Disc wheel manufacturing method adopting layered double-air-inlet process

Abstract

The invention provides a disc wheel manufacturing method of a layered double-air-inlet process. The disc wheel manufacturing method comprises the steps that S1, disc wheel preforms which are integrally formed are manufactured respectively; s2, the disc wheel preformed product is attached to the surface of an air bag set, and the air bag set comprises a first air bag and a second air bag; s3, the air bag set is placed in a mold, and the mold is pressed; s4, gas is introduced into the first gas bag and the second gas bag at the same time, the pressure of the gas introduced into the first gas bag is P1, and the pressure of the gas introduced into the second gas bag is P2; and S5, the mold is subjected to heating shaping, after curing forming, the air bag set is removed, and the finished bicycle disc wheel is manufactured. The layered air inlet process of the first air bag and the second air bag is adopted, different air pressures are adopted for air inlet forming, the rejection rate can be effectively reduced, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The invention relates to a disc wheel manufacturing method using a layered double air intake process, which is applied to the field of wheel rim manufacturing. Background Art

[0002] A bicycle disc wheel, also known as a closed wheel or disc wheel, is a specially designed bicycle rim that is characterized by having both sides of the rim closed to form a disc-like shape. This design is intended to improve the performance of a bicycle at high speeds by reducing air resistance on both sides of the rim.

[0003] The manufacturing methods of disc wheels in the current industry are basically the following: 1. The side cover uses a hard material (PMI, etc.) to support the rigidity of both sides of the disc wheel, and then adopts a single tire groove molding process; 2. The secondary gluing process, first make a wheel rim, then make two side covers, and use the gluing process to make them; the above two processes will have the following problems: (1) The weight will be very heavy; (2) The rigidity is unstable and the strength is poor; (3) The process time is long and the production efficiency is low. In order to solve the above technical deficiencies, we invented a disc wheel manufacturing method with a layered double intake process. Summary of the invention

[0004] The present invention provides a disc wheel manufacturing method using a layered double air intake process, which can effectively solve the above-mentioned problem.

[0005] The present invention is achieved in that:

[0006] A disc wheel manufacturing method using a layered double air intake process, comprising:

[0007] S1: First, prepare the integrated disc wheel preforms;

[0008] S2: attaching the disc wheel preform to the surface of an air bag assembly, wherein the air bag assembly includes a first air bag and a second air bag, wherein the first air bag is used to form a wheel rim body, and the second air bag is used to form a wheel rim side cover;

[0009] S3: placing the air bag assembly in the mold and pressing the mold;

[0010] S4: introducing gas into the first air bag and the second air bag at the same time, the pressure of the gas introduced into the first air bag is P1, and the pressure of the gas introduced into the second air bag is P2;

[0011] S5: The mold is heated and formed, and after solidification, the air bag assembly is removed to form a finished bicycle disc wheel.

[0012] As a further improvement, the relationship between P1 and P2 is P1:P2=V2;KV1, wherein V1 is the volume of the first air bag, V2 is the volume of the second air bag, and K is a constant determined according to different design requirements of the wheel rim body and the side cover.

[0013] As a further improvement, the constant K=2~10.

[0014] As a further improvement, the mold is heated and shaped, the curing temperature is 160-200° C., the curing time is 30-40 minutes, and the heating rate is 7-10° C. / min.

[0015] As a further improvement, the disc wheel preform is made of carbon fiber composite material.

[0016] As a further improvement, the carbon fiber composite material consists of polycarbonate resin, polyoxymethylene resin, carbon fiber, a compatibilizer, a lubricant and a light stabilizer.

[0017] As a further improvement, the disc wheel preform includes a wheel rim body, reinforced side covers on both sides, and a hub mounting seat.

[0018] As a further improvement, a plurality of reinforcing ribs in an annular array equidistant along the diameter direction of the mounting hole are arranged on the inner wall surface of the reinforced side cover, and the width of the reinforcing ribs gradually increases along the direction from the mounting hole to the wheel rim.

[0019] As a further improvement, the inner wall surface of the reinforced side cover is provided with reinforcing ribs, and the reinforcing ribs are designed with a honeycomb structure.

[0020] As a further improvement, PU material is attached to both sides of the second air bag, and a side cover preform of the carbon composite material is arranged on both sides of the PU material. The second air bag is placed in the mold, and uniform gas pressure is provided by the second air bag to heat the inside of the mold.

