Composite multi-cavity profile pultrusion device

Abstract

The utility model provides a composite material multi-cavity profile pultrusion device, and belongs to the technical field of composite material pultrusion. The problems that an existing multi-cavity profile pultrusion forming process is large in pultrusion resistance, and a pre-forming tool is difficult to arrange are solved. The forming device comprises a plurality of bending core molds, a forming mold, first preforming tools and second preforming tools, each bending core mold comprises a gathering section and a bending section, the bending sections are bent in opposite directions, the gathering sections of the bending core molds are arranged at intervals, the first preforming tools are arranged on the bending sections, and the second preforming tools are arranged on the forming mold. The gathering section is provided with a second pre-forming tool, and a forming die is arranged behind the second pre-forming tool. The pultrusion device is mainly used for pultrusion of composite multi-cavity profiles.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite material pultrusion molding, in particular to a composite material multi-cavity profile pultrusion molding device. Background Art

[0002] With the rapid development and wide application of fiber reinforced material pultrusion process, the advantages of pultrusion process such as high automation, mechanization and the gradual popularization of products have gradually emerged. The fiber reinforced composite multi-cavity profile has been gradually widely used due to its excellent structural strength, overall stiffness and strong designability. However, in the pultrusion process of multi-cavity profiles (especially for full fabric or multi-fabric pultrusion), the pultrusion process still has excessive pultrusion resistance and difficult pre-forming tooling arrangement. The traditional threading plate method is used. The fabric is prone to form a large resistance when traveling in the threading plate, and it is easy to scratch the rounded corners of the threading plate during the movement of the fabric, resulting in the fabric being scratched and damaged at the threading plate, interrupting the pultrusion process. The use of felt guides requires high lateral space, and for most multi-cavity profiles, the distance between cavities is small, resulting in a limited distance between core molds and the inability to arrange felt guides.

[0003] Due to the above problems, the development of multi-cavity fabric profile pultrusion is limited. Multi-cavity pultruded profiles can only use more unidirectional fibers. Unidirectional fibers lead to low lateral strength of pultruded profiles. In order to ensure the overall stiffness of the profile, the cross-sectional size of the profile is enlarged, which usually affects the overall space share and weight reduction effect. Utility Model Content

[0004] In view of this, the utility model aims to provide a composite material multi-cavity profile pultrusion molding device to solve the problems of large pultrusion resistance and difficult preforming tooling arrangement in the existing multi-cavity profile pultrusion molding process.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a composite material multi-cavity profile pultrusion molding device, which includes a bending core mold, a molding die, a first preforming tooling and a second preforming tooling, the number of the bending core molds is multiple, the bending core mold includes a gathering section and a bending section, the multiple bending sections are bent in opposite directions, the gathering sections of the multiple bending core molds are arranged at intervals, each bending section is provided with a first preforming tooling, the gathering section is provided with a second preforming tooling, and a molding die is provided behind the second preforming tooling.

[0006] Furthermore, the bending core mold is provided with a plurality of ball grooves at the bending portion, and ball bearings are arranged in the ball grooves.

[0007] Furthermore, the bending core mold is provided with ball bearings on the inner surface and the outer surface of the bending portion.

[0008] Furthermore, the bending core mold is provided with a plurality of rollers on the gathering section.

[0009] Furthermore, a straight core mold is arranged between the bending core molds, and a first preforming tool is arranged on the straight core mold.

[0010] Furthermore, the molding die is provided with a glue injection area, a condensation area and a solidification area from the inlet end to the outlet end.

[0011] Furthermore, the glue injection area and the condensation area partially overlap.

[0012] Furthermore, a heating plate is provided in the curing area, and the heating plate is connected to a power plug.

[0013] Furthermore, a heat-insulating layer is arranged outside the solidification zone, a temperature measuring hole is opened on the heat-insulating layer, the heat-insulating layer is a split structure, and two heat-insulating layers of the split structure are connected by bolts.

