Manufacturing method of carbon fiber soft tail bicycle rear triangle

Abstract

A method for manufacturing a rear triangle of a carbon fiber soft-tail bicycle comprises the following steps: (1) coiling: splitting the rear triangle of the carbon fiber soft-tail bicycle into a left component and a right component, namely a component I and a component II; (2) forming, wherein the forming mode is a blowing and mould pressing forming mode; (3) combining: gluing and covering the component I and the component II through a special jig; and (4) grinding and coating are conducted, after combination is completed, excessive glue and burrs are cleaned, the surface of the product is coarsened and repaired to be smooth, and then primer, colored paint and finish paint are sprayed. According to the method, the rear triangle is divided into the left assembly and the right assembly, the continuity of the carbon fibers is guaranteed to the maximum extent, the weight is lighter under the same strength requirement, the carbon fibers can be manufactured through two forming molds, a shaping jig is simple, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of carbon fiber bicycle production, in particular to a method for manufacturing a rear triangle of a carbon fiber soft-tail bicycle. Background Art

[0002] The carbon fiber soft tail bicycle frame is divided into the front triangle, rear triangle and rear shock absorber. The current production process for the rear triangle is to split it into several components and then glue it into a complete rear triangle shape. However, there are many components after splitting (such as Figure 1 ), component 1 and component 2 share a set of molding molds, component 3 has a set of molding molds, component 4 has a set of molding molds, and component 5 and component 6 share a set of molding molds, totaling 4 sets of molding molds. Secondly, the carbon fiber between each component connection is discontinuous, and the combination requires gluing and yarn wrapping. The joints also need to ensure a certain thickness, and the weight naturally increases. Because there are more components, the shaping fixture needs to design more fixed ends, and the fixture cost and connection process are more complicated. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for manufacturing the rear triangle of a carbon fiber soft-tail bicycle in view of the shortcomings of the prior art. By splitting the rear triangle into two left and right components, the continuity of the carbon fiber is guaranteed to the greatest extent. The weight is lighter under the same strength requirement. It can be manufactured with two molding molds, the shaping fixture is relatively simple, and the work efficiency is greatly improved.

[0004] The technical problem to be solved by the present invention is achieved by the following technical solution. The present invention is a method for manufacturing a rear triangle of a carbon fiber soft-tail bicycle, which comprises the following process: (1) Coil The rear triangle of the carbon fiber soft-tail bicycle is split into two components: component I and component II. When rolling the material, the inner core material support is designed. The inner core material is covered with an air bag of corresponding size and vacuumed to make it fit the outer surface of the core material. A certain amount of air bag is reserved at special corners or joints to prevent the air bag from blowing and leaking. Then the material is pasted according to the shape of the inner core material and the laying design; (2) Molding The molding method is air blowing and molding. The rear fork pivot and hook of the rear triangle of the carbon fiber soft tail bicycle are molded, and other positions are blown. (3) Combination Components I and II are glued and wrapped with yarn using a special jig. A male and female joint structure is designed at the disconnection point between components I and II. After the male and female joints are glued, the outer side is designed with yarn wrapped and divided into two steps for yarn wrapping; (4) Re-grinding and painting After the assembly is completed, clean up the excess glue and burrs, roughen the product surface and repair it to make it smooth, then spray primer, color paint and topcoat.

[0005] The technical problem to be solved by the present invention can also be further achieved by the following technical solution. For the method for making the rear triangle of the carbon fiber soft-tail bicycle described above, in step (1), the inner core material is EPS, polystyrene foam, polyurethane or polyethylene.

[0006] The technical problem to be solved by the present invention can be further achieved by the following technical solutions. For the method for making the rear triangle of the carbon fiber soft-tail bicycle described above, in step (1), when the air bag is evacuated, a release agent should be applied to the air bag to facilitate extraction after molding; when pasting the material, the surface of the air bag should be kept clean and soft, and the pasting environment should be clean, with a temperature of 22 to 26°C and a humidity of no more than 60%.

[0007] The technical problem to be solved by the present invention can be further achieved by the following technical solution. For the method for making the rear triangle of the carbon fiber soft tail bicycle described above, in step (2), the blowing pressure is 1.0-1.5 MPa, and the furnace pressure is 90-100 Kg / cm 2 , the molding temperature is 145±10℃, and the molding time is 30~60min.

