Aluminum matrix composite split type brake disc and production method thereof

Abstract

The invention relates to the field of brake discs, in particular to an aluminum matrix composite split type brake disc and a production method thereof, and solves the problems that an existing brake disc is large in total weight, low in heat dissipation performance and prone to rusting, meanwhile, the brake disc is a whole, after cracks, local damage or excessive abrasion occurs, overall replacement is needed, and the brake disc is inconvenient to replace. The maintenance cost is high and the consumed time is long. The aluminum matrix composite split type brake disc comprises a center disc, an assembly disc is detachably installed at the bottom end of the center disc, a brake disc body is installed below the assembly disc, the brake disc body comprises four symmetrical split brake pads, through assembly positioning holes are formed in the split brake pads, and the assembly positioning holes are communicated with the assembly positioning holes. And assembly connecting blocks are mounted on the inner sides of the assembly positioning holes. By forming a composite wear-resistant layer on the assembly disc, the split brake pad, the covering sheet and the positioning block, the weight of the brake disc is reduced, the heat dissipation efficiency is improved, the service life is prolonged, and the brake disc is not prone to rusting.

Description

Technical Field

[0001] This invention relates to the field of brake discs, specifically to a split-type brake disc made of aluminum-based composite material and its manufacturing method. Background Technology

[0002] Brakes are the braking devices used by cars for braking and emergency braking. Brakes can be divided into disc brakes and drum brakes. Drum brakes are sealed and shaped like drums. In China, they are also called brake drums. When driving, they rotate. Inside the drum brake are two arc-shaped or semi-circular brake shoes. When the brake is applied, the two brake shoes are spread outward under the action of the brake wheel cylinder, which lifts the brake shoes and rubs against the inner wall of the brake drum to slow down or stop the car.

[0003] Disc brakes generate braking force by clamping the brake disc with a brake caliper. When you press the brake pedal, it is the caliper that clamps the brake disc to slow down or stop the vehicle. Disc brakes have better heat dissipation than drum brakes and are less prone to heat fade under high-speed braking conditions, so they have better high-speed braking performance. Disc brakes are mainly composed of brake calipers and brake discs, with the brake disc being a round plate and the key component of the brake.

[0004] Existing brake discs are heavy, have poor heat dissipation, and are prone to rust. Furthermore, since brake discs are a single unit, they need to be replaced as a whole when cracks, partial damage, or excessive wear occur, resulting in high maintenance costs and long maintenance times. Therefore, they do not meet the current requirements. To address this, we propose a split brake disc made of aluminum-based composite material and its manufacturing method. Summary of the Invention

[0005] The purpose of this invention is to provide a split-type brake disc made of aluminum-based composite material and its manufacturing method, so as to solve the problems mentioned in the background art, such as the large total weight of existing brake discs, low heat dissipation performance and easy rusting, and the fact that the brake disc is a whole, and after cracks, local damage or excessive wear, it needs to be replaced as a whole, resulting in high maintenance costs and long time consumption.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an aluminum-based composite material split brake disc, comprising a center disc, an assembly disc detachably mounted at the bottom of the center disc, a brake disc mounted below the assembly disc, the brake disc comprising four symmetrical split brake pads, each split brake pad having a through assembly positioning hole inside, an assembly connecting block mounted on the inner side of the assembly positioning hole, the assembly disc and the split brake pads being connected via the assembly connecting block, two symmetrically distributed insertion slots on the bottom surface of the assembly positioning hole, and two anti-detachment slots on the inner wall of the top of the assembly positioning hole;

[0007] The assembly connection block includes a splicing block, which is embedded in the upper surface of the assembly tray, and the bottom surface of the splicing block is flush with the bottom surface of the assembly tray. A positioning block is detachably installed below the splicing block. The positioning block is inserted into the assembly positioning hole and its top end is in contact with the bottom surface of the splicing block. A locking block is slidably installed at the bottom end of the positioning block. Anti-detachment blocks are provided on both sides of the locking block. A return spring is installed between the anti-detachment block and the cover plate. The anti-detachment block is slidably installed inside the positioning block and its side edge passes through the positioning block. The anti-detachment block passes through the side edge of the positioning block and slides into the anti-detachment slot. A locking screw is inserted through the middle of the locking block and is threadedly connected to the splicing block.