[0014] The utility model also provides a forming method of a composite material multi-cavity profile pultrusion forming device, which is specifically as follows: a corresponding number of core molds are used according to the multi-cavity profile structure, and the core mold is a curved core mold or a curved core mold and a straight core mold are used in combination. The reinforcing material is gradually spread on the core mold through a yarn threading plate or a felt guide according to the product layer structure requirements, so that when it passes through the bending part, the cavity preform is completed. The reinforcing material is placed on the already formed cavity preform through a second preforming tool to complete the preform production and enter the inlet end of the molding die. The preform is pulled along the center line of the molding die in front of the molding die outlet, and resin is injected into the molding die injection part at the same time. Through the traction effect, the reinforcing material is continuously passed through the injection area and enters the molding die curing area to form a target product after curing.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: Compared with the traditional straight core mold, the bent core mold of the present invention is to retain the straight core mold inside the molding mold, and the bent core mold is used in the preforming process of the rear cavity. For example, in a double-cavity structure, the two core molds can be bent in opposite directions respectively, and in a three-cavity structure, the middle cavity core mold can be retained as a straight section, and the left and right cavities are bent in their respective directions, thereby increasing the operating space of the rear section. Compared with the original process, the present invention reduces the difficulty of pultrusion of a multi-cavity structure, reduces the pultrusion resistance during the product pultrusion process, increases the preforming layout space of the rear section of pultrusion, and improves the processability. The overall implementation process also greatly reduces the utilization rate of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0017] Figure 1 This is a schematic structural diagram of a composite material multi-cavity profile pultrusion molding device according to the utility model;

[0018] Figure 2 This is a schematic diagram of the bending core mold structure described in the utility model;

[0019] Figure 3 This is a schematic diagram of the three-dimensional connection structure between the core mold and the forming mold described in the utility model;

[0020] Figure 4 This is a schematic diagram of the planar connection structure between the core mold and the forming mold described in the utility model;

[0021] Figure 5 This is a schematic diagram of the molding die structure of the utility model;

[0022] Figure 6 It is a schematic diagram of the cross-sectional structure of the forming die described in the utility model;

[0023] Figure 7 This is a schematic diagram of the thermal insulation layer structure of the utility model;

[0024] Figure 8 This is a schematic diagram of the composite material multi-cavity profile structure described in the utility model.

[0025] In the figure: 1-bending core mold, 2-first preforming tooling, 3-straight core mold, 4-second preforming tooling, 5-forming mold, 6-ball groove, 7-roller, 8-inlet end, 9-glue injection area, 10-condensation area, 11-curing area, 12-outlet end, 13-temperature measuring hole, 14-insulation layer, 15-power plug, 16-bolt. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely explain the technical solutions in the embodiments of the utility model. It should be noted that the embodiments and features in the embodiments of the utility model can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.

[0027] See also Figure 1-8To illustrate the present embodiment, a composite material multi-cavity profile pultrusion molding device comprises a bending core mold 1, a molding die 5, a first preforming tool 2 and a second preforming tool 4, wherein the number of the bending core molds 1 is multiple, and the bending core mold 1 comprises a gathering section and a bending section, and the multiple bending sections are bent in opposite directions, and the gathering sections of the multiple bending core molds 1 are arranged at intervals, and each bending section is provided with a first preforming tool 2, and the gathering section is provided with a second preforming tool 4, and the molding die 5 is provided behind the second preforming tool 4.

[0028] The bending core mold 1 described in the embodiment is provided with a plurality of ball grooves 6 at the bend, and ball bearings are provided in the ball grooves 6. Ball bearings are provided on both the inner and outer surfaces of the bending core mold 1. The bending core mold 1 is provided with a plurality of rollers 7 on the gathering section. A straight core mold 3 is provided between the bending core molds 1, and a first preforming tooling 2 is provided on the straight core mold 3. The forming mold 5 is provided with a glue injection area 9, a condensation area 10 and a curing area 11 from the inlet end 8 to the outlet end 12, respectively. The glue injection area 9 and the condensation area 10 are partially overlapped. A heating plate is provided in the curing area 11, and the heating plate is connected to a power plug 15. An insulation layer 14 is provided outside the curing area 11, and a temperature measuring hole 13 is provided on the insulation layer 14. The insulation layer 14 is a split structure, and the two split insulation layers 14 are connected by bolts 16.

