Composite ceramic-based drum brake pad and preparation method thereof

Abstract

The invention relates to a preparation method of a composite ceramic-based drum brake pad, which sequentially comprises the following steps: step 1, an extrusion process: carrying out extrusion molding on cashew nut shell oil modified phenolic resin through an extruder to obtain a single resin material sheet, and then conveying the single resin material sheet on a conveying belt; a second motor drives a quantitative barrel to rotate, the raw materials in the material barrel fall into an auger through a through opening, meanwhile, a first motor drives the auger to rotate, the raw materials are mixed, and a mixture is obtained; step 3, a material scattering process: a second motor drives an opening and closing plate to rotate, so that the mixed material is scattered onto the resin material sheet from a material scattering hole; a first motor drives a cam to rotate, a material scattering roller moves in a reciprocating mode during material scattering, the raw materials are evenly scattered to the resin material pieces, then the resin material pieces are pressed through a pressing roller, and friction material pieces are obtained; and 5, a pressing process is conducted, specifically, the multiple friction material pieces and the back plate are placed in a hot-pressing device to be subjected to hot-pressing forming.

Description

Technical Field

[0001] This invention relates to the field of automotive parts manufacturing, and more specifically to a composite ceramic-based drum brake pad and its preparation method. Background Technology

[0002] Brake pads are mainly composed of friction materials and a backing plate. The friction materials mainly include binders, friction modifiers, fillers, and fibers. The raw materials of the friction materials need to be mixed and then pressed together with the backing plate in a press. Chinese patent CN105295838B discloses a friction material for drum brake pads and a method for preparing drum brake pads, including 10%–15% phenolic resin, 6%–12% glass fiber, 10%–15% petroleum coke, 10%–20% mineral fiber, 10%–50% barium sulfate, 3%–8% alumina, 5%–10% artificial graphite, 5%–10% friction powder, and 3%–5% nitrile rubber powder by weight. The above material ratio is used to produce finished drum brake pads through raw material mixing, hot pressing, heat treatment, grinding and drilling, and printing and packaging. This invention addresses the shortcomings of existing technologies by improving the composition of brake pad friction materials. This increases the porosity of the brake pads while simultaneously reducing their hardness, thereby extending their service life.

[0003] However, the inventors discovered that the raw materials for friction materials are usually mixed using a mixing drum, which results in uneven or incomplete mixing, leading to low brake pad performance. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a composite ceramic-based drum brake pad, comprising a backing plate and a friction pad. The friction pad comprises the following components by weight percentage: 8%-15% cashew nutshell oil modified phenolic resin, 5%-30% ceramic fiber, 5%-10% graphite, 10%-20% steel fiber, 3%-10% alumina, 10%-20% barium sulfate, 5%-10% copper powder, and 3%-8% molybdenum disulfide.

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a method for preparing composite ceramic-based drum brake pads. The method involves hot-melting and extruding resin into resin sheets, which are then transported. After thorough mixing of the raw materials, the mixture is sprinkled onto the resin sheets and pressed. This process is repeated several times to obtain friction pads. Multiple friction pads and a backing plate are then fed into a pressing machine for molding, resulting in more uniform mixing of the friction materials and significantly improved brake pad performance.

[0006] The technical solution of the present invention is as follows: A composite ceramic-based drum brake pad includes a backing plate and a friction pad, wherein the friction pad comprises the following components by weight percentage: 8%-15% cashew nutshell oil modified phenolic resin, 5%-30% ceramic fiber, 5%-10% graphite, 10%-20% steel fiber, 3%-10% alumina, 10%-20% barium sulfate, 5%-10% copper powder, and 3%-8% molybdenum disulfide.

[0007] A method for preparing a composite ceramic-based drum brake pad includes the following steps: Step 1, Extrusion process: The cashew nut shell oil modified phenolic resin is extruded into individual resin flakes through an extruder and then transported on a conveyor belt. Step 2, Mixing process: The second motor drives the metering cylinder to rotate, causing the raw materials in the cylinder to fall into the auger through the opening. At the same time, the first motor drives the auger to rotate, mixing the raw materials to obtain a mixture. Step 3, Spreading process: The second motor drives the opening and closing plate to rotate, so that the mixture is spread from the spreading hole onto the resin sheet; Step 4, Shaking process: The first motor drives the cam to rotate, causing the spreading roller to move back and forth during spreading. The raw material is evenly spread onto the resin sheet, and then the pressure roller presses the resin sheet to obtain the friction sheet. Step 5, Pressing process: Place multiple friction pads and back plate in a hot press device for hot pressing molding.

