Disc friction plate capable of quickly repairing mating surface and preparation method thereof

Abstract

The application discloses a disc type friction plate capable of quickly repairing a pair of friction surfaces and a preparation method thereof, and relates to the technical field of brake friction. The technical points of the application are as follows: the friction plate is prepared from the following components: phenolic resin 10-13% by mass, synthetic graphite 5-8% by mass, graphite coke 5-8% by mass, steel fiber 15-20% by mass, barium sulfate 15-20% by mass, chabazite 5-8% by mass, vermiculite 5-8% by mass, aramid fiber 2-4% by mass, iron oxide black 3-5% by mass, and elastic particles 10-15% by mass. The phenolic resin, barium sulfate and iron oxide black are 200 mesh, the synthetic graphite, graphite coke and vermiculite are 80 mesh, and the chabazite is 100 mesh. When the friction plate is used to repair a brake disc, a part of polytetrafluoroethylene binder is separated out from the friction plate, and the polytetrafluoroethylene, phenolic resin and friction generated abrasive dust are adhered to the pair of friction surfaces, so that the direct friction between the metal-based friction material and the brake disc is blocked, and the generation of friction welding is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of brake friction, in particular to a disc brake friction plate capable of quickly repairing a friction surface and a preparation method thereof. BACKGROUND

[0002] The friction plate has a large wear amount and a high cost, and since the area of the friction plate is small, the relative friction working surface is also small, and a high brake hydraulic pressure is required. The disc brake has the defects that the friction plate directly acts on the disc, has no automatic friction force increasing effect, and has low brake efficiency, so when the disc brake is used in a hydraulic brake system, if the required brake actuating pipeline pressure is high, a power auxiliary device needs to be additionally arranged, and when the disc brake is used for parking brake, the parking brake transmission device to be additionally arranged is more complex than that of a drum brake.

[0003] Since January 1, 2018, the national standard GB7258 has been formally implemented, and the standard requirements are that the disc brake must be installed on the semi-trailer for transporting dangerous goods since January 1, 2019. The obvious failure parts of the pneumatic disc brake after being assembled are that grooves and concave-convex surfaces appear on the surface of the brake disc, the friction plate is rapidly worn, and finally the friction plate iron back plate directly contacts and rubs against the brake disc to generate high brake temperature and fire.

[0004] In view of this, the present application is filed. SUMMARY

[0005] The application aims to solve the above problems, and provides a disc brake friction plate capable of quickly repairing a friction surface and a preparation method thereof. The friction plate is coated and inlaid with an adhesive layer on the surface of the brake disc under the action of multiple and repeated braking forces, the repair of the friction surface is realized, and the grooves and concave-convex surfaces on the surface of the brake disc are reduced.

[0006] In order to achieve the above purpose, the technical scheme of the application is as follows: a disc brake friction plate capable of quickly repairing a friction surface is prepared from the following components in a mass ratio: phenolic resin 10%-13%, synthetic graphite 5%-8%, graphite coke 5%-8%, steel fiber 15%-20%, barium sulfate 15%-20%, chabazite 5%-8%, vermiculite 5%-8%, aramid fiber 2%-4%, iron oxide black 3%-5%, and elastic particles 10%-15%.

[0007] The phenolic resin as the binder can maintain the integrity and stability of its structure under high temperature, the synthetic graphite and the graphite coke as the anti-friction agent and the lubricant can reduce the wear degree of the friction plate and the counter-plate during braking, the chabazite can effectively adsorb the overflow material of the elastic particles under high temperature of braking, the vermiculite can increase the porosity of the friction material matrix, facilitating the generation of the adhesion layer of the counter-plate, the iron oxide black can ensure that the friction coefficient is sufficient under high temperature of braking, the aramid fiber and the steel fiber constitute the structural framework of the friction material.