[0029] The present embodiment is a molding method of a composite material multi-cavity profile pultrusion molding device, which is specifically as follows: a corresponding number of core molds are used according to the multi-cavity profile structure, and the core mold is a curved core mold 1 or a curved core mold 1 and a straight core mold 3. The reinforcing material is gradually spread on the core mold according to the product layer structure requirements through a first preforming tool 2 through a yarn threading plate or a felt guide, so that when it passes through the bend, the cavity preform is completed. The reinforcing material is placed on the already formed cavity preform through a second preforming tool 4 to complete the preform production and enter the inlet end 8 of the molding die 5. The preform is pulled along the center line of the molding die 5 in front of the outlet of the molding die 5, and resin is injected into the injection part of the molding die 5 at the same time. Through the traction effect, the reinforcing material continuously passes through the injection area and enters the curing area of ​​the molding die to form a target product after curing.

[0030] The pultrusion process is mainly divided into the following steps according to the molding process: the reinforcing material (fiber) is formed into a preform in the shape of a target product through a preforming tool; the preform enters the molding die, is infiltrated with resin and is cured by heating; at the front end of the molding die, the solidified product inside the molding die is pulled out of the mold by traction to form a product.

[0031] For the multi-cavity profile forming process of fiber-reinforced composite materials, the original straight core mold pultrusion process is changed, the pultrusion preforming tooling space is increased, and the original multi-cavity profile straight core mold pultrusion forming method is changed. The problems such as insufficient layout space caused by the reinforcement material passing through the preforming tooling stage, resulting in poor preform forming effect and poor preform covering effect on the core mold, affect product quality.

[0032] by Figure 8 Taking the three-cavity profile structure shown as an example, individual cavity profiles are produced in advance through the pultrusion process. After the profile is formed, the cavity profile is used as the core mold of the overall product, and the core mold follow-up method is adopted. During the outer layer felt wrapping process, the preform core mold moves with the fabric (fiber) during the pultrusion process and enters the molding mold 5 to solidify and form a whole.

[0033] The overall process is as follows:

[0034] 1. Core mold design: analysis Figure 8 The profile structure shown adopts a bending core mold 1. In order to ensure the operating space between the cavities and reduce the pultrusion resistance, balls and rollers 7 are placed on the bending core mold 1 to change the static friction of the fabric on the bending core mold 1 into rolling friction.

[0035] 2. Molding mold design: Molding mold 5 according to Figure 8 The cross-sectional dimensions of the profile shown are designed in Figure 8 On the profile shown, a glue injection area 9, a condensation area 10 and a curing area 11 are respectively arranged from the inlet end 8 to the outlet end 12.

[0036] 3. Preform tooling design: The main function of the preform tooling in the pultrusion process is to convert the reinforcing material (fiber, fabric) from its original form to form a preform in the shape of the product. The preform gradually slides on the core mold into the molding mold 5 as the traction in the direction of the outlet of the molding mold 5 is applied, and can smoothly enter the molding mold 5 for injection, curing and molding. In this way, the reinforcing material is made into a preform in the shape of the product. The overall molding mold is as follows: Figure 1 shown.

[0037] 4. Make the cavity preform: according to the product layer structure requirements, the reinforcing material (fiber, fabric) is gradually laid on the core mold through the first preforming tool 2 through the yarn threading plate or the felt guide, so that the cavity preform is made when it passes through the bend. In the process of forming the preform, since the core mold has been completely covered, when it passes through the bend, the preform is easy to spread due to the change of curvature. At this time, before the preform reaches the bend, a line with a certain strength and capable of forming an impregnation effect with the molding resin (such as aramid fiber, organic line, etc.) can be used to circumferentially wrap each core mold to form a restrained state.