[0008] As a preferred embodiment, in step two, while the resin sheet is being formed and conveyed, the second motor drives the metering cylinder to rotate, and the inlet is connected to the discharge pipe, so that the raw material in the cylinder falls into the metering cylinder.

[0009] As a preferred embodiment, in step two, after the raw material falls into the auger through the metering cylinder, the first motor drives the auger to rotate, mixes the raw material, and then conveys it to the spreading roller.

[0010] As a preferred embodiment, in step three, when the second motor drives the metering cylinder to connect with the feeding pipe, the second motor drives the opening and closing plate to rotate, and the raw material is sprinkled onto the resin sheet through the sprinkling hole.

[0011] As a preferred embodiment, in step four, the first motor drives the cam to rotate, the cam drives the extension shaft to reciprocate, and the spreading roller performs small-amplitude reciprocating swaying during spreading, so that the raw material is evenly spread onto the surface of the resin flakes.

[0012] As a preferred embodiment, in step four, after the raw material is sprinkled onto the resin sheet, it is pressed together by the pressure roller to obtain a friction sheet. During the continued transmission of the friction sheet, the sprinkling process is repeated several times to ensure that the raw material in the friction sheet meets the standard.

[0013] As a preferred embodiment, in step five, several friction pads are stacked after forming and then pressed together with the back plate in a press machine.

[0014] Another objective of this invention is to address the shortcomings of existing technologies by providing a composite ceramic-based drum brake pad preparation apparatus that matches a method for preparing composite ceramic-based drum brake pads. The apparatus includes an extruder and a conveyor belt disposed on one side of the extruder. A support frame and several material cylinders are placed on the support frame on one side of the conveyor belt. A metering component is disposed between the material cylinders. A mixing component is disposed on the metering component. A drive component and an opening / closing component driven by the drive component are disposed on the conveyor belt. The opening / closing component is provided with a material spreading roller with spreading holes. A top extension component is provided on the conveyor belt to drive the material spreading roller to reciprocate. The mixing component is used by the metering component to quantitatively feed different raw materials from the material cylinders into it for mixing. The opening / closing component is used to switch the opening / closing state of the spreading holes.

[0015] As a preferred embodiment, the metering component includes a base, a fixing plate fixedly mounted on the base, a metering cylinder rotatably mounted on the fixing plate, a plurality of openings on the metering cylinder, and a feeding pipe fixedly mounted on the cylinder, wherein the feeding pipe slides in conjunction with the top surface of the metering cylinder and engages with the openings.

[0016] As a preferred embodiment, the mixing assembly includes a first motor fixedly mounted on a base, a conveying cylinder fixedly mounted on the base, an auger rotatably mounted inside the conveying cylinder, a fixed pipe fixedly mounted on the conveying cylinder, a telescopic pipe fixedly mounted on the conveying cylinder, and a connecting pipe fixedly mounted between the dispensing roller and the telescopic pipe. The metering cylinder and the fixed pipe are rotatably coupled, and the output shaft of the first motor is fixedly connected to the auger.

[0017] As a preferred embodiment, the drive assembly includes a base plate, a second motor fixedly mounted on the base plate, a rotating shaft fixedly mounted on the output shaft of the second motor, a first bevel gear fixedly mounted on the rotating shaft, a rotating shaft rotatably mounted on the base plate, and a second bevel gear fixedly mounted on the rotating shaft. The first bevel gear and the second bevel gear mesh with each other, and the rotating shaft is connected to the metering cylinder via a drive.

[0018] As a preferred embodiment, the opening and closing assembly includes a rotating cylinder rotatably mounted on a base plate, a fixed cylinder fixedly mounted on the base plate, and an opening and closing plate rotatably mounted on a spreading roller. The rotating shaft is fixedly connected to the rotating cylinder, the spreading roller is slidably connected to the rotating cylinder and the fixed cylinder, and the opening and closing plate is fixedly connected to the rotating cylinder and cooperates with the spreading hole.

[0019] As a preferred embodiment, the top extension assembly includes a cam rotatably mounted on a base, a third bevel gear fixedly mounted on a camshaft, a connecting shaft rotatably mounted on the base, a fourth bevel gear fixedly mounted on the connecting shaft, and an extension shaft slidably mounted on the base. The third bevel gear and the fourth bevel gear mesh with each other. The extension shaft passes through a fixed cylinder and is fixedly connected to the spreading roller. The connecting shaft is drively connected to the output shaft of a first motor.