[0021] The beneficial effects of the present invention are as follows: the present invention utilizes the characteristics of carbon cloth heating and molding to prepare disc wheels, and does not require the use of a gluing process, thereby shortening the process time, simplifying the product manufacturing process, and improving production efficiency. At the same time, the disc wheel has more stable structural rigidity, high strength, and light weight. The first air bag and the second air bag layered air intake process are adopted, and different gas pressures are used for air intake molding, which can effectively reduce the scrap rate and reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a double-layer air intake process flow chart provided in an embodiment of the present invention.

[0024] Figure 2 It is a structural schematic diagram provided by an embodiment of the present invention.

[0025] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle.

[0026] Figure 4 It is a schematic diagram of the disc wheel side cover reinforcement rib provided by an embodiment of the present invention.

[0027] Figure 5 It is a schematic diagram of the honeycomb reinforcement ribs of the disc wheel side cover provided in an embodiment of the present invention.

[0028] The accompanying drawings are marked as follows:

[0029] 10. Disc wheel preform;

[0030] 20. air bag group; 21. first air bag; 22. second air bag;

[0031] 30. mold; 31. upper mold; 32. lower mold;

[0032] 40. Disc wheel; 41. Reinforcement ribs. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] Reference Figures 1 to 3 As shown, a method for manufacturing a disc wheel 40 using a layered dual-intake process includes the following steps:

[0036] S1: First, an integrally formed disc wheel preform 10 is manufactured respectively, wherein the disc wheel preform 10 comprises a wheel rim body, two side reinforced side covers, and a hub mounting seat. In this embodiment, the disc wheel preform 10 is made of a carbon fiber composite material;

[0037] S2: attaching the disc wheel preform 10 to the surface of the air bag group 20, the air bag group 20 includes a first air bag 21 and a second air bag 22, the first air bag 21 and the second air bag 22 both include a bag body and an air nozzle connecting the bag bodies. In this embodiment, the first air bag 21 is a wheel rim main body air bag, and the second air bag 22 is a wheel rim side cover air bag, so that the wheel rim main body preform is attached to the wheel rim main body air bag, the reinforced side cover preforms on both sides are attached to the surface of the wheel rim side cover air bag, and the hub mounting seat is arranged in the middle of the wheel rim side cover air bag. In this embodiment, the first air bag 21 and the second air bag 22 are both latex air bags. If ordinary air bags are used, on the one hand, ordinary air bags may be damaged during the inflation process, resulting in the scrapping of the wheel rim manufacturing, and on the other hand, ordinary air bags may have the problem of uneven pressure. In other embodiments, the first air bag 21 adopts an ordinary air bag, and the second air bag 22 adopts a latex air bag. Because the curve requirements of the wheel rim main body are not high relative to the side cover, and its space is small, the use of ordinary air bags effectively reduces costs;

[0038] S3: placing the airbag assembly 20 in the mold 30, and pressing the mold 30; the mold 30 comprises an upper mold 31, a lower mold 32, and a mold core arranged between the upper mold 31 and the lower mold 32, the mold core comprises a plurality of arc-shaped assembly blocks connected end to end, the arc-shaped assembly block is provided with a first bolt hole, the lower mold 32 is provided with a second bolt hole, the first bolt hole and the second bolt hole are fixed by bolts, a positioning block is provided on the side of the arc-shaped assembly block away from the first bolt hole, the upper mold 31 is provided with a positioning groove, the positioning block is arranged in the positioning groove, so that the arc-shaped assembly block is fixed relative to the upper mold 31 and the lower mold 32 to prevent it from rotating, the arc-shaped assembly block is provided with a through hole, the air nozzle is arranged in the through hole, so that the air nozzle is exposed outside the mold 30, the mold 30 is pressed by using a pressing device, and the air nozzle is connected to an external air source;

[0039] S4: Gas is introduced into the first air bag 21 and the second air bag 22 at the same time. The gas pressure introduced into the first air bag 21 is , and the gas pressure introduced into the second air bag 22 is . Under the expansion of the air bag group 20, the preform of the disc wheel 40 is fully attached to the inner surface of the mold. In this embodiment, the relationship between P1 and P2 is P1: P2 = V2; KV1, wherein the volume of the first air bag 21 is V1, and the volume of the second air bag 22 is V2. K is a constant determined according to different design concepts of the wheel rim body and the side cover. According to the gas pressure formula, PV = nRT, wherein n is the number of moles of gas, R is the ideal gas constant, P is pressure, V is volume, and T is temperature. Therefore, Under normal circumstances, the temperature T in the first air bag 21 and the second air bag 22 are consistent, the molar number n, and the ideal gas constant R are consistent, so P1:P2=V2;V1, but due to the different design concepts of the wheel rim body and the side cover, the constant K needs to be increased. In this embodiment, K=2~10.

