A process for manufacturing a bicycle brake disc

Abstract

The application discloses a bicycle brake disc preparation process and belongs to the brake disc processing technical field. The brake disc preparation process can reduce the hook-shaped structure of the convex spike on the back steel of the produced brake disc, and the convex spike and the back steel have high structural strength and are not prone to breaking. The process comprises the following steps: unwinding and flattening, unwinding the steel roll and flattening the steel roll multiple times through the flattening mechanism in the processing flow line; heating the top surface; heating the flattened steel through the point heating mechanism in the processing flow line to form a plurality of groups of heating points on the top surface of the steel, and the plurality of groups of heating points are arranged at intervals. The application can ensure that the back steel and the friction material of the produced brake disc are firmly connected, the convex spike structure on the back steel has high connection strength with the back steel, and the convex spike is not prone to being bent during the process of the convex spike structure on the back steel penetrating into the friction material.

Description

Technical Field

[0001] This invention relates to the field of brake disc processing technology, and more particularly to a process for manufacturing bicycle brake discs. Background Technology

[0002] Brake discs are a key component of the braking system, responsible for converting kinetic energy into heat energy to achieve deceleration or stopping. They are typically made of friction materials, which generate friction when in contact with the brake disc, thus applying braking force to the wheels. The friction performance, wear resistance, and thermal stability of brake discs are important indicators of their quality.

[0003] In existing technology, the back steel portion of brake discs is typically perforated. This design helps enhance the shear force between the back steel and the friction material during braking. However, improper operation during the punching and perforation process can lead to deformation of the back steel. This deformation may not only affect the tight bond between the back steel and the friction material but also adversely impact the overall load-bearing capacity of the back steel, thereby weakening its original strength to some extent.

[0004] Secondly, in existing technologies, an adhesive is coated on the brake disc back steel, and the friction material is bonded together by heating and pressurizing with the adhesive to ensure that the friction material can be stably installed on the brake disc back steel. At the same time, the final brake disc will not have structural strength problems. However, compared with the perforated brake disc, the shear strength between the brake disc back steel and the friction material is relatively weak.

[0005] Therefore, there is also a type of brake disc in the prior art where the back steel of the brake disc is formed with protrusions through processing. Examples include the brake with a pointed back steel structure in application number CN200920006823.X, a brake disc with a protruding back steel structure in application number CN201210158572.3, and a composite disc brake backplate in application number CN201380072000.6. However, the protrusions on the back steel of the above-mentioned brake discs are basically achieved through the process described in the batch texturized material sheets in applications CN201611205540.9 and CN201380027691.8, which involves "feeding a flat material sheet continuously; and as the sheet is fed, repeatedly impacting the sheet with a toothed cutter, so that each cutter generates a row of raised and generally sharp structures on the sheet to texturize the sheet; the cutter is generally driven downward and passes through the sheet to chisel out sharp structures from the sheet; the sharp structures have an inclined or hook-shaped shape."

[0006] Furthermore, the aforementioned case also mentions that "sheets can be cooled or heated before impact to make them more pliable or otherwise more receptive to texturing operations. For example, soft and tough materials (including materials with a Shore hardness below the recommended D55) can be cooled or frozen to apply this treatment method."

[0007] It is important to note that, according to the aforementioned existing technology, the sharp result obtained by cutting the top surface of the softened sheet with a toothed cutter is a burr. Cooling or heating is used to make the sheet more flexible for texturing operations (i.e., easier to form burrs). The burrs are basically inclined or hook-shaped. The formed friction material is then placed on the brake disc backing with burrs and pressed by a press, so that the inclined or hook-shaped burrs can be inserted into the friction material and form a barbed structure to prevent the brake disc backing from separating from the friction material. However, in actual production, it has been found that the burrs are formed integrally from the material itself by chiseling or scraping it from the surface of the material with a toothed cutter. The connection strength between the backing and the burrs obtained in this way is not good. While the inclined burrs can be easily inserted into the friction material, the hook-shaped burrs with a large bend may fail to insert into the friction material if the sharp end of the hook-shaped burr maintains too small a relative angle with the contact surface of the friction material, resulting in connection failure.

