An organic synthetic friction body, a brake pad and a preparation method thereof

Abstract

The present invention discloses an organic synthetic friction body, a brake pad and a preparation method thereof, which relate to the field of processing and manufacturing of transportation parts. To ensure that the brake pad has characteristics such as wear resistance and a low thermal conductivity coefficient, so that the brake pad is not prone to abnormal wear and noise, thereby solving the problems of deviation of braking distance and abnormal wear of the brake pad during the braking process of the powder metallurgy brake pad, and reducing the influence of the brake pad on the motor speed. The brake pad includes: a steel back, the organic synthetic friction body provided by the present invention, a plurality of fixing rings and a plurality of grab pins, and the organic synthetic friction body is an integral organic synthetic friction body; the plurality of fixing rings and the plurality of grab pins are both fixed on the steel back, and the plurality of grab pins fix the organic synthetic friction body on the steel back. The brake pad is applied to urban rail transportation.

Description

Technical Field

[0001] The present invention relates to the field of processing and manufacturing of parts of transportation products, and particularly to an organic synthetic friction body, a brake pad and a preparation method thereof. Background Art

[0002] With the progress of technology and the development of urban rail transit, the straddle monorail transit system has gradually matured and improved. Compared with traditional double-rail trains, straddle monorail trains have many advantages such as strong adaptability, low noise, small turning radius, and very strong climbing ability. The straddle monorail train uses a hydraulic braking system to replace the pneumatic braking system of traditional double-rail trains. And due to space structure limitations, the brake disc of the straddle monorail train is placed between the motor and the reducer. This structure means that the straddle monorail brake pad needs to face higher speeds and more intense heat conduction during the braking process.

[0003] In the prior art, most straddle monorail brake pads use powder metallurgy brake pads. However, due to the high thermal conductivity coefficient of powder metallurgy brake pads, it is easy to cause problems such as an increase in the temperature of the hydraulic oil in the braking system due to the heat conduction of the brake pads during the braking process of the vehicle, resulting in deviation of the braking distance, abnormal wear of the brake pads, and affecting the motor speed. Summary of the Invention

[0004] The purpose of the present invention is to provide an organic synthetic friction body, a brake pad and a preparation method thereof, so as to ensure that the brake pad has characteristics such as wear resistance and low thermal conductivity coefficient, so that the brake pad is not prone to abnormal wear and noise, thereby solving the problems of deviation of the braking distance and abnormal wear of the brake pad during the braking process of the powder metallurgy brake pad, and reducing the influence of the brake pad on the motor speed.

[0005] In order to achieve the above purpose, the present invention provides an organic synthetic friction body. The organic synthetic friction body includes:

[0006] Liquid latex, nitrile rubber powder, organosilicon-modified phenolic resin, rubber accelerator, copper fiber, steel fiber, mineral fiber, carbon fiber, metal filler and inorganic filler.

[0007] Compared with the prior art, in the organic synthetic friction body provided by the present invention, copper fibers, steel fibers, mineral fibers and carbon fibers are used as reinforcing fibers, which enhance the strength of the friction material. Moreover, since the reinforcing fibers contain not only steel fibers but also copper fibers and carbon fibers, the copper fibers and carbon fibers have good thermal conductivity, which can improve the thermal conductivity of the friction material and make the heat evenly distributed on the friction body. At the same time, the metal fillers and inorganic fillers contained in the organic synthetic friction body can keep the friction coefficient of the friction body stable and improve its wear resistance. Based on this, the organic synthetic friction body provided by the present invention has good wear loss, stable friction coefficient, is not prone to abnormal wear, and thus reduces the possibility of brake distance deviation.

[0008] In addition, using liquid latex, nitrile rubber powder, silicone-modified phenolic resin and rubber accelerator as binders to coat and integrate the reinforcing fibers, metal fillers and inorganic fillers can improve the high-temperature resistance of the organic synthetic friction body and reduce the thermal conductivity of the organic synthetic friction body to a certain extent. At the same time, the binder in this organic synthetic friction body is different from the binder in the powder metallurgy friction body. Its texture is soft and elastic. Therefore, the organic synthetic friction body provided by the present invention can also reduce the generated noise during braking and inhibit the problem of the increase in the temperature of the hydraulic oil in the braking system caused by the too fast heat conduction of the brake pad, so as to minimize the impact on the motor speed.

[0009] The present invention also provides a preparation method of an organic synthetic friction body, which is applied to the above-mentioned organic synthetic friction body. The preparation method of the organic synthetic friction body includes:

[0010] Mix liquid latex, nitrile rubber powder, silicone-modified phenolic resin, rubber accelerator, copper fibers, steel fibers, mineral fibers, carbon fibers, metal fillers and inorganic fillers evenly, and carry out internal mixing to obtain an organic synthetic friction body.

[0011] Compared with the prior art, in the preparation method of the organic synthetic friction body provided by the present invention, by only mixing the raw material components evenly and then carrying out short-time low-temperature internal mixing, an organic synthetic friction body with the above beneficial effects can be obtained. This preparation method is simple, low in cost and high in feasibility.

[0012] The present invention also provides a brake pad, which includes: a steel back, an organic synthetic friction body, a plurality of fixing rings and a plurality of grab pins. The organic synthetic friction body is an integral organic synthetic friction body, and the organic synthetic friction body is the organic synthetic friction body described in the above technical solution;

[0013] A plurality of the fixing rings and a plurality of the grab pins are both fixed on the steel back, and the plurality of grab pins fix the organic synthetic friction body on the steel back.

[0014] Compared with the prior art, in the brake pad provided by the present invention, the friction block is an integrally structured organic synthetic friction body, which has a low thermal conductivity coefficient, a stable friction coefficient, is not prone to wear, and can also reduce the noise during braking. Therefore, the above-mentioned brake pad has the characteristics of good wear amount, stable friction coefficient, not prone to abnormal wear, not prone to noise, and low thermal conductivity coefficient, and can solve problems such as deviation of braking distance, abnormal wear of the brake pad, and influence on the motor speed during the braking process of the powder metallurgy brake pad.

[0015] The present invention also provides a preparation method of a brake pad, which is characterized in that it is applied to the above-mentioned brake pad, and the preparation method of the brake pad includes:

[0016] Fix a plurality of the fixing rings on the steel back;

[0017] Fix a plurality of the material grabbing pins on the steel back;

[0018] Press the steel back and the organic synthetic friction body described in the above technical solution together to obtain a brake pad; the plurality of material grabbing pins fix the organic synthetic friction body on the steel back.

[0019] Compared with the prior art, the beneficial effects of the preparation method of the brake pad provided by the present invention are the same as those of the brake pad provided by the above technical solution, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 is a basic flowchart of a preparation method of an organic synthetic friction body provided by an embodiment of the present invention;

[0022] Figure 2 is a process of a preparation method of an organic synthetic friction body provided by an embodiment of the present invention Figure 1 ;

[0023] Figure 3 is a process of a preparation method of an organic synthetic friction body provided by an embodiment of the present invention Figure 2 ;

[0024] Figure 4 is a process of a preparation method of an organic synthetic friction body provided by an embodiment of the present invention Figure 3 ;

[0025] Figure 5 is a schematic diagram of the overall structure of a brake pad provided by an embodiment of the present invention;

[0026] Figure 6 is Figure 5 The left view of the brake pad structure obtained along the A-A direction;

[0027] Figure 7 The top view of an overall brake pad structure provided by an embodiment of the present invention;

[0028] Figure 8 The schematic diagram of the steel back structure of a brake pad provided by an embodiment of the present invention;

[0029] Figure 9 is Figure 8 The left view of the steel back structure obtained along the A-A direction;

[0030] Figure 10 The top view of the steel back structure of a brake pad provided by an embodiment of the present invention;

[0031] Figure 11 The partial sectional view of the fixing ring structure of a brake pad provided by an embodiment of the present invention;

[0032] Figure 12 The top view of the fixing ring structure of a brake pad provided by an embodiment of the present invention;

[0033] Figure 13 The half sectional view of the fixing ring structure of a brake pad provided by an embodiment of the present invention;

[0034] Figure 14 The partial sectional view of the material grabbing pin structure of a brake pad provided by an embodiment of the present invention;

[0035] Figure 15 The half sectional view of the material grabbing pin structure of a brake pad provided by an embodiment of the present invention;

[0036] Figure 16 The schematic diagram of the organic friction body structure of a brake pad provided by an embodiment of the present invention;

[0037] Figure 17 is Figure 16 The left view of the organic friction body structure obtained along the A-A direction;

[0038] Figure 18 The top view of the organic friction body structure of a brake pad provided by an embodiment of the present invention;

[0039] Figure 19 The flowchart of the preparation method of a brake pad provided by an embodiment of the present invention. Specific embodiments

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] With the increase in the speed of modern transportation vehicles, in order to ensure better braking performance, the performance requirements for brake pads are getting higher and higher. During braking, the brake pads directly rub against the wheels to hold the wheel tread tightly and make the vehicle stop. The performance of the friction material used in the brake pads directly determines whether good braking performance can be achieved through a short braking time at a very high driving speed.

