Dipping mold for fiber reinforced composite material

Abstract

The utility model relates to the technical field of injection molds, in particular to a dipping mold for a fiber reinforced composite material, which comprises a first mold plate, a second mold plate and a forming cavity arranged between the first mold plate and the second mold plate, the forming cavity comprises a feed port, a plurality of mold cavities and a discharge port, fibers enter from the feeding port, bypass the impregnation module and are discharged from the discharging port, the forming cavity is further communicated with a feeding port used for feeding resin melt, and the impregnation module which rotates to adjust tension is arranged in the mold cavity. According to the dipping mold for the fiber reinforced composite material, the dipping module in each mold cavity can rotate to adjust the tension applied to the fiber in the mold cavity, so that the poor dipping effect caused by too small tension and too small contact area of the fiber and a resin melt is avoided, and meanwhile, the fiber breakage caused by too large tension is avoided; therefore, the product impregnation effect is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, and more specifically, to an impregnation mold for fiber-reinforced composite materials. Background Technique

[0002] Continuous fiber-reinforced thermoplastic resin composite material is a kind of reinforced composite material with unidirectional fiber arrangement and the same length as the resin particle length, which is prepared by using a special impregnation device to make continuous fibers fully contact and impregnate with the molten thermoplastic resin. The thermoplastic resin is evenly distributed between the fibers, playing the role of fixing the fibers and transmitting the load. Compared with short fiber-reinforced thermoplastic resin, long fiber-reinforced thermoplastic resin has the characteristics of high strength, good impact resistance, stable size and outstanding heat resistance, and is widely used in the fields of automobiles, aerospace, electronic appliances, mechanical equipment, ordnance industry, building materials, furniture and sports appliances, etc.

[0003] Chinese Patent CN105014994A discloses a molten impregnation device for continuous fiber-reinforced thermoplastic resin composite materials, including a toothed structure, a non-contact impregnation module, a contact tension roller and a non-contact roller. The continuous fiber bundle enters from the fiber inlet, passes through the toothed structure to obtain pre-dispersion; the dispersed continuous fiber bundle passes through a group of non-contact impregnation modules, then alternately bypasses the contact tension roller, and finally passes through a group of non-contact rollers. At the same time, the molten thermoplastic polymer is extruded into the molten impregnation mold through the interface of the extruder connecting device, so that the continuous fiber bundle and the molten thermoplastic polymer are melt-impregnated. In the above solution, the setting of the tension roller can increase the tension of the long fibers to help the dispersion and full impregnation of the long fibers. However, in the above solution, the tension of the fiber bundle cannot be adjusted, and the dispersion effect of the fiber bundle in the impregnation mold is poor, resulting in a poor impregnation effect. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide an impregnation mold for fiber-reinforced composite materials, which can adjust the fiber tension, thereby effectively improving the impregnation effect of the product.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] Provide an impregnation mold for fiber-reinforced composite materials, including a first template, a second template and a forming cavity arranged between the first template and the second template. The forming cavity includes a feed port, a plurality of mold cavities and a discharge port which are communicated. The fiber enters from the feed port, bypasses the impregnation module and discharges from the discharge port. The forming cavity is also communicated with a feed port for feeding the resin melt, and an impregnation module for adjusting the tension by rotating is arranged in the mold cavity.

[0007] In the impregnation die for fiber-reinforced composite materials of the utility model, the fibers enter from the feed port, bypass the periphery of each impregnation module, and are drawn out from the discharge port after being impregnated with the resin melt in the mold cavity; the resin melt is fed into the mold cavity from the feed port, and impregnates the fibers in the mold cavity, thereby obtaining a composite material product. In the utility model, each impregnation module in the mold cavity can be rotated to adjust the tension of the fibers in the mold cavity, so as to avoid too small tension, too small contact area between the fibers and the resin melt, resulting in poor impregnation effect, and at the same time avoid too large tension causing fiber breakage; thereby effectively improving the impregnation effect of the product.

[0008] Further, the impregnation module is an elliptical cylinder roller, the first template and the second template are connected with side guards, the elliptical cylinder roller is rotatably connected to the side guards through a rotating shaft, and the center of the elliptical cylinder roller coincides with the center of the mold cavity. The first template, the second template and the side guards are connected around to form a mold, and the setting of the side guards facilitates the rotation setting of the elliptical cylinder roller.