[0008] The technical problem to be solved by the present invention can also be further achieved by the following technical scheme. For the method for making the rear triangle of the carbon fiber soft-tail bicycle described above, in step (3), the insertion depth of the male joint is 20 to 25 mm, the single-side width of the adhesive gap between the male and female joints is designed to be 0.15 to 0.2 mm, and the overall thickness of the yarn wrapping is 0.5 mm; of the two steps, the first step has a width of 20 mm and a depth of 0.3 mm, and the second step has a width of 30 mm and a depth of 0.2 mm.

[0009] The technical problem to be solved by the present invention can be further achieved by the following technical solution. For the method for manufacturing the rear triangle of a carbon fiber soft-tail bicycle described above, in step (3), a transition zone with a width of 3 mm is also designed on components I and II on both sides of the male and female joint structures to disperse the end stress of the prepreg.

[0010] The technical problem to be solved by the present invention can be further achieved by the following technical solution. For the method for making the rear triangle of the carbon fiber soft-tail bicycle described above, in step (3), the adhesive used for gluing the male and female joints is an epoxy room temperature adhesive, an epoxy medium temperature adhesive or an epoxy high temperature adhesive.

[0011] The technical problem to be solved by the present invention can also be further achieved by the following technical scheme. For the method for manufacturing the rear triangle of the carbon fiber soft-tail bicycle described above, in step (3), the yarn covering material is a yarn covering material made of carbon fiber prepreg, glass fiber prepreg, basalt fiber prepreg, aramid fiber prepreg or fiber dry cloth combined with hand-laid epoxy resin.

[0012] Compared with the prior art, the present invention improves the old production process in a targeted manner, solves the above-mentioned series of pain points, ensures the continuity of the fiber to the greatest extent, is lighter in weight under the same strength requirement, can be produced with two molding molds, has a relatively simple shaping fixture, and greatly improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a disassembled diagram of the manufacturing process components of the rear triangle in the prior art; Figure 2 This is a disassembled diagram of the manufacturing process components of the rear triangle of the present invention; Figure 3 It is a schematic diagram of the combined structure of the rear triangle of the present invention. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Reference Figure 2-3 A method for manufacturing a rear triangle of a carbon fiber soft tail bicycle, wherein the rear triangle is split into two components: component I1 and component II2, which ensures the continuity of the fiber to the greatest extent, and is lighter in weight under the same strength requirement. Two molding molds are sufficient for manufacturing, and the shaping jig is relatively simple, and the work efficiency is greatly improved. The specific process is: (1) Coil The rear triangle of the carbon fiber soft tail bicycle is split into two components: component I1 and component II2. Figure 2 The dotted line in the figure represents the splitting line. When rolling the material, the inner core material support is designed. The inner core material is covered with an air bag of corresponding size and vacuumed to make it fit the outer surface of the core material. A certain amount of air bags are reserved at special corners or joints to prevent the air bags from being blown and leaking. The air bags should be coated with a release agent to facilitate extraction after forming. Then, the material is pasted according to the shape of the inner core material and the laying design. When pasting, the surface of the air bag must be kept clean and soft. The pasting environment must be clean, with a temperature of 22-26°C and a humidity of no more than 60%. Among them, the inner core material is EPS, polystyrene foam, polyurethane or polyethylene. Of course, other materials that can meet the characteristics of light weight, certain hardness at room temperature, high temperature shrinkage, low cost, etc. can also be used; (2) Molding The molding method is air blowing and molding. The rear fork of the rear triangle of the carbon fiber soft tail bicycle is molded at the shaft and the hook, and the other positions are blown. The blowing pressure is 1.0-1.5MPa and the furnace pressure is 90-100Kg / cm 2 , molding temperature is 145±10℃, molding time is 30~60min; Of course, the molding method can also be other composite material molding processes that can meet the requirements, such as autoclave, vacuum bag pressing, etc.; (3) Combination Components I1 and II2 are glued and covered with yarn by a special jig, and a male and female joint structure 3 is designed at the disconnection point between components I1 and II2. The insertion depth of the male joint is 20-25 mm, and the single-side width of the male and female joint gluing gap is designed to be 0.15-0.2 mm. The range can be expanded accordingly according to the product shape and strength requirements; After the male and female joints are glued, the outer side is designed with yarn wrapping, the overall thickness of the yarn wrapping is 0.5mm, and the yarn wrapping is divided into two steps. The first step 4 is 20mm wide and 0.3mm deep, and the second step 5 is 30mm wide and 0.2mm deep. Among them, the adhesive used for gluing male and female joints is epoxy room temperature adhesive, epoxy medium temperature adhesive or epoxy high temperature adhesive, or other adhesives that can meet the requirements of various types of products such as room temperature, medium temperature and high temperature; The yarn covering material is a yarn covering material made of carbon fiber prepreg, glass fiber prepreg, basalt fiber prepreg, aramid fiber prepreg or fiber dry cloth combined with hand-laid epoxy resin.

