Release mandrel of carbon fiber rim and machining method of release mandrel

Abstract

The invention relates to the technical field of carbon fiber rims, and discloses a release mandrel of a carbon fiber rim, which comprises a release mandrel main body with an inflating and deflating function and an air tap mounted on the release mandrel main body, a release layer is arranged on the surface of the release mandrel body and can prevent adhesion when making contact with epoxy resin or thermoplastic materials. According to the debonding mandrel of the carbon fiber rim, the debonding mandrel body is made of a novel material and has good ductility, elasticity and excellent air tightness, the problems caused by insufficient ductility and air tightness of a traditional material are effectively solved, the size of the mandrel can be more accurately matched with a product, and the quality of the product is improved. According to the release mandrel, the release mandrel body can better adapt to complex product shapes, the phenomenon that the interior is wrinkled and unsmooth due to shape mismatching is reduced, the overall shape quality of the product is improved, the interior of the formed product is smoother, and the smoothness of the carbon fiber composite material is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of carbon fiber wheel rims, in particular to a release mandrel of a carbon fiber wheel rim and a processing method thereof. Background Art

[0002] Carbon fiber rims are widely used in bicycles, motorcycles, racing cars and other fields due to their light weight, high strength and excellent corrosion resistance. In the manufacturing process of carbon fiber rims, the release mandrel plays a vital role. It not only needs to ensure the precise molding of the rims, but also needs to facilitate demolding during the manufacturing process.

[0003] In the existing process, an extruded air bag is used as the core shaft of the wheel rim for blowing. Due to the insufficient ductility and air tightness of the material characteristics, the core shaft needs to be too large for production and the shape cannot match the product. As a result, when the product is inflated and hot-pressed, there will be wrinkles and unevenness inside the product, which affects the smoothness of composite materials such as carbon fiber, thereby reducing the rigidity of composite materials such as carbon fiber, affecting the quality and detection cost of the product. Therefore, we propose a release core shaft for carbon fiber wheel rims and a processing method thereof to solve the above-mentioned problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a release mandrel for a carbon fiber wheel rim and a processing method thereof, which solves the problem that the prior art uses an extruded air bag as the mandrel for blowing the wheel rim, and the mandrel needs to be too large for production due to the insufficient ductility and air tightness of the material characteristics, and the shape cannot match the product, resulting in wrinkles and unevenness inside the product during inflation and hot pressing, which affects the smoothness of composite materials such as carbon fiber, thereby reducing the rigidity of composite materials such as carbon fiber, and affecting the quality and testing costs of the product.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a release mandrel for a carbon fiber wheel rim, comprising a release mandrel body having a gas-injecting and gas-releasing function and a gas nozzle installed on the release mandrel body;

[0006] The surface of the release mandrel body has a release layer, and the release layer can prevent adhesion when in contact with epoxy resin or thermoplastic material;

[0007] The air is inflated and squeezed into the release mandrel body through the air nozzle to make it match the shape of the inner cavity of the carbon fiber wheel rim, and the carbon fiber composite material can be closely attached to the inner wall of the release mandrel body and be shaped.

[0008] Preferably, the material combination of the release core shaft body includes: 75%-90% EPDM rubber, 0.5%-3% vulcanizer, 1%-3% toughening agent, 0.5%-3% TMQ antioxidant, 1%-5% TMTD accelerator, 1%-2% stabilizer, 0.5%-4% RB antioxidant, and 1%-5% carbon black accelerator.