[0009] Furthermore, the first template is provided with a plurality of first corrugated surfaces, the second template is provided with a plurality of second corrugated surfaces symmetrically arranged with the first corrugated surfaces, and a plurality of the mold cavities are formed between the first corrugated surfaces and the second corrugated surfaces; the distance between the first corrugated surface and the second corrugated surface of each mold cavity first gradually increases and then gradually decreases. The minimum distance between the first corrugated surface and the second corrugated surface is D1, and the maximum distance between the first corrugated surface and the second corrugated surface is D2. Along the direction from the feed port to the discharge port, the distance between the first corrugated surface and the second corrugated surface gradually increases from D1 to D2, and then gradually decreases from D2 to D1; the mold cavity with this arc surface setting allows the continuously accumulated resin melt fed from the melt feed port to flow along the arc surface to both ends, thereby increasing the area of ​​fiber impregnation and improving the impregnation effect.

[0010] Furthermore, the minor axis diameter of the elliptical roller is greater than the minimum distance between the first corrugated surface and the second corrugated surface, and the major axis diameter of the elliptical roller is less than the maximum distance between the first corrugated surface and the second corrugated surface. The fibers in the mold cavity are staggered around the lower end surface of the first corrugated surface and the upper surface of the elliptical roller, or staggered around the upper end surface of the second corrugated surface and the lower surface of the elliptical roller. The rotation of the elliptical roller is used to change the impregnation angle of the fiber to adjust the tension of the fiber. The fiber bundle is mainly divided into two parts, one part staggered around the lower end surface of the first corrugated surface and the upper surface of the elliptical roller, and the other part staggered around the upper end surface of the second corrugated surface and the lower surface of the elliptical roller. The fibers will not stagger with each other, thereby helping to improve the impregnation effect.

[0011] Furthermore, a controller is included, the rotating shaft is connected to a driving motor, and the driving motor is connected to an output end of the controller. Automatic control of the driving motor by the controller can help achieve automatic adjustment of the tension.

[0012] Furthermore, the tension exerted on the fiber by the first impregnation module in the die cavity and the tension exerted on the fiber by the last impregnation module in the die cavity are less than the tension exerted on the fiber by any impregnation module at the intermediate position. The tension exerted on the fiber by the first impregnation module in the die cavity is not greater than the tension exerted on the fiber by the last impregnation module in the die cavity. When the fiber enters the die in the first die cavity, it is not easy to break under the action of a small tension. In the last die cavity, since the fiber has been impregnated with a part of the resin melt in the die cavity before the last die cavity, a smaller tension can be used in the last die cavity to achieve uniform impregnation.

[0013] Furthermore, the number of the die cavities is 2N - 1, where N≥2 and N is a positive integer; the tensions exerted on the fiber by the impregnation modules in each die cavity are denoted as F1, F2... F N 、F N+1 ……F 2N-1 , then, F1 < F2 < F3 <... < F N ,F 2N-1 < F 2N-2 < F 2N-3 <……< F N 。 From the first die cavity to the last die cavity, the tension first gradually increases and then gradually decreases, and the magnitude of the tension gradually changes, so that a better impregnation effect can be obtained.

[0014] Furthermore, each of the die cavities is communicatively provided with a feeding port, the axis of the feeding port passes through the center of the die cavity, and the axis of the feeding port is perpendicular to the axes of the feeding port and the discharging port. Each die cavity is provided with a feeding port, and the resin melt is fed from different positions. The multi-stage feeding and repeated impregnation of the fiber can achieve better coating of the resin melt on the fiber and obtain a better impregnation effect.

[0015] Furthermore, it further includes a controller, a flow valve is provided at the feeding port, and the flow valve is connected to the output end of the controller. By controlling the opening degree of the flow valve through the controller, the flow rate of each feeding port can be controlled, which helps to realize the automatic adjustment of the feeding flow rate.

[0016] Furthermore, the feeding flow rate of the feeding port of the first die cavity and the feeding flow rate of the feeding port of the last die cavity are greater than the feeding flow rate of the feeding port of any die cavity at the intermediate position. In the last cavity, since the fiber has been impregnated with a part of the resin melt in the cavity before the last cavity, a smaller feeding flow rate can be used in the last cavity to achieve uniform impregnation.

