Composite material wrinkle elimination tooling and manufacturing device and method thereof

Abstract

The present invention provides a composite material wrinkle elimination tool and a manufacturing device and method thereof. The tool of the present invention comprises a shaping plate and a connecting belt arranged between the shaping plates; the shaping plates are arranged around the connecting belt in a closed manner, and both ends of the connecting belt are embedded in the shaping plates, and the surface of the connecting belt is coated with polysulfide sealant. The elimination tool and the manufacturing device and method of the present invention can better achieve a smooth transition of fabric layers at the intersection of multiple special-shaped surfaces, solve the problem of concentrated distribution of larger fabric wrinkles, reduce fiber breakage caused by subsequent grinding, improve product quality and stability, and facilitate mass production.

Description

Technical Field

[0001] The invention belongs to the field of glass fiber reinforced plastic manufacturing, and in particular relates to a composite material wrinkle eliminating tool and a manufacturing device and method thereof. Background Art

[0002] Fiber-reinforced resin-based composite materials have been gradually promoted and applied in the production of body shell structures due to their unique advantages of high specific strength, high specific stiffness, strong designability, good fatigue fracture resistance, corrosion resistance, stable structural dimensions and easy large-area integral forming.

[0003] For example, in the method for integrally forming a composite vehicle body disclosed in patent announcement number CN111559091A, the vehicle body shell mold has the characteristics of a large number of doors and windows, large curvature changes, many edges of irregular surfaces, and vertical depth. In addition, there are many layers of reinforcing fibers at the doors and windows, and it is difficult to smooth and conform the cloth layer, and to press it flat. The glass fiber cloth needs to be cut at different positions and angles of the doors and windows, and the overlap reinforcement is staggered at the cut. Affected by factors such as the adhesive moldability of the glass fiber cloth and the manual mounting technology, it is inevitable that the cloth layer at the splicing will be relatively thick and loose, and the layers will be suspended and accumulated layer by layer. Finally, when the vacuum is drawn, the glass fiber cloth slides down irregularly, and resin-rich surfaces appear in the irregular surface connection area. Raised wrinkles appear at the intersection of multiple irregular surfaces, which is a high-incidence area for wrinkles. Once formed, it can only be corrected and polished after solidification, which destroys the continuity of the fiber, and its overall performance will be discounted, which is not conducive to the stability of its structure and the guarantee of the mechanical properties of the product. If the window frame is not rigid enough, it will cause deformation, affecting the appearance gap and flatness; if the deformation is too large, it will affect the sealing of the sealing strip, causing noise and high-speed vibration problems. At the same time, the secondary operation adds various processes, increases the labor and costs, and brings many problems especially for mass production.

[0004] In view of this, it is urgent to propose a composite material wrinkle elimination tool and a manufacturing device and method thereof. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to provide a composite material wrinkle elimination tooling and a manufacturing device and method thereof, which can better achieve a smooth transition of fabric layers at the intersection of multiple special-shaped surfaces, solve the problem of concentrated distribution of larger fabric folds, reduce fiber breakage caused by subsequent grinding, improve product quality and stability, and facilitate mass production.

[0006] A composite material wrinkle elimination tool of the present invention comprises:

[0007] It includes shaping plates and connecting belts arranged between the shaping plates;

[0008] The shaping plate is enclosed around the connecting belt and both ends of the connecting belt are embedded in the shaping plate. The surface of the connecting belt is coated with polysulfide sealant.

[0009] Furthermore, the connecting belt has an arc transition portion.

[0010] Furthermore, the shaping plate is a glass fiber reinforced plastic plate.

[0011] The present invention also provides a manufacturing device for composite material wrinkle elimination tooling, which is suitable for manufacturing composite material wrinkle elimination tooling, and includes a composite material mold and a vacuum infusion auxiliary mechanism;

[0012] The composite material mold has a cavity suitable for manufacturing the shaped plate and a transition zone suitable for manufacturing the connecting belt;

[0013] The vacuum infusion auxiliary mechanism includes a demoulding cloth, a guide net, a guide tube, an exhaust pipe and a vacuum bag film. The demoulding cloth is laid on the cavity of the composite material mold; the guide net and the guide tube are laid on the demoulding cloth in sequence; the vacuum bag film is attached to the cavity of the composite material mold and connected to the sealing strips around the composite material mold. A plurality of exhaust pipes are arranged around the vacuum bag film, and the exhaust pipes are connected to the exhaust device; the guide tube is connected to the glue injection device.