[0046] Embodiment 1

[0047] An embodiment of the present invention provides an organic synthetic friction body, comprising: liquid latex, nitrile rubber powder, silicone-modified phenolic resin, rubber accelerator, copper fiber, steel fiber, mineral fiber, carbon fiber, metal filler and inorganic filler.

[0048] The above-mentioned organic synthetic friction body is a polymer ternary composite material, which is composed of a binder, reinforcing fibers and fillers. Among them, the binder can bond other components together to form a whole and transfer and balance the load. The components of the binder include liquid latex, nitrile rubber powder, silicone-modified phenolic resin and rubber accelerator.

[0049] Specifically, the liquid latex has high film-forming strength, adhesion and wear resistance, as well as good stability and fluidity. Moreover, the liquid latex has good compatibility with fillers and excellent storage stability. The nitrile rubber powder has the advantages of good dispersibility, easy operability, particle refinement and reduced labor intensity, and is widely used in the processing and performance improvement of rubber products and resin modification. The silicone-modified phenolic resin has excellent heat resistance and moisture resistance, so it can be used as an instantaneous high-temperature resistant material and used as ablation materials for rockets, missiles, brake pads, etc. The rubber accelerator can crosslink most polymers, and the crosslinked product has small compression set, no pollution and good heat resistance, and has a relatively high melting point and decomposition temperature, and can be stored at room temperature for a long time. By jointly using liquid latex, nitrile rubber powder, silicone-modified phenolic resin and rubber accelerator, the mechanical and physical properties of the friction material are ensured while the bonding performance between the friction material and the steel back is enhanced.

[0050] The above-mentioned reinforcing fibers mainly play a role in strengthening, load-bearing and friction increasing in the friction material. The fiber-reinforced material forms the base material of the friction material, making the organic synthetic friction body have sufficient mechanical strength to withstand the grinding and riveting processing load forces during the production process of the friction plate and the impact forces, shear forces and pressure generated during the use process due to braking and transmission. The components of the reinforcing fibers include copper fiber, steel fiber, mineral fiber and carbon fiber.

[0051] Specifically, compared with asbestos, steel fibers and copper fibers have the characteristics of simple processing technology, low noise, corrosion resistance and long service life. Moreover, the brake pads prepared with asbestos will generate a large amount of carcinogenic substances due to high-temperature gasification caused by friction. And, compared with the synthetic brake pads prepared with traditional steel fibers, adding copper fibers can further improve the thermal conductivity of the product, prevent heat accumulation, and thus reduce the damage of heat to the binder. In addition, the above-mentioned mineral fiber is a composite mineral fiber processed by combining natural mineral fiber and artificial fiber, with relatively low manufacturing cost. This composite mineral fiber has the advantages of higher heat resistance than asbestos and enhanced effect meeting the mechanical strength requirements of brake pads. The above-mentioned carbon fiber is a fibrous carbon material with a carbon content exceeding 90%, which is prepared by high-temperature solid-phase reaction processes such as pre-oxidation, carbonization, and graphitization of raw filaments such as polyacrylonitrile fiber, viscose fiber, and pitch fiber, and is composed of graphite microcrystals with preferred orientation, so it has high strength and elastic modulus. Therefore, by using copper fibers, steel fibers, mineral fibers, carbon fibers, etc. in combination as reinforcing fibers in the friction material, the above-mentioned organic synthetic friction body has good thermal conductivity at the friction working temperature, so that the heat is evenly distributed on the friction body, and there will be no phenomena of fusing, carbonization and thermal decomposition.

[0052] The above-mentioned fillers include metal fillers and inorganic fillers. As fillers in the friction material, they are mainly composed of friction property regulators and compounding agents.

[0053] As a possible implementation, the inorganic filler may include alumina, molybdenum disulfide, calcium carbonate, barium sulfate, and glass microspheres, but not limited thereto. Alumina can use γ-alumina, which has the properties of high hardness and high temperature resistance and can stabilize the fade of the organic synthetic friction body. In addition, glass microspheres have the advantages of light weight, low thermal conductivity, relatively high strength, and good chemical stability. Its surface is specially treated to have lipophilic and hydrophobic properties, and it is very easy to disperse in the organic material system, can be filled in most thermosetting and thermoplastic resins, and it can keep the friction coefficient of the friction material stable, especially ensuring the friction coefficient stability in a humid environment. Molybdenum disulfide has excellent anti-wear and friction-reducing properties, can improve the hardness, compressive strength and friction coefficient of the material, and reduce wear. Both calcium carbonate and barium sulfate can improve the wear resistance and the stability of the friction coefficient of the product.

[0054] In an implementable manner, the above metal fillers may include: cast iron powder, copper powder, tin powder, magnetite, etc. Iron has excellent friction properties at high temperatures, high mechanical strength, can withstand large pressures, and has a strong affinity with the counter material. Adding other elements can alloy iron to reduce its plasticity and improve its strength, yield limit, and hardness. Adding copper powder can improve the thermal conductivity of the friction material. Adding tin powder can make the friction material have high heat resistance, strength, and hardness, and can accelerate the alloying process. Therefore, the metal filler composed of cast iron powder, copper powder, tin powder, and magnetite can increase the friction coefficient of the organic synthetic friction body at high temperatures and reduce wear.

[0055] The filler components in the above organic synthetic friction body can be divided into friction-increasing fillers and friction-reducing fillers. The friction-increasing fillers are mainly hard fillers, which are mainly used to control the hardness of the friction fillers. The friction-reducing fillers can not only reduce the friction coefficient but also reduce the wear of the friction material, thereby improving the service life of the friction material. For example, the friction-increasing fillers in the organic synthetic friction body include alumina, cast iron powder, copper powder, calcium carbonate, barium sulfate, and magnetite, and the friction-reducing fillers include molybdenum disulfide, glass microspheres, and tin powder. By mixing the friction-increasing fillers and friction-reducing fillers in a certain proportion, the organic synthetic friction body can maintain good performance.

[0056] In the organic synthetic friction body provided by the embodiment of the present invention, purple copper fibers, steel fibers, mineral fibers, and carbon fibers are used as reinforcing fibers to enhance the strength of the friction material. Moreover, since the reinforcing fibers contain not only steel fibers but also purple copper fibers and carbon fibers, the purple copper fibers and carbon fibers have good thermal conductivity, which can improve the thermal conductivity of the friction material and make the heat evenly distributed on the friction body. At the same time, the inorganic fillers contained in the organic synthetic friction body can keep the friction coefficient of the friction body stable and improve its wear resistance. Based on this, the organic synthetic friction body provided by the present invention has good wear loss, stable friction coefficient, is not prone to abnormal wear, and further reduces the possibility of brake distance deviation.

[0057] In addition, using liquid latex, nitrile rubber powder, organosilicon-modified phenolic resin, and rubber accelerator as binders to coat and integrate the reinforcing fibers and inorganic fillers can improve the high-temperature resistance of the organic synthetic friction body and can reduce the thermal conductivity of the organic synthetic friction body to a certain extent. At the same time, the binder in the organic synthetic friction body is different from the binder in the powder metallurgy friction body, and its texture is softer and elastic. Therefore, the organic synthetic friction body provided by the present invention can also reduce the noise generated during braking and inhibit the problem of the increase in the temperature of the hydraulic oil in the braking system caused by the too-fast heat conduction of the brake pad, thereby minimizing the impact on the motor speed.