[0008] Preferably, the bottom end of the positioning block has two positioning grooves, a cover plate is detachably installed below the positioning block, and two plug-in blocks are fixed on the upper surface of the cover plate.

[0009] Preferably, the size of the plug-in block is the same as the size of the positioning groove, the plug-in block passes through the positioning groove and is inserted into the plug-in groove, the bottom surface of the cover plate is flush with the bottom surface of the split brake pad, and separation grooves are provided on both sides of the bottom end of the cover plate, and the top of the separation groove bends into the cover plate in an L-shape.

[0010] Preferably, the outer bottom end of the central disk and the outer top end of the assembly disk are provided with a plurality of through holes arranged in a circular array around the axis of the central disk, and stainless steel rivets are inserted in the through holes, and the central disk and the assembly disk are connected by stainless steel rivets.

[0011] Preferably, the central disk is a silicon carbide aluminum composite material with a SiC volume fraction of 5-20%, a density of 2.82-2.85 g / cm3, a tensile strength of 540-580 MPa, a specific stiffness of 34-38 E / P, and a coefficient of thermal expansion of 0.16-0.17.

[0012] Preferably, the material of the split brake pad, cover plate and positioning block is HT250 gray cast iron. The surface of the split brake pad and cover plate has a 0.05-0.25mm thick composite wear-resistant layer with corrosion resistance and high strength. The raw material of the composite wear-resistant layer on the surface of the split brake pad and cover plate is laser cladding powder, which is processed by ultra-high speed laser melting process.

[0013] Preferably, the laser cladding powder formulation includes C, Cr, B, Si, Fe, and Ni in a mass ratio of percentage: C (0.5-1.1), Cr (15-20), B (3.5-4.5), Si (3.5-5.5), Fe (less than 17), and Ni (balance). The powder particle size is 150-300 mesh, and the surface hardness of the cladding layer is HRC55-65.

[0014] Preferably, the outer side of the assembly tray is coated with a protective coating, which comprises inositol hexaphosphate, defoamer, wetting and dispersing agent, aluminum powder, graphite powder and water in a mass ratio of 10-20, defoamer (1-5), wetting and dispersing agent (2-10), aluminum powder (5-10), graphite powder (10-20) and water (30-40).

[0015] A method for producing a split brake disc made of aluminum-based composite material includes the following steps:

[0016] S1: First, the center disc, assembly disc, and brake disc are processed. The silicon carbide aluminum composite material is subjected to electromagnetic stirring and fusion reaction. Then, the raw materials are processed using low-pressure casting process and T-aging heat treatment to prepare the center disc blank.

[0017] S2: The prepared center disk is rough-machined, the blank is dimensionally adjusted, and after rough machining, the blank is fine-machined to obtain the finished center disk.

[0018] S3: Subsequently, HT250 gray cast iron blanks are used to mill the assembly disc, split brake pads, cover plates and positioning blocks to obtain blanks for the assembly disc, split brake pads, cover plates and positioning blocks.

[0019] S4: Perform two processes, rough machining and fine machining, on the blanks of the assembly disc, split brake pads, cover plates and positioning blocks to prepare the finished assembly disc, split brake pads, cover plates and positioning blocks;

[0020] S5: Subsequently, a layer of laser cladding powder is attached to the outer surface of the split brake pads, cover plates, and positioning blocks. The laser cladding powder on the outer surface of the split brake pads, cover plates, and positioning blocks is processed using an ultra-high-speed laser cladding process, so that the laser cladding powder forms a composite wear-resistant layer with a thickness of 0.05-0.25mm on the outside of the split brake pads, cover plates, and positioning blocks. This composite wear-resistant layer has corrosion resistance and high strength characteristics. A protective coating is also applied to the outside of the assembled disc to prevent the assembled disc from rusting during use.

