A method for manufacturing a composite material prepreg chain

Abstract

The application discloses a preparation method of a composite material prepreg chain, and comprises the following steps: S1, cutting of the prepreg; S2, separate lock ring forming, the prepreg is laid along the ring direction of the upper and lower molds until the cutting prepreg is completely laid and the consistency of the fiber direction is kept; S3, connecting lock ring forming, the prepreg is laid around the space in the formed separate lock ring by using the upper and lower and left and right four-part mold, and the connecting lock ring is formed with the continuity of the fiber; S4, repeating S2 and S3, the separate lock ring is formed first, then the connecting lock ring is formed, the separate lock rings are connected in sequence, and the composite material prepreg chain with the required length is obtained. In the chain forming process, the continuity of the fiber can be kept, the closed ring structure has high bearing capacity, the mold parting surface is simple, the mold is easy to process, easy to assemble and demold, and can be repeatedly used, and is suitable for continuous batch production.

Description

Technical Field

[0001] This invention relates to the field of composite material molding technology, and more specifically to a method for preparing a composite material prepreg chain. Background Technology

[0002] Chains are crucial components of lifting equipment. Traditional chains, made of metal, suffer from drawbacks such as high weight, susceptibility to corrosion, and short lifespan. In contrast, composite material chains offer significant advantages: their weight is only 1 / 4 to 1 / 5 that of metal chains, while possessing higher strength, fatigue resistance, and corrosion resistance. However, composite materials exhibit anisotropy, meaning they only achieve optimal mechanical properties when fiber continuity is maintained. Therefore, how to utilize the advantages of composite materials in chain fabrication while ensuring fiber continuity is a pressing technical challenge in this field. Summary of the Invention

[0003] In view of this, the present invention provides a method for preparing a composite prepreg chain, the purpose of which is to solve the problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A method for preparing a composite prepreg chain includes the following steps: S1, Prepreg cutting: Cutting the prepreg into elongated structures of appropriate length and width; S2, Individual Locking Ring Molding, specifically includes the following steps: S21, unfolding the cut prepreg in the first upper segment mold and the first lower segment mold respectively, laying the prepreg along the circumferential direction of the mold until the cut prepreg is completely laid out, while maintaining the consistency of the fiber direction; S22, closing and fastening the first upper segment mold and the first lower segment mold, and curing; S23, demolding to obtain an individual locking ring; S3, Connecting the locking ring forming, specifically includes the following steps: S31, placing the lower left and lower right segmented molds onto two separate locking rings respectively, and merging them to form the second lower segmented mold; S32, laying the cut prepreg circumferentially along the second lower segmented mold, the prepreg passing through the internal space of the separate locking rings and forming a loop on the second lower segmented mold to maintain fiber continuity; S33, placing the upper left and upper right segmented molds onto two separate locking rings respectively, and merging them to form the second upper segmented mold; S34, laying the cut prepreg circumferentially along the second upper segmented mold; S35, closing and securing the second upper and lower segmented molds, and curing them; S36, after demolding, a closed and continuous chain structure is obtained; S4. Repeat S2 and S3 in sequence to form individual locking rings first, then form connecting locking rings. Connect the individual locking rings in sequence to obtain the composite prepreg chain of the required length.

[0005] Preferably, in S1, the prepreg is cut using a cutting machine.

[0006] Preferably, in S1, the cutting width of the prepreg is 2-3 mm.

[0007] Preferably, in S1, the cutting length of the prepreg is calculated according to the following formula:

[0008] in, The cross-sectional area of ​​the locking ring is... The length of a single-loop locking ring. The thickness of a single layer of prepreg. This refers to the cutting width of the prepreg.

[0009] Preferably, during curing, the mold is first pushed into the curing oven, heated to 80°C, and kept at that temperature for 3 hours. After the heat preservation is completed, the mold is removed, and the mold is tightened again. The product is then heat-sealed to reduce air bubbles inside the product. After the heat-sealing is completed, the mold is pushed into the curing oven, heated to 120°C, and kept at that temperature for 4 hours. After curing is completed, the curing oven is allowed to cool naturally to room temperature. The mold is then removed and demolded.