[0008] In the above situation, problems will arise once the shear force of the back steel of the entire brake disc is connected to the friction material. Therefore, a manufacturing process is needed to reduce the hook-like structure of the protrusions on the back steel of the brake disc, and the protrusions and the back steel are required to have high structural strength and not easily break.

[0009] Therefore, a bicycle brake disc manufacturing process is proposed to solve or alleviate the above problems. Summary of the Invention

[0010] The purpose of this invention is to address the shortcomings of existing technologies by proposing a manufacturing process for bicycle brake discs.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A manufacturing process for bicycle brake discs includes the following steps.

[0013] Unwinding and flattening involves unwinding the steel coil and flattening it multiple times through a flattening mechanism in the processing line.

[0014] The steel is heated from the top surface. After being flattened, the steel is heated by a point heating mechanism in the processing line, forming several sets of heating points on the top surface of the steel. The sets of heating points are spaced apart, and each set of heating points includes several heating points distributed in a rectangular array. The steel located at the heating point is heated to 800°C.

[0015] After being punched and shaped, the heated steel is transported to the forming mechanism in the processing line. The forming mechanism carries a V-shaped blade and punches it into the top surface of the steel at the heating point at an angle. Then it deflects to be perpendicular to the steel and stays still for 2 seconds, forming a protruding spike structure on the top surface of the steel at the heating point.

[0016] The stamping guide, the steel with the protruding structure is stamped by the stamping mechanism in the processing line, and the stamped part falls into the cooling water to complete the quenching and discharge, and the rough billet back steel is obtained.

[0017] Post-processing and output: After the rough back steel is galvanized, it is hot-pressed and assembled with the friction liner, and then output.

[0018] Preferably, the processing line includes a flattening mechanism, a point heating mechanism, a forming mechanism, and a stamping mechanism arranged in sequence. The flattening mechanism is used to flatten the steel coil. The point heating mechanism is used to heat the top surface of the steel at several points and form several sets of spaced heating points. The forming mechanism is used to punch, bend, and shape the steel at the heating points to form a protruding structure on the top surface of the steel. The stamping mechanism is used to stamp the steel with a single set of heating points and complete the quenching.

[0019] Preferably, the flattening mechanism includes a primary frame, two side plates fixedly connected to the top surface of the primary frame, several primary rollers rotatably connected between the two side plates, four sets of primary clamping roller assemblies, and a secondary frame. Two sets of the primary clamping roller assemblies are arranged on the top surface of the primary frame, and the other two sets of the primary clamping roller assemblies are arranged on the top surface of the secondary frame. Each primary clamping roller assembly includes a primary roller frame, a primary lower clamping roller rotatably connected within the primary roller frame, a primary slide block that slides vertically within the primary roller frame, and a primary upper clamping roller rotatably connected to the primary slide block and located above the primary lower clamping roller.

[0020] Preferably, the point heating mechanism includes a three-stage frame, two-stage clamping roller groups disposed at both ends of the three-stage frame along its length, two sets of two-stage roller groups disposed on the top surface of the three-stage frame and located between the two sets of clamping roller groups, a heat exchanger disposed on one side of the three-stage frame, a high-temperature molten salt pump connected to the heat exchanger via a primary heat-conducting pipe, a secondary heat-conducting pipe connected to the outlet of the high-temperature molten salt pump, a point heating component connected to the secondary heat-conducting pipe and located above the three-stage frame, and a tertiary heat-conducting pipe connecting the point heating component and the heat exchanger. The fluid circuit formed by the heat exchanger, the primary heat-conducting pipe, the secondary heat-conducting pipe, the point heating component, and the tertiary heat-conducting pipe is filled with molten salt in a molten state. The point heating component is located between the two sets of two-stage roller groups. The two-stage roller groups include a secondary roller frame fixedly connected to the three-stage frame and secondary rollers rotatably connected within the secondary roller frame.

[0021] Preferably, the point heating assembly includes two constricted tubes and a square tube connecting the two constricted tubes. The cross-sectional area of ​​the flow channel of the square tube is the same as the cross-sectional area of ​​the flow channel at the small end of the constricted tube. A plurality of lower cylinders, spaced apart and communicating with the interior of the square tube, are fixedly connected to the bottom surface of the square tube. The lower cylinders are cylindrical, and the cross-sectional area of ​​the opening at the connection between the lower cylinder and the square tube is smaller than the inner cross-sectional area of ​​the lower cylinder. A piston is slidably connected to the lower cylinder and sealed to its inner circumferential wall. A heating rod is fixedly connected to the bottom surface of the piston, penetrating the bottom surface of the lower cylinder to the outside. A sealed space is formed between the piston and the inner bottom surface of the lower cylinder, and the sealed space is filled with air. Both the piston and the heating rod are made of copper-tungsten alloy.