[0058] To ensure that the above-mentioned organic synthetic friction material has the best performance, the raw materials of the organic synthetic friction material, by mass fraction, include: the mass fraction of liquid latex is 5% - 10%, the mass fraction of nitrile rubber powder is 4% - 8%, the mass fraction of organosilicon-modified phenolic resin is 8% - 10%, the mass fraction of alumina is 0.5% - 4%, the mass fraction of molybdenum disulfide is 6% - 10%, the mass fraction of calcium carbonate is 6% - 10%, the mass fraction of barium sulfate is 4% - 8%, the mass fraction of purple copper fiber is 7.5% - 12%, the mass fraction of steel fiber is 13% - 18%, the mass fraction of mineral fiber is 2% - 6%, the mass fraction of carbon fiber is 0.5% - 2%, the mass fraction of glass microspheres is 0.5% - 2%, the mass fraction of cast iron powder is 3% - 6%, the mass fraction of copper powder is 1% - 3%, the mass fraction of tin powder is 8% - 10%, the mass fraction of magnetite is 2% - 8%, and the mass fraction of rubber accelerator is 0.5% - 1.5%.

[0059] When the organic synthetic friction material is formed by using the raw material components with the above-mentioned mass fractions, the above-mentioned organic synthetic friction material formed by the mutual cooperation among the raw material components is not easily decomposed at high temperatures, and has the characteristics of good wear loss, stable friction coefficient, not easily generating abnormal wear, not easily generating noise, and low heat conduction coefficient, etc., which can solve the problems such as braking distance deviation, abnormal wear of the brake pad, and affecting the motor speed during the braking process of the powder metallurgy brake pad.

[0060] Example Two

[0061] The embodiment of the present invention provides a preparation method of an organic synthetic friction material. The preparation method of the organic synthetic friction material includes:

[0062] Mix liquid latex, nitrile rubber powder, organosilicon-modified phenolic resin, rubber accelerator, purple copper fiber, steel fiber, mineral fiber, carbon fiber, metal filler, and inorganic filler evenly, and carry out internal mixing to obtain an organic synthetic friction material. It should be understood that the components and proportions contained in the above-mentioned metal filler and inorganic filler are the same as those described above, and will not be elaborated here.

[0063] In this preparation method, liquid latex replaces the solvent to coat the friction material. Through only mixing the raw material components evenly and then carrying out short-time low-temperature internal mixing, an organic synthetic friction material with the above-mentioned beneficial effects can be obtained. This preparation method is simple, low in cost, and highly feasible.

[0064] As a possible implementation manner, as Figure 1 shown, the above-mentioned mixing of liquid latex, nitrile rubber powder, organosilicon-modified phenolic resin, rubber accelerator, purple copper fiber, steel fiber, mineral fiber, carbon fiber, metal filler, and inorganic filler evenly and carrying out internal mixing to obtain an organic synthetic friction material includes:

[0065] Step 100: Mix acrylonitrile-butadiene rubber powder, organosilicon-modified phenolic resin, and liquid latex evenly to obtain a first mixture.

[0066] Exemplarily, during the process of obtaining the first mixture, the liquid latex can be first injected into an automatic liquid filling device, and the automatic liquid filling device is used to automatically add the liquid latex into a mixing device. Then, the acrylonitrile-butadiene rubber powder and the organosilicon-modified phenolic resin are added to the mixing device, and the three are mixed evenly to obtain the first mixture.

[0067] For example, as Figure 2 shown, the above-mentioned mixing of acrylonitrile-butadiene rubber powder, organosilicon-modified phenolic resin, and liquid latex evenly to obtain a first mixture includes:

[0068] Step 101: Premix the acrylonitrile-butadiene rubber powder and the organosilicon-modified phenolic resin for 0.5 h to 1.5 h to obtain a first premix. For example, the weighed acrylonitrile-butadiene rubber powder and organosilicon-modified phenolic resin are put into a V-type mixer for premixing, and the premixing time is 0.5 to 1.5 hours, and a first premix can be obtained.

[0069] Step 102: Mix the above-mentioned first premix and the liquid latex for 2 min to 5 min to obtain a first mixture.

[0070] For example, after obtaining the first premix, turn on the automatic liquid filling device, and the device will automatically spray the liquid latex into a horizontal screw ribbon mixer. At this time, the premixed acrylonitrile-butadiene rubber powder and organosilicon-modified phenolic resin are put into the horizontal screw ribbon mixer for mixing operation, and the mixing time is 2 to 5 minutes. At this time, a first mixture can be obtained.

[0071] Step 200: Mix alumina, molybdenum disulfide, calcium carbonate, barium sulfate, copper fiber, steel fiber, mineral fiber, and carbon fiber evenly to obtain a second mixture.

[0072] Exemplarily, alumina, molybdenum disulfide, calcium carbonate, and barium sulfate are used as inorganic fillers and are mixed with the reinforcing fibers composed of copper fiber, steel fiber, mineral fiber, and carbon fiber to obtain a second mixture.

[0073] For example, as Figure 3 shown, the above-mentioned mixing of alumina, molybdenum disulfide, calcium carbonate, barium sulfate, copper fiber, steel fiber, mineral fiber, and carbon fiber evenly to obtain a second mixture includes:

[0074] Step 201: Premix alumina, molybdenum disulfide, calcium carbonate, barium sulfate, copper fiber, steel fiber, mineral fiber, and carbon fiber for 1 h to 2 h to obtain a second premix.

[0075] Put the weighed alumina, molybdenum disulfide, calcium carbonate, barium sulfate, purple copper fiber, steel fiber, mineral fiber, and carbon fiber into a vertical mixer for premixing for 1 to 2 hours to obtain a second premix.

[0076] Step 202: Mix the above-mentioned second premix for 3 min to 8 min to obtain a second mixture.

[0077] For example: Put the premixed alumina, molybdenum disulfide, calcium carbonate, barium sulfate, purple copper fiber, steel fiber, mineral fiber, and carbon fiber into a horizontal screw ribbon mixer for mixing for 3 to 8 minutes to obtain a second mixture.

[0078] Step 300: Mix glass beads, cast iron powder, copper powder, tin powder, magnetite, and rubber accelerator evenly to obtain a third mixture.

[0079] Exemplarily, mix the glass beads as an inorganic filler with the metal filler composed of cast iron powder, copper powder, tin powder, and magnetite, and the rubber accelerator evenly to obtain a third mixture.

[0080] For example: As Figure 4 shown, the above-mentioned mixing of glass beads, cast iron powder, copper powder, tin powder, magnetite, and rubber accelerator evenly to obtain a third mixture includes:

[0081] Step 301: Premix glass beads, cast iron powder, copper powder, tin powder, magnetite, and rubber accelerator for 1 h to 1.5 h to obtain a third premix.

[0082] Put the weighed glass beads, cast iron powder, copper powder, tin powder, magnetite, and rubber accelerator into a vertical two-way mixer for premixing for 1 to 2 hours to obtain a third premix.

[0083] Step 302: Mix the above-mentioned third premix for 4 min to 10 min to obtain a third mixture. For example, after obtaining the third premix, put the third premix into a horizontal screw ribbon mixer for mixing for 4 to 10 minutes to obtain a third mixture.

[0084] Step 400: Mix the first mixture, the second mixture, and the third mixture by internal mixing to obtain an internally mixed product. Here, the internal mixing process is different from the existing internal mixing process. It only needs to be briefly mixed in an internal mixer under low temperature and low pressure to obtain an internally mixed product, and then the internally mixed product is simply processed to obtain an organic synthetic friction material.

[0085] Exemplarily, the above-mentioned kneading of the first mixture, the second mixture and the third mixture to obtain a kneaded product includes: kneading the first mixture, the second mixture and the third mixture at 20°C to 50°C for 0.5 min to 3 min to obtain a kneaded product.

[0086] As a possible implementation method, after obtaining the kneaded product and before obtaining the organic synthetic friction body, the above-mentioned preparation method of the organic synthetic friction body further includes: processing the kneaded product into particles with a size of 3 mm to less than 9 mm to obtain the organic synthetic friction body.