[0020] As a preferred embodiment, a pressure roller is rotatably mounted on the base plate.

[0021] The beneficial effects of this invention are as follows: 1. The present invention is equipped with a quantitative component and a mixing component. By placing the raw materials in different material cylinders, the raw materials are quantitatively fed and spread, so that the raw materials in each resin sheet are uniform and the raw materials in the friction material are more uniform.

[0022] 2. This invention also includes an opening and closing assembly and a top extension assembly, which ensure that the raw material is quantitatively dispensed and evenly distributed onto the resin sheet during the spreading process, while preventing the spreading roller from clogging. The friction sheet undergoes multiple spreading and pressing processes before being pressed against the back plate, greatly improving the performance of the friction material. In summary, this invention has the advantages of more uniform material spreading and better friction effect, making it suitable for the automotive parts manufacturing industry. Attached Figure Description

[0023] The invention will be further described below with reference to the accompanying drawings: Figure 1 This is a flowchart of the preparation method; Figure 2 An apparatus for preparing composite ceramic-based drum brake pads; Figure 3 This is a schematic diagram of the structure of the hybrid component and the driving component; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the opening and closing components; Figure 6 This is a schematic diagram of the material spreading roller. Figure 7 This is a schematic diagram of the opening structure; Figure 8 A schematic diagram showing the state of feeding material when the opening and closing plate rotates while the metering cylinder rotates; Figure 9 for Figure 8 Enlarged view at point B in the middle; Figure 10 for Figure 8 Enlarged view at point C; Figure 11 for Figure 8 Enlarged view at point D; Figure 12 A schematic diagram showing the state of the material spreading process when the spreading roller moves back and forth. Figure 13 for Figure 12 Enlarged view at point E in the middle; Figure 14 for Figure 12 Enlarged view at point F; Reference numerals: 1 Extruder, 2 Conveyor belt, 3 Support frame, 31 Material cylinder, 32 Base plate, 4 Metering component, 41 Base, 42 Fixing plate, 43 Metering cylinder, 44 Through port, 45 Feeding pipe, 5 Mixing component, 51 First motor, 52 Conveying cylinder, 53 Screwdriver, 54 Fixing pipe, 55 Telescopic pipe, 56 Connecting pipe, 6 Drive component, 61 Second motor, 62 Rotating shaft, 63 First bevel gear, 64 Rotating shaft, 65 Second bevel gear, 7 Opening and closing component, 71 Rotating cylinder, 72 Fixing cylinder, 73 Opening and closing plate, 8 Spreading roller, 9 Spreading hole, 10 Top extension component, 101 Cam, 102 Third bevel gear, 103 Connecting shaft, 104 Fourth bevel gear, 105 Extension shaft, 11 Pressure roller. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Example 1

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] A composite ceramic-based drum brake pad includes a backing plate and a friction material, the friction material comprising the following components by weight percentage: 8%-15% cashew nutshell oil modified phenolic resin, 5%-30% ceramic fiber, 5%-10% graphite, 10%-20% steel fiber, 3%-10% alumina, 10%-20% barium sulfate, 5%-10% copper powder, and 3%-8% molybdenum disulfide.

[0027] like Figure 1 As shown, a method for preparing a composite ceramic-based drum brake pad includes the following steps: Step 1, Extrusion process: Cashew shell oil modified phenolic resin is extruded through extruder 1 to form individual resin sheets, which are then transported on conveyor belt 2. Step 2, Mixing process: The second motor 61 drives the metering cylinder 43 to rotate, so that the raw materials in the cylinder 31 fall into the auger 53 through the outlet 44. At the same time, the first motor 51 drives the auger 53 to rotate, mixing the raw materials to obtain a mixture. Step 3, Spreading process: The second motor 61 drives the opening and closing plate 73 to rotate, so that the mixture is spread from the spreading hole 9 onto the resin sheet; Step 4, Shaking process: The first motor 51 drives the cam 101 to rotate, so that the spreading roller 8 moves back and forth when spreading the material. After the raw material is evenly spread onto the resin sheet, the pressure roller 11 presses the resin sheet to obtain the friction sheet. Step 5, Pressing process: Place multiple friction pads and back plate in a hot press device for hot pressing molding.

[0028] It is worth mentioning that, such as Figures 1 to 10 As shown, in step two, while the resin sheet is being formed and conveyed, the second motor 61 drives the metering cylinder 43 to rotate, and the outlet 44 is connected to the discharge pipe 45, so that the raw material in the material cylinder 31 falls into the metering cylinder 43.

