A carbon fiber spoke and a manufacturing process thereof

Abstract

The application discloses a carbon fiber spoke and a manufacturing process thereof, and relates to a carbon fiber spoke, a cap head, a tooth cap and a manufacturing process thereof. The carbon fiber spoke core shaft is thick in the middle and thin at both ends, the carbon spoke adopts an inner embedding and secondary gluing and wrapping process or a carbon core shaft inner embedding one-time forming process, the carbon fiber spoke is more solid and stable, the internal structures of the cap head and the tooth cap adopt a stepped reverse design opposite to the carbon fiber spoke, the cap head and the tooth cap inner diameter gradually increases away from the carbon fiber spoke side through the secondary gluing and wrapping process, the installation is more stable and convenient, the stepped reverse design of the carbon fiber spoke can improve the adhesion between the metal part and the carbon fiber, the service life is prolonged during use, and the manufacturing process of the carbon fiber spoke is adopted, so that the formed part can fully fit the mold and reach the required shape and size, and the formed part is fully solidified and hardened, so that the formed part has sufficient strength and rigidity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon fiber spokes, and more particularly to a carbon fiber spoke and a manufacturing process thereof. BACKGROUND

[0002] The carbon fiber spoke is a light-weight, high-strength and high-rigidity spoke, which is suitable for supporting the hub of various bicycles.

[0003] The manufacturing method of the carbon spoke in the current industry is basically to first form the carbon spoke body, and then use secondary bonding technology or the current one-step forming technology. However, the manufacturing technology of the two types has defects in the strength of the carbon spoke, especially the strength of the joint between the two metal parts. During cycling, the fatigue strength of the spoke decreases, causing the metal parts to fall off.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a carbon fiber spoke and a manufacturing process thereof. SUMMARY

[0005] The present application aims to provide a carbon fiber spoke and a manufacturing process thereof to solve the above problems.

[0006] To achieve the above-mentioned purpose, the technical solution provided by an embodiment of the present application is as follows:

[0007] A carbon fiber spoke, comprising: a carbon fiber spoke, a cap and a dental cap, the carbon fiber spoke is provided with a cap and a dental cap at both ends respectively; the cap is arranged at one end of the carbon fiber spoke, and the carbon fiber spoke is embedded into the cap; the dental cap is arranged at the other end of the carbon fiber spoke, and the carbon fiber spoke is embedded into the dental cap away from the cap.

[0008] As a further improvement of the present application, the carbon fiber spoke adopts a stepped (single step or multi-step) reverse design, and the carbon fiber spoke core shaft has a shape of thick in the middle and thin at both ends. The internal structure of the cap and the dental cap both adopts a stepped (single step or multi-step) reverse design opposite to the carbon fiber spoke, and the inner diameter of the cap and the dental cap gradually increases along the opposite side of the carbon fiber spoke.

[0009] A manufacturing process of a carbon fiber spoke, comprising the following steps:

[0010] S1: material selection and pretreatment: high-strength carbon fiber is selected as the raw material, and the number of layers of the carbon fiber in the 0-degree direction and the arrangement mode in the angle direction are determined according to the specifications of the carbon spoke, and the carbon fiber is rolled and rounded by hand or machine;

[0011] S2: mold forming: the carbon spoke body is formed by a carbon spoke mold, heated and formed, and the length is taken according to the actual length specifications, and the two ends of the carbon spoke are processed and ground;

[0012] S3: metal piece is sleeved into: the metal piece is sleeved into the carbon spoke main body in the direction of the spoke;

[0013] S4: high-performance adhesive sheet glue and carbon cloth are attached: after the metal piece is sleeved in, the high-performance adhesive sheet glue and carbon cloth are wound on both ends of the carbon spoke main body, and the metal piece is pulled to the position by artificial rolling, and the thermosetting shape memory polymer is added between the sheet glue and the carbon cloth;

[0014] S5: high-performance adhesive sheet glue and carbon cloth are attached again: the high-performance adhesive sheet glue and carbon cloth are attached again at the lower end of the metal piece and the carbon spoke connection according to the specified specification, and the thermosetting shape memory polymer is added between the sheet glue and the carbon cloth.

[0015] S6: forming: the rolled carbon spoke is placed in the corresponding forming mold, and is heated and formed to obtain a carbon fiber spoke.

[0016] S7: a corrosion-resistant coating is sprayed on the surface of the carbon fiber spoke, and is dried to obtain a finished product.

[0017] As a further improvement of the application, when the high-strength carbon fiber is selected as the raw material in S1, it needs to be heated appropriately, the heating temperature is set to 25-30℃, and the heating time is set to 1-2min.

