10-20 parts of barium sulfate, 4-10 parts of graphite, 1-10 parts of petroleum coke powder, 1-7 parts of mica, 1-7 parts of alumina and 1-7 parts of aramid fiber;
the thickness ratio of the buffer layer to the ceramic layer is 1: 3.
2. The disc friction plate of claim 1, wherein the buffer layer is prepared from the following raw materials in parts by weight: 15 parts of glass fiber, 5 parts of vermiculite, 13 parts of phenolic resin, 20 parts of light calcium carbonate, 5 parts of fibrilia, 5 parts of calcium hydroxide, 6 parts of neodymium iron boron powdery alloy, 5 parts of petroleum coke powder, 10 parts of mineral fiber, 8 parts of EPDM rubber powder and 6 parts of barium sulfate.
3. The disc friction plate of claim 1, wherein the ceramic layer is prepared from the following raw materials in parts by weight: 10 parts of carbon fiber, 1018 parts of ceramic fiber, 14 parts of light calcium carbonate, 16 parts of phenolic resin, 4 parts of calcium hydroxide, 10 parts of diatomite, 15 parts of barium sulfate, 6 parts of graphite, 6 parts of petroleum coke powder, 4 parts of mica, 3 parts of alumina and 4 parts of aramid fiber.
4. The disc friction plate of claim 1, wherein the particle size of the powder filler in the raw materials of the buffer layer and the ceramic layer is less than or equal to 150 meshes.
5. The disc friction plate of claim 1, wherein the sum of the thicknesses of the buffer layer and the ceramic layer is 15-25 mm.
6. A method of manufacturing a disc friction plate according to any one of claims 1 to 5, comprising the steps of:
(1) buffer layer mixing: putting the raw materials of the buffer layer into a mixer, and obtaining a buffer layer mixture after the materials are mixed;
(2) ceramic layer mixing: putting the raw materials of the ceramic layer into a mixer, and obtaining a ceramic layer mixture after mixing;
(3) hot-press molding: and sequentially putting the steel backing, the buffer layer mixture and the ceramic layer mixture into the die, and carrying out hot pressing by adopting a pressing process of a constant-density equal-ratio press to obtain the disc friction plate.
7. The method as claimed in claim 6, wherein before the step (1), the steel backing is sand-blasted and polished, then the high-temperature resistant glue is sprayed on the contact surface of the steel backing and the buffer layer, and the silencing damping paint is sprayed on other surfaces of the steel backing.
8. The method according to claim 6, characterized in that after the mixing in the step (2) is completed, the ferro-manganese alloy blocks are put into the ceramic layer mixture and then taken out, and the mixing is qualified if the powdered alloy adsorbed on the surface is uniformly distributed, and the mixing is unqualified if the powdered alloy adsorbed on the surface is agglomerated and stacked.
9. The method as claimed in claim 6, wherein in the step (3), the pressure control error is less than or equal to 0.3MPa, the temperature control error is less than or equal to 5 ℃, and the pressing time is controlled by PLC program control.
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| DE102020113510A1 (en) * | 2020-05-19 | 2021-11-25 | Tmd Friction Services Gmbh | Damping material for a damping or intermediate layer for brake linings and a method for producing the damping material |
| CN112145599A (en) * | 2020-09-03 | 2020-12-29 | 桐庐宇鑫汽配有限公司 | Processing technology of calcium sulfate whisker brake pad |
| CN112145587A (en) * | 2020-09-03 | 2020-12-29 | 桐庐宇鑫汽配有限公司 | Processing technology of environment-friendly high-performance copper-free brake pad |
| CN112032222B (en) * | 2020-09-04 | 2021-11-30 | 安徽博耐克摩擦材料有限公司 | High-hardness automobile brake pad with high wear resistance and preparation method thereof |
| CN114956659A (en) * | 2022-05-09 | 2022-08-30 | 枣阳风神摩擦材料有限公司 | Novel friction plate and preparation method thereof |
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