[0009] The present invention also provides a method for processing a release mandrel of a carbon fiber wheel rim, comprising the following steps:

[0010] S1. Design and determine the shape and size of the release mandrel body according to the actual internal dimensions of the product;

[0011] S2, mixing a rubber material having the material combination of the above-mentioned release mandrel body, wherein the material combination of the release mandrel body comprises: 75%-90% EPDM, 0.5%-3% vulcanizer, 1%-3% toughening agent, 0.5%-3% TMQ antioxidant, 1%-5% TMTD accelerator, 1%-2% stabilizer, 0.5%-4% RB antioxidant, and 1%-5% carbon black accelerator;

[0012] S3, manufacturing a release mandrel body by extrusion or other molding process;

[0013] S4, forming a release layer on the release mandrel body, wherein the release layer has an anti-adhesion property;

[0014] S5. Install the air nozzle on the release mandrel body;

[0015] S6, placing the release mandrel body into the mold;

[0016] S7, inflating the release mandrel body through an air nozzle to expand it and fit the inner cavity of the mold;

[0017] S8, closing the mold and applying pressure to mature the molding;

[0018] S9, removing the release mandrel body and performing a blow-up test on it;

[0019] S10, obtaining the finished product.

[0020] Beneficial Effects

[0021] The present invention provides a carbon fiber wheel rim release mandrel and a processing method thereof. Compared with the prior art, the present invention has the following beneficial effects:

[0022] The release mandrel of the carbon fiber wheel rim adopts a new type of material for the release mandrel body, which has good ductility, elasticity and excellent air tightness, effectively solving the problems of traditional materials caused by insufficient ductility and air tightness, so that the mandrel size can be more accurately matched to the product, and the release mandrel body can better adapt to the complex product shape, reducing the internal wrinkles and unevenness caused by shape mismatch, improving the overall shape quality of the product, and making the interior of the product smoother after molding, which significantly improves the smoothness of the carbon fiber composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] In the figure: 1. Separation mandrel body; 2. Air nozzle. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0026] like Figure 1 As shown:

[0027] A release mandrel for a carbon fiber wheel rim, comprising a release mandrel body 1 with a flushing and releasing gas, and an air nozzle 2 installed on the release mandrel body 1;

[0028] The surface of the release mandrel body 1 has a release layer, and the release layer can prevent adhesion when in contact with epoxy resin or thermoplastic material;

[0029] Inflate and squeeze the release mandrel body 1 through the air nozzle 2 to make it match the shape of the inner cavity of the carbon fiber wheel rim, and enable the carbon fiber composite material to be closely attached to the inner wall of the release mandrel body 1 and be shaped;

[0030] The material combination of the release mandrel body 1 includes: 75%-90% EPDM rubber, 0.5%-3% vulcanizer, 1%-3% toughening agent, 0.5%-3% TMQ antioxidant, 1%-5% TMTD accelerator, 1%-2% stabilizer, 0.5%-4% RB antioxidant, and 1%-5% carbon black accelerator.

[0031] In this embodiment: the release mandrel body 1 is designed with a flushing and deflation function, and can be inflated and deflated through the internal air nozzle 2 to adapt to the inner cavity of the carbon fiber wheel rim of different shapes and sizes. The air nozzle 2 is installed on the release mandrel body 1, and is used to inflate the inside of the mandrel, so that the mandrel can expand and fit closely to the shape of the inner cavity of the carbon fiber wheel rim to achieve consistency with the inner cavity of the product. The surface of the release mandrel body 1 has a release layer, which can effectively prevent adhesion when in contact with epoxy resin or thermoplastic material. The release layer can be polytetrafluoroethylene, silicone oil or silicone grease, which has an extremely low friction coefficient and non-adhesiveness, and can provide a good release effect;

[0032] The release mandrel body 1 specifically adopts 85% EPDM rubber. Ethylene propylene rubber is a synthetic rubber with good elasticity and chemical resistance, which is usually not easy to adhere to epoxy resin or thermoplastic materials. 2% of vulcanizer is added. The vulcanizer is used in the rubber vulcanization process to enhance the elasticity and durability of the rubber. Then 1.5% of toughening agent is added. The toughening agent can improve the ductility and toughness of the material. Then 2% of TMQ antioxidant is added. TMQ antioxidant is an anti-ozonant and antioxidant that can prevent rubber aging. Then 3% of TMTD accelerator is added. TMTD accelerator is a commonly used vulcanization accelerator that can increase the vulcanization speed. By adding 1.5% of stabilizer, the stabilizer is used to prevent the degradation of the material during processing and use. Then 2% of RB antioxidant is added. RB antioxidant can provide additional antioxidant and anti-ozone protection. Finally, 3% of carbon black accelerator is added. The carbon black accelerator can improve the mechanical strength and wear resistance of the rubber. It is made by mixing multiple groups of materials.