[0087] For example, the material after kneading is placed into a crusher for crushing, and a crusher with a 3 mm to 9 mm screen is selected. The crushed mixture has smaller particle size and increased fluidity of the particles, making the components in the friction body mix more evenly.

[0088] Example Three

[0089] The embodiment of the present invention further provides a brake pad, which can be applied to trains such as monorail trains and multi-rail trains, vehicles such as cars, etc., but is not limited thereto. Cars include sedans, trucks, agricultural vehicles, etc., but are not limited thereto.

[0090] As Figures 5 - 7 shown, the brake pad includes: a steel back 1, an organic synthetic friction body 2, a plurality of fixing rings 3 and a plurality of grab pins 4. The above-mentioned organic synthetic friction body 2 is an integral organic synthetic friction body, and this organic synthetic friction body 2 is the organic synthetic friction body provided in the first embodiment of the present invention, and its preparation method is as described in the second embodiment of the present invention. A plurality of the above-mentioned fixing rings 3 and a plurality of grab pins 4 are both fixed on the steel back 1, and a plurality of grab pins 4 fix the organic synthetic friction body 2 on the steel back 1.

[0091] The above-mentioned organic synthetic friction body is the core component of the brake pad, that is, friction braking is achieved through the organic synthetic friction body. The fixing ring is the installation position of the brake pad, which is connected to the brake. The grab pin is mainly a component used to fix the organic synthetic friction body on the steel back during the formation of the organic synthetic friction body.

[0092] The brake pad provided by the embodiment of the present invention has an organic synthetic friction body with an integral structure as the friction component, which has a low thermal conductivity coefficient, a stable friction coefficient, is not prone to wear, and can also reduce the noise during braking. Therefore, the above-mentioned brake pad has characteristics such as good wear amount, stable friction coefficient, not prone to abnormal wear, not prone to noise, and low thermal conductivity coefficient, and can solve problems such as deviation of braking distance, abnormal wear of the brake pad, and influence on the motor speed during the braking process of the powder metallurgy brake pad.

[0093] As a possible implementation method, as Figures 8 - 10As shown in the figure, a plurality of first mounting holes 5, a plurality of second mounting holes 6 and a guiding hole 7 for connecting with a brake are provided on the above-mentioned steel back 1. A fixing ring 3 can be installed in the first mounting hole 5, and the guiding hole 7 can quickly and conveniently identify the direction of the brake pad. A material grabbing pin 4 can be installed in the second mounting hole 6, so that each material grabbing pin 4 can be installed in the corresponding second mounting hole 6. The plurality of second mounting holes 6 are radially arranged on the above-mentioned steel back 1.

[0094] The above-mentioned steel back can be in a fan-shaped structure, a rectangular structure, etc., but is not limited thereto, and can be determined according to the actual application scenario of the steel back. When the steel back is in a fan-shaped structure, during the braking process, since the steel back will hold the wheel tightly, the maximum contact area between the two is fan-shaped. Therefore, the shape of the steel back can be directly designed as a fan shape to achieve the maximum braking effect. As Figure 6 shown, since a plurality of first mounting holes 5, a plurality of second mounting holes 6 and a guiding hole 7 for connecting with a brake are provided on the steel back 1, the steel back 1 can be a fan-shaped structure with lugs at this time. The number of lugs can be determined according to the number of the first mounting holes 5 and the guiding hole 7.

[0095] The number of the above-mentioned first mounting holes is at least two. A fixing ring can be installed in each first mounting hole, and a chamfer structure is provided above the first mounting hole to facilitate the placement of the fixing ring. The number of the above-mentioned guiding holes can be one or more, but theoretically one guiding hole can achieve the guiding purpose. The number of the above-mentioned second mounting holes is a plurality. A material grabbing pin can be installed in each second mounting hole, and a chamfer structure is provided above the second mounting hole to facilitate the placement of the material grabbing pin.

[0096] Exemplarily, as Figure 8 shown, the guiding hole 7 is arranged at the lug position directly above the vertical center line of the steel back 1, and the number thereof is only one. The number of the first mounting holes 5 is two, and the two first mounting holes 5 are symmetrically arranged on both sides of the guiding hole 7. At this time, the distances between the first mounting holes 5 adjacent to both sides of the guiding hole 7 and the guiding hole 7 are equal. Since each fixing ring 3 is installed in the corresponding first mounting hole 5, the number of the fixing rings 3 is also two, and the distances from the two fixing rings 3 to the guiding hole 7 are equal. In addition, a plurality of second mounting holes 6 are arranged in the middle part of the fan shape of the steel back 1, and the plurality of second mounting holes 6 are arranged in two rows. There are 6 second mounting holes 6 above the horizontal center line of the steel back 1, and 4 second mounting holes 6 are arranged below the horizontal center line of the steel back 1, and are radially arranged on the steel back 1. A material grabbing pin 4 is installed in each second mounting hole 6, so the material grabbing pins 4 are also arranged in two rows and are distributed on the steel back 1 according to the arrangement mode of the second mounting holes 6.

[0097] In practical applications, the number of fixed rings and material grasping pins can be determined according to the actual situation. Therefore, the number of fixed rings can be less than 2 or more than 2. Similarly, the number of material grasping pins can be less than 10 or more than 10, which needs to be determined according to the shape and area of the steel back and the friction body. Preferably, if it can be ensured that there is a uniform distribution of one material grasping pin every 20 cm 2 ~30 cm 2 it is sufficient. In addition, the material grasping pins can be arranged in a single row or multiple rows, and the specific arrangement method depends on the specific situation.

[0098] The shapes of the above-mentioned multiple first mounting holes and multiple second mounting holes can be circular holes or square holes, as long as they are hole structures that can achieve their corresponding functions. However, when setting the above-mentioned hole structures, the shape of the fixed ring or the shape of the material grasping pin connected thereto needs to be considered. Similarly, the shape of the above-mentioned guiding hole can be a circular hole or a square hole, as long as it is a hole structure that can achieve its guiding function. However, since the guiding hole and the multiple first mounting holes need to be connected to the brake, preferably, the guiding hole and the multiple first mounting holes are set as circular holes. For example, as Figure 8 shown, the shapes of the first mounting hole 5 and the guiding hole 7 are circular holes.

[0099] In an alternative embodiment, as Figure 11 the structure of the above-mentioned fixed ring can include a first annular portion 9 and a second annular portion 10 connected together. The outer diameter of the first annular portion 9 is larger than the outer diameter of the second annular portion 10. The second annular portion 10 is installed in the first mounting hole from the inner side surface of the steel back by an interference fit method.

[0100] Exemplarily, as Figures 11 - 13 shown, the overall shape of the fixed ring is a combination of two hollow cylinders with different radii, that is, both the above-mentioned first annular portion 9 and the second annular portion structure 10 are hollow cylinders. Specifically, the first annular portion 9 is an upper cylinder, and the second annular portion 10 is a lower cylinder. The upper cylinder is located above the lower cylinder and is connected together. The outer diameter of the lower cylinder is larger than the outer diameter of the upper cylinder, and the inner diameter of the lower cylinder is equal to the inner diameter of the upper cylinder. An auxiliary installation groove for cooperating with the installation tool is provided at the top end of the upper cylinder of the fixed ring, so that when the installation tool cooperates with the auxiliary installation groove, the fixed ring can be quickly screwed into the first mounting hole. The height of the lower cylinder of the fixed ring does not exceed the height of the first mounting hole on the above-mentioned steel back, so that the fixed ring can be tightly installed on the inner side surface of the first mounting hole on the steel back, and it is ensured that there is no protruding structure on the outer side surface of the steel back. Chamfering treatments are performed on both the upper cylinder and the lower cylinder of the fixed ring to facilitate the mutual cooperation and installation between the fixed ring and the first mounting hole.

[0101] In addition, the fixing ring is installed in the first mounting hole through the fixing ring hole. The fixing ring hole and the first mounting hole are used in cooperation with each other, that is, their shapes and sizes match each other. Since the fixing ring is the installation position of the brake pad, in order to prevent the fixing ring from falling off the first mounting hole on the steel back during the braking process of the brake pad, after the fixing ring is placed into the first mounting hole, the fixing ring and the steel back are welded to increase the bonding force between the fixing ring and the steel back.

