Preparation method of large-tow forged composite material luggage rack end plate

Abstract

The invention discloses a preparation method of a large-tow forged composite material luggage rack end plate, and belongs to the technical field of composite material manufacturing, and the preparation method comprises the following steps: preparing a large-tow forged composite material; blanking the large-tow forging composite material according to the structural form of the luggage rack end plate; the blanked large-tow forging composite material is combined with a mold to form a blank pre-pressed solid of the luggage rack end plate; and the blank pre-pressed entity is subjected to mold pressing and demolding, and the finished luggage rack end plate is obtained. According to the preparation method of the large-tow forged composite material baggage holder end plate, the unidirectional large-tow prepreg is cut and randomly laid to prepare the forging die material, the baggage holder end plate is integrally formed through the composite material, and the preparation method has the advantages of being simple in process, rapid in forming and obvious in weight reduction; the obtained product is good in bearing capacity and does not need to be machined again after being formed, the production and manufacturing efficiency is improved, and the selected large-tow prepreg is low in cost.

Description

Technical Field

[0001] The invention relates to the technical field of composite material manufacturing, and in particular to a method for preparing a large-tow forged composite material luggage rack end plate. Background Art

[0002] At present, the end plates of high-speed rail luggage racks are mainly made of forged aluminum alloy, the molding process is complicated, and after compression molding, they still need to be machined for surface treatment. The production cycle is relatively long. The current rail transit field needs to achieve lightweight car bodies, and the luggage rack end plates forged from aluminum alloy will increase the weight of the car body, which does not conform to the current development trend of the rail transit field.

[0003] In the prior art, ordinary SMC composite materials are often used to prepare high-speed railway luggage rack end plates to reduce the weight of the high-speed railway luggage rack end plates. Although the weight is reduced compared to aluminum alloy forging parts, since the luggage rack end plates need to have a certain load-bearing capacity and need to be stably connected to the frame, the luggage rack end plates themselves need to be provided with connecting holes to connect with the brackets, and the connecting structures connected to the vehicle body are usually slender in size. When these structures are prepared using ordinary SMC composite materials, there will be repeated heating and cooling processes during the entire product molding process, which causes the molded products to be prone to deformation and bubbles, resulting in insufficient load-bearing capacity of the high-speed railway luggage rack end plates, low yield rate, and poor flatness of the resulting rough products. Specific finishing is still required to meet the product production standards, which will consume a lot of manpower and material resources and greatly increase the cost of production.

[0004] Therefore, how to design and provide a method for preparing the end plate of a high-speed railway luggage rack with simple process and fast forming, and achieve weight reduction while ensuring the bearing capacity of the product is an urgent problem to be solved in the current rail transit field. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a method for preparing a luggage rack end plate of a large-tow forged composite material. The luggage rack end plate is integrally formed using the composite material by slitting and randomly laying unidirectional large-tow prepreg. The method has the advantages of simple process, fast forming and obvious weight reduction. The obtained product has excellent mechanical properties and good bearing capacity. No machining is required after forming, which improves the efficiency of production and manufacturing. The selected large-tow prepreg has a low cost.

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect of the present invention, a method for preparing a large-tow forged composite luggage rack end plate is provided, comprising:

[0008] Preparation of large-tow forging composites;

[0009] Cutting the large-tow forged composite material according to the structural form of the luggage rack end plate;

[0010] The blanked large-tow forged composite material is combined with a die to form a pre-pressed solid body of the luggage rack end plate;

[0011] The blank pre-pressed entity is molded and then demoulded to obtain a finished luggage rack end plate.

[0012] In some embodiments of the present invention, the large-tow forged composite material is prepared by compacting chopped unidirectional large-tow carbon fiber prepreg.

[0013] In some embodiments of the present invention, the large-tow forging composite material is prepared by compacting short-cut unidirectional large-tow carbon fiber prepreg, specifically: short-cut unidirectional large-tow carbon fiber prepreg tapes are selected for cutting, and the large-tow carbon fiber prepreg tapes are cut into rectangular short-cut prepreg narrow tapes; the short-cut prepreg narrow tapes are randomly laid and compacted to form a large-tow forging composite material and then rolled up.