[0033] The new material used in the release mandrel body 1 of the present invention has good ductility, elasticity and excellent air tightness, which effectively solves the problems caused by insufficient ductility and air tightness of traditional materials, so that the mandrel size can be more accurately matched with the product, and the release mandrel body 1 can better adapt to complex product shapes, reduce internal wrinkles and unevenness caused by shape mismatch, improve the overall shape quality of the product, make the interior of the product smoother after molding, and significantly improve the smoothness of the carbon fiber composite material.

[0034] The present invention also provides a method for processing a release mandrel of a carbon fiber wheel rim, comprising the following steps:

[0035] S1. Design and determine the shape and size of the release mandrel body 1 according to the actual internal required size of the product;

[0036] S2, mixing a rubber material having the material combination of the above-mentioned release mandrel body, wherein the material combination of the release mandrel body comprises: 75%-90% EPDM, 0.5%-3% vulcanizer, 1%-3% toughening agent, 0.5%-3% TMQ antioxidant, 1%-5% TMTD accelerator, 1%-2% stabilizer, 0.5%-4% RB antioxidant, and 1%-5% carbon black accelerator;

[0037] S3, manufacturing the release mandrel body 1 by extrusion or other molding processes;

[0038] S4, forming a release layer on the release mandrel body 1, wherein the release layer has an anti-adhesion property;

[0039] S5, installing the air nozzle 2 on the release mandrel body 1;

[0040] S6, placing the release mandrel body 1 into the mold;

[0041] S7, inflating the release mandrel body 1 through the air nozzle 2 to expand it and fit the inner cavity of the mold;

[0042] S8, closing the mold and applying pressure to mature the molding;

[0043] S9, removing the release mandrel body 1 and performing a blowing test on it;

[0044] S10, obtaining the finished product.

[0045] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A release mandrel for a carbon fiber wheel rim, characterized in that: It comprises a release mandrel body (1) having flushing and releasing air, and a gas nozzle (2) installed on the release mandrel body (1); The release mandrel body (1) has a release layer on its surface, and the release layer can prevent adhesion when in contact with epoxy resin or thermoplastic material; Air is inflated and squeezed into the release mandrel body (1) through the air nozzle (2) to make it match the shape of the inner cavity of the carbon fiber wheel rim, and the carbon fiber composite material can be tightly attached to the inner wall of the release mandrel body (1) and shaped.

2. The release mandrel of the carbon fiber wheel rim according to claim 1, characterized in that: The material combination of the release mandrel body (1) comprises: 75%-90% EPDM rubber, 0.5%-3% vulcanizer, 1%-3% toughening agent, 0.5%-3% TMQ antioxidant, 1%-5% TMTD accelerator, 1%-2% stabilizer, 0.5%-4% RB antioxidant, and 1%-5% carbon black accelerator.

3. The method for processing a release mandrel of a carbon fiber wheel rim according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Designing and determining the shape and size of the release mandrel body (1) according to the actual internal required size of the product; S2, mixing the rubber material having the material combination of claim 2; S3, manufacturing a release mandrel body (1) by extrusion or other molding processes; S4, forming a release layer on the release mandrel body (1), wherein the release layer has an anti-adhesion property; S5. Installing the air nozzle (2) on the release mandrel body (1); S6, placing the release mandrel body (1) into the mold; S7, inflating the release mandrel body (1) through the air nozzle (2) to expand it and fit it into the inner cavity of the mold; S8, closing the mold and applying pressure to mature the molding; S9, removing the release mandrel body (1) and performing a blow-up test on it; S10, obtaining the finished product.

Images