[0102] In an alternative embodiment, the brake pad further includes a riveting head for riveting the material grabbing pin on the steel back. The riveting head and the material grabbing pin are installed on the steel back in a riveting manner in cooperation with each other. As Figure 14 and Figure 15 shown, the material grabbing pin includes a connecting portion 11 and a cap portion 12 provided on the connecting portion 11. The connecting portion 11 is installed in the second mounting hole from the inner side of the steel back in an interference fit manner. The end face of the cap portion 12 facing away from the connecting portion 11 is provided with a top groove 14, and at the same time, the end face of the connecting portion 11 facing away from the cap portion 12 is provided with a bottom groove 13 for cooperating with the riveting head.

[0103] Exemplarily, as Figure 14 and Figure 15 shown, the overall shape of the material grabbing pin can be designed as a combination of a frustum of a cone and a cylinder, that is, the structure of the material grabbing pin is an integral structure with a frustum of a cone shape at the upper part and a cylinder shape at the lower part. The material grabbing pin with such a structure can increase the shear force between the steel back and the material. The top groove 14 is provided at the top end of the upper frustum of the material grabbing pin, and the top groove 14 is a groove with a trapezoidal cross-sectional area to further increase the material grabbing ability of the material grabbing pin. The bottom groove 13 is provided at the bottom end of the lower cylinder of the material grabbing pin, and the shape of the bottom groove 13 matches the shape of the riveting head to facilitate the installation of the material grabbing pin into the second mounting hole in a riveting manner using the riveting head. A chamfer with a certain angle is provided at the bottom of the material grabbing pin hole for riveting after the material grabbing pin is placed to ensure that the material grabbing pin is firmly connected to the steel back, and the riveted material grabbing pin can effectively prevent the material grabbing pin from falling off during the braking process of the brake pad and causing the friction body of the brake pad to fall off.

[0104] As a possible implementation, as Figure 16 shown, the above-mentioned organic synthetic friction body 2 can be an integral organic friction body in a fan-shaped structure. Different from the powder metallurgy brake pad friction body which can be divided into multiple independent small friction bodies, the synthetic materials in this organic synthetic friction body are relatively loose and it is not easy to form small friction bodies by pressing. Therefore, this organic synthetic friction body can be designed as a whole. The organic synthetic friction body with an integral structure is convenient for one-time molding during the preparation process, with simple process and convenient operation. Usually, the width of this organic synthetic friction body does not exceed the radius of the brake disc of the vehicle.

[0105] At least one chip discharge groove may be formed in the above-mentioned organic synthetic friction body. The chip discharge groove is a groove body with a narrow top and a wide bottom, and the chip discharge groove has an arc-shaped bottom. It should be noted that the outer side of the organic synthetic friction body is defined as the top, and the inner side of the organic synthetic friction body is defined as the bottom. The chip discharge groove mainly has two functions. One is to discharge the waste chips of the friction material during the braking process, and the other is to serve as a heat dissipation gap to better dissipate the excess heat during the braking process. Since the brake pad is in close contact with the wheel during the braking process, the friction material of the friction body will fall off as the brake disc rotates during the braking process. If the friction body does not have a chip discharge groove designed, it may cause problems such as changes in the braking distance of the locomotive, wheel damage, metal inlay of the brake pad, and an increase in the heat conduction coefficient.

[0106] As Figures 16 - 18 shown, two chip discharge grooves 8 are formed in the organic synthetic friction body 2. These two chip discharge grooves 8 are symmetrically distributed on both sides of the vertical center line of the organic synthetic friction body 2. The trend of each chip discharge groove 8 is a strip trend. The length of the chip discharge groove 8 is consistent with the width of the organic synthetic friction body 2. The cross-sectional area of the chip discharge groove 8 is trapezoidal, and the bottom is in an inverted semicircle shape. The chip discharge groove 8 with a narrow top and a wide bottom has a larger contact area with the air compared with a rectangular chip discharge groove with the same width, so it is beneficial to the discharge of waste chips and the dissipation of heat.

[0107] In a feasible way, the materials of the above-mentioned steel back, fixing ring, and gripping pin can all be carbon steel. As an iron-carbon alloy with a carbon content of 0.0218% - 2.11%, carbon steel has the advantages of high hardness, high strength, and wear resistance.

[0108] Embodiment 4

[0109] The present invention also provides a preparation method for a brake pad. As shown in the figure, the preparation method for the brake pad includes:

[0110] Step 10, fixing a plurality of fixing rings on the steel back. Fixing a plurality of gripping pins on the steel back. It should be understood that the gripping pins and fixing rings can be installed on the steel back simultaneously or at different times. It should be understood that the steel back, a plurality of fixing rings, and a plurality of gripping pins can be made in advance by a casting process. Of course, the preparation method for the brake pad provided in the embodiments of the present invention can also include this casting process, but it is necessary to ensure that the casting work is completed before step 10. It should be noted that after fixing a plurality of fixing rings and a plurality of gripping pins on the steel back, a steel back assembly is obtained.

[0111] As a possible implementation method, when a plurality of first mounting holes and a plurality of second mounting holes are formed in the steel back, fixing a plurality of fixing rings on the steel back includes:

[0112] Weld each fixing ring in the corresponding first mounting hole, and the second annular portion of the fixing ring is installed in the corresponding first mounting hole in an interference fit manner. It should be understood that a plurality of first mounting holes, a plurality of second mounting holes, and guiding holes for connecting with the brake can be formed on the steel back in advance. Of course, the opening of the first mounting hole, the second mounting hole, and the guiding hole can also be completed before step 10 included in the preparation method of the brake pad.

[0113] For example, as Figure 4 shown, a guiding hole 7 is formed at the lug position directly above the vertical center line position of the steel back 1. A plurality of first mounting holes 5 are formed at the lugs on both sides of the guiding hole 7 on the steel back 1. Second mounting holes 6 are formed at the fan-shaped structure of the steel back 1. Weld each fixing ring 3 in the corresponding first mounting hole 5, and the welding method can increase the bonding force between the fixing ring 3 and the steel back 1. Specifically, the bottom cylindrical part of the fixing ring 3 is installed in the corresponding first mounting hole 5 in an interference fit manner.

[0114] Rivet each material grabbing pin in the corresponding second mounting hole, and the connecting part of the material grabbing pin is installed in the corresponding second mounting hole in an interference fit manner.

[0115] Exemplarily, place each material grabbing pin into the corresponding second mounting hole, and then use a riveting head to install the material grabbing pin into the corresponding second mounting hole in a riveting manner. Specifically, the cylindrical part of the material grabbing pin is installed in the corresponding second mounting hole in an interference fit manner.

[0116] Step 20: Press the steel back and the organic synthetic friction body together to obtain a brake pad. It should be noted that the organic synthetic friction body is the organic synthetic friction body described in Embodiment 1 of the present invention. The preparation method of the organic synthetic friction body is also the preparation method provided in Embodiment 2 of the present invention.

[0117] Exemplarily, prepare the above-mentioned organic synthetic friction body by using the preparation method of the organic synthetic friction body described in Embodiment 2. Place the steel back assembly in step 10 into the die cavity of a hydraulic press, and then place the organic synthetic friction body into the die cavity of the hydraulic press. Press the steel back assembly and the organic synthetic friction body together by means of cold pressing to obtain a brake pad. The pressing pressure is 5000N / cm 2 ~8000N / cm 2 , and the pressing time is 20s~180s. To ensure the stability of the brake pad, before obtaining the brake pad, the preparation method of the above-mentioned brake pad further includes:

[0118] Cure the brake pad at 50°C to 220°C for 12h to 24h. For example, put the product after pressing into a curing furnace, heat the curing furnace to 50°C to 220°C, and after curing for 12h to 24h, deburr, groove, and paint the product to obtain the final brake pad.

[0119] The beneficial effects of the preparation method of the brake pad provided by the embodiment of the present invention are the same as those of the brake pad provided by the third embodiment above, and will not be elaborated here.