[0008] In the actual application process, the process and principle of the friction plate repairing the brake disc are as follows: under the high temperature of initial braking, the 200-mesh anti-friction material in the elastic particles overflows under the initial braking, is adsorbed by the chabazite in the friction plate, and continues to be separated out and adhered to the surface of the brake disc under the action of the subsequent braking force, so as to repair the surface grooves of the brake disc. The advantage of the prepared elastic particles is that the rubber is vulcanized in advance, so as to improve the overall high-temperature resistance of the overflow material. The surface grooves of the brake disc are generated under high-temperature harsh working conditions. The prepared high-temperature-resistant elastic particles wrap the overflow material. The actual working conditions involve high temperature, which will damage the elastic matrix overflow repair. The working conditions do not involve high temperature, and it will always remain in a "dormant" state. In this way, the friction plate is more suitable for working conditions.

[0009] Preferably, the phenolic resin, the barium sulfate and the iron oxide black are 200 mesh; and / or the synthetic graphite, the graphite coke and the vermiculite are 80 mesh; and / or the chabazite is 100 mesh. The vermiculite and the chabazite, the 80-mesh vermiculite changes the porosity of the matrix, and affects the overflow efficiency of the overflow material in the later period. The 100-mesh chabazite is the optimal value for adsorbing the organic components (the initial binder of the repair layer) in the elastic particles under high temperature, preventing rapid volatilization. The other materials are required for production and processing. The particle size affects the material dispersion and the uniformity of the product.

[0010] Preferably, the elastic particles are prepared from the following components in mass ratio: polytetrafluoroethylene 5%-8%, butyronitrile rubber 10%-13%, synthetic graphite 8%-10%, titanium white powder 5%-8%, flaky graphite 15%-18%, aluminum oxide 5%-7%, magnesium oxide 6%-8%, carbon fiber 5%-8%, barium sulfate 15%-20%, sulfur 0.5%-1.5%, antioxidant 0.3%-0.5%, and zinc oxide 0.2%-0.5%. If the amount of polytetrafluoroethylene is insufficient or reduced, the generation of the bonding layer of the brake disc will be affected; if the amount of vulcanizing agent (sulfur, zinc oxide, antioxidant) is reduced or absent, the service life of the friction plate will be reduced and the wear of the paired brake disc will be increased; if the amount of carbon fiber is reduced or absent, the service life of the friction material will be greatly reduced; if the amount of aluminum oxide is reduced or absent, the braking torque after the generation of the bonding layer of the brake disc will be greatly reduced; magnesium oxide is a high-temperature curing agent, barium sulfate is a stable matrix filler, and has the effects of stabilization and cost reduction; synthetic graphite and flaky graphite serve as abrasion-reducing agents and lubricants, and can reduce the wear degree of the friction plate and the paired brake disc during braking; and titanium white powder mainly serves to reinforce and prevent cracking of rubber products.

[0011] Preferably, the titanium white powder, flaky graphite, aluminum oxide, magnesium oxide, barium sulfate, and sulfur are 200 mesh; the antioxidant and zinc oxide are 100 mesh; the polytetrafluoroethylene is 10 mesh; and the synthetic graphite is 80 mesh. The 200 mesh aluminum oxide affects the friction coefficient of the later repair layer, and ensures the later braking effect; if the particle size is too large, uneven dispersion will cause uneven braking torque in the later stage; if the particle size is too fine, the effect will not be greatly improved, and the cost will be greatly increased; and the others are conventional parameters of the material.

[0012] Preferably, the elastic particles are prepared by a method comprising the following steps:

[0013] T1, mixing: each raw material is added to the mixing machine in proportion, the upper ram of the mixing machine is lowered, the pressure in the material bin is 2.5-3.0 Mpa, cooling water is supplied to the material bin throughout the process, there are multiple cooling water pipes in the wall of the material bin to prevent burning of the material during vulcanization, cooling water is strictly prohibited from entering the material, the maximum alarm temperature of the mixing machine is 96-100°C, the rotor speed is 35-40 rpm, and the mixing time is 12-15 min; if the pressure in the material bin is too low, the rubber block cannot be fully mixed with other materials in the mixing machine, which will affect the subsequent performance; if the pressure is too high, the rubber polytetrafluoroethylene elasticity will be reduced, which will affect the generation of the bonding layer of the brake disc; if the temperature is too low, the rubber cannot be fully vulcanized, which will affect the strength and service life of the subsequent product; if the temperature is too high, the rubber will be over-vulcanized, which will greatly reduce the strength and service life of the product; if the speed is too low, the material cannot be uniformly mixed; and if the speed is too high, the structure of the vulcanized rubber will be damaged, which will affect the service life. The mixing time is determined according to the set maximum alarm temperature.

