Large-section multi-special-shaped-cavity pultrusion profile forming process method

Abstract

The invention discloses a large-section multi-special-shaped-cavity pultrusion sectional material forming process method, and belongs to the field of advanced composite material sectional material pultrusion forming. The process method is an advanced pultrusion profile forming method, creative improvement is carried out on a pultrusion forming mold by combining the process characteristics of pultrusion profiles, continuous reinforced fibers are guided out from a creel by applying tensile force, penetrate through a plurality of yarn penetrating plates and finally are soaked and mixed with liquid pultrusion resin in the mold, and the pultrusion profile is formed. And finally, a product with a specific section is formed by curing through a heated special mold, so that the product quality is improved, and rapid batch production of large complex structural parts is realized.

Description

Technical Field

[0001] The invention belongs to the field of advanced composite material profile pultrusion molding, and more particularly is a method for molding large-section multi-shaped cavity pultrusion profiles. Background Art

[0002] The composite material pultrusion process is an advanced production process, but the current composite material pultrusion process is mainly used to produce products with relatively simple cavity cross-sections, or indirectly produce multi-cavity products through a combination of monomers. It is still difficult to directly produce profiles with large cross-sections and multiple special-shaped cavities. Summary of the invention

[0003] The purpose of the present invention is to provide a pultrusion molding method for large-section multi-shaped cavity pultruded profiles, so as to solve the problems of the existing pultrusion molding process when producing large-section profiles, such as heat is difficult to transfer to the inside of the cavity, incomplete resin infiltration, and incomplete resin curing; and the problem of the existing pultrusion molding process when producing multi-shaped cavity profiles. The wall thickness is difficult to control.

[0004] The present invention adopts the following technical solutions to achieve the above technical effects:

[0005] A large-section multi-shaped cavity pultrusion profile forming process method specifically comprises the following steps:

[0006] Step 1, after the reinforcing roving and felt are drawn out from the creel, they are preliminarily arranged through a multi-layer yarn arrangement plate;

[0007] Step 2, after the reinforcing roving and felt are preformed by the preforming tooling, they are fully infiltrated with the liquid pultrusion resin in the impregnation area of ​​the mold to form the initial required cross-sectional shape;

[0008] Step 3, the reinforcing roving and felt fully infiltrated with the liquid pultrusion resin are passed through a molding area of ​​a heated mold, and the liquid pultrusion resin is solidified under the action of high temperature to form a continuous pultrusion profile with a fixed cross-section;

[0009] Step 4: The solidified pultruded profile is pulled to a cutting device and cut into required lengths.

[0010] Furthermore, in step 2, liquid pultrusion resin is injected into the mold cavity by a glue injection device, so that the liquid pultrusion resin fully infiltrates the surfaces of the reinforcing roving and the felt when the reinforcing roving and the felt pass through the mold cavity.

[0011] Furthermore, in step 1, the reinforcing roving and the felt are initially arranged through at least 4 layers of yarn arrangement plates.

[0012] Furthermore, the number of the special-shaped cavities is 5.

[0013] Furthermore, in step 2, the mold length is ≥1.3 meters, and includes 5 steel core molds and 1 set of steel outer molds. The cross-section of the steel core mold is the same as the cross-section of the internal cavity of the product, which is used to form the profile cavity. The cross-section of the outer mold is the same as the product shape to ensure the product shape.

[0014] Furthermore, the steel core mold includes four special-shaped core molds at four corners and a round core rod at the center; the round core rod is located at the center of the array of the four special-shaped core molds.

[0015] Furthermore, a hole is opened at the end of the central circular core rod for injecting liquid pultrusion resin, and the resin outlet is connected to the mold dipping area.

[0016] Furthermore, during the curing process of step 3, the special-shaped core mold is heated to increase the temperature in the mold cavity.

[0017] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0018] 1. This process method can produce multiple cavity products at one time, which has higher production efficiency compared with the previous process of combining single cavity products into multi-cavity products;

[0019] 2. Products formed by this process have fixed wall thickness in many places, which makes adjustment easier and product quality more stable.

[0020] 3. The products formed by this process method have better impregnation of the roving and felt, prevent the generation of dry fibers, and have better product quality.