[0014] The present invention also provides a method for manufacturing a composite material wrinkle elimination tool, which is suitable for manufacturing a composite material wrinkle elimination tool, comprising the following steps:

[0015] S1, surface treatment of the composite material mold;

[0016] S2, laying the composite material in the cavity of the composite material mold, laying the connecting belt in the transition zone of the composite material mold, and embedding the end of the connecting belt into the composite material;

[0017] S3, opening the vacuum device to extract the air in the vacuum bag film, and injecting the resin material into the composite material mold through the injection device;

[0018] S4, curing and molding to obtain composite material wrinkle elimination tooling.

[0019] Furthermore, the specific process of surface treatment of the composite material mold in step S1 is to grind and polish the surface of the composite material mold in sequence, and then apply a sealing agent, a mold cleaning agent, and a release agent on the surface of the composite material mold.

[0020] Furthermore, before the end of the connecting bag is embedded in the composite material, the method further includes performing a glue-blocking treatment on the connecting belt.

[0021] Furthermore, the glue blocking process includes the following steps:

[0022] S201, mixing white polysulfide sealant and black polysulfide sealant in a ratio of 100:10±2 to form a two-component polysulfide sealant;

[0023] S202, diluting the mixed two-component polysulfide sealant;

[0024] S203, evenly applying the diluted two-component polysulfide sealant to the arc transition portion of the connecting strip;

[0025] S204, vulcanizing the connecting belt.

[0026] Furthermore, the specific step of diluting the two-component polysulfide sealant in step S202 is to mix the two-component polysulfide sealant and the diluent in a ratio of 100:90±10.

[0027] Furthermore, the specific process of vulcanizing the connecting belt is to vulcanize it by natural drying in sunlight at room temperature.

[0028] The present invention also provides a composite material wrinkle elimination method, comprising the following steps:

[0029] S1a, surface treatment of composite material mold and composite material wrinkle elimination tooling;

[0030] S2a, laying a demoulding cloth on the surface of the composite material mold, and embedding the composite material wrinkle elimination tooling on the outside of the demoulding cloth;

[0031] S3a, laying the composite material in the cavity of the composite material mold;

[0032] S4a, opening the vacuum device to remove the air in the vacuum bag film, and injecting the resin material into the composite material mold through the injection device;

[0033] S5a, curing and molding to obtain a composite material product.

[0034] The above technical solution of the present invention has the following advantages compared with the prior art:

[0035] (1) The composite material wrinkle elimination tooling described in the present invention is nested in the depth position of the special-shaped part, which can better achieve a smooth transition of the fabric layer at the intersection of multiple special-shaped surfaces, solve the problem of concentrated distribution of larger fabric wrinkles, reduce fiber breakage caused by subsequent grinding, improve product quality and stability, and facilitate mass production.

[0036] (2) The plane area of ​​the composite material wrinkle elimination tooling described in the present invention is made of fiberglass, which is consistent with the material of the product, effectively avoiding the influence of asynchronous thermal expansion and contraction on the post-curing of the product; the rounded transition area uses a connecting belt with glue-resistant properties. The connecting belt has a certain elasticity and can be easily nested in the stretched state. In the contracted state, it can apply pressure to the cloth layer, thereby enhancing the fit between the cloth layer and the mold and reducing the resin-rich phenomenon.