[0018] As a further improvement of the application, the temperature of S2 is set to 145-155℃, the forming time is set to 15-25min, and the cooling time is set to 8-12min.

[0019] As a further improvement of the application, in S3, the metal piece is sleeved into the carbon fiber spoke main body by coating high-performance AB agent on the carbon spoke glue joint or reducing the sleeving speed.

[0020] As a further improvement of the application, in S4, the high-performance adhesive sheet glue and carbon cloth are attached to both ends of the carbon spoke main body, and uniform distribution and close winding are ensured.

[0021] As a further improvement of the application, in S5, the high-performance adhesive sheet glue and carbon cloth are attached again, and the position and method of the first winding are matched, and the thermosetting shape memory polymer in S4 and S5 includes any one or more of cross-linked PE, cross-linked (ethylene / vinyl acetate) copolymer and trans-polyisoprene.

[0022] As a further improvement of the application, in S6, the heating forming temperature is set to 145-155℃, the forming time is set to 10-20min, and the cooling time is set to 5-10min.

[0023] Compared with the prior art, the present application has the advantages of:

[0024] The carbon fiber spoke core shaft is thick in the middle and thin at both ends, making the carbon fiber spoke more solid and stable. The internal structure of the cap and the dental cap adopts a stepped (single or multi-step) reverse design opposite to the carbon fiber spoke, which can make the cap and the dental cap more tightly fixed on the carbon fiber spoke, improve its stability and reliability, and the cap and the dental cap inner diameter gradually increases away from the carbon fiber spoke side, which is more stable and convenient to install. The stepped (single or multi-step) reverse design of the carbon fiber spoke can improve the adhesion between the metal parts and the carbon fiber, making the carbon fiber spoke more stable when connecting the cap and the dental cap, improving its strength, thereby prolonging its service life when in use. The manufacturing process of the carbon fiber spoke is adopted to ensure that the formed part can fully fit the mold and meet the required shape and size. Sufficient heating forming temperature and time can make the thermosetting shape memory polymer fully recover to the original state, so that the carbon fiber and the metal part are more tightly fitted. Sufficient cooling time can ensure that the formed part is fully solidified and hardened, thereby having sufficient strength and rigidity. In addition, when the metal parts at both ends of the carbon fiber spoke are loose due to long-term use, they can be repaired by external heating means to prolong the service life. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The carbon fiber spoke structure of the present application is shown in the figure;

[0026] Figure 2 The cap head structure of the present application is shown in the figure;

[0027] Figure 3 The dental cap structure of the present application is shown in the figure;

[0028] Figure 4 The carbon fiber spoke cross-sectional structure of the present application is shown in the figure;

[0029] Figure 5 The manufacturing process flow chart of the carbon fiber spoke of the present application is shown in the figure.

[0030] Explanation of figure numbers:

[0031] 1. Carbon fiber spoke; 2. Cap; 3. Dental cap. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0033] Please refer to Figures 1-4A carbon fiber spoke, comprising: a carbon fiber spoke 1, a cap head 2 and a cap 3, the carbon fiber spoke 1 is provided with a cap head 2 and a cap 3 at both ends respectively; the cap head 2 is arranged at one end of the carbon fiber spoke 1, and the carbon fiber spoke 1 is embedded into the cap head 2; the cap 3 is arranged at the other end of the carbon fiber spoke 1, and the carbon fiber spoke 1 is embedded into the cap 3 away from the cap head 2.

[0034] The carbon fiber spoke 1 adopts a stepped (single step or multi-step) reverse design, and the carbon fiber spoke shaft is in the form of thick in the middle and thin at both ends, the internal structure of the cap head 2 and the cap 3 adopts a stepped reverse design opposite to the carbon fiber spoke 1, and the inner diameter of the cap head 2 and the cap 3 gradually increases along the opposite side of the carbon fiber spoke 1.

[0035] Wherein, by embedding the carbon fiber spoke 1 into the cap head 2 and the cap 3 at both ends respectively, and by the form of thick in the middle and thin at both ends of the carbon fiber spoke 1, the carbon fiber spoke 1 is more solid and stable, and also meets the requirement of heat dissipation, and the internal structure of the cap head 2 and the cap 3 adopts a stepped reverse design opposite to the carbon fiber spoke 1, which can make the cap head 2 and the cap 3 more tightly fixed on the carbon fiber spoke 1, improve its stability and reliability, and the inner diameter of the cap head 2 and the cap 3 gradually increases away from the carbon fiber spoke 1 side, which is more stable and convenient to install, the stepped (single step or multi-step) reverse design of the carbon fiber spoke 1 can improve the adhesion between the metal part and the carbon fiber, so that the carbon fiber spoke 1 can be more stable when connecting the cap head 2 and the cap 3, improve its strength, thereby prolonging its service life when in use.