[0040] S5: The mold 30 is heated and formed, the curing temperature is 160-200° C., the curing time is 30-40 min, and the heating rate is 7-10° C. / min. After curing and forming, the mold 30 is disassembled, and the air bag assembly 20 is removed to manufacture a finished bicycle disc wheel 40.

[0041] Compared with the traditional method of manufacturing the disc wheel 40, the advantage of the present invention is that the present invention utilizes the heat-forming characteristics of carbon cloth to prepare the disc wheel 40, and does not require the use of a gluing process, shortens the process time, simplifies the product manufacturing process, and improves production efficiency. At the same time, the disc wheel 40 has more stable structural rigidity, high strength, and light weight, and adopts a layered air intake process of the first air bag 21 and the second air bag 22 to reduce the scrap rate and reduce manufacturing costs.

[0042] In a specific implementation case of the present invention, we use a specific carbon fiber composite material to manufacture a preform of a disc wheel 40. This composite material consists of the following components: 60 parts of polycarbonate resin, 25 parts of polyoxymethylene resin, 7 parts of carbon fiber, 5 parts of compatibilizer, 1 part of lubricant and 2 parts of light stabilizer. During the preparation process, the polycarbonate resin and polyoxymethylene resin are first dried at 100°C for 5 hours, and then the carbon fiber is impregnated with epoxy resin and cured for 5 hours, and diethyltoluenediamine is selected as the curing agent. Next, according to a precise ratio, the polycarbonate resin, polyoxymethylene resin, carbon fiber, compatibilizer, lubricant and light stabilizer are put into a premixer for mixing. After the mixture is mixed, melted and homogenized, it is granulated by an extruder to form carbon fiber composite material particles. Finally, these particles are processed into the shape of the disc wheel preform 10 to prepare for the subsequent molding steps.

[0043] The present invention performs performance tests on the carbon fiber composite material for many times, and the test method is as follows:

[0044] 1. Tensile strength: Prepare standard size specimens according to international standards (such as ISO, ASTM, etc.), use a universal material testing machine to perform tensile tests, and record the stress-strain curve of the specimen during the tensile process until it breaks; test conditions: tensile rate 10mm / min, temperature 23℃.

[0045] 2. Impact strength: According to ISO180-2000 standard, the cantilever beam notch impact test was performed on the products of the embodiment and the comparative example. The sample was fixed on the test device, and then a hammer of a certain mass was dropped from a preset height to impact the sample. The impact resistance was evaluated by measuring the degree of damage of the sample after impact. The weight of the hammer was 100N.

[0046] 3. Scratch resistance: Use a cross scratch tester to test the injection molded sample, with a scratch load of 10N. The scratch resistance of the material is judged based on the color difference ΔL before and after the scratch. The lower the ΔL value, the harder it is to find the scratch, and the better the scratch resistance. For scratch-resistant materials, the ΔL value before and after the scratch is usually required to be less than 1.

[0047] In this embodiment, the carbon fiber composite material was tested 10 times, and the results are shown in the following table:

[0048] Table 1 Carbon fiber composite material performance test data

[0049]

[0050]

[0051] According to the data in Table 1, the average tensile strength (MPa) of the carbon fiber composite material after 10 tests is 109 MPa, the average impact strength is 35.4 KJ / m2, and the scratch resistance ΔL is 0.48 mm.

[0052] Since the design concepts of the rim body and the side cover of the bicycle disc wheel 40 are different, the required molding pressures are different. On the one hand, the rim body is the main load-bearing part of the bicycle wheel and requires higher strength and rigidity, so higher pressure is required to ensure that the material is fully solidified and the structure is intact. The main function of the side cover is to provide aerodynamic advantages, and its structural strength requirement is not as high as that of the rim, so lower pressure may be required, and the material thickness, number of layers, and fiber direction of the rim body and the side cover are different, so the required molding pressures are different. On the other hand, using a higher molding pressure will make the air bag more easily damaged during the inflation process, and after the bicycle disc wheel 40 is formed, the air bag will adhere to the inner wall of the bicycle disc wheel 40. When the pressure of the air bag is high, it is more difficult to extract the air bag from the inner cavity of the bicycle disc wheel 40, especially the side cover part of the disc wheel 40, where the area of ​​the air bag adhesion is larger, resulting in higher difficulty in extraction and higher labor costs. If the air bag is damaged, it needs to be replaced with a new air bag, and the customization cost of latex air bags is higher. Therefore, if the air bag can be recycled, a lot of costs will be saved. If the molding pressure of the side cover is insufficient, the molding shape of the side cover will be unstable and uniform pressure cannot be provided, resulting in poor overall strength and consistency of the wheel rim side cover. Therefore, how much molding pressure is needed is the key to the design of the disc wheel 40 of the present invention.