[0120] As a possible implementation, before obtaining the brake pad by pressing the steel back and the organic synthetic friction body together, the preparation method of the brake pad further includes:

[0121] Step 15: Form a plating layer with a thickness of 8μm to 15μm on the surface of the steel back. For example, after the above-mentioned steel back, fixing ring, and material grabbing pin are cast and formed, use a CNC lathe to further process the workpiece, and then use an electroplating process or a deposition process to form a plating layer with a thickness of 8μm to 15μm on the outer side of the steel back to protect the brake pad.

[0122] Embodiment Five

[0123] The embodiment of the present invention provides a preparation method of a brake pad based on an organic synthetic friction body. The organic synthetic friction body includes, by mass fraction: the mass fraction of liquid latex is 9%, the mass fraction of nitrile rubber powder is 6%, the mass fraction of organosilicon-modified phenolic resin is 8%, the mass fraction of alumina is 2.5%, the mass fraction of molybdenum disulfide is 8%, the mass fraction of calcium carbonate is 10%, the mass fraction of barium sulfate is 6%, the mass fraction of purple copper fiber is 10%, the mass fraction of steel fiber is 15%, the mass fraction of mineral fiber is 4%, the mass fraction of carbon fiber is 1%, the mass fraction of glass microspheres is 1%, the mass fraction of cast iron powder is 4%, the mass fraction of copper powder is 2%, the mass fraction of tin powder is 8%, the mass fraction of magnetite is 4.5%, and the mass fraction of rubber accelerator is 1%.

[0124] The preparation method of the brake pad provided by the embodiment of the present invention includes the following steps:

[0125] First step, premix the nitrile rubber powder and the organosilicon-modified phenolic resin in a V-type mixer for 0.5h to obtain a first premix.

[0126] Second step, put the alumina, molybdenum disulfide, calcium carbonate, barium sulfate, purple copper fiber, steel fiber, mineral fiber, and carbon fiber into a vertical mixer and premix for 1h to obtain a second premix.

[0127] Step 3: Put glass beads, cast iron powder, copper powder, tin powder, magnetite and rubber accelerator into a vertical two-way mixer for premixing for 1 h to obtain a third premix. The rubber accelerator can be zinc dimethyldithiocarbamate (accelerator PZ).

[0128] Step 4: Inject liquid latex into an automatic liquid filling device.

[0129] Step 5: Turn on the automatic liquid filling device, and mix the first premix obtained in Step 1 and the liquid latex for 5 min to obtain a first mixture.

[0130] Step 6: Put the second premix obtained in Step 2 into a horizontal ribbon mixer for mixing for 8 min to obtain a second mixture.

[0131] Step 7: Put the third premix obtained in Step 3 into a horizontal ribbon mixer for mixing for 10 min to obtain a third mixture.

[0132] Step 8: Knead the first mixture obtained in Step 5, the second mixture obtained in Step 6 and the third mixture obtained in Step 7 in a kneader at 20°C for 3 min to obtain a kneaded product.

[0133] Step 9: Put the above kneaded product into a crusher, and process it into particles of 3 mm or less than 9 mm using a sieve of 3 mm - 9 mm to obtain the organic synthetic friction body.

[0134] Step 10: Form a plating layer with a thickness of 8 μm on the surface of the steel back.

[0135] Step 11: Place the steel back and the organic synthetic friction body obtained in Step 9 into the cavity of a hydraulic press mold, and press the steel back and the organic synthetic friction body under a pressure of 5000 N / cm 2 for 180 s to obtain a brake pad.

[0136] Step 12: Cure the above brake pad at 50°C for 24 h, and perform deburring, grooving and painting treatments to obtain the final finished brake pad.

[0137] Example 6

[0138] An embodiment of the present invention provides a method for preparing a brake pad based on an organic synthetic friction body. The organic synthetic friction body, by mass fraction, includes: the mass fraction of liquid latex is 8%, the mass fraction of nitrile rubber powder is 7%, the mass fraction of organosilicon-modified phenolic resin is 9%, the mass fraction of alumina is 2.5%, the mass fraction of molybdenum disulfide is 8%, the mass fraction of calcium carbonate is 10%, the mass fraction of barium sulfate is 6%, the mass fraction of purple copper fiber is 8%, the mass fraction of steel fiber is 15%, the mass fraction of mineral fiber is 4%, the mass fraction of carbon fiber is 1%, the mass fraction of glass beads is 1%, the mass fraction of cast iron powder is 4%, the mass fraction of copper powder is 2%, the mass fraction of tin powder is 8%, the mass fraction of magnetite is 5.5% and the mass fraction of rubber accelerator is 1%.

[0139] The method for preparing the brake pad provided by the embodiment of the present invention includes the following steps:

[0140] First step, premix nitrile rubber powder and organosilicon-modified phenolic resin in a V-type mixer for 1.5 h to obtain a first premix.

[0141] Second step, put alumina, molybdenum disulfide, calcium carbonate, barium sulfate, purple copper fiber, steel fiber, mineral fiber and carbon fiber into a vertical mixer and premix for 2 h to obtain a second premix.

[0142] Third step, put glass beads, cast iron powder, copper powder, tin powder, magnetite and rubber accelerator into a vertical two-way mixer and premix for 1.5 h to obtain a third premix. The rubber accelerator can be zinc dimethyldithiocarbamate (accelerator PZ).

[0143] Fourth step, inject liquid latex into an automatic liquid filling device.

[0144] Fifth step, start the automatic liquid filling device, mix the first premix obtained in the first step and the liquid latex for 2 min to obtain a first mixture.

[0145] Sixth step, put the second premix obtained in the second step into a horizontal ribbon mixer and mix for 3 min to obtain a second mixture.

[0146] Seventh step, put the third premix obtained in the third step into a horizontal ribbon mixer and mix for 4 min to obtain a third mixture.

[0147] Eighth step, mix the first mixture obtained in the fifth step, the second mixture obtained in the sixth step and the third mixture obtained in the seventh step in a kneader at 50 °C for 0.5 min to obtain a kneaded product.

[0148] Step 9: Put the above kneaded product into a crusher, and process it into particles smaller than 3 mm - 9 mm using a sieve with a size of 3 mm - 9 mm to obtain the organic synthetic friction body.

[0149] Step 10: Form a plating layer with a thickness of 15 μm on the surface of the steel backing.

[0150] Step 11: Place the steel backing and the organic synthetic friction body obtained in Step 9 into the cavity of a hydraulic press mold, and use the cold pressing method to press the steel backing and the organic synthetic friction body under a pressure of 8000 N / cm 2 for 20 s to obtain the brake pad.

[0151] Step 12: Cure the above brake pad at 220 °C for 12 h, and perform deburring, grooving and painting treatments to obtain the final finished brake pad.

[0152] Example 7

[0153] The embodiment of the present invention provides a preparation method of a brake pad based on an organic synthetic friction body. The organic synthetic friction body, by mass fraction, includes: the mass fraction of liquid latex is 5%, the mass fraction of nitrile rubber powder is 4%, the mass fraction of organosilicon-modified phenolic resin is 10%, the mass fraction of alumina is 0.5%, the mass fraction of molybdenum disulfide is 6%, the mass fraction of calcium carbonate is 6%, the mass fraction of barium sulfate is 8%, the mass fraction of purple copper fiber is 12%, the mass fraction of steel fiber is 18%, the mass fraction of mineral fiber is 6%, the mass fraction of carbon fiber is 0.5%, the mass fraction of glass microbeads is 0.5%, the mass fraction of cast iron powder is 3%, the mass fraction of copper powder is 3%, the mass fraction of tin powder is 10%, the mass fraction of magnetite is 6% and the mass fraction of rubber accelerator is 1.5%.

[0154] The preparation method of the brake pad provided by the embodiment of the present invention includes the following steps:

[0155] Step 1: Premix the nitrile rubber powder and the organosilicon-modified phenolic resin in a V-type mixer for 1 h to obtain a first premix.

[0156] Step 2: Put the alumina, molybdenum disulfide, calcium carbonate, barium sulfate, purple copper fiber, steel fiber, mineral fiber and carbon fiber into a vertical mixer and premix for 1.5 h to obtain a second premix.