[0022] Preferably, the forming mechanism includes a four-stage frame, a two-stage clamping roller group mounted on the four-stage frame, three groups of two-stage idler rollers, and a support frame fixedly connected between the two-stage idler roller groups and the two-stage clamping roller groups. Several connecting seats are provided along the length of the top surface of the support frame. A connecting frame is rotatably connected to each connecting seat. A hydraulic cylinder is rotatably connected to the end of the connecting frame away from the connecting seat. A long, V-shaped blade is fixedly connected to the telescopic end of the hydraulic cylinder via a mounting seat. A cutting edge is provided at the end of the V-shaped blade away from the mounting seat. An inclined frame is fixedly connected to the side wall of the support frame. An angle exists between the top surface of the inclined frame and the top surface of the support frame. A hydraulic cylinder is fixedly connected to the top surface of the inclined frame, tilted upwards. A hinge seat is fixedly connected to the telescopic end of the hydraulic cylinder. A hinge seat is fixedly connected to the end of the hydraulic cylinder away from its rotatable connection with the connecting frame. A connecting piece is rotatably connected between the hinge seat and the hinge seat.

[0023] Preferably, the stamping mechanism includes a five-stage frame, a worktable fixedly connected to the five-stage frame, a vertical frame fixedly connected to the top surface of the worktable, a top plate fixedly connected to the top surface of the vertical frame, and a stamping hydraulic cylinder fixedly connected to the top plate. The telescopic end of the stamping hydraulic cylinder passes through the top plate and is vertically downward. A connecting plate is fixedly connected to the telescopic end of the stamping hydraulic cylinder. An upper mold is detachably connected to the bottom surface of the connecting plate. A lower mold corresponding to the upper mold is detachably connected to the worktable. A discharge track is also provided on the five-stage frame. The discharge track guides the stamped parts after stamping into cooling water. A displacement component is also provided on the top plate. The displacement component is used to grab the stamped parts and enter them into the discharge track.

[0024] Preferably, the displacement assembly includes a drive hydraulic cylinder fixedly connected to the top plate, a bearing fixedly connected to the top plate, a connecting shaft fixedly connected to the inner ring of the bearing and extending through the top plate, an eccentric block fixedly connected to the lower end of the connecting shaft, an extension rod fixedly connected horizontally to the eccentric block, a displacement cylinder fixedly connected to the end of the extension rod away from the eccentric block and vertically arranged, a receiving seat fixedly connected to the telescopic end of the displacement cylinder, and a pneumatic finger fixedly connected vertically to the receiving seat. A connecting rod is fixedly connected to the upper end of the connecting shaft, and a sliding groove is formed on the top surface of the end of the connecting rod away from the connecting shaft. A cylindrical sliding column is slidably connected in the sliding groove, and one end of the sliding column is fixedly connected to the telescopic end of the drive hydraulic cylinder.

[0025] The present invention has the following beneficial effects:

[0026] This invention ensures that the back steel and friction material in the produced brake disc are firmly connected, and the protruding bar structure on the back steel has a high connection strength with the back steel. During the process of inserting the protruding bar structure into the friction material, the protruding bar is not easily bent. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the processing production line in this invention;

[0029] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0031] Figure 4 for Figure 1 Enlarged view of point C in the middle;

[0032] Figure 5 for Figure 1 Enlarged view of point D in the middle;

[0033] Figure 6 This is a cross-sectional view of the point heating component in this invention;

[0034] Figure 7 for Figure 6 Enlarged view at point E in the middle;

[0035] Figure 8 for Figure 6 Enlarged view of point F in the middle.