[0053] Next, the scientificity of the setting of the molding pressure of the disc wheel 40 in the present invention prepared by the dual air intake method is verified by experiment. The following is a comparative performance analysis experiment of the disc wheel 40. Both the rim body and the side cover are made by using a general rim molding gas pressure of 0.5MPa. The material at 10 equal intervals on the rim body and the side cover is tested. The other conditions are the same as the performance test of the carbon fiber composite material. The strength data of the rim manufactured according to the molding gas pressure is shown in Table 2 below:

[0054] Table 2 Comparative Example 1 Disc Wheel Performance Test Data

[0055]

[0056]

[0057] The following is the comparative experimental data of Example 1. The ratio of the cavity volume of the wheel rim body to the cavity volume of the side cover is V2:V1=50:1, which is also the ratio of the cavity volume of the first air bag 21 to the second air bag 22. Then, according to the molding pressure formula of the first air bag 21 and the second air bag 22, P1:P2=V2; KV1: it can be obtained: In this embodiment, P1 selects the gas pressure commonly used for general wheel rim molding, 0.5 MPa, and the constant K=10, then the molding pressure required for the second air bag is P2=0.1 MPa, and the other molding conditions are exactly the same as those in Comparative Example 1. The strength of the wheel rim manufactured according to the molding gas pressure is shown in Table 3 below:

[0058] Table 3 Performance test data of disc wheel in Example 1

[0059]

[0060]

[0061] The following is the comparative experimental data of Example 2. The ratio of the cavity volume of the wheel rim body to the cavity volume of the side cover is V2:V1=50:1, which is also the ratio of the cavity volume of the first air bag 21 to the second air bag 22. Then, according to the molding pressure formula of the first air bag 21 and the second air bag 22, P1:P2=V2; KV1: it can be obtained that: In this embodiment, P1 selects the gas pressure commonly used for general wheel rim molding, 0.5 MPa, and the constant K=2, so the molding pressure P2 required for the second air bag 22 is 0.2 MPa, and the other molding conditions are exactly the same as those in Comparative Example 1. The strength of the wheel rim manufactured according to the molding gas pressure is shown in Table 4 below:

[0062] Table 4 Performance test data of disc wheel in Example 2

[0063]

[0064]

[0065] According to the data analysis of Tables 1 to 4, whether it is Comparative Example 1 or Examples 1 and 2, the tensile strength, impact strength, and scratch resistance test structures of the rim body are similar to the carbon fiber composite material performance test, and the standard deviations between the rim body and the side cover at different positions are not much different. Since the side cover part has a large area and is relatively thin, the performance of the side cover part is weaker than the carbon fiber composite material performance test. However, according to the comparative analysis of Tables 2 to 4, the tensile strength of the side covers of Examples 1 and 2 is similar to the average values ​​of impact strength and scratch resistance, but the standard deviation of the tensile strength of the side cover of Comparative Example 1 is 4.45, the standard deviation of the tensile strength of the side cover of Example 1 is 2.79, and the standard deviation of the tensile strength of the side cover of Example 2 is 3.7, the standard deviation of the impact strength of the side cover of Example 1 is 1.48, the standard deviation of the tensile strength of the side cover of Example 1 is 0.58, and the standard deviation of the tensile strength of the side cover of Example 2 is 0.66, which means that in terms of tensile strength and impact strength, Examples 1 and 2 are obviously more stable, and the scratch resistance is similar, which means that according to the molding pressure setting of this embodiment, the strength stability of the side cover is obviously better than that of Example 1, and since the appropriate gas pressure setting is not selected for Example 1, the demolding efficiency is obviously worse, and the air bag is damaged. Therefore, it can be concluded from this experiment that selecting an appropriate molding pressure can effectively improve the strength stability of the side cover, and it is easy to demold after manufacturing to prevent the latex air bag from being damaged.