[0014] T2, roll milling: after the rubber compound is crushed and cooled, roll milling is started, the roll speed is 20-25 rpm, cooling water is supplied to the double rollers throughout the process, the double roller gap is 2.5-2.8 mm, and the roll milling time is 240-280 s; roll milling is a supplement to the rubber mixing process, which is to prevent the unvulcanized rubber mass from flowing into the next process, the speed, gap size, and time are the three elements of roll milling, and the rubber cannot be sufficiently vulcanized when the speed is lower than 20 rpm, the time is lower than 240 s, and the double roller gap is 2.8 mm, and the rubber will be over-vulcanized, the product strength and service life will be greatly reduced when the speed is too fast, the gap is too small, and the time is too long.

[0015] T3, crushing: the elastic material after roll milling is placed in a natural cooling state, and then sliced and crushed, the particles after crushing are passed through a 4 mm vibrating screen, and the undersize material is used as the elastic particles for standby.

[0016] A preparation method of a disc type friction plate with a quickly repairable mating surface, comprising the following steps:

[0017] S1, mixing: first, mix the fiber materials uniformly, and then mix the powder materials uniformly, the fiber materials include aramid fiber, steel fiber, and elastic particles, and the powder materials include phenolic resin, synthetic graphite, graphite coke, barium sulfate, chabazite, vermiculite, and iron oxide black; the reinforcing fibers are added first, and the powder materials are added later to prevent the fine powder materials from accumulating in the mixing equipment and causing uneven mixing.

[0018] S2, plastic pressure: the mixed plastic pressure material in S1 is added to a four-cavity mold for hot pressing;

[0019] Preferably, the hot pressing temperature is 165-175℃, the hot pressing time is 10-14 min, and the pressure is 180±10 kgf / cm 2 The hot pressing temperature is set as the optimal curing temperature of the phenolic resin, a temperature that is too low will result in insufficient product strength and reduced wear resistance, and a temperature that is too high will cause the product to delaminate directly in the mold and be scrapped; the hot pressing time is set as the optimal curing time of the phenolic resin, a time that is too short will result in insufficient product strength and a friction coefficient that does not meet the standard, and a time that is too long will result in energy waste; the pressure is set according to the shrinkage characteristics of each component material, a pressure that is too low will cause local looseness in the product, and a pressure that is too high will cause the adhesive to overflow out of the mold cavity.

[0020] S3, curing: the hot-pressed semi-finished product of S2 is subjected to temperature rising and curing treatment, and after completion, it is cooled to obtain the friction plate.

[0021] Preferably, the temperature is raised in steps from 0-180℃, and / or the heat treatment time is 10-12 h.

[0022] Stepwise temperature rise: namely, slowly rising in each temperature section, which can prevent the internal structure of the friction plate from delaminating due to sudden heating and cooling, thereby causing the friction plate to break during use. The friction plate is a composite material containing a binder, fibers, powder fillers, friction-reducing and friction-increasing materials. Each material has a completely different shrinkage and expansion rate during the heating process. If the stepwise temperature rise method is not used for heat treatment, the product is likely to delaminate, affecting the later machining, installation and use of the product. If the heat treatment temperature is too low or the time is too short, the heat treatment is insufficient, which causes the product to wear out during the later use process, shortens the service life; if the heat treatment temperature is too high, greater than 200 DEG C, the friction plate will directly delaminate and be scrapped; if the heat treatment time is too long, it will increase the power consumption, and there is no gain in product performance.

[0023] Compared with the prior art, the beneficial effects of the present scheme are:

[0024] 1. The present scheme first uses polytetrafluoroethylene, nitrile rubber, synthetic graphite, titanium dioxide, flaky graphite, aluminum oxide, magnesium oxide, carbon fiber, barium sulfate, sulfur, antioxidant, zinc oxide to prepare elastic particles, and then mixes the elastic particles with the remaining components to prepare a friction plate. The elastic particles can precipitate liquid substances under high-temperature braking conditions: under the action of repeated braking force, they are coated and embedded on the surface of the brake disc to repair the mating surface. If the elastic particles are not prepared first, polytetrafluoroethylene cannot be precipitated, and the repair of the mating surface cannot be completed during braking.