[0010] The present invention achieves the following technical effects compared to the prior art: 1) In the process of connecting the locking ring, the present invention lays the prepreg through the internal space of the already formed individual locking ring, ensuring the continuity of the entire chain fibers. Combined with the overall closed ring structure of the chain, the fiber path is continuous when the load is transmitted between the chain links, which greatly improves the load-bearing capacity and structural safety of the chain.

[0011] 2) The present invention adopts a simple mold structure, which greatly reduces the processing difficulty and manufacturing cost of the mold. At the same time, the mold is sturdy and durable, and the mold closing and demolding operations are convenient and reusable, which simplifies the production process.

[0012] 3) This invention uses automated equipment to cut prepreg and lay it in a circumferential mold to form a shape. The process is controllable and suitable for large-scale mass production.

[0013] 4) The composite material chain prepared by this invention has a self-weight of only 1 / 4 to 1 / 5 of that of traditional metal chains. While achieving a significant reduction in weight, it also has excellent fatigue resistance and corrosion resistance, effectively solving the long-standing technical problems of metal chains being prone to rust, having a short lifespan, and being cumbersome to operate in lifting environments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall chain structure; Figure 2 This is the front view of the first upper segment mold; Figure 3 for Figure 2 Sectional view of AA; Figure 4 for Figure 2 Sectional view of BB; Figure 5 A schematic diagram showing the prepreg laid circumferentially in the first upper and lower segmented mold; Figure 6 This is a schematic diagram showing the mold-closing and solidification state of the first upper and lower segmented molds; Figure 7 This is a schematic diagram of the product after the individual locking rings have been demolded. Figure 8 This is a structural diagram of the lower left segmented mold, the lower right segmented mold, the upper left segmented mold, and the upper right segmented mold; Figure 9 A schematic diagram showing the lower left and lower right segmented molds fitted onto a separate locking ring and then joined together; Figure 10 A schematic diagram showing the impregnation material being formed by looping through the internal space of a separate locking ring; Figure 11 A schematic diagram showing the upper left and upper right segmented molds connected and formed in separate locking rings; Figure 12 This is a schematic diagram showing the closed and solidified state of the upper and lower molds connecting the locking ring. Figure 13 This is a schematic diagram of the closed continuous structure after the connecting locking ring is demolded; Figure 14 This is a schematic diagram of the overall structure after multiple chain sections are connected and formed. In the diagram: 1. Prepreg; 2. First upper segmenting mold; 3. First lower segmenting mold; 4. Lower left segmenting mold; 5. Lower right segmenting mold; 6. Upper left segmenting mold; 7. Upper right segmenting mold. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Example

[0017] Reference Figure 1-14As shown, this invention discloses a method for preparing a composite prepreg chain, comprising the following steps: S1, Prepreg 1 cutting: Prepreg 1 is cut into elongated structures of appropriate length and width; S2, Individual Locking Ring Molding, specifically includes the following steps: S21, unfolding the cut prepreg 1 in the first upper segment mold 2 and the first lower segment mold 3 respectively, laying the prepreg 1 along the circumferential direction of the mold until the cut prepreg 1 is completely laid out, while maintaining the consistency of the fiber direction; S22, closing and fastening the first upper segment mold 2 and the first lower segment mold 3, and curing; S23, demolding to obtain an individual locking ring; S3, Connecting the locking ring forming, specifically includes the following steps: S31, placing the lower left segment mold 4 and the lower right segment mold 5 onto the two individual locking rings respectively, and merging them to form the second lower segment mold; S32, laying the cut prepreg 1 circumferentially along the second lower segment mold, the prepreg 1 passing through the internal space of the individual locking rings and forming a loop on the second lower segment mold to maintain fiber continuity; S33, placing the upper left segment mold 6 and the upper right segment mold 7 onto the two individual locking rings respectively, and merging them to form the second upper segment mold; S34, laying the cut prepreg 1 circumferentially along the second upper segment mold; S35, closing and securing the second upper segment mold and the second lower segment mold, and then curing; S36, after demolding, a closed and continuous chain structure is obtained; S4. Repeat S2 and S3 in sequence to form individual locking rings first, then form connecting locking rings. Connect the individual locking rings in sequence to obtain the composite prepreg chain of the required length.