[0066] Reference Figures 4-5 As shown, in another embodiment, it is necessary to make a side cover provided with a plurality of reinforcing ribs 41 in an equidistant annular array along the diameter direction of the mounting hole, and the reinforcing ribs 41 abut against the inner wall surface of the wheel rim. This structure can effectively increase the strength of the wheel rim side cover. In another embodiment, the width of the reinforcing ribs 41 gradually increases along the direction from the mounting hole to the wheel rim. On the one hand, the structural strength of the outer peripheral surface of the side cover body can be enhanced by the reinforcing ribs 41 with gradually varying widths, and the weight can be effectively reduced relative to the reinforcing ribs 41 with equal widths. The structure is simple and practical. On the other hand, during the manufacturing process, the reinforcing ribs 41 with gradually varying widths abut against the inner wall surface of the wheel rim, effectively expanding the area of ​​the reinforcing ribs 41 on the inner wall of the wheel rim, so that the structure of the wheel rim is more stable during riding. In another embodiment, the reinforcing ribs 41 of the side cover are designed with a honeycomb structure, which can also effectively increase the strength of the side cover.

[0067] The manufacture of this structure is relatively complicated and cannot be directly formed by ordinary air bags, especially the groove parts between adjacent reinforcing ribs 41. If ordinary air bags are used, these groove parts may not be formed. Usually, this situation requires customized latex air bags of specific shapes to be inflated and formed, but customized latex air bags are expensive and can only be used a limited number of times. Therefore, in order to consider the cost issue, in one embodiment, the air bag molding technology is still used, but for the reinforcing rib 41 structure or the honeycomb structure, this embodiment uses customized PU (polyurethane) material for molding. The PU material is attached to the two sides of the second air bag 22, and the side cover preform of the carbon composite material is arranged on both sides of the PU material. The second air bag 22 provides uniform gas pressure, and the inside of the mold 30 is heated, so that the carbon composite material forms a side cover structure with the shape of the PU material. The reinforcing rib 41 structure or the honeycomb structure obtained by this method has a lower cost than customized latex air bags. Since the PU material is a high temperature resistant material and has a certain toughness, it is easier to demold than latex air bag molding.

[0068] However, the molding pressure of the second air bag 22 needs to be precisely controlled. Since the second air bag 22 has a certain toughness, excessive molding pressure may cause the reinforcing rib 41 to deform, while too low molding pressure may cause the second air bag 22 to be unable to provide uniform pressure, resulting in stress concentration problems on the side cover of the disc wheel 40.

[0069] Therefore, the scientificity of the molding pressure setting of the disc wheel 40 prepared by the dual air intake process is verified by experiments. The following is a comparative performance analysis experiment of the disc wheel 40. Both the rim body and the side cover adopt a general rim molding gas pressure of 0.5MPa. The other conditions are the same as the carbon fiber composite material performance test. The strength of the rim manufactured according to the molding gas pressure is shown in Table 5 below:

[0070] Table 5 Comparative Example 2 Disc Wheel Performance Test Data

[0071]

[0072]

[0073] The following is comparative experimental data of Example 3. The ratio of the cavity volume of the wheel rim body to the cavity volume of the side cover is V2:V1=50:1, which is also the ratio of the cavity volume of the first air bag 21 to the second air bag 22. Then, according to the molding pressure formula of the first air bag 21 and the second air bag 22, P1:P2=V2; KV1: it can be obtained that: In this embodiment, P1 selects the gas pressure commonly used for general wheel rim molding, 0.5 MPa, and the constant K=10, then the molding pressure required for the second air bag 22 is P2=0.1 MPa, and the other conditions are the same as those in Comparative Example 2. The strength of the wheel rim manufactured according to the molding gas pressure is shown in Table 6 below:

[0074] Table 6 Performance test data of disc wheel in Example 3

[0075]

[0076]

[0077] The following is comparative experimental data of Example 4. The ratio of the cavity volume of the wheel rim body to the cavity volume of the side cover is V2:V1=50:1, which is also the ratio of the cavity volume of the first air bag 21 to the second air bag 22. Then, according to the molding pressure formula of the first air bag 21 and the second air bag 22, P1:P2=V2; KV1: it can be obtained that: In this embodiment, P1 selects the gas pressure commonly used for general wheel rim molding, 0.5 MPa, and the constant K=2, so the molding pressure required for the second air bag 22 is P2=0.2 MPa, and the other conditions are the same as those in Comparative Example 2. The strength of the wheel rim manufactured according to the molding gas pressure is shown in Table 7 below:

[0078] Table 7 Performance test data of disc wheel in Example 4

[0079]