[0016] In addition, a transition zone 6 with a width of 3 mm is also designed on the components I1 and II2 on both sides of the male and female joint structure 3 to disperse the stress at the end of the prepreg; see Figure 3 ; (4) Re-grinding and painting After the assembly is completed, clean up the excess glue and burrs, roughen the product surface and repair it to make it smooth, then spray primer, color paint and topcoat.

[0017] The manufacturing method of the rear triangle of a carbon fiber soft-tail bicycle provided by the present invention is compared with the traditional manufacturing method. The previous manufacturing method uses more molds and jigs, and the carbon fiber continuity of too many split components is poor, which increases the weight of the product while reducing the strength. The production of too many components increases the use of personnel and energy in production accordingly, reduces production efficiency, and increases related costs. The present invention specifically improves the old production process and solves the above-mentioned series of pain points. It has the advantages of good strength, light weight, low cost, high production efficiency, etc., and is also suitable for other composite materials products that need to be split and manufactured, such as drones, rail transit products, etc.

Claims

1. A method for manufacturing a rear triangle of a carbon fiber soft-tail bicycle, characterized in that: The method includes the following steps: (1) Coil The rear triangle of the carbon fiber soft-tail bicycle is split into two components: component I and component II. When rolling the material, the inner core material support is designed. The inner core material is covered with an air bag of corresponding size and vacuumed to make it fit the outer surface of the core material. A certain amount of air bag is reserved at special corners or joints to prevent the air bag from blowing and leaking. Then the material is pasted according to the shape of the inner core material and the laying design; (2) Molding The molding method is air blowing and molding. The rear fork pivot and hook of the rear triangle of the carbon fiber soft tail bicycle are molded, and other positions are blown. (3) Combination Components I and II are glued and wrapped with yarn using a special jig. A male and female joint structure is designed at the disconnection point between components I and II. After the male and female joints are glued, the outer side is designed with yarn wrapped and divided into two steps for yarn wrapping; (4) Re-grinding and painting After the assembly is completed, clean up the excess glue and burrs, roughen the product surface and repair it to make it smooth, then spray primer, color paint and topcoat.

2. The method for manufacturing the rear triangle of a carbon fiber soft-tail bicycle according to claim 1, characterized in that: In step (1), the inner core material is EPS, polystyrene foam, polyurethane or polyethylene.

3. The method for manufacturing the rear triangle of a carbon fiber soft-tail bicycle according to claim 1 or 2, characterized in that: In step (1), when the air bag is evacuated, a release agent should be applied to the air bag to facilitate removal after forming; when pasting the material, the surface of the air bag should be kept clean and soft, and the pasting environment should be clean, with a temperature of 22 to 26°C and a humidity of no more than 60%.

4. The method for manufacturing the rear triangle of a carbon fiber soft-tail bicycle according to claim 1, characterized in that: In step (2), the blowing pressure is 1.0-1.5 MPa and the furnace pressure is 90-100 Kg / cm 2 , the molding temperature is 145±10℃, and the molding time is 30~60min.

5. The method for manufacturing the rear triangle of a carbon fiber soft-tail bicycle according to claim 1, characterized in that: In step (3), the insertion depth of the male connector is 20 to 25 mm, the single-side width of the adhesive gap between the male and female connectors is designed to be 0.15 to 0.2 mm, and the overall thickness of the yarn wrapping is 0.5 mm; in the two steps, the first step is 20 mm wide and 0.3 mm deep, and the second step is 30 mm wide and 0.2 mm deep.

6. The method for manufacturing the rear triangle of a carbon fiber soft-tail bicycle according to claim 1 or 5, characterized in that: In step (3), a transition zone with a width of 3 mm is also designed on components I and II on both sides of the male and female joint structure to disperse the stress at the end of the prepreg.

7. The method for manufacturing the rear triangle of a carbon fiber soft-tail bicycle according to claim 1, characterized in that: In step (3), the adhesive used for gluing the male and female joints is an epoxy room temperature adhesive, an epoxy medium temperature adhesive, or an epoxy high temperature adhesive.

8. The method for manufacturing the rear triangle of a carbon fiber soft-tail bicycle according to claim 1 or 7, characterized in that: In step (3), the yarn covering material is a yarn covering material made of carbon fiber prepreg, glass fiber prepreg, basalt fiber prepreg, aramid fiber prepreg or fiber dry cloth combined with hand-laid epoxy resin.

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