[0018] In this embodiment, in S1, the prepreg 1 is cut using a cutting machine.

[0019] In this embodiment, in S1, the cutting width of the prepreg 1 is 2-3 mm.

[0020] In this embodiment, in S1, the cutting length of the prepreg 1 is calculated according to the following formula:

[0021] in, The cross-sectional area of ​​the locking ring is... The length of a single-loop locking ring. The thickness of a single layer of prepreg. This refers to the cutting width of the prepreg.

[0022] In this embodiment, during curing, the mold is first pushed into the curing oven, heated to 80°C, and kept at that temperature for 3 hours. After the heat treatment is completed, the mold is removed, and the mold fasteners are tightened. The product is then heat-sealed to reduce air bubbles inside the product. After the heat treatment is completed, the mold is pushed into the curing oven, heated to 120°C, and kept at that temperature for 4 hours. After curing is completed, the curing oven is allowed to cool naturally to room temperature. The mold is then removed and demolded.

[0023] In this embodiment, the first upper segment mold 2 and the first lower segment mold 3 have the same structure.

[0024] In other embodiments, after demolding, it is necessary to polish the burrs on the product and the resin-rich layer on the surface.

[0025] In some other embodiments, the mold fastener is a bolt.

[0026] In some other embodiments, the prepreg 1 is made of polyacrylonitrile-based carbon fiber, epoxy resin and anhydride catalyst; wherein the glass transition temperature of the resin is 100°C.

[0027] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a composite prepreg chain, characterized in that, Includes the following steps: S1, Prepreg (1) Cutting: Cut the prepreg (1) into an elongated structure of appropriate length and width; S2, Individual locking ring forming, specifically includes the following steps: S21, unfold the cut prepreg (1) in the first upper segment mold (2) and the first lower segment mold (3) respectively, lay the prepreg (1) along the circumferential direction of the mold until the cut prepreg (1) is completely laid out, and maintain the consistency of the fiber direction; S22, close the first upper segment mold (2) and the first lower segment mold (3), tighten them, and cure them; S23, demold to obtain an individual locking ring; S3, connecting the locking ring forming, specifically including the following steps: S31, the lower left segment mold (4) and the lower right segment mold (5) are respectively placed on the two separate locking rings and merged to form the second lower segment mold; S32, the cut prepreg (1) is laid circumferentially along the second lower segment mold, and the prepreg (1) passes through the internal space of the separate locking ring and is formed in a circle on the second lower segment mold to maintain the continuity of the fiber; S33, the upper left segment mold (6) and the upper right segment mold (7) are respectively placed on the two separate locking rings and merged to form the second upper segment mold; S34, the cut prepreg (1) is laid circumferentially along the second upper segment mold; S35, the second upper segment mold and the second lower segment mold are closed, tightened, and cured; S36, after demolding, a closed and continuous chain structure is obtained; S4. Repeat S2 and S3 in sequence to form individual locking rings first, then form connecting locking rings. Connect the individual locking rings in sequence to obtain the composite prepreg chain of the required length.

2. The method for preparing a composite prepreg chain according to claim 1, characterized in that, In S1, the prepreg (1) is cut using a cutting machine.

3. The method for preparing a composite prepreg chain according to claim 1, characterized in that, In S1, the cutting width of the prepreg (1) is 2-3 mm.

4. The method for preparing a composite prepreg chain according to claim 1, characterized in that, In S1, the cutting length of the prepreg (1) is calculated according to the following formula: in, The cross-sectional area of ​​the locking ring is... The length of a single-loop locking ring. The thickness of a single layer of prepreg. This refers to the cutting width of the prepreg.

5. The method for preparing a composite prepreg chain according to claim 1, characterized in that, During curing, first push the mold into the curing oven, heat it to 80℃, and keep it at that temperature for 3 hours. After the heat is maintained, remove the mold, continue to tighten the mold, and continue to heat seal the product to reduce air bubbles inside the product. After heat sealing the mold, push the mold into the curing oven, heat it to 120℃, and keep it at that temperature for 4 hours. After curing, let the curing oven cool naturally to room temperature, remove the mold, and then demold.

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