[0037] (3) When the product of the present invention is demolded after curing, the product and the tooling can be removed together and then separated. The tooling can be reused. The tooling has a simple structure and low production cost. It is formed in one step using a vacuum infusion process, which can achieve rapid production and efficient installation of the tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a manufacturing device for composite material wrinkle elimination tooling provided in an embodiment of the present invention;

[0039] Figure 2 is a schematic structural diagram of a composite material wrinkle elimination tool provided in an embodiment of the present invention;

[0040] Among them, 1; composite material mold, 2; composite material; 3, transition zone; 4, demoulding cloth; 5, guide net; 6, vacuum bag film; 7, exhaust pipe; 8, exhaust device; 9, guide pipe; 10, glue injection device; 11, shaping plate; 12, connecting belt. DETAILED DESCRIPTION

[0041] 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.

[0042] This embodiment provides a composite material wrinkle elimination tool, such as Figure 2 As shown, it includes a shaping plate 11 and a connecting belt 12.

[0043] The shaping plate 11 and the connecting belt 12 are enclosed and arranged in a closed manner, and both ends of the connecting belt 12 are embedded in the shaping plate 11 . The connecting belt 12 has an arc transition portion, and the surface of the connecting belt 12 is coated with sulfur sealant to increase the toughness of the connecting belt 12 .

[0044] Furthermore, the shaping plate 11 is a glass fiber reinforced plastic plate, which is consistent with the material of the product, effectively avoiding the influence of asynchronous thermal expansion and contraction on the post-curing of the product; the rounded transition zone 3 uses a connecting belt 12 with glue-resistant properties. The connecting belt 12 has a certain elasticity and can be easily nested in a stretched state. In a contracted state, it can apply pressure to the cloth layer, thereby enhancing the solidity between the cloth layer and the mold and reducing the resin-rich phenomenon.

[0045] This embodiment also provides a manufacturing device for composite material wrinkle elimination tooling, which is suitable for manufacturing composite material wrinkle elimination tooling, such as Figure 1 As shown, it includes a composite material mold 1 and a vacuum infusion auxiliary mechanism;

[0046] The composite material mold 1 has a cavity suitable for manufacturing a shaping plate 11 and a transition zone 3 suitable for manufacturing a connecting belt 12; the vacuum infusion auxiliary mechanism includes a demoulding cloth 4, a guide net 5, a guide tube 9, an exhaust pipe 7 and a vacuum bag film 6, the demoulding cloth 4 is laid on the cavity of the composite material mold 1; the guide net 5 and the guide tube 9 are laid on the demoulding cloth 4 in sequence; the vacuum bag film 6 is attached to the cavity of the composite material mold 1 and connected to the sealing strips around the composite material mold 1, and a plurality of exhaust pipes 7 are arranged around the vacuum bag film 6, and the exhaust pipe 7 is connected to the exhaust device 8; the guide tube 9 is connected to the glue injection device 10.

[0047] This embodiment also provides a method for manufacturing a composite material wrinkle elimination tool, which is suitable for manufacturing a composite material wrinkle elimination tool and includes the following steps.

[0048] S1, performing surface treatment on the composite material mold 1. The surface of the composite material mold 1 is subjected to grinding and polishing steps in sequence, and then a sealing agent, a mold cleaning agent, and a mold release agent are applied to the surface of the composite material mold 1 for multiple times.

[0049] S2, laying the composite material 2 in the cavity of the composite material mold 1, laying the connecting belt 12 in the transition zone 3 of the composite material mold 1, and embedding the end of the connecting belt 12 into the composite material 2; before embedding the end of the connecting bag into the composite material 2, it also includes, performing glue-blocking treatment on the connecting belt 12.

[0050] S3, opening the vacuum device 8 to extract the air in the vacuum bag film 6, and injecting the resin material into the composite material mold 1 through the glue injection device 10;

[0051] S4, curing and molding to obtain composite material wrinkle elimination tooling.

[0052] Furthermore, the glue blocking treatment includes the following steps: S201, mixing white polysulfide sealant and black polysulfide sealant in a ratio of 100:10±2 to form a two-component polysulfide sealant.

[0053] S202, diluting the mixed two-component polysulfide sealant.

[0054] S203 , evenly apply the diluted two-component polysulfide sealant to the arc transition portion of the connecting belt 12 .

[0055] S204, vulcanizing the connecting belt 12.