[0038] 5. Making the outer layer preform: After the three cavities are completely formed into a preform and pass through the bending section, the preform needs to be completed. At this time, a second preform tooling 4 is arranged between the convergence of the three core molds and the entrance of the forming mold 5, and the reinforcing material is formed here on the three cavities that have formed partial preforms and enters the entrance of the forming mold 5.

[0039] 6. Mold heating: The mold is heated to the required temperature for resin curing in the curing area through the heating plate. Because the heating method is open heating, the heating plate is designed as an enclosing heating method to ensure heating efficiency.

[0040] 7. Start production: When the temperature of the molding die 5 reaches the required temperature, the preform is pulled along the center line of the molding die 5 in front of the molding die 5 outlet, and resin is injected into the molding die 5 injection area at the same time. Through the pulling effect, the reinforcing material is continuously passed through the injection area and enters the molding die 5 curing area. After curing, the target product is formed and pulled out of the molding die outlet. In order to prevent the fabric from being blocked due to the different paths on both sides of the fabric caused by the bending section, ball bearings can be embedded in the bending section to change the static friction between the fabric and the core mold into rolling friction, thereby reducing the travel resistance. Since the fabric opening with a coating effect is easily formed due to the change of curvature in the bending section, wires and fibers with a certain strength and capable of being impregnated with resin (such as organic wires, aramid, glass fibers, etc.) can be used to form a circumferential winding on the outer layer before the coating effect is formed and the bending section is not reached to form a restraint.

[0041] In the above embodiment, the bending core mold 1 can also be bent up and down according to the product structure. To ensure the molding space, the bending form can be bent multiple times to expand the space, and the preforming tooling can use a yarn plate structure or a felt guide to form a preformed body with the reinforcement material.

[0042] The embodiments of the utility model disclosed above are only used to help explain the utility model. The embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model.

Claims

1. A composite material multi-cavity profile pultrusion molding device, characterized in that: It comprises a bending core mold (1), a forming mold (5), a first preforming tool (2) and a second preforming tool (4), wherein the number of the bending core molds (1) is multiple, the bending core mold (1) comprises a gathering section and a bending section, the multiple bending sections are bent in opposite directions, the gathering sections of the multiple bending core molds (1) are arranged at intervals, each bending section is provided with a first preforming tool (2), the gathering section is provided with a second preforming tool (4), and the forming mold (5) is provided behind the second preforming tool (4).

2. A composite material multi-cavity profile pultrusion molding device according to claim 1, characterized in that: The bending core mold (1) is provided with a plurality of ball grooves (6) at the bending portion, and ball bearings are arranged in the ball grooves (6).

3. A composite material multi-cavity profile pultrusion molding device according to claim 2, characterized in that: The bending core mold (1) is provided with ball bearings on the inner surface and the outer surface of the bending part.

4. A composite material multi-cavity profile pultrusion molding device according to claim 1, characterized in that: The bending core mold (1) is provided with a plurality of rollers (7) on the gathering section.

5. The composite material multi-cavity profile pultrusion molding device according to claim 1, characterized in that: A straight core mold (3) is arranged between the curved core molds (1), and a first preforming tool (2) is arranged on the straight core mold (3).

6. A composite material multi-cavity profile pultrusion molding device according to claim 1, characterized in that: The molding die (5) is respectively provided with a glue injection area (9), a condensation area (10) and a solidification area (11) from the inlet end (8) to the outlet end (12).

7. A composite material multi-cavity profile pultrusion molding device according to claim 6, characterized in that: The glue injection area (9) and the condensation area (10) partially overlap.

8. The composite material multi-cavity profile pultrusion molding device according to claim 6, characterized in that: A heating plate is provided in the curing area (11), and the heating plate is connected to a power plug (15).

9. A composite material multi-cavity profile pultrusion molding device according to claim 6, characterized in that: A heat-insulating layer (14) is arranged outside the solidification zone (11), and a temperature measuring hole (13) is opened on the heat-insulating layer (14).

10. A composite material multi-cavity profile pultrusion molding device according to claim 9, characterized in that: The thermal insulation layer (14) is a split structure, and two thermal insulation layers (14) of the split structure are connected by bolts (16).

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