[0036] 1. Primary frame; 201. Side plate; 202. Primary idler roller; 3. Primary clamping roller assembly; 301. Primary roller frame; 302. Primary lower clamping roller; 303. Primary slide; 304. Primary upper clamping roller; 4. Secondary frame; 5. Tertiary frame; 6. Secondary idler roller assembly; 601. Secondary roller frame; 602. Secondary idler roller; 7. Heat exchanger; 8. Primary heat pipe; 9. High-temperature molten salt pump; 10. Secondary heat pipe; 11. Narrowing tube; 12. Square tube; 13. Lower cylinder; 14. Piston; 15. Sealing space; 16. Heating rod; 17. Tertiary heat pipe; 18. Secondary clamping roller assembly; 19. Quaternary frame; 20. Support Frame; 21. Inclined frame; 22. Connecting seat; 23. Connecting frame; 24. Hydraulic cylinder one; 25. Hydraulic cylinder two; 26. Hinge seat one; 27. Connecting piece; 28. Hinge seat two; 29. ​​Mounting seat; 30. V-shaped blade; 31. Cutting edge; 32. Five-stage frame; 33. Workbench; 34. Vertical frame; 35. Top plate; 36. Stamping hydraulic cylinder; 37. Connecting plate; 38. Upper mold; 39. Lower mold; 40. Drive hydraulic cylinder; 41. Connecting rod; 42. Bearing; 43. Connecting shaft; 44. Eccentric block; 45. Extension rod; 46. Displacement cylinder; 47. Receiving seat; 48. Pneumatic finger; 49. Discharge track. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this invention, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element 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 this invention.

[0041] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0042] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] A manufacturing process for bicycle brake discs includes the following steps.

[0044] Unwinding and flattening involves unwinding the steel coil and flattening it multiple times through a flattening mechanism in the processing line.

[0045] Top surface heating: After being flattened, the steel is heated by a point heating mechanism in the processing line, forming several sets of heating points on the top surface of the steel. These sets of heating points are spaced apart, and each set of heating points includes several heating points distributed in a rectangular array. The steel located at the heating point is heated to 800°C.

[0046] After being punched and shaped, the heated steel is transported to the forming mechanism in the processing line. The forming mechanism carries a V-shaped blade 30 and punches it into the top surface of the steel at the heating point at an angle. Then it deflects to be perpendicular to the steel and stays still for 2 seconds, forming a protruding spike structure on the top surface of the steel located at the heating point.

[0047] The stamping guide, the steel with the protruding structure is stamped by the stamping mechanism in the processing line, and the stamped part falls into the cooling water to complete the quenching and discharge, and the rough billet back steel is obtained.

[0048] Post-processing and output: After the rough back steel is galvanized, it is hot-pressed and assembled with the friction liner, and then output.

[0049] like Figure 1 As shown, the processing line includes a flattening mechanism, a point heating mechanism, a forming mechanism, and a stamping mechanism arranged in sequence. The flattening mechanism is used to flatten the steel coil, the point heating mechanism is used to heat the top surface of the steel at several points and form several sets of spaced heating points, the forming mechanism is used to punch, bend and shape the steel at the heating points to form a protruding structure on the top surface of the steel, and the stamping mechanism is used to stamp the steel with a single set of heating points and complete the quenching.

[0050] like Figure 2 As shown, the flattening mechanism includes a primary frame 1, two side plates 201 fixedly connected to the top surface of the primary frame 1, several primary rollers 202 rotatably connected between the two side plates 201, four sets of primary clamping rollers 3, and a secondary frame 4. Two sets of primary clamping rollers 3 are arranged on the top surface of the primary frame 1, and the other two sets of primary clamping rollers 3 are arranged on the top surface of the secondary frame 4. The primary clamping rollers 3 include a primary roller frame 301, a primary lower clamping roller rotatably connected in the primary roller frame 301, a primary slide block 303 that slides vertically in the primary roller frame 301, and a primary upper clamping roller 304 rotatably connected to the primary slide block 303 and located above the primary lower clamping roller 302.