[0021] S6: The laser power during the ultra-high-speed laser processing is 6-8KW. The laser cladding powder is fed by a coaxial powder feeding nozzle. The cladding speed is 0.6-3m / hr, the deposition efficiency can reach up to 500cm2 / min, the single-layer cladding thickness is 0.05-0.25mm, and the single-sided cladding time is 30-60 seconds.

[0022] S7: Next, two grinding wheels are used to grind and polish the assembly disc, split brake pads, cover plates, and positioning blocks to ensure that the parallelism and cross-sectional runout of the assembly disc, split brake pads, cover plates, and positioning blocks meet the processing requirements, and to minimize the thickness difference of the assembly disc, split brake pads, cover plates, and positioning blocks. Finally, the completed assembly disc and split brake pads are assembled using assembly connecting blocks, and then the center disc is riveted to the assembly disc using a riveting machine and stainless steel rivets to obtain the finished brake disc.

[0023] 1. This invention uses a tool to rotate the locking screw, which enters the bottom of the splicing block and presses the locking block into the positioning block. At this time, the locking block pushes two anti-detachment blocks out from the side of the positioning block, so that the anti-detachment blocks are inserted into the anti-detachment slots. The splicing block, positioning block, anti-detachment blocks, locking block, and locking screw are used to connect the assembly disc and the split brake pads. The installation operation is convenient and quick. Conversely, when the locking screw is separated from the splicing block using a tool, the locking block will fall from the bottom of the positioning block. At this time, the return spring elastically returns and drives the anti-detachment blocks to retract into the positioning block, so that the positioning block loses connection with the split brake pads. At this time, the assembly disc and the split brake pads can be separated from each other, which facilitates the disassembly and replacement of damaged split brake pads, reduces maintenance costs, shortens maintenance time, and improves work efficiency.

[0024] 2. This invention uses HT gray cast iron as raw material to prepare the assembly disc, split brake pads, cover plates and positioning blocks, thereby reducing the weight of the finished product. A layer of laser cladding powder is attached to the assembly disc, split brake pads, cover plates and positioning blocks, and the laser cladding powder is melted using ultra-high speed laser technology to form a composite wear-resistant layer on the assembly disc, split brake pads, cover plates and positioning blocks, thereby reducing the weight of the brake disc, improving heat dissipation efficiency, extending service life and making it less prone to rust.

[0025] 3. The present invention uses a cover plate to cover the positioning block to avoid gaps on the split brake pads, and uses the cover plate instead of the positioning block to avoid wear during braking, thus preventing the locking screw from becoming unremovable after damage. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the brake disc structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the assembly positioning hole structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the split brake pad of the present invention;

[0030] Figure 5This is a schematic diagram of the assembly connecting block of the present invention;

[0031] Figure 6 This is a cross-sectional view of the assembly connecting block of the present invention;

[0032] Figure 7 for Figure 6 Enlarged view of the structure at point A in the middle.

[0033] In the diagram: 1. Center disc; 2. Assembly disc; 3. Stainless steel rivet; 4. Brake disc; 401. Split brake pad; 402. Assembly positioning hole; 403. Insertion groove; 404. Anti-detachment groove; 5. Assembly connecting block; 501. Splicing block; 502. Cover plate; 503. Positioning block; 504. Insertion block; 505. Separation groove; 506. Anti-detachment block; 507. Locking block; 508. Locking screw; 509. Return spring. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0035] like Figures 1 to 4 As shown, an aluminum-based composite material split brake disc includes a center disc 1, an assembly disc 2 detachably mounted at the bottom of the center disc 1, a brake disc 4 mounted below the assembly disc 2, and the brake disc 4 including four symmetrical split brake pads 401. The interior of each split brake pad 401 is provided with a through assembly positioning hole 402, and an assembly connecting block 5 is installed on the inner side of the assembly positioning hole 402. The assembly disc 2 and the split brake pads 401 are connected by the assembly connecting block 5. The bottom surface of the assembly positioning hole 402 has two symmetrically distributed insertion slots 403, and the top inner wall of the assembly positioning hole 402 has two anti-detachment slots 404.