[0036] Please refer to Figure 5 A manufacturing process of a carbon fiber spoke, comprising the following steps:

[0037] S1: material selection and pretreatment: selecting high-strength carbon fiber as raw material, determining the number of layers of carbon fiber in 0 degree direction and the arrangement mode in angle direction according to the specification of carbon spoke, and rolling by hand or machine;

[0038] S2: mold forming: forming the carbon spoke main body through carbon spoke mold, heating and forming, and taking the length according to the actual length specification, and processing the two ends of the carbon spoke;

[0039] S3: metal part sleeving: the metal part is sleeved into the carbon spoke main body in the direction of the spoke;

[0040] S4: bonding high-performance adhesive sheet and carbon cloth: after sleeving the metal part, bonding high-performance adhesive sheet and carbon cloth on both ends of the carbon spoke main body, and then rolling by hand, the metal part is pulled tightly to the position, wherein, the thermosetting shape memory polymer is added between the adhesive sheet and the carbon cloth;

[0041] S5: Secondary bonding of high performance adhesive sheet and carbon cloth: at the lower end of the metal piece and the carbon spoke connection, the high performance adhesive sheet and carbon cloth are bonded again according to the specified specifications, and are manually rolled to be compact, wherein a thermosetting shape memory polymer is added between the sheet and the carbon cloth;

[0042] S6: Forming: the carbon spoke after rolling is placed in the corresponding forming mold, and is heated to be formed, to obtain a carbon fiber spoke;

[0043] S7: Spraying a corrosion-resistant coating on the surface of the carbon fiber spoke, and drying, to obtain a finished product.

[0044] Further, the preparation raw materials of the corrosion-resistant coating include, by weight parts: 30 parts of epoxy emulsion, 15 parts of silicone resin, 10 parts of filler, 1 part of preservative, 0.6 parts of defoaming agent, and 30 parts of dipropylene glycol butyl ether.

[0045] The epoxy emulsion is a multi-component epoxy high molecular polymer emulsion, which is purchased from Beijing Meiyang Times Science and Trade Co., Ltd., and the model number is WR-2253, the viscosity at 25℃ is 800-2500 mPa.s, and the epoxy equivalent weight is 200-800 g / eq;

[0046] The silicone resin is purchased from Laizhang Shengbang Silicone Technology Co., Ltd., and the model number is SI-MQ204, the viscosity at 25℃ is 500-3000 mPa.s;

[0047] The filler is rutile titanium dioxide and low-melting glass powder with a mass ratio of 5:1; the rutile titanium dioxide has a particle size of 30 nm, which is purchased from Ningbo Juxiwei New Material Technology Co., Ltd., and the low-melting glass powder has a D50 of 1-30 μm, which is purchased from Donghai County Jingshengyuan Silicon Micropowder Co., Ltd.;

[0048] The preservative is Kathon LXE of Kathon;

[0049] The defoaming agent is TEGO 902W product of TEGO;

[0050] Further, the preparation method of the corrosion-resistant coating includes: obtaining the preparation raw materials according to the required weight parts, adding them to a mixing container, stirring them to be uniform, spraying them to the surface of the carbon fiber spoke, coating a thickness of 5-15 μm, and drying, to obtain the corrosion-resistant coating.

[0051] The applicant found that by selecting a specific parameter of the epoxy resin and the silicone resin, the corrosion resistance of the coating is effectively improved, and the wear resistance of the coating is greatly improved. The applicant believes that when the weight ratio of the epoxy resin and the silicone resin is 2:1, effective adhesion and crosslinking reaction can be carried out in the overall system, so that the two can have excellent entanglement effect, and the combination of specific viscosity and epoxy value can greatly improve the high adhesion of the system while forming a fixed and stable crosslinking system, which can maintain a stable uniform system during use, thereby realizing wear resistance and corrosion resistance.

[0052] In addition, the applicant also found that when the mass ratio of rutile titanium dioxide and low-melting glass powder is 5:1, the wear resistance of the coating is good, and the dispersion effect of the filler in the system is very uniform. The possible reason is that the specific particle size of the filler can produce good compatibility with the compounded resin, the internal force of the system is uniform, the stability of the coating is better, and the stable and durable corrosion resistance and wear resistance are achieved.

