High-strength closed wheel and preparation method thereof

Abstract

The invention relates to the technical field of rim production, in particular to a high-strength closed wheel which comprises an outer ring and a supporting disc, the outer ring is fixedly arranged on the supporting disc in a sleeving mode, a supporting groove is formed in the supporting disc, and a plurality of honeycomb structures are arranged in the supporting groove. The aramid fiber honeycomb is processed into the initial shape of the rim shape; 2, preparing carbon fibers; step 3, preparing a glue film; 4, carbon fibers are attached to the surface of the mold, and then the adhesive film is attached to the carbon fibers; step 5, fixing the aramid fiber honeycomb on the adhesive film; step 6, reversely wrapping the aramid fiber honeycomb with the carbon fibers to form a primary rim shape; 7, the mold is pushed into forming equipment, and high-temperature and high-pressure curing forming is carried out; and 8, cold pressing is conducted finally, the mold is opened after cold pressing, and a product is taken out. The key force bearing area of the supporting disc is filled with the honeycomb structure, the strength is improved, and meanwhile the weight of the rim is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rim production, in particular to a high-strength closed wheel and a preparation method thereof. BACKGROUND

[0002] In order to reduce the wind resistance of racing bicycles, many racing bicycles currently adopt a closed wheel design. In the case of high-speed riding, the aerodynamic performance of the closed wheel from various wind directions is more excellent than that of a high-frame wheel set, and the wind resistance is smaller, which is beneficial to the speed improvement.

[0003] The common way of the current closed wheel is to fill the inner cavity of the closed wheel with foam material, but the weight reaches 1.5 kg or more. Since the closed space inside the closed wheel is generally consistent with the shape of the rim, and the outer carbon tire groove piece has an inner concave tire groove part, the shape of the closed space is very irregular. In order to reduce this irregularity, more filling materials need to be put in, which leads to a large weight and low strength.

[0004] Based on this, the present application designs a high-strength closed wheel and a preparation method thereof to solve the above problems. SUMMARY

[0005] To achieve the above purpose, the present application provides the following technical scheme: a high-strength closed wheel, comprising an outer ring and a support disc, the outer ring is fixed on the support disc, a support groove is formed in the support disc, and a plurality of honeycomb structures are arranged in the support groove.

[0006] Preferably, the honeycomb is an aramid honeycomb.

[0007] Preferably, the outer ring is made of carbon fiber.

[0008] Preferably, a preparation method of a high-strength closed wheel comprises the following steps: step 1, processing aramid honeycomb into a preliminary shape of a rim model; step 2, preparing carbon fiber; step 3, preparing adhesive film; step 4, attaching carbon fiber to the surface of a mold, and then attaching adhesive film on the carbon fiber; step 5, fixing the aramid honeycomb on the adhesive film; step 6, wrapping the aramid honeycomb with carbon fiber to form a preliminary rim model; step 7, putting the mold into a forming equipment for high-temperature and high-pressure curing; and step 8, finally performing cold pressing, and then opening the mold to take out the product.

[0009] Preferably, the preparation of carbon fiber in step 2 specifically refers to preparing carbon fiber into a required composite rim model in advance.

[0010] Preferably, the temperature of high-temperature and high-pressure curing in step 7 is 140-160 degrees.

[0011] Preferably, the cold pressing time in step 8 is greater than 20 minutes.

[0012] Preferably, the product is taken out when the temperature is below 40 degrees after cold pressing in step 8.

[0013] Preferably, it further comprises step 9, spraying paint on the taken-out product to color the surface of the wheel rim.

[0014] Preferably, it further comprises step 10, polishing the wheel rim after coloring.

[0015] In summary, the present application has the following beneficial technical effects: 1. The key load-bearing area of the support disc is filled with a honeycomb structure, which takes advantage of the extremely high specific strength of the honeycomb core material to provide excellent compression resistance, bending resistance and shear resistance while significantly reducing the overall weight of the wheel, thereby supporting the outer rim and achieving the effect of improving strength while reducing weight; 2. Through the steps of laying carbon fiber, adhesive film, honeycomb and re-wrapping carbon fiber, and curing under high temperature and high pressure, the bonding strength between the carbon fiber skin and the aramid honeycomb core can be maximized to prevent delamination.