[0029] In addition, such as Figures 8 to 10 As shown, in step two, after the raw material falls into the auger 53 through the metering cylinder 43, the first motor 51 drives the auger 53 to rotate, mixes the raw material and conveys it to the spreading roller 8.

[0030] It should be further explained that, such as Figure 11 As shown, in step three, when the second motor 61 drives the metering cylinder 43 to connect with the feeding pipe 45, the second motor 61 drives the opening and closing plate 73 to rotate, and the raw material is sprinkled onto the resin sheet through the sprinkling hole 9.

[0031] It needs to be emphasized that, such as Figure 12 and Figure 13 As shown, in step four, the first motor 51 drives the cam 101 to rotate, and the cam 101 drives the extension shaft 105 to move back and forth. The spreading roller 8 makes a small-amplitude back and forth swaying motion when spreading the material, so that the raw material is evenly spread onto the surface of the resin sheet.

[0032] Furthermore, such as Figure 14 As shown, in step four, after the raw material is sprinkled onto the resin sheet, it is pressed by the pressure roller 11 to obtain a friction sheet. During the continued transmission of the friction sheet, the sprinkling process is repeated several times to ensure that the raw material in the friction sheet meets the standard.

[0033] It is worth mentioning that, such as Figure 1 As shown, in step five, several friction pads are stacked after being formed, and then placed in a press with the back plate for pressing and forming. Example 2

[0034] like Figures 2 to 14 As shown, a device for preparing a composite ceramic-based drum brake pad includes an extruder 1 and a conveyor belt 2 disposed on one side of the extruder 1. A support frame 3 is disposed on one side of the conveyor belt 2, and several material cylinders 31 are placed on the support frame 3. A metering component 4 is disposed between the several material cylinders 31. A mixing component 5 is disposed on the metering component 4. A driving component 6 and an opening and closing component 7 driven by the driving component 6 are disposed on the conveyor belt 2. A spreading roller 8 for spreading material is disposed on the opening and closing component 7, and the spreading roller 8 has spreading holes 9. A top extension component 10 is disposed on the conveyor belt 2 for driving the spreading roller 8 to reciprocate. The mixing component 5 is used to mix the different raw materials in the several material cylinders 31 after the metering component 4 quantitatively feeds them into the mixing component 5. The opening and closing component 7 is used to switch the opening and closing state of the spreading holes 9. The raw materials are divided into several types and placed in the material cylinders 31 respectively.

[0035] It is worth mentioning that, such as Figures 8 to 10 As shown, the metering component 4 includes a base 41, a fixing plate 42 fixedly mounted on the base 41, a metering cylinder 43 rotatably mounted on the fixing plate 42, several openings 44 on the metering cylinder 43, and a feeding pipe 45 fixedly mounted on the material cylinder 31. The feeding pipe 45 slides with the top surface of the metering cylinder 43 and engages with the openings 44. Initially, the metering cylinder 43 is not connected to the feeding pipe 45. During use, after the resin is hot-melted and extruded by the extruder 1, it is transported on the conveyor belt 2. Then, the second motor 61 drives the metering cylinder 43 to rotate, connecting the openings 44 with the feeding pipe 45. The raw material in the material cylinder 31 falls into the metering cylinder 43. After the feeding is completed, the second motor 61 drives the metering cylinder 43 to rotate, causing the openings 44 and the feeding pipe 45 to be misaligned, and the raw material stops falling, achieving the effect of metered feeding.

[0036] In addition, such as Figures 8 to 11 As shown, the mixing component 5 includes a first motor 51 fixedly mounted on the base 41, a conveying cylinder 52 fixedly mounted on the base 41, an auger 53 rotatably mounted inside the conveying cylinder 52, a fixed pipe 54 fixedly mounted on the conveying cylinder 52, a telescopic pipe 55 fixedly mounted on the conveying cylinder 52, and a connecting pipe 56 fixedly mounted between the spreading roller 8 and the telescopic pipe 55. The metering cylinder 43 and the fixed pipe 54 are rotatably coupled. The output shaft of the first motor 51 is fixedly connected to the auger 53. The conveying cylinder 52 is filled with raw materials. In use, when the raw materials fall into the conveying cylinder 52 through the metering cylinder 43, the first motor 51 drives the auger 53 to rotate, transferring the mixed raw materials at the output end of the conveying cylinder 52 to the spreading roller 8, and mixing and transferring the raw materials falling from the metering cylinder 43, so that the conveying cylinder 52 is always filled with raw materials, achieving the effect of metered spreading.