[0053] The main body of the carbon fiber material is designed with reverse buckling with the metal part, which can realize the close cooperation of the carbon fiber reinforced material and the metal part, thereby improving the overall strength and stability. Usually, secondary molding or one-step molding of the two-end stepped structure is required, and the metal part is embedded in the corresponding design cavity.

[0054] The metal part can adopt any one of the full-pass reverse buckling design or the half-pass reverse buckling design. The metal part is reversely buckled in the interior of the carbon fiber reinforced material main body, which can make the metal part perfectly fit with the carbon fiber reinforced material main body, thereby improving the overall strength and stability. The half-pass reverse buckling design means that the metal part only penetrates part of the carbon fiber reinforced material main body, one end of the metal part is reversely buckled in the interior of the carbon fiber reinforced material main body, and the other end is exposed outside. This can reduce the weight and cost of the metal part.

[0055] The pull process of the carbon fiber reinforced material and the metal part is a process of mechanically connecting the carbon fiber reinforced material and the metal part. The pull process can adopt different molding methods, including: secondary molding, carbon spoke and metal part pull and outer wrapping yarn molding process; carbon spoke mandrel and metal part embedded and wrapped yarn molding; and carbon spoke mandrel and metal part direct pull one-step molding process.

[0056] When high-strength carbon fiber is selected as the raw material in S1, it needs to be properly heated. The heating temperature is set to 25-30℃, and the heating time is set to 1-2min.

[0057] Among them, by pre-treating the selected high-strength carbon fiber, the carbon fiber is softened by proper heating, which will have better layering or rolling in subsequent operations.

[0058] The temperature for molding in S2 is set to 145-155°C, the molding time is set to 15-25 min, and the cooling time is set to 8-12 min.

[0059] The temperature for molding in S2 is set to 145-155°C, the molding time is set to 15-25 min, and the cooling time is set to 8-12 min.

[0060] The temperature for molding in S2 is set to 145-155°C, the molding time is set to 15-25 min, and the cooling time is set to 8-12 min.

[0061] The temperature for molding in S2 is set to 145-155°C, the molding time is set to 15-25 min, and the cooling time is set to 8-12 min.

[0062] The temperature for molding in S2 is set to 145-155°C, the molding time is set to 15-25 min, and the cooling time is set to 8-12 min.

[0063] The temperature for molding in S2 is set to 145-155°C, the molding time is set to 15-25 min, and the cooling time is set to 8-12 min.

[0064] The temperature for molding in S2 is set to 145-155°C, the molding time is set to 15-25 min, and the cooling time is set to 8-12 min.

[0065] Example 1

[0066] The present embodiment provides a corrosion resistant coating for the surface of carbon fiber spokes, and the preparation raw materials of the corrosion resistant coating include, by weight: 30 parts of epoxy emulsion, 15 parts of silicone resin, 10 parts of filler, 1 part of preservative, 0.6 parts of defoaming agent, and 30 parts of dipropylene glycol butyl ether.

[0067] The epoxy emulsion is a multi-component epoxy high polymer polymerization emulsion, and the viscosity at 25°C is 800-2500 mPa.s, and the epoxy equivalent weight is 200-800 g / eq;

[0068] The viscosity of the silicone resin at 25°C is 500-3000 mPa.s;

[0069] The filler is rutile titanium dioxide and low-melting glass powder with a mass ratio of 5:1; the particle size of the rutile titanium dioxide is 30 nm, and the D50 of the low-melting glass powder is 1-30 μm;

[0070] The preservative is Kathon LXE from Kathon;

[0071] The defoaming agent is TEGO 902W product from TEGO;

[0072] The preparation method of the corrosion resistant coating includes: obtaining the preparation raw materials according to the required weight parts, adding them to a mixing container, stirring uniformly, spraying onto the surface of the carbon fiber spokes, coating a thickness of 10 μm, and drying to obtain the corrosion resistant coating.

[0073] Comparative Example 1

[0074] The specific implementation is the same as that of Example 1, except that the epoxy emulsion is a dendritic epoxy resin with an epoxy equivalent weight of 205-220 g / mol and a rotational viscosity of 14500-16000 cp, which is purchased from Weihai Chen Yuan Molecular New Material Co., Ltd. with model number CYE-002.

[0075] Comparative Example 2

[0076] The specific implementation is the same as that of Example 1, except that the silicone resin is replaced by an acrylic resin, which is purchased from Evonik.