[0036] like Figure 1 , Figure 2 , Figures 5 to 7As shown, the assembly connecting block 5 includes a splicing block 501, which is embedded in the upper surface of the assembly tray 2, and the bottom surface of the splicing block 501 is flush with the bottom surface of the assembly tray 2. A positioning block 503 is detachably installed below the splicing block 501. The positioning block 503 is inserted into the assembly positioning hole 402 and its top end is in contact with the bottom surface of the splicing block 501. A locking block 507 is slidably installed at the bottom end of the positioning block 503. Anti-detachment blocks 506 are provided on both sides of the locking block 507. A return spring 509 is installed between the anti-detachment block 506 and the cover plate 502. The anti-detachment block 506 is slidably installed inside the positioning block 503 and one side of the anti-detachment block 506 penetrates through the positioning block 503. The anti-detachment block 506 is slidably engaged in the anti-detachment groove 404 through the side of the positioning block 503. A locking screw 508 is inserted through the middle of 507. The locking screw 508 is connected to the splicing block 501 by threads. Using a tool, the locking screw 508 is rotated, and it enters the bottom of the splicing block 501, pressing the locking block 507 into the positioning block 503. At this time, the locking block 507 pushes two anti-detachment blocks 506 out from the side of the positioning block 503, so that the anti-detachment blocks 506 are inserted into the anti-detachment slots 404. The splicing block 501, positioning block 503, anti-detachment blocks 506, locking block 507, and locking screw 508 are used to connect the assembly disc 2 and the split brake pad 401. Disassembly and installation are convenient, and it is easy to replace the damaged split brake pad 401, reducing maintenance costs, shortening maintenance time, and improving work efficiency.

[0037] The bottom of the positioning block 503 has two positioning grooves. A cover plate 502 is detachably installed below the positioning block 503. Two plug-in blocks 504 are fixed on the upper surface of the cover plate 502. The size of the plug-in blocks 504 is the same as the size of the positioning groove. The plug-in blocks 504 pass through the positioning groove and are inserted into the plug-in groove 403. The bottom surface of the cover plate 502 is flush with the bottom surface of the split brake pad 401. The cover plate 502 covers the positioning block 503 to avoid gaps on the split brake pad 401. The cover plate 502 replaces the positioning block 503 for wear during braking, preventing the locking screw 508 from being unable to be removed after damage.

[0038] Separation grooves 505 are provided on both sides of the bottom end of the cover plate 502. The top of the separation groove 505 bends into the interior of the cover plate 502 in an L-shape. When the split brake pad 401 is worn out and needs to be replaced, the cover plate 502 will wear out synchronously with the split brake pad 401, causing the separation groove 505 to be exposed. At this time, the operator uses a tool to insert into the separation groove 505 and pulls the cover plate 502 out from the bottom surface of the split brake pad 401, which makes it easy to disassemble the locking screw 508 and facilitate the replacement of the split brake pad 401.

[0039] In the preferred embodiment, the central disk 1 is made of silicon carbide aluminum composite material with a SiC volume fraction of 5-20%, a density of 2.82-2.85 g / cm3, a tensile strength of 5040-locking screw of 5080 MPa, a specific stiffness of 34-38 E / P, and a coefficient of thermal expansion of 0.16-0.17.

[0040] The split brake pad 401, cover plate 502 and positioning block 503 are all made of HT250 gray cast iron. The surface of the split brake pad 401 and cover plate 502 has a 0.05-0.25mm thick composite wear-resistant layer that is corrosion resistant and has high strength. The raw material of the composite wear-resistant layer is laser cladding powder, which is processed and prepared using an ultra-high speed laser melting process.

[0041] The laser cladding powder formulation includes C, Cr, B, Si, Fe, and Ni, in a mass ratio of percentage: C (0.5-1.1), Cr (15-20), B (3.5-4.5), Si (3.5-5.5), Fe (less than 17), and Ni (balance). The powder particle size is 150-300 mesh, and the surface hardness of the cladding layer is HRC55-65.