[0051] like Figure 3As shown, the point heating mechanism includes a three-stage frame 5, two-stage clamping roller groups 18 disposed at both ends of the length of the three-stage frame 5, two sets of two-stage roller groups 6 disposed on the top surface of the three-stage frame 5 and located between the two sets of clamping roller groups, a heat exchanger 7 disposed on one side of the three-stage frame 5, a high-temperature molten salt pump 9 connected to the heat exchanger 7 through a primary heat conduction pipe 8, a secondary heat conduction pipe 10 connected to the outlet of the high-temperature molten salt pump 9, a point heating component connected to the secondary heat conduction pipe 10 and located above the three-stage frame 5, and a tertiary heat conduction pipe 17 connecting the point heating component and the heat exchanger 7. The fluid circuit formed by the heat exchanger 7, the primary heat conduction pipe 8, the secondary heat conduction pipe 10, the point heating component, and the tertiary heat conduction pipe 17 is filled with molten salt in a molten state. The point heating component is located between the two sets of two-stage roller groups 6. The secondary roller group 6 includes a secondary roller frame 601 fixedly connected to the three-stage frame 5 and a secondary roller 602 rotatably connected within the secondary roller frame 601.

[0052] like Figure 6 , Figure 7 and Figure 8 As shown, the point heating assembly includes two constricted tubes 11 and a square tube 12 connecting the two constricted tubes 11. The cross-sectional area of ​​the flow channel of the square tube 12 is the same as the cross-sectional area of ​​the flow channel at the small end of the constricted tube 11. The bottom surface of the square tube 12 is fixedly connected to several spaced lower cylinders 13 that are connected to the inside of the square tube 12. The lower cylinders 13 are cylindrical, and the cross-sectional area of ​​the opening at the connection between the lower cylinders 13 and the square tubes 12 is smaller than the inner cross-sectional area of ​​the lower cylinders 13. A piston 14 is slidably connected inside the lower cylinders 13 and sealed to its inner circumferential wall. A heating rod 16 is fixedly connected to the bottom surface of the piston 14, penetrating the bottom surface of the lower cylinders 13 to the outside. A sealed space 15 is formed between the piston 14 and the inner bottom surface of the lower cylinders 13. The sealed space 15 is filled with air. Both the piston 14 and the heating rod 16 are made of copper-tungsten alloy.

[0053] like Figure 4As shown, the forming mechanism includes a four-stage frame 19, a two-stage clamping roller assembly 18 mounted on the four-stage frame 19, three sets of two-stage idler roller assemblies 6, and a support frame 20 fixedly connected between the two-stage idler roller assembly 6 and the two-stage clamping roller assembly 18. Several connecting seats 22 are provided along the length of the top surface of the support frame. A connecting frame 23 is rotatably connected to the connecting seat 22. A hydraulic cylinder 24 is rotatably connected to the end of the connecting frame 23 away from the connecting seat 22. The telescopic end of the hydraulic cylinder 24 is fixedly connected to a long, strip-shaped V-shaped blade 30 via a mounting base 29. The V-shaped blade 30 has a cutting edge 31 at the end away from the mounting base 29. A slant frame 21 is fixedly connected to the side wall of the support frame 20. There is an angle between the top surface of the slant frame 21 and the top surface of the support frame 20. A hydraulic cylinder 25 with an upward tilt is fixedly connected to the top surface of the slant frame 21. A hinge seat 26 is fixedly connected to the telescopic end of the hydraulic cylinder 25. A hinge seat 28 is fixedly connected to the end of the hydraulic cylinder 24 away from its rotatable connection with the connecting frame 23. A connecting piece 27 is rotatably connected between the hinge seat 26 and the hinge seat 28.

[0054] like Figure 5 As shown, the stamping mechanism includes a five-stage frame 32, a worktable 33 fixedly connected to the five-stage frame 32, a vertical frame 34 fixedly connected to the top surface of the worktable 33, a top plate 35 fixedly connected to the top surface of the vertical frame 34, and a stamping hydraulic cylinder 36 fixedly connected to the top plate 35. The telescopic end of the stamping hydraulic cylinder 36 passes through the top plate 35 and is vertically downward. A connecting plate 37 is fixedly connected to the telescopic end of the stamping hydraulic cylinder 36. An upper mold 38 is detachably connected to the bottom surface of the connecting plate 37. A lower mold 39 corresponding to the upper mold 38 is detachably connected to the worktable 33. A discharge track 49 is also provided on the five-stage frame 32. The discharge track 49 guides the stamped parts after stamping to fall into the cooling water. A displacement component is also provided on the top plate 35. The displacement component is used to grab the stamped parts and put them into the discharge track 49.