[0056] Furthermore, the specific step of diluting the two-component polysulfide sealant in step S202 is to mix the two-component polysulfide sealant and the diluent in a ratio of 100:90±10.

[0057] Furthermore, the specific process of vulcanizing the connecting belt 12 is to vulcanize it by natural drying in sunlight at room temperature.

[0058] This embodiment also provides a method for eliminating wrinkles in a composite material, comprising the following steps:

[0059] S1a, performing surface treatment on the composite material mold 1 and the composite material wrinkle elimination tooling;

[0060] S2a, laying the demoulding cloth 4 on the surface of the composite material mold 1, and nesting the composite material wrinkle elimination tooling on the outside of the demoulding cloth 4; the nesting method is that the four corner connecting belts 12 of the cloth wrinkle elimination tooling have a certain elasticity, two people each hold two corners and evenly stretch them to increase their diameter, and buckle the cloth wrinkle elimination tooling from top to bottom to the specified position without contacting the demoulding cloth 4, loosen the cloth wrinkle elimination tooling, and nest the cloth wrinkle elimination tooling on the outside of the demoulding cloth 4 by the contraction force of the connecting belt 12.

[0061] S3a, laying the composite material 2 in the cavity of the composite material mold 1. In this embodiment, the composite material 2 is glass fiber. It should be noted that the composite material 2 includes but is not limited to glass fiber. In this embodiment, the composite material 2 is a mixture of glass fiber and carbon fiber. Those skilled in the art can also choose other materials as the composite material 2 according to actual conditions.

[0062] S4a, opening the exhaust device 8 to extract the air in the vacuum bag film 6, and injecting the resin material into the composite material mold 1 through the glue injection device 10;

[0063] S5a, curing and molding to obtain a composite material 2 product.

[0064] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for manufacturing a composite material wrinkle elimination tool, characterized in that: The steps include: S1, surface treatment of the composite material mold; S2, laying the composite material in the cavity of the composite material mold, laying the connecting belt in the transition zone of the composite material mold, and embedding the end of the connecting belt into the composite material; S3, opening the vacuum device to extract the air in the vacuum bag film, and injecting the resin material into the composite material mold through the injection device; S4, curing and molding to obtain a composite material wrinkle elimination tooling; The composite material wrinkle elimination tool comprises shaping plates and connecting belts arranged between the shaping plates; The shaping plate and the connecting belt are surrounded to form a closed structure, and both ends of the connecting belt are embedded in the shaping plate, and the surface of the connecting belt is coated with polysulfide sealant.

2. The method for manufacturing a composite material wrinkle elimination tool according to claim 1, characterized in that: The connecting strip has an arc transition portion.

3. The method for manufacturing a composite material wrinkle elimination tool according to claim 2, characterized in that: The specific process of surface treatment of the composite material mold in step S1 is to grind and polish the surface of the composite material mold in sequence, and then apply a sealing agent, a mold cleaning agent, and a release agent on the surface of the composite material mold.

4. The method for manufacturing a composite material wrinkle elimination tool according to claim 3, characterized in that: Before embedding the end of the connecting belt into the composite material, the method further includes performing a glue blocking treatment on the connecting belt.

5. The method for manufacturing a composite material wrinkle elimination tool according to claim 4, characterized in that: The glue blocking process comprises the following steps: S201, mixing white polysulfide sealant and black polysulfide sealant in a ratio of 100:10±2 to form a two-component polysulfide sealant; S202, diluting the mixed two-component polysulfide sealant; S203, evenly applying the diluted two-component polysulfide sealant to the arc transition portion of the connecting strip; S204, vulcanizing the connecting belt.

6. The method for manufacturing a composite material wrinkle elimination tool according to claim 5, characterized in that: The specific step of diluting the two-component polysulfide sealant in step S202 is to mix the two-component polysulfide sealant and the diluent in a ratio of 100:90±10.

7. The method for manufacturing a composite material wrinkle elimination tool according to claim 6, characterized in that: The specific process of vulcanizing the connecting belt is to vulcanize it by natural drying in sunlight at room temperature.

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