[0025] 2. When the friction plate prepared by the present scheme repairs the brake disc, the adhering substances on the surface of the brake disc are derived from the grinding dust generated by friction and wear, as well as a part of the phenolic resin and polytetrafluoroethylene binder. The adhering layer on the surface of the brake disc can block the direct friction between the metal-based friction material and the brake disc, thereby avoiding the generation of friction welding. The generation of plowing wear is avoided, and the occurrence of grooves and concave-convex on the surface of the brake disc is reduced. DETAILED DESCRIPTION

[0026] In order to enable the personnel in the technical field to better understand the present scheme, the technical scheme of the present application will be further described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0027] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments.

[0028] Embodiment 1

[0029] A disc type friction plate with quickly repairable mating surfaces is prepared by the following method:

[0030] Preparation of elastic particles:

[0031] The elastic particles comprise the following components: 20-mesh polytetrafluoroethylene 7%, block nitrile rubber 12%, 80-mesh synthetic graphite 10%, 200-mesh titanium white powder 8%, 200-mesh flaky graphite 18%, 200-mesh calcined alumina 7%, 200-mesh light magnesium oxide 8%, carbon fiber filament 8%, 200-mesh precipitated barium sulfate 20%, 200-mesh sulfur 1%, 100-mesh antioxidant 0.5%, and 100-mesh zinc oxide 0.5%.

[0032] T1, internal mixing: start with the downward movement of the internal mixer ram, the material pressure in the hopper is 2.5 MPa, the hopper is cooled throughout the process, the maximum alarm temperature of the internal mixer is 96-100°C, the rotor speed is 40 rpm, and the internal mixing time is 12-15 min.

[0033] T2, roll mixing: after the internal mixed material is crushed and cooled, roll mixing is started, the roll mixing speed is 22 rpm, the double roll cylinder is cooled throughout the process, the double roll gap is 2.5-2.8 mm, and the roll mixing time is 245 s.

[0034] T3, crushing: after the roll-mixed elastic material is naturally cooled, it is cut and crushed, the crushed particles pass through a 4 mm vibrating screen, the undersize material is the elastic particles ready for use, and the oversize material is further crushed until the required particle size is reached.

[0035] Preparation of a friction plate:

[0036] The friction plate comprises the following components: 200-mesh phenolic resin 13%, 80-mesh synthetic graphite 8%, 80-mesh graphite coke 6%, 00# steel fiber 18%, 200-mesh precipitated barium sulfate 20%, 100-mesh chabazite 6%, 80-mesh vermiculite 6%, aramid fiber 4%, 200-mesh iron oxide black 4%, and elastic particles 15%.

[0037] S1, mixing: the above raw materials are added to a plow mixer according to the principle of mixing fiber materials (steel fiber, aramid fiber, and elastic particles) first and then adding powder materials (phenolic resin, synthetic graphite, graphite coke, precipitated barium sulfate, chabazite, vermiculite, and iron oxide black), and the mixture is uniformly mixed at a device speed of 200 rpm for 12 min.

[0038] S2, plastic pressing: the mixed plastic pressing material is divided and packed, and then pressed in a 250T isometric press and a 29087 four-cavity mold, with a pressing time of 10-14 min, a hot pressing temperature of 165-175°C, and a pressure of 180±10 kgf / cm 2 .

[0039] S3, curing: the hot-pressed semi-finished product obtained in S2 is subjected to heat treatment curing in an electric heating oven, a temperature rising program is performed to rise in steps of 0-180℃, the heat treatment time is 10-12h, after cooling and taking out of the oven, machining is performed, the size meets the assembly requirement, and the test piece is No. 1 sample.