[0055] like Figure 5 As shown, the displacement assembly includes a drive hydraulic cylinder 40 fixedly connected to the top plate 35, a bearing 42 fixedly connected to the top plate 35, a connecting shaft 43 fixedly connected to the inner ring of the bearing 42 and passing through the top plate 35, an eccentric block 44 fixedly connected to the lower end of the connecting shaft 43, an extension rod 45 horizontally fixedly connected to the eccentric block 44, a displacement cylinder 46 fixedly connected to the end of the extension rod 45 away from the eccentric block 44 and vertically arranged, a receiving seat 47 fixedly connected to the telescopic end of the displacement cylinder 46, and a pneumatic finger 48 vertically fixedly connected to the receiving seat 47. A connecting rod 41 is fixedly connected to the upper end of the connecting shaft 43. A groove is opened on the top surface of the end of the connecting rod 41 away from the connecting shaft 43. A cylindrical sliding column is slidably connected in the groove. One end of the sliding column is fixedly connected to the telescopic end of the drive hydraulic cylinder 40.

[0056] The above steps are followed for processing. The uncoiling and flattening step is to press the coiled steel into sheets so that it can be heated, punched, and stamped in the subsequent steps, so that the final stamped part can be kept flat.

[0057] When performing top surface heating, this solution differs significantly from the batch texturing of material sheets in application CN201380027691.8, which states that "sheets can also be cooled or heated before impact to make them softer or otherwise more receptive to texturing operations. For example, soft and tough materials (including materials with a Shore hardness lower than the recommended D55) can be cooled or frozen to apply this treatment method." In this solution, the steel is only locally heated. This point-heating reduces the time required for heating the steel. Furthermore, when heated to 800 degrees Celsius (for example, HT250 gray cast iron), this temperature reaches its quenching temperature. This heating not only facilitates subsequent punching but also allows for quenching in cooling water after punching, ensuring good integrity between the punched spike structure and the back steel, and high connection strength between them.

[0058] Furthermore, during actual heating, the heat exchange area of ​​each point heating position is 2 square centimeters. Since HT250 gray cast iron has a density of 7, a thermal conductivity of 11.5, and a specific heat capacity of 525, the depth of the heating point only needs to be 0.5cm. When the steel at the heating point needs to be heated to 800 degrees Celsius, the heating time is approximately 10 seconds, which allows the top surface of the steel to be quickly heated to the temperature required for punching.

[0059] During heating, the point heating component exchanges heat with external heat sources such as boilers through heat exchanger 7, thereby maintaining the molten salt in the fluid loop formed by heat exchanger 7, primary heat pipe 8, secondary heat pipe 10, point heating component, and tertiary heat pipe 17 at a high temperature of 800 degrees Celsius. The molten salt is then guided to flow through the fluid loop by high-temperature molten salt pump 9. It is important to note that when the point heating component needs to point-heat the top surface of the steel, the high-temperature molten salt pump 9 will increase the flow rate of the molten salt during this process. Since square tube 12 is connected to constricted tube 11, the cross-sectional area of ​​the flow channel of square tube 12 is smaller than that of constricted tube 11. The cross-sectional area of ​​the end flow channel allows the molten salt in a molten state to be pressurized when it enters the square tube 12 through the constriction tube 11. This pressurizes the molten salt and forces it into the lower cylinder 13. The molten salt then compresses the piston 14, which in turn compresses the air in the sealed space 15. This causes the piston 14 to move the heating rod 16 downwards, allowing it to contact the top surface of the steel and achieve point heating of the steel. After heating is complete, the output flow of the high-temperature molten salt pump 9 is reduced, the air is no longer compressed, and the released air pushes the piston 14 and the heating rod 16 upwards, causing the heating rod 16 to detach from the steel.

[0060] Furthermore, during heating, the subsequent stamping mechanism needs to keep the steel pressed, so that the steel at the forming mechanism and the point heating mechanism can be kept taut, so that both can process the steel.

[0061] During the final punching process, the steel at the heating point is easier to cut due to its softening effect. After cutting, the punching mechanism folds the cut steel to form a spike structure. This spike structure is conical, and its cross-sectional area gradually increases from the tip downwards. This operation results in a strong connection between the spike structure on the back steel and the back steel, making it difficult for the spike structure to break. At the same time, the spike structure itself also has good structural strength and is not easily bent when it penetrates the friction material.