[0037] It should be further explained that, such as Figure 3As shown, the drive assembly 6 includes a base plate 32, a second motor 61 fixedly mounted on the base plate 32, a rotating shaft 62 fixedly mounted on the output shaft of the second motor 61, a first bevel gear 63 fixedly mounted on the rotating shaft 62, a rotating shaft 64 rotatably mounted on the base plate 32, and a second bevel gear 65 fixedly mounted on the rotating shaft 64. The first bevel gear 63 and the second bevel gear 65 mesh with each other, and the rotating shaft 64 is connected to the metering cylinder 43 in a transmission connection.

[0038] It needs to be emphasized that, such as Figure 11 As shown, the opening and closing assembly 7 includes a rotating cylinder 71 rotatably mounted on the base plate 32, a fixed cylinder 72 fixedly mounted on the base plate 32, and an opening and closing plate 73 rotatably mounted on the spreading roller 8. The rotating shaft 62 is fixedly connected to the rotating cylinder 71, and the spreading roller 8 is slidably connected to the rotating cylinder 71 and the fixed cylinder 72. The opening and closing plate 73 is fixedly connected to the rotating cylinder 71 and cooperates with the spreading hole 9. The spreading roller 8 is filled with raw material. In its initial state, the opening and closing plate 73 blocks the spreading hole 9, so that the raw material is quantitatively spread. In use, when spreading is required, the second motor 61 drives the quantitative cylinder 43 to rotate to feed the material through the first bevel tooth 63 and the second bevel tooth 65, and at the same time drives the opening and closing plate 73 to rotate, so that the spreading hole 9 is exposed, which facilitates the falling of the raw material.

[0039] It is worth mentioning that, such as Figures 12 to 14 As shown, the top extension assembly 10 includes a cam 101 rotatably mounted on the base plate 32, a third bevel gear 102 fixedly mounted on the shaft of the cam 101, a connecting shaft 103 rotatably mounted on the base plate 32, a fourth bevel gear 104 fixedly mounted on the connecting shaft 103, and an extension shaft 105 slidably mounted on the base plate 32. The third bevel gear 102 and the fourth bevel gear 104 mesh with each other. The extension shaft 105 passes through the fixed cylinder 72 and is fixedly connected to the spreading roller 8. The connecting shaft 103 is driven by the output shaft of the first motor 51. In use, when the resin sheet is formed and passes through the spreading roller 8, the raw material is sprayed out from the spreading hole 9. The first motor 51 drives the auger 53 to transport the raw material while simultaneously driving the cam 101 through the third bevel gear 102 and the fourth bevel gear 104. The cam 101 rotates, driving the extension shaft 105 and the spreading roller 8 to move back and forth in a small amplitude, so that the raw material is spread more evenly onto the resin sheet, while preventing the spreading hole 9 from becoming blocked. After this spreading is completed, when the resin sheet passes through the pressure roller 11, the raw material is pressed into the resin sheet to obtain the friction sheet. Then, during the continued transmission, it undergoes several more spreading and pressing processes to ensure that the raw material in each friction sheet meets the standard requirements, making the raw material in the friction sheet more uniform and improving its performance. The resin sheet is intermittently transmitted and then the spreading process is carried out to ensure that the raw material in each resin sheet is uniform. After the friction sheet is spread, it is cooled and formed. Then, several friction sheets are stacked together and placed into the pressing machine along with the back plate for pressing.

[0040] Furthermore, such as Figure 1 As shown, a pressure roller 11 is rotatably mounted on the base plate 32.