[0040] Example 2

[0041] A disc type friction plate with a quickly repairable mating surface is prepared by the following method:

[0042] Preparation of elastic particles:

[0043] The elastic particles comprise the following components: 20-mesh polytetrafluoroethylene 5%, block butadiene rubber 10%, 80-mesh synthetic graphite 8%, 200-mesh titanium white 8%, 200-mesh flaky graphite 16%, 200-mesh calcined alumina 5%, 200-mesh light magnesium oxide 7%, carbon fiber filament 5%, 200-mesh precipitated barium sulfate 16%, 200-mesh sulfur 1.5%, 100-mesh antioxidant 0.3%, and 100-mesh zinc oxide 0.3%.

[0044] T1, internal mixing: the internal mixer is started with the upper pin going down, the material bin pressure is 3.0Mpa, the material bin is fully cooled, the highest alarm temperature of the internal mixer is 96-100℃, the rotor speed is 35rpm, and the internal mixing time is 12-15min.

[0045] T2, roll mixing: after the internal mixed material is crushed and cooled, roll mixing is started, the roll mixing speed is 23rpm, the double rollers are fully cooled, the double roll gap is 2.5-2.8mm, and the roll mixing time is 260s.

[0046] T3, crushing: after the elastic material after roll mixing is naturally cooled, slicing and crushing are performed, the particles after crushing pass through a 4mm vibrating screen, the undersize material is the elastic particles for standby, and the oversize material is continuously crushed until the process required particle size is reached.

[0047] Preparation of a friction plate:

[0048] The friction plate comprises the following components: 200-mesh phenolic resin 11%, 80-mesh synthetic graphite 5%, 80-mesh graphite coke 8%, steel fiber 16%, 200-mesh precipitated barium sulfate 15%, 100-mesh chabazite 8%, 80-mesh vermiculite 8%, aramid fiber 2%, 200-mesh iron oxide black 4%, and elastic particles 11%.

[0049] S1, mixing: the above-mentioned raw materials are added in the order of mixing fiber materials (steel fiber, aramid fiber, elastic particle) first and powder materials (phenolic resin, synthetic graphite, graphite coke, precipitated barium sulfate, chabazite, vermiculite, iron oxide black) later in a plowshare mixer, the equipment rotation speed is 200 rpm, and the mixing time is 12 min.

[0050] S2, plastic pressing: the mixed plastic pressing material is divided into batches, and then pressed in a 250T isometric press and a 29087 four-cavity mold, the pressing time is 10-14 min, the hot pressing temperature is 165-175℃, and the pressure is 180±10 kgf / cm2.

[0051] S3, curing: the hot-pressed semi-finished product obtained in S2 is heat treated and cured in an electric heating oven, the temperature rising program is executed in a stepwise manner from 0 to 180℃, the heat treatment time is 10-12 h, and after cooling and taking out of the oven, machining is performed, and the size meets the assembly requirements.

[0052] Example 3

[0053] A disc friction plate capable of quickly repairing a mating surface is prepared by the following method:

[0054] Preparation of elastic particles:

[0055] The elastic particles comprise the following components: 20-mesh polytetrafluoroethylene 8%, block nitrile rubber 13%, 80-mesh synthetic graphite 9%, 200-mesh titanium dioxide 7%, 200-mesh flaky graphite 15%, 200-mesh calcined alumina 6%, 200-mesh light magnesium oxide 6%, carbon fiber filament 7%, 200-mesh precipitated barium sulfate 18%, 200-mesh sulfur 0.5%, 100-mesh antioxidant 0.4%, and 100-mesh zinc oxide 0.2%.

[0056] T1, internal mixing: the internal mixer starts with the upper pin going down, the material pressure in the bin is 2.5 Mpa, the cooling water is circulated in the bin throughout the process, the maximum alarm temperature of the internal mixer is 96-100℃, the rotor rotation speed is 30 rpm, and the internal mixing time is 12-15 min.

[0057] T2, roll mixing: after the internal mixed material is crushed and cooled, roll mixing is started, the roll mixing rotation speed is 20 rpm, the cooling water is circulated in the double rollers throughout the process, the double roller gap is 2.5-2.8 mm, and the roll mixing time is 275 s.