[0062] Then, the part with the punched and chiseled protrusion structure is removed from the steel and dropped into the cooling water as a stamping part to complete the quenching action, so that the connection strength between the protrusion structure and the back steel is further improved under the action of quenching.

[0063] Ultimately, the connection between the back steel and the friction material can be completed simply by performing the hot pressing process normally, and the two have good connection strength and are not easy to separate.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A manufacturing process for bicycle brake discs, characterized in that, Includes the following steps, Unwinding and flattening involves unwinding the steel coil and flattening it multiple times through a flattening mechanism in the processing line. The steel is heated from the top surface. After being flattened, the steel is heated by a point heating mechanism in the processing line, forming several sets of heating points on the top surface of the steel. The sets of heating points are spaced apart, and each set of heating points includes several heating points distributed in a rectangular array. The steel located at the heating point is heated to 800°C. After being punched and shaped, the heated steel is transported to the forming mechanism in the processing line. The forming mechanism carries a V-shaped blade (30) and punches it into the top surface of the steel at the heating point at an incline. Then it deflects to be perpendicular to the steel and stays still for 2 seconds, forming a burr structure on the top surface of the steel at the heating point. The stamping guide, the steel with the protruding structure is stamped by the stamping mechanism in the processing line, and the stamped part falls into the cooling water to complete the quenching and discharge, and the rough billet back steel is obtained. Post-processing and output: After the rough back steel is galvanized, it is hot-pressed and assembled with the friction liner, and then output. The point heating mechanism includes a three-stage frame (5), two-stage clamping roller groups (18) set at both ends of the three-stage frame (5) along its length, two sets of two-stage support roller groups (6) set on the top surface of the three-stage frame (5) and located between the two sets of clamping roller groups, a heat exchanger (7) set on one side of the three-stage frame (5), a high-temperature molten salt pump (9) connected to the heat exchanger (7) through a primary heat pipe (8), a secondary heat pipe (10) connected to the outlet of the high-temperature molten salt pump (9), and a point heating element connected to the secondary heat pipe (10) and located above the three-stage frame (5). The component, and the three-stage heat pipe (17) connecting the point heating component and the heat exchanger (7), the heat exchanger (7), the first-stage heat pipe (8), the second-stage heat pipe (10), the point heating component, and the three-stage heat pipe (17) are filled with molten salt in a molten state in the fluid circuit formed by the heat exchanger (7), the first-stage heat pipe (8), the second-stage heat pipe (10), the point heating component is located between two sets of second-stage roller groups (6), the second-stage roller group (6) includes a second-stage roller frame (601) fixedly connected to the third-stage frame (5), and a second-stage roller (602) rotatably connected in the second-stage roller frame (601). The point heating assembly includes two constricted tubes (11) and a square tube (12) connecting the two constricted tubes (11). The cross-sectional area of ​​the flow channel of the square tube (12) is the same as the cross-sectional area of ​​the flow channel at the small end of the constricted tube (11). Several lower cylinders (13) are fixedly connected to the bottom surface of the square tube (12) and are spaced apart and communicate with the inside of the square tube (12). The lower cylinders (13) are cylindrical, and the cross-sectional area of ​​the opening at the connection between the lower cylinders (13) and the square tubes (12) is... The cross-sectional area of ​​the piston (14) is smaller than that of the lower cylinder (13). The piston (14) is slidably connected to the lower cylinder (13) and sealed to its inner peripheral wall. A heating rod (16) is fixedly connected to the bottom surface of the piston (14) and extends through the bottom surface of the lower cylinder (13) to the outside. A sealed space (15) is formed between the piston (14) and the inner bottom surface of the lower cylinder (13). The sealed space (15) is filled with air. Both the piston (14) and the heating rod (16) are made of copper-tungsten alloy.

2. The manufacturing process for a bicycle brake disc according to claim 1, characterized in that, The processing line includes a flattening mechanism, a point heating mechanism, a forming mechanism, and a stamping mechanism arranged in sequence. The flattening mechanism is used to flatten the steel coil. The point heating mechanism is used to heat the top surface of the steel at several points and form several sets of spaced heating points. The forming mechanism is used to punch, bend, and shape the steel at the heating points to form a protruding structure on the top surface of the steel. The stamping mechanism is used to stamp the steel with a single set of heating points and complete the quenching.