[0016] 3. The cold pressing step is carried out after high-temperature curing, so that the product cools under pressure to near room temperature. This can effectively reduce or eliminate deformation and internal stress caused by differences in thermal expansion coefficients of materials and molds or resin shrinkage, ensuring product size stability and shape accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a schematic diagram of the overall structure of the high-strength closed wheel in the present embodiment; Figure 2 It is a schematic diagram of the structure of the support disc in the present embodiment; Figure 3 It is a schematic diagram of the honeycomb structure in the present embodiment; Figure 4 It is a compression test result diagram of the high-strength closed wheel; Figure 5 It is a compression test result diagram of the traditional closed wheel.

[0019] In the drawings, the components represented by each reference numeral are listed as follows: 1, outer rim; 2, support disc; 3, honeycomb structure; 4, support groove. DETAILED DESCRIPTION

[0020] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0021] The application will be further described in detail below with reference to the drawings. Figures 1-5 The application will be further described in detail below with reference to the drawings.

[0022] A high-strength closed wheel comprises an outer ring 1 and a support disc 2, the outer ring 1 is fixed on the support disc 2, the support disc 2 is provided with a support groove 4, and a plurality of honeycomb structures 3 are arranged in the support groove 4, the honeycomb is aramid honeycomb, the outer ring 1 is made of carbon fiber, and the support disc 2 is made of carbon fiber. A high-strength closed wheel and a preparation method thereof, comprising the following steps: step 1, aramid honeycomb is processed into a preliminary shape of a wheel rim, here, the aramid honeycomb is processed into the shape of the support disc 2; Step 2, carbon fiber preparation, specifically, the carbon fiber is prepared into a required wheel rim shape in advance; Step 3, adhesive film preparation, specifically, according to the size of the carbon fiber wheel rim, corresponding adhesive films are prepared; Step 4, the carbon fiber is attached to the surface of a mold, and the adhesive film is attached to the carbon fiber; Step 5, the aramid honeycomb is fixed on the adhesive film, and the aramid honeycomb is located in the outer ring 1 of carbon fiber, forming a carbon fiber outer ring 1-adhesive film-aramid honeycomb structure 3 structure from the outside to the inside; Step 6, the excess fiber is wrapped around the aramid honeycomb, the aramid honeycomb is wrapped into a column, and a preliminary wheel rim shape is formed, at this time, the carbon fiber wrapped around the aramid honeycomb forms the support disc 2; Step 7, the mold is pushed into a forming device, and is cured and formed under high temperature and high pressure, the temperature of the high-temperature and high-pressure curing and forming is 140-160 degrees, and the forming temperature in the embodiment is 155 degrees; Step 8, finally, cold pressing is performed, the mold is opened to take out the product after the cold pressing, and the cold pressing time is more than 20 minutes, and the cold pressing time in the embodiment is 25 minutes, and the product is taken out after the temperature is lower than 40 degrees; Step 9, the taken-out product is painted, and the surface of the wheel rim is colored; Step 10, the wheel rim after coloring is polished.

[0023] The high-strength closed wheel prepared by the above process is tested for rigidity by a lateral rigidity measurement method, which is specifically that at the air nozzle hole, 1 kg, 2 kg, and 3 kg are applied in m, and the deviation of the rim is measured in X, and then the lateral rigidity can be calculated by the formula: m*g / x, and the average value of 3 test values is the final lateral rigidity; The test results of the high-strength closed wheel in this embodiment are shown in Table 1.

[0024] Table 1, rigidity test of high-strength closed wheel The test results of the conventional closed wheel by the same test method are shown in Table 2.

[0025] Table 2, rigidity test of conventional closed wheel From Table 1, the average rigidity value of the high-strength closed wheel of the present application is 125.19, and from Table 2, it can be known that the average rigidity value of the conventional closed wheel is 44.46, so it can be seen that the average rigidity value of the high-strength closed wheel in the present application is much greater than that of the conventional closed wheel; therefore, the high-strength closed wheel in this embodiment has good resistance to distortion and deformation.