[0021] 4. The cross-sectional shape of the product formed by this process method is regular and the resin is completely cured, which significantly improves the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 : It is a process flow chart of a large-section multi-shaped cavity pultrusion profile forming process method of the present invention.

[0023] Figure 2 : It is a schematic diagram of the structure of a large-section multi-shaped cavity pultruded profile of the present invention.

[0024] Figure 3 : It is a schematic diagram of the structure of the pultrusion profile forming die of the present invention.

[0025] Figure 4 :yes Figure 3 Schematic diagram of the structure from another perspective.

[0026] Figure 5 : It is a schematic diagram of the cross-section of other simple composite multi-cavity pultruded profiles. DETAILED DESCRIPTION

[0027] Below, the present invention is further described in conjunction with the accompanying drawings.

[0028] Combination Figure 1-5 , the present invention is further described below. The following examples can effectively enhance the understanding of the present invention by those skilled in the art. It should be noted that the application improvements made by those skilled in the art without departing from the present invention are all within the protection scope of the present invention.

[0029] A large-section multi-shaped cavity pultrusion profile forming process method, after the continuous reinforcing fiber is guided out from the creel by applying tension, it passes through multiple threading plates, and finally is infiltrated and mixed with liquid pultrusion resin inside the mold, and finally solidified through a heated special mold to form a product with a specific cross-section. The main steps are as follows:

[0030] S1: After the reinforcing roving and felt are drawn out from the creel, they are preliminarily arranged through a multi-layer yarn arrangement plate;

[0031] S2: After the reinforcing roving and felt pass through the preforming tooling, they are fully infiltrated with the liquid pultrusion resin in the mold dipping area to form the initial required cross-sectional shape;

[0032] S3: The reinforcing roving and felt fully impregnated with the liquid pultrusion resin pass through the heated mold forming area, and the liquid pultrusion resin is solidified under the action of high temperature to finally form a continuous fixed cross-section pultrusion profile;

[0033] S4: The solidified profile is transported to the automatic cutting equipment through the traction clamp and automatically cut into the required length.

[0034] The number of the special-shaped cavities is 5. S1 The reinforcing roving and the felt are preliminarily arranged through at least 4 layers of yarn arrangement plates.

[0035] The reinforcing roving and felt in S2 are fully impregnated with the liquid pultrusion resin in the mold dipping area, which means that the liquid pultrusion resin is injected into the mold cavity through the injection equipment, so that the liquid pultrusion resin is fully impregnated onto the surface of the reinforcing roving and felt when the reinforcing roving and felt pass through the mold cavity.

[0036] The mold length in S2 is ≥1.3 meters, including 5 steel core molds and 1 set of steel outer molds. The cross-section of the core mold is the same as the cross-section of the internal cavity of the product, which is used to form the profile cavity. The cross-section of the outer mold is the same as the product shape to ensure the product shape.

[0037] The 5 steel core molds are composed of four special-shaped core molds and a central round core rod. The special-shaped core molds on the four corners are connected at the tail end and the mold inlet, so that the wall thickness formed by the spacing of the four special-shaped core molds is fixed and does not need to be adjusted separately, which greatly facilitates the adjustment of wall thickness and ensures the stability of product wall thickness.

[0038] The end of the central circular core rod is opened to inject liquid pultrusion resin, and the resin outlet is in the mold dipping area. Ensure good infiltration of the reinforcing roving and felt on the central circular cavity. 8. The process method for forming large-section multi-shaped cavity pultrusion profiles as described in claim 1 is characterized by: the special mold cavity described in S3 is large, and the heat on the external heating plate cannot be well transferred to the central circular core rod area, so the special-shaped core molds on the four corners of the mold are used for heating to increase the mold temperature in the cavity and ensure that the liquid resin on the central circular cavity can be solidified and formed.

[0039] The profile fixture after traction and curing described in S4 adopts a polyurethane panel lined on a steel plate of sufficient thickness, which is completely fitted with the polyurethane panel profile and has a length of not less than 1000mm to increase friction.