[0014] In some embodiments of the present invention, the large-tow forging composite material has a carbon fiber content greater than 60% and a thickness greater than 2 mm.

[0015] In some embodiments of the present invention, the large-tow forged composite material is cut according to the structural form of the luggage rack end plate, specifically: according to the structural form of the luggage rack end plate, the rolled large-tow forged composite material is cut to obtain paving material, and the paving material is paved on the luggage rack end plate.

[0016] In some embodiments of the present invention, the shape and size of the paving material are consistent with the shape and size of the luggage rack end plate.

[0017] In some embodiments of the present invention, the blanked large tow forged composite material is combined with a die to form a pre-pressed entity of the luggage rack end plate, specifically:

[0018] The paving materials are laid on the mold in sequence to form a preliminary structural blank shape, and then the preliminary structural blank shape is pre-compacted to form a blank pre-compacted entity of the luggage rack end plate.

[0019] In some embodiments of the present invention, the demoulding of the pre-pressed blank entity after molding is specifically as follows:

[0020] The upper and lower molds are closed, and the molds are heated according to the curing conditions to achieve pre-compression of the blank entity by heating and pressurizing. After keeping warm for a period of time, the product molding is completed. After the product molding is completed, the upper and lower molds are demolded to take out the finished luggage rack end plate.

[0021] In a second aspect of the present invention, there is provided a luggage rack end plate obtained according to the above-mentioned method for preparing the large-tow forged composite luggage rack end plate.

[0022] In a third aspect of the present invention, a vehicle body is provided, comprising a high-speed railway luggage rack end plate obtained by the above-mentioned method for preparing the large-tow forged composite material high-speed railway luggage rack end plate.

[0023] One or more technical solutions of the present invention have the following beneficial effects:

[0024] The present invention provides a method for preparing a luggage rack end plate of a large-tow forged composite material. The method comprises cutting a unidirectional large-tow prepreg and randomly laying a prepared forging die material, and using the composite material to integrally form the luggage rack end plate. The method has the advantages of simple process, fast forming and significant weight reduction. The obtained product has excellent mechanical properties and good bearing capacity. After forming, no machining is required, thereby improving the efficiency of production and manufacturing. In addition, the selected large-tow prepreg has a low cost.

[0025] The large-tow forged composite material provided by the present invention is prepared by slitting large-tow carbon fiber prepreg, and the preparation process is simple. Its thickness is ≥2mm. Compared with pure prepreg, the process laying time is greatly reduced. It only needs to be weighed and filled into the mold for molding, which improves production efficiency. There is about 15% fluidity between the pre-pressed solid fibers of the blank, so that it can make up for certain defects during the molding process, and can form more complex structures, reducing the structural deformation and bubbles generated in the luggage rack end plate during the molding process. The fiber content reaches 60-70%, ensuring lightweight while having good load-bearing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of the high-speed railway luggage rack end plate provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] At present, the end plates of high-speed rail luggage racks are mainly made of forged aluminum alloy, the molding process is complicated, and after compression molding, they still need to be machined for surface treatment. The production cycle is relatively long. The current rail transit field needs to achieve lightweight car bodies, and the luggage rack end plates forged from aluminum alloy will increase the weight of the car body, which does not conform to the current development trend of the rail transit field.

[0029] In the prior art, ordinary SMC composite materials are often used to prepare high-speed railway luggage rack end plates to reduce the weight of the high-speed railway luggage rack end plates. Although the weight is reduced compared to aluminum alloy forging parts, since the luggage rack end plates need to have a certain load-bearing capacity and need to be stably connected to the frame, the luggage rack end plates themselves need to be provided with connecting holes to connect with the brackets, and the connecting structures connected to the vehicle body are usually slender in size. When these structures are prepared using ordinary SMC composite materials, there will be repeated heating and cooling processes during the entire product molding process, which causes the molded products to be prone to deformation and bubbles, resulting in insufficient load-bearing capacity of the high-speed railway luggage rack end plates, low yield rate, and poor flatness of the resulting rough products. Specific finishing is still required to meet the product production standards, which will consume a lot of manpower and material resources and greatly increase the cost of production.