[0058] T3, crushing: after the roll-mixed elastic material is naturally cooled, it is cut and crushed, the crushed particles pass through a 4 mm vibrating screen, the undersize material is the elastic particles ready for use, and the oversize material is continuously crushed until the required particle size is reached.

[0059] Preparation of a friction plate:

[0060] The friction plate comprises the following components: 200-mesh phenolic resin 10%, 80-mesh synthetic graphite 7%, 80-mesh graphite coke 6%, steel fiber 15%, 200-mesh precipitated barium sulfate 18%, 100-mesh chabazite 5%, 80-mesh vermiculite 6%, aramid fiber 4%, 200-mesh iron oxide black 5%, and elastic particles 15%.

[0061] S1, mixing: the above-mentioned raw materials are sequentially added in a plow mixer according to the principle of mixing fiber materials (steel fiber, aramid fiber, and elastic particles) first and then adding powder materials (phenolic resin, synthetic graphite, graphite coke, precipitated barium sulfate, chabazite, vermiculite, and iron oxide black), the equipment rotation speed is 200 rpm, and the mixing time is 12 min.

[0062] S2, plastic pressing: the mixed plastic pressing material is divided into batches, and then pressed in a 250T isometric press and a 29087 four-cavity mold, the pressing time is 10-14 min, the hot pressing temperature is 165-175℃, and the pressure is 180±10 kgf / cm2.

[0063] S3, curing: the hot-pressed semi-finished product obtained in S2 is heat treated and cured in an electric heating oven, the temperature rising program is executed in a stepwise manner from 0-180℃, the heat treatment time is 10-12 h, and after cooling and taking out of the oven, machining is performed, and the size meets the assembly requirements.

[0064] Comparative Example 1

[0065] The difference between Comparative Example 1 and Example 1 is that the step of preparing elastic particles is not performed, and the raw materials of the elastic particles are directly mixed with the raw materials of the friction plate in a plow mixer. Specifically, the equipment rotation speed is 200 rpm, the mixing time is 12 min, the raw materials are sequentially added according to the principle of mixing fiber materials first and then adding powder materials, the mixed plastic pressing material is divided into batches, and then pressed in a 250T isometric press and a 29087 four-cavity mold, the pressing time is 10-14 min, the hot pressing temperature is 165-175℃, and the pressure is 180±10 kgf / cm2. 2 The hot-pressed semi-finished product is heat treated and cured in an electric heating oven, the temperature rising program is executed in a stepwise manner from 0-180℃, the heat treatment time is 10-12 h, and after cooling and taking out of the oven, machining is performed, and the size meets the assembly requirements. The test piece is No. 2 sample.

[0066] Performance test

[0067] In a 1:1 inertia test bench, a 22.5-inch air pressure disc brake is respectively replaced with No. 1 sample and No. 2 sample friction plate, and a HT250 brake disc, and the brake inertia is 1396 kg m 2, the brake air pressure is 0.8 Mpa, the continuous braking is 6 times at the speed of 60 km / h, the braking time is 5 s, the braking interval is 15 s, the highest braking temperature of the No. 1 sample is 312℃, and the highest braking temperature of the No. 2 sample is 362℃. After the disc is cooled, an adhesive layer appears on the surface of the brake disc, the adhesion of the adhesive layer is verified by the paint film grid experiment, and the wear of the brake disc and the wear of the friction plate are observed. Under the above conditions, the continuous braking is 10 times at the speed of 60 km / h, and the cycle is 50 times, the highest braking temperature of the No. 1 sample reaches 509℃, and the highest braking temperature of the No. 2 sample reaches 553℃. The adhesion of the adhesive layer is verified by the paint film grid experiment, and the wear of the brake disc and the wear of the friction plate are observed. The results are shown in Table 1.

[0068] Table 1: Test results of high temperature resistance, tensile resistance and wear resistance of the friction plate

[0069]

[0070] As shown in Table 1, when the elastic particles and the components of the friction plate are directly mixed without preparing the elastic particles, the high temperature resistance of the friction plate prepared in Comparative Example 1 is poor, and the wear of the brake pad and the friction plate is more serious. Through the adhesive layer paint film grid test, it can be known that the adhesion ability of the adhesive layer generated during braking of the friction plate obtained in Comparative Example 1 is obviously weaker than that of Example 1. Through the adhesive layer dragging test, it can be known that the friction coefficient of uop2 increases after the adhesive layer is bonded, which indicates that the friction plate prepared by the scheme can improve the roughness of the mating surface after repairing the mating surface, improve the service life of the mating surface, and complete the repair.