[0040] Implementation examples:

[0041] This example is Figure 1 A large-section multi-shaped cavity pultruded profile structure is shown. On the pultrusion production line, reinforcing material yarn arrangement, resin impregnation, heating and curing, traction cutting and other operations are carried out. Specifically, the following steps are taken.

[0042] S1: After the reinforcing glass fiber and felt are drawn out from the creel, the reinforcing materials are preformed and arranged through 4 yarn arrangement plates;

[0043] After the S2 reinforcement roving and felt pass through the preforming tooling, they are fully infiltrated with the liquid pultrusion resin in the mold dipping area to form the initial required cross-sectional shape;

[0044] S3 The reinforcing roving and felt fully impregnated with the liquid pultrusion resin pass through the heated mold forming area, and the liquid pultrusion resin is solidified under the action of high temperature, and finally a continuous fixed-section pultrusion profile is formed;

[0045] The S4 cured profile is transported to the automatic cutting equipment through the traction clamp and automatically cut into the required length.

[0046] For the purpose of simplifying the description, the disclosure of technical details in the above-mentioned specific implementations may only reach the extent that those skilled in the art can decide on their own, that is, for the technical details not disclosed in the above-mentioned specific implementations, ordinary technicians in this field can completely complete them with the help of textbooks, reference books, papers, patents, audio-visual products and other published documents without any creative work, under the full prompts of the technical solution of this patent, or these details are the content that ordinary technicians in this field can decide on their own according to actual conditions under the common understanding. It can be seen that even if these technical details are not disclosed, it will not affect the sufficiency of the disclosure of the technical solution of this patent.

[0047] In short, based on the interpretation of the scope of protection of the claims by this patent specification, any specific implementation scheme that falls within the scope of the claims of this patent is within the scope of protection of this patent.

Claims

1. A large-section multi-shaped cavity pultrusion profile forming process, characterized in that: The specific steps include: Step 1, after the reinforcing roving and felt are drawn out from the creel, they are preliminarily arranged through a multi-layer yarn arrangement plate; Step 2, after the reinforcing roving and felt are preformed by the preforming tooling, they are fully infiltrated with the liquid pultrusion resin in the impregnation area of ​​the mold to form the initial required cross-sectional shape; Step 3, the reinforcing roving and felt fully infiltrated with the liquid pultrusion resin are passed through a molding area of ​​a heated mold, and the liquid pultrusion resin is solidified under the action of high temperature to form a continuous pultrusion profile with a fixed cross-section; Step 4: The solidified pultruded profile is pulled to a cutting device and cut into required lengths.

2. A large-section multi-shaped cavity pultrusion profile forming process according to claim 1, characterized in that: In step 2, liquid pultrusion resin is injected into the mold cavity by a glue injection device, so that the liquid pultrusion resin fully infiltrates the surfaces of the reinforcing roving and the felt when the reinforcing roving and the felt pass through the mold cavity.

3. The method for forming a large-section multi-shaped cavity pultrusion profile according to claim 1, characterized in that: In the step 1, the reinforcing roving and the felt are initially arranged through at least 4 layers of yarn arrangement plates.

4. The method for forming a large-section multi-shaped cavity pultrusion profile according to claim 1, characterized in that: The number of the special-shaped cavities is 5.

5. A large-section multi-shaped cavity pultrusion profile forming process according to claim 4, characterized in that: In step 2, the mold length is ≥1.3 meters, and it includes 5 steel core molds and 1 set of steel outer molds. The cross-section of the steel core mold is the same as the cross-section of the internal cavity of the product, which is used to form the profile cavity. The cross-section of the outer mold is the same as the product shape to ensure the product shape.

6. A large-section multi-shaped cavity pultrusion profile forming process according to claim 5, characterized in that: The steel core mold comprises four special-shaped core molds at four corners and a round core rod at the center; the round core rod is located at the center of the array of the four special-shaped core molds.

7. A large-section multi-shaped cavity pultrusion profile forming process according to claim 6, characterized in that: The hole at the end of the central circular core rod is used to inject liquid pultrusion resin, and the resin outlet is connected to the mold dipping area.

8. The method for forming a large-section multi-shaped cavity pultrusion profile according to claim 5, characterized in that: During the curing process of step 3, the special-shaped core mold is heated to increase the temperature in the mold cavity.

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