[0030] Therefore, the present invention is designed to provide a method for preparing a high-speed railway luggage rack end plate with a simple process and rapid forming, thereby achieving weight reduction while ensuring the bearing capacity of the product.

[0031] Example 1

[0032] In a typical embodiment of the present invention, a method for preparing a large-tow forged composite luggage rack end plate is provided, comprising:

[0033] Preparation of large-tow forging composites;

[0034] Cutting the large-tow forged composite material according to the structural form of the luggage rack end plate;

[0035] The blanked large-tow forged composite material is combined with a die to form a pre-pressed solid body of the luggage rack end plate;

[0036] The blank pre-pressed entity is molded and then demoulded to obtain a finished luggage rack end plate.

[0037] In this embodiment, the luggage rack end plate is formed as follows: Figure 1 As shown, the luggage rack end plate itself is provided with a connecting hole to connect with the bracket, and the size of the connecting structure connected with the car body is relatively slender. When prepared by the preparation method provided in this embodiment, there is about 15% fluidity between the pre-pressed solid fibers of the blank, so that it can make up for certain defects during the molding process, and can form more complex structures, reduce the structural deformation and bubbles generated in the luggage rack end plate during the molding process, and the fiber content reaches 60-70%, which has good load-bearing performance while ensuring lightweight.

[0038] Furthermore, the large-tow forged composite material is prepared by compacting chopped unidirectional large-tow carbon fiber prepreg.

[0039] Furthermore, the large-tow forging composite material is prepared by compacting short-cut unidirectional large-tow carbon fiber prepreg, specifically: short-cut unidirectional large-tow carbon fiber prepreg tapes are selected for cutting, and the large-tow carbon fiber prepreg tapes are cut into rectangular short-cut prepreg narrow tapes; the short-cut prepreg narrow tapes are randomly laid and compacted to form the large-tow forging composite material and then rolled up.

[0040] Furthermore, the carbon fiber content of the large-tow forging composite material is greater than 60%, and the thickness is greater than 2 mm.

[0041] Furthermore, the large-tow forged composite material is cut according to the structural form of the luggage rack end plate, specifically: according to the structural form of the luggage rack end plate, the rolled large-tow forged composite material is cut to obtain paving material, and the paving material is paved on the luggage rack end plate.

[0042] Furthermore, the shape and size of the paving material are consistent with the shape and size of the luggage rack end plate.

[0043] Furthermore, the blanked large-tow forged composite material is combined with a die to form a pre-pressed entity of the luggage rack end plate, specifically:

[0044] The paving materials are laid on the mold in sequence to form a preliminary structural blank shape, and then the preliminary structural blank shape is pre-compacted to form a blank pre-compacted entity of the luggage rack end plate.

[0045] Furthermore, the demoulding of the pre-pressed blank entity after molding is specifically as follows:

[0046] The upper and lower molds are closed, and the molds are heated according to the curing conditions to achieve pre-compression of the blank entity by heating and pressurizing. After keeping warm for a period of time, the product molding is completed. After the product molding is completed, the upper and lower molds are demolded to take out the finished luggage rack end plate.

[0047] In a second aspect of the present invention, there is provided a luggage rack end plate obtained according to the above-mentioned method for preparing the large-tow forged composite luggage rack end plate.

[0048] In a third aspect of the present invention, a vehicle body is provided, comprising a high-speed railway luggage rack end plate obtained by the above-mentioned method for preparing the large-tow forged composite material high-speed railway luggage rack end plate.