3. The manufacturing process for a bicycle brake disc according to claim 2, characterized in that, The flattening mechanism includes a primary frame (1), two side plates (201) fixedly connected to the top surface of the primary frame (1), several primary rollers (202) rotatably connected between the two side plates (201), four sets of primary clamping roller groups (3), and a secondary frame (4). Two sets of the primary clamping roller groups (3) are set on the top surface of the primary frame (1), and the other two sets of the primary clamping roller groups (3) are set on the top surface of the secondary frame (4). The primary clamping roller group (3) includes a primary roller frame (301), a primary lower clamping roller rotatably connected in the primary roller frame (301), a primary slide (303) rotatably sliding in the primary roller frame (301), and a primary upper clamping roller (304) rotatably connected on the primary slide (303) and located above the primary lower clamping roller (302).

4. The manufacturing process for a bicycle brake disc according to claim 2, characterized in that, The forming mechanism includes a four-stage frame (19), a secondary clamping roller group (18) set on the four-stage frame (19), three secondary idler roller groups (6), and a support frame (20) fixedly connected between the secondary idler roller group (6) and the secondary clamping roller group (18). Several connecting seats (22) are provided along the length of the top surface of the support frame. A connecting frame (23) is rotatably connected to each connecting seat (22). A hydraulic cylinder (24) is rotatably connected to one end of the connecting frame (23) away from the connecting seat (22). The telescopic end of the hydraulic cylinder (24) is fixedly connected to a long V-shaped blade (30) via a mounting base (29). The blade (30) has a cutting edge (31) at one end away from the mounting base (29). A slant frame (21) is fixedly connected to the side wall of the support frame (20). There is an angle between the top surface of the slant frame (21) and the top surface of the support frame (20). A hydraulic cylinder two (25) is fixedly connected to the top surface of the slant frame (21) and is inclined upward. A hinge seat one (26) is fixedly connected to the telescopic end of the hydraulic cylinder two (25). A hinge seat two (28) is fixedly connected to one end of the hydraulic cylinder one (24) away from its rotatable connection with the connecting frame (23). A connecting piece (27) is rotatably connected between the hinge seat one (26) and the hinge seat two (28).

5. The manufacturing process for a bicycle brake disc according to claim 2, characterized in that, The stamping mechanism includes a five-stage frame (32), a worktable (33) fixedly connected to the five-stage frame (32), a vertical frame (34) fixedly connected to the top surface of the worktable (33), a top plate (35) fixedly connected to the top surface of the vertical frame (34), and a stamping hydraulic cylinder (36) fixedly connected to the top plate (35). The telescopic end of the stamping hydraulic cylinder (36) passes through the top plate (35) and is vertically downward. The telescopic end of the stamping hydraulic cylinder (36) is fixedly connected to a connecting... The bottom surface of the connecting plate (37) is detachably connected to the upper mold (38), and the worktable (33) is detachably connected to the lower mold (39) corresponding to the upper mold (38). The five-stage frame (32) is also provided with a discharge track (49), which guides the stamped parts after stamping into the cooling water. The top plate (35) is also provided with a displacement component, which is used to grab the stamped parts and put them into the discharge track (49).

6. The manufacturing process for a bicycle brake disc according to claim 5, characterized in that, The displacement assembly includes a drive hydraulic cylinder (40) fixedly connected to the top plate (35), a bearing (42) fixedly connected to the top plate (35), a connecting shaft (43) fixedly connected to the inner ring of the bearing (42) and passing through the top plate (35), an eccentric block (44) fixedly connected to the lower end of the connecting shaft (43), an extension rod (45) fixedly connected horizontally to the eccentric block (44), a displacement cylinder (46) fixedly connected to the end of the extension rod (45) away from the eccentric block (44) and vertically arranged, a receiving seat (47) fixedly connected to the telescopic end of the displacement cylinder (46), and a pneumatic finger (48) fixedly connected to the receiving seat (47). A connecting rod (41) is fixedly connected to the upper end of the connecting shaft (43). A groove is provided on the top surface of the end of the connecting rod (41) away from the connecting shaft (43). A cylindrical sliding column is slidably connected in the groove. One end of the sliding column is fixedly connected to the telescopic end of the drive hydraulic cylinder (40).

Images