[0071] The above specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, as long as the modifications are within the scope of the claims of the present application.

Claims

1. A disc type friction plate capable of quickly repairing a mating surface, characterized by, The friction plate is prepared from the following components in mass ratio: phenolic resin 10%-13%, synthetic graphite 5%-8%, graphite coke 5%-8%, steel fiber 15%-20%, barium sulfate 15%-20%, chabazite 5%-8%, vermiculite 5%-8%, aramid fiber 2%-4%, iron oxide black 3%-5%, elastic particle 10%-15%; The phenolic resin, barium sulfate and iron oxide black are 200 mesh, the synthetic graphite, graphite coke and vermiculite are 80 mesh, and the chabazite is 100 mesh; The elastic particle is prepared from the following components in mass ratio: polytetrafluoroethylene 5%-8%, nitrile rubber 10%-13%, synthetic graphite 8%-10%, titanium dioxide 5%-8%, flake graphite 15%-18%, aluminum oxide 5%-7%, magnesium oxide 6%-8%, carbon fiber 5%-8%, barium sulfate 15%-20%, sulfur 0.5%-1.5%, antioxidant 0.3%-0.5%, and zinc oxide 0.2%-0.5%; In the elastic particle, the titanium dioxide, flake graphite, aluminum oxide, magnesium oxide, barium sulfate and sulfur are 200 mesh; the antioxidant and zinc oxide are 100 mesh; the polytetrafluoroethylene is 10 mesh; and the synthetic graphite is 80 mesh; The elastic particle is prepared by a method comprising the following steps: T1, mixing: the raw materials are added into a mixer according to the proportion, and mixing is started, the material bin pressure is 2.5-3.0 Mpa, the material bin is cooled throughout the process, the mixer alarm temperature is 96-100℃, the rotor speed is 30-40 rpm, and the mixing time is 12-15 min; T2, roll mixing: the mixed material in T1 is crushed and cooled, and then roll mixing is started, the roll mixing speed is 20-25 rpm, the double roll is cooled throughout the process, the double roll gap is 2.5-2.8 mm, and the roll mixing time is 240-280 s; T3, crushing: the roll-mixed elastic material is placed in a natural cooling state, and then slicing and crushing are performed, the particles are passed through a 4 mm vibrating screen, and the undersize material is the elastic particle for standby use.

2. A disc type friction plate capable of quickly repairing a mating surface according to claim 1, wherein In T1, the feeding sequence is: nitrile rubber and polytetrafluoroethylene are added first, mixing for 2 min; then titanium dioxide, flake graphite, aluminum oxide, magnesium oxide, barium sulfate, carbon fiber and synthetic graphite are added, mixing for 3 min; finally, sulfur, antioxidant and zinc oxide are added, mixing for 7-10 min.

3. A method of manufacturing a disc type friction plate having a pair of surfaces capable of being quickly repaired according to claim 1, wherein The method comprises the following steps: S1, mixing: the fiber materials are mixed according to the proportion, and then the powder materials are added and mixed according to the proportion; S2, plastic pressing: the mixed plastic pressing material in S1 is added into a four-cavity mold for hot pressing; S3, curing: the hot-pressed semi-finished product in S2 is subjected to temperature rising curing treatment, and then cooled after completion, to obtain the friction plate.

4. A method of manufacturing a disc type friction plate having a pair of surfaces capable of being quickly repaired according to claim 3, wherein In S2, the hot-pressing temperature is 165-175℃; and / or the hot-pressing time is 10-14 min; and / or the pressure is 180±10 kgf / cm 2 .

5. A method of manufacturing a disc type friction plate having a pair of surfaces capable of being quickly repaired according to claim 3, wherein In S3, the temperature rising is performed in a stepwise manner at 0-180℃; and / or the heat treatment time is 10-12 h.

Images