[0042] The outer side of the assembly tray 2 is coated with a protective coating, which includes inositol hexaphosphate, defoamer, wetting and dispersing agent, aluminum powder, graphite powder and water in a mass ratio of 10-20, defoamer (1-5), wetting and dispersing agent (2-10), aluminum powder (5-10), graphite powder (10-20) and water (30-40).

[0043] like Figure 1 As shown, the outer bottom of the central disk 1 and the outer top of the assembly disk 2 are provided with multiple through holes arranged in a circular array around the axis of the central disk 1. Stainless steel rivets 3 are inserted into the through holes, and the central disk 1 and the assembly disk 2 are connected by stainless steel rivets 3.

[0044] Working principle: The splicing block 501 is embedded in the surface of the assembly plate 2, and the positioning block 503 is inserted into the inner side of the assembly positioning hole 402. Then, the split brake pad 401 is attached to the bottom surface of the assembly connecting block 5, ensuring that the top of the positioning block 503 is in contact with the bottom of the splicing block 501. At this time, the locking block 507 is slidably inserted into the bottom of the positioning block 503, and the locking screw 508 is passed through the locking block 507. The locking screw 508 is tightened with a tool, so that the locking screw 508 presses the locking block 507 into the positioning block 503, and the anti-detachment block 506 is squeezed out from the side of the positioning block 503 by the locking block 507, so that the anti-detachment block 506 is inserted into the anti-detachment slot 404. Until the locking block 507 is fully inserted into the positioning block 503 and cannot move, the locking block 507, positioning block 503, locking screw 508 and splicing block 501 connect the split brake pad 401 to the assembly disc 2. Then, the cover plate 502 is placed on the bottom surface of the positioning block 503, and the insertion block 504 is made to pass through the bottom end of the positioning block 503 and be aligned with the insertion slot 403. The cover plate 502 is then tapped with a copper rod to make it enter the assembly positioning hole 402 and fit against the positioning block 503. At the same time, the bottom surface of the cover plate 502 is flush with the bottom surface of the split brake pad 401, thus assembling the brake disc. The operation is simple and quick, shortens the assembly time, and improves the assembly efficiency.

[0045] A method for producing a split brake disc made of aluminum-based composite material, the method comprising the following steps:

[0046] S1: First, the center disc 1, assembly disc 2, and brake disc 4 are processed. The silicon carbide aluminum composite material is subjected to electromagnetic stirring and fusion reaction. Then, the raw materials are processed by low-pressure casting process and T6 aging heat treatment to prepare the center disc 1 blank.

[0047] S2: The prepared center disk 1 is rough-machined, the size of the blank is adjusted, and the blank is finished after rough machining to obtain the finished center disk 1.

[0048] S3: Subsequently, the assembly disc 2, the split brake pad 401, the cover plate 502 and the positioning block 503 are milled using HT250 gray cast iron blanks to obtain the blanks of the assembly disc 2, the split brake pad 401, the cover plate 502 and the positioning block 503.

[0049] S4: Perform two processes, rough machining and fine machining, on the blanks of the assembly disc 2, the split brake pad 401, the cover plate 502 and the positioning block 503 to prepare the finished assembly disc 2, the split brake pad 401, the cover plate 502 and the positioning block 503.

[0050] S5: Subsequently, a layer of laser cladding powder is attached to the outer surface of the split brake pad 401, cover plate 502 and positioning block 503, and the laser cladding powder on the outer surface of the split brake pad 401, cover plate 502 and positioning block 503 is processed using ultra-high speed laser cladding process, so that the laser cladding powder forms a composite wear-resistant layer with a thickness of 0.05-0.25mm on the outside of the split brake pad 401, cover plate 502 and positioning block 503. This composite wear-resistant layer has corrosion resistance and high strength characteristics, and a protective coating is applied to the outside of the assembly disc 2 to prevent the assembly disc from rusting during use;

[0051] S6: The laser power during the ultra-high-speed laser processing is 6-8KW. The laser cladding powder is fed by a coaxial powder feeding nozzle. The cladding speed is 0.6-3m / hr, the deposition efficiency can reach up to 500cm2 / min, the single-layer cladding thickness is 0.05-0.25mm, and the single-sided cladding time is 30-60 seconds.