[0077] Comparative Example 3

[0078] The specific implementation is the same as that of Example 1, except that the filler is rutile titanium dioxide and low-melting glass powder with a mass ratio of 1:5.

[0079] Comparative Example 4

[0080] The specific implementation is the same as that of Example 1, except that the filler is rutile titanium dioxide.

[0081] Performance test

[0082] The coating prepared in the examples and comparative examples was sprayed on the surface of carbon fiber spokes, the spraying thickness was 10 μm, and the following tests were carried out after drying.

[0083] The coating adhesion was tested according to GB / T9286-1998 Standard Test Method for Gravitative Adhesion of Paint and Varnish Films by Crosshatch;

[0084] The neutral salt spray test was tested according to GBT1771-1991-Determination of Resistance to Neutral Salt Spray of Paint and Varnish;

[0085] The acid corrosion resistance was tested according to JLY J711226, and the immersion time was 48 h.

[0086]

[0087]

[0088] In addition, it should be understood that although the present specification is described in terms of examples, not every example contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each example can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A process for manufacturing a carbon fiber spoke, characterized by: It comprises the following steps: S1: material selection and pretreatment: high-strength carbon fibers are selected as raw materials, and the number of layers of carbon fiber 0-degree direction and the arrangement mode in the angle direction are determined according to the specifications of carbon spokes; artificial or machine is used to roll and round; S2: mold forming: the carbon spoke main body is formed by a carbon spoke mold, heated and formed, and the length is taken according to the actual length specification, and the two ends of the carbon spoke are processed and polished; S3: metal piece is inserted: the metal piece is inserted into the carbon spoke main body according to the direction of the spoke; S4: winding together with the adhesive tape and carbon cloth: after the metal piece is inserted, the adhesive tape and carbon cloth are wound around the two ends of the carbon spoke main body, and then the metal piece is pulled tightly to the position by artificial rolling, wherein the hot set shape memory polymer is added between the adhesive tape and carbon cloth; S5: second winding of adhesive tape and carbon cloth: the adhesive tape and carbon cloth are wound again at the lower end of the metal piece and the connection between the metal piece and the carbon spoke according to the specified specifications, and then rolled by artificial rolling, wherein the hot set shape memory polymer is added between the adhesive tape and carbon cloth; S6: forming: the rolled carbon spoke is placed in the corresponding forming mold, heated and formed to obtain a carbon fiber spoke; S7: spraying a corrosion-resistant coating on the surface of the carbon fiber spoke, drying, and obtaining the finished product; The preparation raw materials of the corrosion-resistant coating include, by weight: 30 parts of epoxy emulsion, 15 parts of silicone resin, 10 parts of filler, 1 part of preservative, 0.6 parts of defoaming agent, 30 parts of dipropylene glycol butyl ether; The epoxy emulsion is a multi-component epoxy polymer emulsion, the viscosity at 25°C is 800-2500 mPa.s, and the epoxy equivalent is 200-800 g / eq; the viscosity of the silicone resin at 25°C is 500-3000 mPa.s; the filler is rutile titanium dioxide and low-melting glass powder with a mass ratio of 5:1, the particle size of the rutile titanium dioxide is 30 nm, and the D50 of the low-melting glass powder is 1-30 μm.

2. The manufacturing process of claim 1, wherein: In S1, the high-strength carbon fiber is heated at a temperature of 25-30°C for 1-2 min.

3. The manufacturing process of claim 1, wherein: In S2, the temperature for forming is set to 145-155°C, the forming time is set to 15-25 min, and the cooling time is set to 8-12 min.

4. The manufacturing process of claim 1, wherein: In S4, the adhesive tape and carbon cloth are evenly distributed and tightly wound around the two ends of the carbon spoke main body.

5. The manufacturing process of claim 1, wherein: In S5, the second winding of the adhesive tape and carbon cloth is matched with the first winding in position and mode, and the hot set shape memory polymer in S4 and S5 includes any one or more of cross-linked PE and trans-polyisoprene.

6. The manufacturing process of claim 1, wherein: In S6, the temperature for heating and forming is set to 145-155°C, the forming time is set to 10-20 min, and the cooling time is set to 5-10 min.

7. The manufacturing process of claim 1, wherein: The preparation method of the corrosion-resistant coating comprises: obtaining the preparation raw materials according to the required weight, adding them to a mixing container, stirring uniformly, spraying them onto the surface of the carbon fiber spoke with a coating thickness of 5-15 μm, and drying to obtain the corrosion-resistant coating.

8. A carbon fiber spoke, characterized by, The manufacturing process is prepared by any one of claims 1-7.

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