[0080]

[0081] According to the data analysis of Tables 5 to 7, the tensile strength of the side covers of Comparative Example 2 and Examples 3 and 4 are similar in terms of the average values ​​of impact strength and scratch resistance, but the standard deviation of the tensile strength of the side covers of Comparative Example 2 is 7.30, the standard deviation of the tensile strength of the side covers of Example 3 is 5.16, and the standard deviation of the tensile strength of the side covers of Example 4 is 4.96. The standard deviation of the impact strength of the side covers of Comparative Example 1 is 1.41, the standard deviation of the tensile strength of the side covers of Example 3 is 1.10, and the standard deviation of the tensile strength of the side covers of Example 2 is 0.95, indicating that in terms of tensile strength and impact strength, Examples 3 and 4 are obviously more stable, and the scratch resistance is similar, indicating that according to the molding pressure setting of this embodiment, the strength stability of the side cover is obviously better than that of Comparative Example 2, and since Comparative Example 2 does not select a suitable gas pressure setting, the demolding efficiency is obviously worse, and damage to the air bag also occurs. Therefore, through this experiment, it can be obtained that selecting a suitable molding pressure can effectively improve the strength stability of the side cover, and it is easy to demold after manufacturing to prevent the latex air bag from being damaged.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A disc wheel manufacturing method using a layered double air intake process, characterized in that: include: S1: First, a disc wheel preform (10) is produced in one piece; S2: attaching the disc wheel preform (10) to the surface of an air bag assembly (20), wherein the air bag assembly (20) comprises a first air bag (21) and a second air bag (22), wherein the first air bag (21) is used to form a wheel rim body, and the second air bag (22) is used to form a wheel rim side cover; S3: placing the air bag assembly (20) in the mold (30), and pressing the mold (30); S4: simultaneously introducing gas into the first air bag (21) and the second air bag (22), wherein the pressure of the gas introduced into the first air bag (21) is P1, and the pressure of the gas introduced into the second air bag (22) is P2; S5: The mold (30) is heated and shaped, and after solidification, the air bag assembly (20) is removed to form a finished bicycle disc wheel (40).

2. The disc wheel manufacturing method of the layered double air intake process according to claim 1 is characterized in that: The relationship between P1 and P2 is P1:P2=V2;KV1, wherein V1 is the volume of the first air bag, V2 is the volume of the second air bag, and K is a constant determined according to different design requirements of the wheel rim body and the side cover.

3. The method for manufacturing a disc wheel using a layered dual-intake process according to claim 2, characterized in that: Constant K=2~10.

4. The method for manufacturing a disc wheel using a layered dual-intake process according to claim 1, characterized in that: The curing temperature of the mold heating and shaping is 160-200°C, the curing time is 30-40min, and the heating rate is 7-10°C / min.

5. The method for manufacturing a disc wheel using a layered dual-intake process according to claim 1, characterized in that: The disc wheel preform is made of carbon fiber composite material.

6. The method for manufacturing a disc wheel using a layered dual-intake process according to claim 5, characterized in that: The carbon fiber composite material consists of polycarbonate resin, polyoxymethylene resin, carbon fiber, a compatibilizer, a lubricant and a light stabilizer.

7. The method for manufacturing a disc wheel using a layered dual-intake process according to claim 1, characterized in that: The disc wheel preform (10) comprises a wheel rim body, reinforced side covers on both sides, and a hub mounting seat; the first air bag (21) is a wheel rim body air bag, and the second air bag (22) is a wheel rim side cover air bag.

8. The method for manufacturing a disc wheel using a layered dual-intake process according to claim 7, characterized in that: A plurality of reinforcing ribs (41) are arranged on the inner wall surface of the reinforced side cover in an annular array equidistant along the diameter direction of the mounting hole, and the width of the reinforcing ribs (41) gradually increases along the direction from the mounting hole to the wheel rim.

9. The method for manufacturing a disc wheel using a layered dual-intake process according to claim 7, characterized in that: The inner wall surface of the reinforced side cover is provided with reinforcing ribs (41), and the reinforcing ribs (41) are designed in a honeycomb structure.

10. The method for manufacturing a disc wheel using a layered dual-intake process according to claim 7, characterized in that: PU material is attached to both sides of the second air bag (22), a side cover preform of the carbon composite material is arranged on both sides of the PU material, and the second air bag (22) is placed in the mold (30), and a uniform gas pressure is provided by the second air bag (22), and the inside of the mold (30) is heated.

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