[0052] S7: Next, two grinding wheels are used to grind and polish the assembly disc 2, the split brake pad 401, the cover plate 502, and the positioning block 503 to ensure that the parallelism and cross-sectional runout of the assembly disc 2, the split brake pad 401, the cover plate 502, and the positioning block 503 meet the composite processing requirements, and to ensure that the thickness difference of the assembly disc 2, the split brake pad 401, the cover plate 502, and the positioning block 503 is minimized. Finally, the completed assembly disc 2 and the split brake pad 401 are assembled using the assembly connecting block 5, and then the center disc 1 is riveted to the assembly disc 2 using a riveting machine and stainless steel rivets 3 to obtain the finished brake disc.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A split brake disc made of aluminum-based composite material, comprising a center disc (1), characterized in that: The bottom of the center disc (1) is detachably fitted with an assembly disc (2). A brake disc (4) is installed below the assembly disc (2). The brake disc (4) includes four symmetrical split brake pads (401). The split brake pads (401) have through assembly positioning holes (402) inside. An assembly connecting block (5) is installed on the inner side of the assembly positioning holes (402). The assembly disc (2) and the split brake pads (401) are connected by the assembly connecting block (5). The bottom surface of the assembly positioning holes (402) has two symmetrically distributed insertion slots (403). The top inner wall of the assembly positioning holes (402) has two anti-detachment slots (404). The assembly connecting block (5) includes a splicing block (501), which is embedded in the upper surface of the assembly plate (2), and the bottom surface of the splicing block (501) is flush with the bottom surface of the assembly plate (2). A positioning block (503) is detachably installed below the splicing block (501). The positioning block (503) is inserted into the inner side of the assembly positioning hole (402) and its top end is in contact with the bottom surface of the splicing block (501). A locking block (507) is slidably installed at the bottom end of the positioning block (503). Both sides of the locking block (507) are... An anti-detachment block (506) is provided, and a return spring (509) is installed between the anti-detachment block (506) and the cover plate (502). The anti-detachment block (506) is slidably installed inside the positioning block (503) and one side of the positioning block (503) passes through the positioning block (503). The anti-detachment block (506) passes through the side of the positioning block (503) and is slidably engaged in the anti-detachment groove (404). A locking screw (508) is inserted through the middle of the locking block (507). The locking screw (508) is threadedly connected to the splicing block (501).

2. The aluminum-based composite material split brake disc according to claim 1, characterized in that: The bottom end of the positioning block (503) has two positioning grooves, and a cover plate (502) is detachably installed below the positioning block (503). Two plug-in blocks (504) are fixed on the upper surface of the cover plate (502).

3. The aluminum-based composite material split brake disc according to claim 2, characterized in that: The size of the plug-in block (504) is the same as the size of the positioning groove. The plug-in block (504) passes through the positioning groove and is inserted into the plug-in groove (403). The bottom surface of the cover plate (502) is flush with the bottom surface of the split brake pad (401). The bottom end of the cover plate (502) is provided with 55 on both sides. The top of the 55 is bent into the cover plate (502) in an L-shape.

4. The aluminum-based composite material split brake disc according to claim 1, characterized in that: The bottom outer side of the central disk (1) and the top outer side of the assembly disk (2) are provided with multiple through holes arranged in a circular array around the axis of the central disk (1). Stainless steel rivets (3) are inserted in the through holes, and the central disk (1) and the assembly disk (2) are connected by stainless steel rivets (3).

5. The aluminum-based composite material split brake disc according to claim 1, characterized in that: The central disk (1) is a silicon carbide aluminum composite material with a SiC volume fraction of 5-20%, a density of 2.82-2.85 g / cm3, a tensile strength of 540-580 MPa, a specific stiffness of 34-38 E / P, and a coefficient of thermal expansion of 0.16-0.

17.