[0041] Work process The raw materials are divided into several types and placed in the material cylinder 31. After the resin is hot-melted and extruded by the extruder 1, it is transported on the conveyor belt 2. Then, the second motor 61 drives the metering cylinder 43 to rotate, so that the outlet 44 is connected to the discharge pipe 45, and the raw materials in the material cylinder 31 fall into the metering cylinder 43. After the raw materials fall into the conveying cylinder 52 through the metering cylinder 43, the first motor 51 drives the auger 53 to rotate, and the mixed raw materials at the output end of the conveying cylinder 52 are transported to the spreading roller 8. At the same time, the second motor 61 drives the metering cylinder 43 to rotate to discharge the raw materials, and at the same time drives the opening and closing plate 73 to rotate, so that the spreading hole 9 is exposed. When the resin sheet is formed and passes through the spreading roller 8, the raw materials are discharged from the spreading hole 9. At the same time, the first motor 51 drives the auger 53 to transport the raw materials through the third bevel tooth 102 and the fourth bevel tooth 102. 04 drives the cam 101 to rotate, and the cam 101 drives the extension shaft 105 and the spreading roller 8 to move back and forth in a small amplitude, so that the raw material is spread more evenly on the resin sheet, and at the same time, it can prevent the spreading hole 9 from being blocked. After this spreading is completed, when the resin sheet passes through the pressure roller 11, the raw material is pressed into the resin sheet to obtain the friction sheet. Then, during the continued transmission, it goes through several more spreading and pressing processes to make the raw material in the single friction sheet meet the standard requirements, and the raw material in the friction sheet is more uniform, improving performance. The resin sheet is intermittently transmitted and then the spreading process is carried out to ensure that the raw material in each resin sheet is uniform. After the friction sheet is spread, it will be cooled and formed. Then, several friction sheets are stacked together and put into the pressing machine along with the back plate for pressing.

[0042] In the description of this invention, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0043] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0044] The above description, in conjunction with the accompanying drawings, represents only preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention. These modifications and improvements should also be considered within the scope of protection of the present invention and will not affect the effectiveness and practicality of the present invention.

Claims

1. A composite ceramic-based drum brake pad, comprising a backing plate and a friction material, characterized in that: The friction material comprises the following components by weight percentage: 8%-15% cashew nut shell oil modified phenolic resin, 5%-30% ceramic fiber, 5%-10% graphite, 10%-20% steel fiber, 3%-10% alumina, 10%-20% barium sulfate, 5%-10% copper powder, and 3%-8% molybdenum disulfide.

2. A method for preparing the composite ceramic-based drum brake pad according to claim 1, comprising the following steps: Step 1, Extrusion process: The cashew shell oil modified phenolic resin is extruded and formed by an extruder (1) to obtain a single resin sheet, which is then transported on a conveyor belt (2); Step 2, Mixing process: The second motor (61) drives the metering cylinder (43) to rotate, so that the raw materials in the cylinder (31) fall into the auger (53) through the opening (44) at the same time the first motor (51) drives the auger (53) to rotate, and mix the raw materials to obtain a mixture; Step 3, Spreading process: The second motor (61) drives the opening and closing plate (73) to rotate, so that the mixture is spread from the spreading hole (9) onto the resin sheet; Step 4, shaking process: The first motor (51) drives the cam (101) to rotate, so that the spreading roller (8) moves back and forth when spreading the material. After the raw material is evenly spread onto the resin sheet, the resin sheet is pressed by the pressure roller (11) to obtain the friction sheet. Step 5, Pressing process: Place multiple friction pads and back plate in a hot press device for hot pressing molding.

3. The method for preparing a composite ceramic-based drum brake pad according to claim 2, characterized in that: In step two, while the resin sheet is being formed and conveyed, the second motor (61) drives the metering cylinder (43) to rotate, and the inlet (44) is connected to the feed pipe (45) so that the raw material in the cylinder (31) falls into the metering cylinder (43).

4. The method for preparing a composite ceramic-based drum brake pad according to claim 2, characterized in that: In step two, after the raw material falls into the auger (53) through the metering cylinder (43), the first motor (51) drives the auger (53) to rotate, mixes the raw material and conveys it to the spreading roller (8).

5. The method for preparing a composite ceramic-based drum brake pad according to claim 2, characterized in that: In step three, when the second motor (61) drives the metering cylinder (43) to connect with the feeding pipe (45), the second motor (61) drives the opening and closing plate (73) to rotate, and the raw material is sprinkled onto the resin sheet through the sprinkling hole (9).

6. The method for preparing a composite ceramic-based drum brake pad according to claim 2, characterized in that: In step four, the first motor (51) drives the cam (101) to rotate, and the cam (101) drives the extension shaft (105) to move back and forth. The spreading roller (8) makes a small-amplitude back and forth swaying motion when spreading the material, so that the raw material is evenly spread onto the surface of the resin sheet.

7. The method for preparing a composite ceramic-based drum brake pad according to claim 2, characterized in that: In step four, after the raw material is sprinkled onto the resin sheet, it is pressed by the pressure roller (11) to obtain a friction sheet. During the continued transmission of the friction sheet, the sprinkling process is repeated several times to make the raw material in the friction sheet reach the standard.

8. The method for preparing a composite ceramic-based drum brake pad according to claim 2, characterized in that: In step five, several friction pads are stacked after being formed, and then placed in a press with the back plate for pressing and shaping.

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