[0049] The present invention provides a method for preparing a luggage rack end plate made of a large-tow forged composite material. The method uses a unidirectional large-tow prepreg to cut and randomly lay out a forging die material prepared therefrom, and uses the composite material to integrally form the luggage rack end plate. The method has the advantages of simple process, fast forming, and significant weight reduction. The obtained product has excellent mechanical properties and good bearing capacity. After forming, no machining is required, thereby improving the efficiency of production and manufacturing. In addition, the selected large-tow prepreg has a low cost.

[0050] The large-tow forged composite material provided by the present invention is prepared by slitting large-tow carbon fiber prepreg, and the preparation process is simple. Its thickness is ≥2mm. Compared with pure prepreg, the process laying time is greatly reduced. It only needs to be weighed and filled into the mold for molding, which improves production efficiency. There is about 15% fluidity between the pre-pressed solid fibers of the blank, so that it can make up for certain defects during the molding process, and can form more complex structures, reducing the structural deformation and bubbles generated in the luggage rack end plate during the molding process. The fiber content reaches 60-70%, ensuring lightweight while having good load-bearing performance.

[0051] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A method for preparing a large-tow forged composite luggage rack end plate, characterized in that: include: Preparation of large-tow forging composites; Cutting the large-tow forged composite material according to the structural form of the luggage rack end plate; The blanked large-tow forged composite material is combined with a die to form a pre-pressed solid body of the luggage rack end plate; The blank pre-pressed entity is molded and then demoulded to obtain a finished luggage rack end plate.

2. The method for preparing a large-tow forged composite luggage rack end plate according to claim 1, characterized in that: The large-tow forging composite material is prepared by compacting chopped unidirectional large-tow carbon fiber prepreg.

3. The method for preparing a large-tow forged composite luggage rack end plate according to claim 2, characterized in that: The large-tow forging composite material is prepared by compacting short-cut unidirectional large-tow carbon fiber prepreg, specifically, the short-cut unidirectional large-tow carbon fiber prepreg tape is selected for cutting, and the large-tow carbon fiber prepreg tape is cut into rectangular short-cut prepreg narrow tapes; the short-cut prepreg narrow tapes are randomly laid and compacted to form the large-tow forging composite material and then rolled up.

4. The method for preparing a large-tow forged composite luggage rack end plate according to claim 3, characterized in that: The large-tow forging composite material has a carbon fiber content greater than 60% and a thickness greater than 2 mm.

5. The method for preparing a large-tow forged composite luggage rack end plate according to claim 1, characterized in that: The large-tow forged composite material is cut according to the structural form of the luggage rack end plate, specifically: according to the structural form of the luggage rack end plate, the rolled large-tow forged composite material is cut to obtain paving materials, and the paving materials are paved on the luggage rack end plate.

6. The method for preparing a large-tow forged composite luggage rack end plate according to claim 5, characterized in that: The shape and size of the paving material are consistent with the shape and size of the luggage rack end plate.

7. The method for preparing a large-tow forged composite luggage rack end plate according to claim 1, characterized in that: The method of combining the blanked large-tow forged composite material with a die to form a blank pre-pressed entity of the luggage rack end plate is specifically as follows: The paving materials are laid on the mold in sequence to form a preliminary structural blank shape, and then the preliminary structural blank shape is pre-compacted to form a blank pre-compacted entity of the luggage rack end plate.

8. The method for preparing a large-tow forged composite luggage rack end plate according to claim 1, characterized in that: The demoulding of the pre-pressed blank entity after molding is specifically as follows: The upper and lower molds are closed, and the molds are heated according to the curing conditions to achieve pre-compression of the blank entity by heating and pressurizing. After keeping warm for a period of time, the product molding is completed. After the product molding is completed, the upper and lower molds are demolded to take out the finished luggage rack end plate.

9. A luggage rack end plate obtained according to the method for preparing a large-tow forged composite luggage rack end plate according to any one of claims 1 to 8.

10. A vehicle body, characterized in that: It comprises a high-speed rail luggage rack end plate obtained by the preparation method of a large-tow forged composite material high-speed rail luggage rack end plate according to any one of claims 1-8.

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