6. The aluminum-based composite material split brake disc according to claim 1, characterized in that: The split brake pad (401), cover plate (502) and positioning block (503) are all made of HT250 gray cast iron. The surfaces of the split brake pad (401) and cover plate (502) have a 0.05-0.25mm thick composite wear-resistant layer that is corrosion resistant and has high strength. The raw material for the composite wear-resistant layer on the surface of the split brake pad (401) and cover plate (502) is laser cladding powder, which is processed by ultra-high speed laser melting process.

7. A split-type brake disc made of aluminum-based composite material according to claim 6, characterized in that: The laser cladding powder formulation includes C, Cr, B, Si, Fe, and Ni, in a mass ratio of C (0.5-1.1), Cr (15-20), B (3.5-4.5), Si (3.5-5.5), Fe (less than 17), and Ni (balance). The powder particle size is 150-300 mesh, and the surface hardness of the cladding layer is HRC55-65.

8. The aluminum-based composite material split brake disc according to claim 1, characterized in that: The outer surface of the assembly tray (2) is coated with a protective coating, which includes inositol hexaphosphate, defoamer, wetting and dispersing agent, aluminum powder, graphite powder and water in a mass ratio of 10-20, defoamer (1-5), wetting and dispersing agent (2-10), aluminum powder (5-10), graphite powder (10-20) and water (30-40).

9. A method for producing a split-type brake disc of aluminum-based composite material according to any one of claims 1-8, characterized in that: The production method includes the following steps: S1: First, the center disc (1), assembly disc (2), and brake disc (4) are processed. The silicon carbide aluminum composite material is subjected to electromagnetic stirring and fusion reaction. Then, the raw materials are processed by low-pressure casting process and T6 aging heat treatment to prepare the center disc (1) blank. S2: The prepared center disk (1) is rough machined, the blank is dimensionally adjusted, and after rough machining, the blank is finely machined to obtain the finished center disk (1). S3: Subsequently, HT250 gray cast iron blanks were used to mill the assembly disc (2), the split brake pad (401), the cover plate (502) and the positioning block (503) to obtain the blanks of the assembly disc (2), the split brake pad (401), the cover plate (502) and the positioning block (503). S4: Perform two processes, rough machining and fine machining, on the blanks of the assembly disc (2), split brake pad (401), cover plate (502) and positioning block (503) to prepare the finished assembly disc (2), split brake pad (401), cover plate (502) and positioning block (503). S5: Subsequently, a layer of laser cladding powder is attached to the outer surface of the split brake pad (401), cover plate (502) and positioning block (503), and the laser cladding powder on the outer surface of the split brake pad (401), cover plate (502) and positioning block (503) is processed by ultra-high speed laser cladding process, so that the laser cladding powder forms a composite wear-resistant layer with a thickness of 0.05-0.25mm on the outside of the split brake pad (401), cover plate (502) and positioning block (503). This composite wear-resistant layer has corrosion resistance and high strength characteristics, and a protective coating is applied to the outside of the assembly disc (2) to prevent the assembly disc from rusting during use. S6: The laser power during the ultra-high-speed laser processing is 6-8KW. The laser cladding powder is fed by a coaxial powder feeding nozzle. The cladding speed is 0.6-3m / hr, the deposition efficiency can reach up to 500cm2 / min, the single-layer cladding thickness is 0.05-0.25mm, and the single-sided cladding time is 30-60 seconds. S7: Next, use two grinding wheels to grind and polish the assembly disc (2), split brake pads (401), cover plates (502) and positioning blocks (503) to ensure the parallelism and cross-sectional runout of the assembly disc (2), split brake pads (401), cover plates (502) and positioning blocks (503) meet the composite processing requirements, and ensure that the thickness difference of the assembly disc (2), split brake pads (401), cover plates (502) and positioning blocks (503) is minimized. Finally, assemble the completed assembly disc (2) and split brake pads (401) using assembly connecting blocks (5), and then use a riveting machine and stainless steel rivets (3) to rivet the center disc (1) to the assembly disc (2) to obtain the finished brake disc.

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