[0157] Step 3: Put the glass microbeads, cast iron powder, copper powder, tin powder, magnetite and rubber accelerator into a vertical two-way mixer and premix for 1.2 h to obtain a third premix. The rubber accelerator can be zinc dimethyldithiocarbamate (accelerator PZ).

[0158] Step 4: Inject the liquid latex into an automatic liquid filling device.

[0159] In the fifth step, turn on the automatic liquid filling equipment and mix the first premix obtained in the first step and the liquid latex for 3 minutes to obtain a first mixture.

[0160] In the sixth step, put the second premix obtained in the second step into a horizontal screw ribbon mixer and mix for 4 minutes to obtain a second mixture.

[0161] In the seventh step, put the third premix obtained in the third step into a horizontal screw ribbon mixer and mix for 5 minutes to obtain a third mixture.

[0162] In the eighth step, mix the first mixture obtained in the fifth step, the second mixture obtained in the sixth step, and the third mixture obtained in the seventh step in a kneader at 30 °C for 2 minutes to obtain a kneaded product.

[0163] In the ninth step, put the above kneaded product into a crusher and process it into particles smaller than 3 mm to 9 mm using a sieve with a size of 3 mm to 9 mm to obtain the organic synthetic friction body.

[0164] In the tenth step, form a plating layer with a thickness of 10 μm on the surface of the steel back.

[0165] In the eleventh step, place the steel back and the organic synthetic friction body obtained in the ninth step into the die cavity of a hydraulic press, and use cold pressing to press the steel back and the organic synthetic friction body under a pressure of 7000 N / cm 2 for 50 s to obtain a brake pad.

[0166] In the twelfth step, cure the above brake pad at 100 °C for 18 h, and perform deburring, grooving, and painting treatments to obtain the final finished brake pad.

[0167] Example VIII

[0168] The present invention provides a method for preparing a brake pad based on an organic synthetic friction body. The raw materials of the organic synthetic friction body, by mass fraction, include: the mass fraction of liquid latex is 10%, the mass fraction of nitrile rubber powder is 8%, the mass fraction of organosilicon-modified phenolic resin is 9.5%, the mass fraction of alumina is 4%, the mass fraction of molybdenum disulfide is 10%, the mass fraction of calcium carbonate is 9.5%, the mass fraction of barium sulfate is 4%, the mass fraction of purple copper fiber is 7.5%, the mass fraction of steel fiber is 13%, the mass fraction of mineral fiber is 2%, the mass fraction of carbon fiber is 2%, the mass fraction of glass microspheres is 2%, the mass fraction of cast iron powder is 6%, the mass fraction of copper powder is 1%, the mass fraction of tin powder is 9%, the mass fraction of magnetite is 2%, and the mass fraction of rubber accelerator is 0.5%.

[0169] The method for preparing the brake pad provided by the embodiment of the present invention includes the following steps:

[0170] First step: Premix nitrile rubber powder and organosilicon-modified phenolic resin in a V-type mixer for 0.8 h to obtain a first premix.

[0171] Second step: Put alumina, molybdenum disulfide, calcium carbonate, barium sulfate, copper fiber, steel fiber, mineral fiber and carbon fiber into a vertical mixer and premix for 1.2 h to obtain a second premix.

[0172] Third step: Put glass beads, cast iron powder, copper powder, tin powder, magnetite and rubber accelerator into a vertical two-way mixer and premix for 1.2 h to obtain a third premix. The rubber accelerator can be zinc dimethyldithiocarbamate (accelerator PZ).

[0173] Fourth step: Inject liquid latex into an automatic liquid filling device.

[0174] Fifth step: Turn on the automatic liquid filling device, and mix the first premix obtained in the first step and the liquid latex for 4 min to obtain a first mixture.

[0175] Sixth step: Put the second premix obtained in the second step into a horizontal ribbon mixer and mix for 7 min to obtain a second mixture.

[0176] Seventh step: Put the third premix obtained in the third step into a horizontal ribbon mixer and mix for 8 min to obtain a third mixture.

[0177] Eighth step: Knead the first mixture obtained in the fifth step, the second mixture obtained in the sixth step and the third mixture obtained in the seventh step in a kneader at 40 °C for 2 min to obtain a kneaded product.

[0178] Ninth step: Put the above kneaded product into a crusher and process it into particles below 3 mm - 9 mm using a sieve with a size of 3 mm - 9 mm to obtain the organic synthetic friction body.

[0179] Tenth step: Form a plating layer with a thickness of 11 μm on the surface of the steel back.

[0180] Eleventh step: Place the steel back and the organic synthetic friction body obtained in the ninth step into the die cavity of a hydraulic press, and use the cold pressing method to press the steel back and the organic synthetic friction body at a pressure of 6000 N / cm 2 for 90 s to obtain a brake pad.

[0181] Twelfth step: Cure the above brake pad at 120 °C for 15 h, and perform deburring, grooving and painting treatments to obtain the final brake pad product.

[0182] Example Nine

[0183] An embodiment of the present invention provides a method for preparing a brake pad based on an organic synthetic friction body. The raw materials of the organic synthetic friction body, by mass fraction, include: the mass fraction of liquid latex is 5%, the mass fraction of nitrile rubber powder is 4%, the mass fraction of organosilicon-modified phenolic resin is 8%, the mass fraction of alumina is 1.5%, the mass fraction of molybdenum disulfide is 7%, the mass fraction of calcium carbonate is 7%, the mass fraction of barium sulfate is 8%, the mass fraction of purple copper fiber is 11%, the mass fraction of steel fiber is 16%, the mass fraction of mineral fiber is 5%, the mass fraction of carbon fiber is 1.5%, the mass fraction of glass microspheres is 1.5%, the mass fraction of cast iron powder is 5%, the mass fraction of copper powder is 2%, the mass fraction of tin powder is 9%, the mass fraction of magnetite is 8%, and the mass fraction of rubber accelerator is 0.5%.

[0184] The method for preparing the brake pad provided by the embodiment of the present invention includes the following steps:

[0185] First step, premix the nitrile rubber powder and the organosilicon-modified phenolic resin in a V-type mixer for 0.9 h to obtain a first premix.

[0186] Second step, put the alumina, molybdenum disulfide, calcium carbonate, barium sulfate, purple copper fiber, steel fiber, mineral fiber and carbon fiber into a vertical mixer and premix for 1.3 h to obtain a second premix.

[0187] Third step, put the glass microspheres, cast iron powder, copper powder, tin powder, magnetite and rubber accelerator into a vertical double-direction mixer and premix for 1.2 h to obtain a third premix. The rubber accelerator can be zinc dimethyldithiocarbamate (accelerator PZ).

[0188] Fourth step, inject the liquid latex into an automatic liquid filling device.

[0189] Fifth step, turn on the automatic liquid filling device, and mix the first premix obtained in the first step and the liquid latex for 5 min to obtain a first mixture.

[0190] Sixth step, put the second premix obtained in the second step into a horizontal ribbon mixer and mix for 8 min to obtain a second mixture.

[0191] Seventh step, put the third premix obtained in the third step into a horizontal ribbon mixer and mix for 10 min to obtain a third mixture.

[0192] Eighth step, mix the first mixture obtained in the fifth step, the second mixture obtained in the sixth step and the third mixture obtained in the seventh step in a mixer at 50 °C for 1 min to obtain a kneaded product.

[0193] Step 9: Put the above kneaded product into a crusher and process it into particles below 3 mm to 9 mm using a sieve with a mesh size of 3 mm to 9 mm to obtain the organic synthetic friction body.

[0194] Step 10: Form a plating layer with a thickness of 9 μm on the surface of the steel back.

[0195] Step 11: Place the steel back and the organic synthetic friction body obtained in Step 9 into the die cavity of a hydraulic press and press the steel back and the organic synthetic friction body together in a cold pressing manner at a pressure of 6500 N / cm 2 for 80 s to obtain the brake pad.

[0196] Step 12: Cure the above brake pad at 150 °C for 13 h, and perform deburring, grooving and painting treatments to obtain the final finished brake pad.

[0197] Table 1 shows the results of mechanical and physical property tests and friction coefficient results of the brake pads prepared in Example 5 and Example 6 of the present invention and the powder metallurgy brake pads in the prior art.