[0026] The high-strength closed wheel in this embodiment is subjected to compression resistance test, and the specific detection method is that the closed wheel is placed on the compression resistance test equipment, the pressure head of the compression resistance test equipment is pressed to 300 kg or more at a speed of 25.4 mm / min, and the test result is shown in Figure 4 The conventional closed wheel is subjected to compression resistance test, and the detection method is the same as above, and the detection result is shown in Figure 5

[0027] It can be known from Figure 4 that the maximum pressure value that can be resisted by the high-strength closed wheel of the present application is 9000N, and from Figure 5 it can be known that the maximum pressure value that can be resisted by the conventional closed wheel is between 4800N and 5400N, so it can be seen that the compression resistance of the high-strength closed wheel in this embodiment is much higher than that of the conventional closed wheel.

[0028] The high-strength closed wheel in this embodiment is subjected to static deformation test, and the test method is as follows: first, the diameter of the closed wheel is tested, then the closed wheel is placed on the compression resistance test equipment, the pressure head applies a force of 200 kg, and after keeping for two minutes, the closed wheel is taken down, the diameter of the closed wheel is tested, and the deformation is less than 1 mm for three times, which is qualified, and the test result is shown in Table 3.

[0029] Table 3, static deformation test of high-strength closed wheel ​From table 5, it can be seen that the deformation of the high-strength closed wheel in the embodiment after being pressed is far below 1mm in three tests, and thus it can be seen that the high-strength closed wheel in the embodiment has good recovery effect after being pressed.

[0030] The embodiment has the following beneficial effects: 1. The key load-bearing area of the support disc is filled with a honeycomb structure, the high specific strength characteristics of the honeycomb core are utilized, the overall wheel weight is significantly reduced, excellent compression resistance, bending resistance and shear resistance are provided, the outer ring is supported, the effect of improving the strength while reducing the weight is achieved; 2. Through the steps of laying and pasting carbon fibers, adhesive films, honeycombs and rewrapping carbon fibers, and curing under high temperature and high pressure, the bonding strength between the carbon fiber skin and the aramid honeycomb core can be maximized, and delamination can be prevented.

[0031] 3. The cold pressing step is implemented after high-temperature curing, so that the product is cooled to near room temperature under pressure; this can effectively reduce or eliminate deformation and internal stress caused by differences in thermal expansion coefficients of materials and molds or resin shrinkage, and ensure the dimensional stability and shape accuracy of the product.

[0032] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screw connection" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited, the specific meaning of the above terms in the present application can be understood according to the specific circumstances by those skilled in the art.

[0034] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A high strength sealed wheel characterized by: Including outer ring (1), support disc (2), the outer ring (1) is fixed on support disc (2), the support disc (2) is opened in support groove (4), the support groove (4) is provided with multiple honeycomb structure (3).

2. A high strength sealed wheel as claimed in claim 1, wherein: The honeycomb is aramid honeycomb.

3. A high strength sealed wheel as defined in claim 1, wherein: The outer ring (1) is made of carbon fiber.

4. A high strength sealed wheel and method of making the same, characterized by: Including the following steps: Step 1, aramid honeycomb is processed into the preliminary shape of wheel rim shape; Step 2, carbon fiber preparation; Step 3, adhesive film preparation; Step 4, carbon fiber is attached to the surface of the mold, and the adhesive film is attached on the carbon fiber; Step 5, aramid honeycomb is fixed on the adhesive film; Step 6, carbon fiber is wrapped around aramid honeycomb to form a preliminary wheel rim shape; Step 7, the mold is pushed into the forming equipment, and is cured by high temperature and high pressure; Step 8, finally, cold pressing is carried out, and the product is taken out after cold pressing.

5. A high strength sealed wheel and method of making the same according to claim 4, wherein: The preparation of carbon fiber in step 2 specifically refers to preparing carbon fiber into the required composite wheel rim shape in advance.

6. A high strength sealed wheel and method of making the same according to claim 4, wherein: The temperature of high temperature and high pressure curing in step 7 is 140-160 degrees.

7. A high strength sealed wheel and method of making the same according to claim 4, wherein: The cold pressing time in step 8 is greater than 20 minutes.

8. A high strength sealed wheel and method of making the same according to claim 7, wherein: After cold pressing in step 8, the product is taken out when the temperature is lower than 40 degrees.

9. A high strength sealed wheel and method of making the same according to claim 4, wherein: It also includes step 9, which sprays paint on the product taken out to color the surface of the wheel rim.

10. A high strength sealed wheel according to claim 1, wherein: It also includes step 4, which polishes the wheel rim after coloring.

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