[0198] Table 1 Performance table of the brake pads prepared in the examples of the present invention and the powder metallurgy brake pads

[0199]

[0200] It can be seen from Table 1 that for the brake pads prepared in the examples of the present invention, their mechanical and physical properties, friction coefficient, etc. all meet the relevant product standard requirements, and the thermal conductivity coefficient of the brake pads prepared in the examples of the present invention is about half lower than that of the existing powder metallurgy brake pads. At the same time, during the friction test of the brake pads prepared in the examples of the present invention, no phenomena such as edge chipping, corner chipping, abnormal wear and metal embedding occurred, indicating that the brake pads prepared in the examples of the present invention can completely replace the current powder metallurgy products, and the cost of the products of the present invention is more than half cheaper than the cost of the current powder metallurgy products.

[0201] In the description of the above embodiments, the specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0202] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. An organic synthetic friction body, characterized in that, the raw materials of the organic synthetic friction body, by mass fraction, include 5% - 10% liquid latex, 4% - 8% nitrile rubber powder, 8% - 10% organosilicon modified phenolic resin, 0.5% - 4% alumina, 6% - 10% molybdenum disulfide, 6% - 10% calcium carbonate, 4% - 8% barium sulfate, 7.5% - 12% copper fiber, 13% - 18% steel fiber, 2% - 6% mineral fiber, 0.5% - 2% carbon fiber, 0.5% - 2% glass microspheres, 3% - 6% cast iron powder, 1% - 3% copper powder, 8% - 10% tin powder, 2% - 8% magnetite and 0.5% - 1.5% rubber accelerator.

2. A preparation method of an organic synthetic friction body, characterized in that, applied to the organic synthetic friction body described in claim 1, the preparation method of the organic synthetic friction body includes: Mixing liquid latex, nitrile rubber powder, organosilicon modified phenolic resin, rubber accelerator, copper fiber, steel fiber, mineral fiber, carbon fiber, metal filler and inorganic filler evenly, and carrying out internal mixing to obtain an organic synthetic friction body.

3. According to the preparation method of the organic synthetic friction body described in claim 2, characterized in that, the mixing of liquid latex, nitrile rubber powder, organosilicon modified phenolic resin, rubber accelerator, copper fiber, steel fiber, mineral fiber, carbon fiber, metal filler and inorganic filler evenly and carrying out internal mixing includes: Mixing nitrile rubber powder, organosilicon modified phenolic resin and liquid latex evenly to obtain a first mixture; Mixing alumina, molybdenum disulfide, calcium carbonate, barium sulfate, copper fiber, steel fiber, mineral fiber and carbon fiber evenly to obtain a second mixture; Mixing glass microspheres, cast iron powder, copper powder, tin powder, magnetite and rubber accelerator evenly to obtain a third mixture; Carrying out internal mixing on the first mixture, the second mixture and the third mixture to obtain an internal mixing product.

4. According to the preparation method of the organic synthetic friction body described in claim 3, characterized in that, the mixing of nitrile rubber powder, organosilicon modified phenolic resin and liquid latex evenly to obtain a first mixture includes: Pre - mixing nitrile rubber powder and organosilicon modified phenolic resin for 0.5h - 1.5h to obtain a first pre - mixture; mixing the first pre - mixture and liquid latex for 2min - 5min to obtain a first mixture; and / or, the mixing of alumina, molybdenum disulfide, calcium carbonate, barium sulfate, copper fiber, steel fiber, mineral fiber and carbon fiber evenly to obtain a second mixture includes: Pre - mixing alumina, molybdenum disulfide, calcium carbonate, barium sulfate, copper fiber, steel fiber, mineral fiber and carbon fiber for 1h - 2h to obtain a second pre - mixture; mixing the second pre - mixture for 3min - 8min to obtain a second mixture; and / or, the mixing of glass microspheres, cast iron powder, copper powder, tin powder, magnetite and rubber accelerator evenly to obtain a third mixture includes: Premix glass microspheres, cast iron powder, copper powder, tin powder, magnetite and rubber accelerator for 1 h to 1.5 h to obtain a third premix; mix the third premix for 4 min to 10 min to obtain a third mixture; and / or The step of performing internal mixing on the first mixture, the second mixture and the third mixture to obtain an internally mixed product includes: Perform internal mixing on the first mixture, the second mixture and the third mixture at 20°C to 50°C for 0.5 min to 3 min to obtain an internally mixed product; and / or After obtaining the internally mixed product and before obtaining the organic synthetic friction body, the preparation method of the organic synthetic friction body further includes: Process the internally mixed product into particles with a size of 3 mm to 9 mm to obtain the organic synthetic friction body.

5. A brake pad characterized in that it includes a steel back, an organic synthetic friction body, a plurality of fixing rings and a plurality of gripping pins, the organic synthetic friction body is an integral organic synthetic friction body, and the organic synthetic friction body is the organic synthetic friction body described in claim 1; A plurality of the fixing rings and a plurality of the gripping pins are both fixed on the steel back, and the plurality of gripping pins fix the organic synthetic friction body on the steel back.

6. The brake pad according to claim 5 characterized in that The steel back is provided with a plurality of first mounting holes, a plurality of second mounting holes and a guiding hole for connecting with a brake; each of the fixing rings is installed in a corresponding one of the first mounting holes, and each of the gripping pins is installed in a corresponding one of the second mounting holes; the plurality of second mounting holes are radially arranged on the steel back; The fixing ring includes a first annular part and a second annular part connected into one body, and the outer diameter of the first annular part is larger than the outer diameter of the second annular part; the second annular part is installed in the first mounting hole by an interference fit; The brake pad further includes a riveting head for riveting the gripping pin on the steel back, and the gripping pin includes a connecting part and a cap part arranged on the connecting part; the connecting part is installed in the second mounting hole by an interference fit; a top groove is provided on the end face of the cap part facing away from the connecting part; a bottom groove for cooperating with the riveting head is provided on the end face of the connecting part facing away from the cap part.

7. The brake pad according to claim 5 or 6 characterized in that At least one chip removal groove is provided on the organic synthetic friction body; the chip removal groove is a groove body with a narrow top and a wide bottom, and the chip removal groove has an arc-shaped groove bottom; and / or The steel back is in a fan-shaped structure; and / or The organic synthetic friction body is an integral organic synthetic friction body in a fan-shaped structure, and the width of the organic synthetic friction body does not exceed the radius of the brake disc of the vehicle; and / or The materials of the steel back, the fixing ring and the gripping pin are all carbon steel.

8. A preparation method of a brake pad characterized in that Applied to the brake pad according to any one of claims 6 to 7, the preparation method of the brake pad includes: Fix a plurality of the fixing rings on the steel back; Fix a plurality of the gripping pins on the steel back; Press the steel back and the organic synthetic friction body described in claim 1 together to obtain a brake pad; a plurality of the stock pins fix the organic synthetic friction body on the steel back.

9. The method for preparing a brake pad according to claim 8, wherein, when the steel back is provided with a plurality of first mounting holes and a plurality of second mounting holes, the step of fixing a plurality of the fixing rings on the steel back includes: welding each of the fixing rings in the corresponding first mounting hole, and mounting the second annular portion in the corresponding first mounting hole in an interference fit manner; and / or, the step of fixing a plurality of the stock pins on the steel back includes: riveting each of the stock pins in the corresponding second mounting hole, and mounting the connecting portion in the second mounting hole in an interference fit manner; and / or, the step of pressing the steel back and the organic synthetic friction body described in claim 1 together to obtain a brake pad includes: The steel back and the organic synthetic friction body according to claim 1 are pressed together by a cold pressing method to obtain a brake pad; the pressure of the pressing is 5000 N / cm 2 ~8000 N / cm 2 , and the pressing time is 20 s to 180 s; and / or, after obtaining the brake pad, the method for preparing the brake pad further includes: curing the brake pad at 50°C to 220°C for 12h to 24h; and / or, before pressing the steel back and the organic synthetic friction body described in claim 1 together to obtain a brake pad, the method for preparing the brake pad further includes: forming a plating layer with a thickness of 8μm to 15μm on the surface of the steel back.

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