[0017] Compared with the prior art, the beneficial effects of the present utility model are:

[0018] For the impregnation die for fiber-reinforced composite materials of the present utility model, the tension on the fiber in each die cavity is adjustable, which avoids the situation that the tension is too small, the contact area between the fiber and the resin melt is too small, resulting in poor impregnation effect, and at the same time avoids the fiber breakage caused by too large tension. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the impregnation mold for fiber-reinforced composites in the first embodiment;

[0020] Figure 2 It is an installation schematic diagram of the impregnation module of the impregnation mold for fiber-reinforced composites in the first embodiment;

[0021] Figure 3 It is a schematic structural diagram of the impregnation mold for fiber-reinforced composites in the second embodiment;

[0022] Figure 4 It is a control schematic diagram of the controller in the third embodiment;

[0023] In the drawings: 1. First template; 2. Second template; 3. Feed inlet; 4. Discharge outlet; 5. Mold cavity; 6. Impregnation module; 7. Feeding port; 8. First corrugated surface; 9. Second corrugated surface; 10. Side baffle; 11. Rotating shaft; 12. Identification module; 13. Controller; 14. Driving motor. Detailed Embodiments

[0024] The following further describes the present utility model in conjunction with the detailed embodiments. Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0025] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] Embodiment 1

[0027] As Figure 1The figure shows an embodiment of an impregnation mold for a fiber-reinforced composite material of the utility model, comprising a first template 1, a second template 2 and a molding cavity arranged between the first template 1 and the second template 2, wherein the molding cavity comprises a feed port 3, a plurality of mold cavities 5 and a discharge port 4 which are connected and arranged, wherein the fiber enters from the feed port 3 and bypasses the impregnation module 6 and is discharged from the discharge port 4, wherein the molding cavity is also connected and provided with a feed port 7 for feeding a resin melt, wherein the mold cavity 5 is provided with an impregnation module 6 which rotates to adjust the tension, as shown in FIG. Figure 1 shown.

[0028] When this embodiment is implemented, the fiber enters from the feed port 3, bypasses the outer periphery of each impregnation module 6, and is impregnated with the resin melt in the mold cavity 5 before being led out from the discharge port 4; the resin melt is fed into the mold cavity 5 from the feed port 7, and impregnates the fiber in the mold cavity 5, thereby obtaining a composite material product. When this embodiment is implemented, the impregnation module 6 in each mold cavity 5 can be rotated to adjust the tension of the fiber in the mold cavity 5, so as to avoid too small tension, too small contact area between the fiber and the resin melt, resulting in poor impregnation effect, and to avoid too large tension causing fiber breakage.

[0029] Among them, the fiber is pulled by the pulling device so that the fiber enters from the feed port 3, bypasses the outer periphery of each impregnation module 6, and is led out from the discharge port 4. The pulling device provides power for the movement of the fiber. The fiber bypasses each impregnation module 6 in a manner that bypasses the upper surface of each impregnation module 6, bypasses the lower surface of each impregnation module 6, or bypasses the upper surface and the lower surface of each impregnation module 6 in sequence and alternately. The fiber bypasses each impregnation module 6 in a manner that bypasses the upper surface of each impregnation module 6, or bypasses the lower surface of each impregnation module 6, and it is necessary to assist with the tensioning roller to achieve the tensioning of the fiber. The impregnation module 6 can be an elliptical roller, an eccentric roller, a special-shaped roller, etc., and the distance between the center point of the impregnation module 6 and the contact point between the fiber and the impregnation module 6 changes during the rotation process. The greater the distance between the center point of the impregnation module 6 and the contact point between the fiber and the impregnation module 6, the greater the tension, and the smaller the distance between the center point of the impregnation module 6 and the contact point between the fiber and the impregnation module 6, the smaller the tension; the fiber can be specifically glass fiber, carbon fiber and other fibers, and the resin is a thermoplastic resin.

[0030] In this embodiment, the impregnation module 6 is an elliptical cylinder roller, the first template 1 and the second template 2 are connected with a side stop 10, the elliptical cylinder roller is rotatably connected to the side stop 10 through a rotating shaft, and the center of the elliptical cylinder roller coincides with the center of the mold cavity 5. Figure 2 The first template 1, the second template 2 and the side guard 10 are connected and surrounded to form a mold, and the setting of the side guard 10 facilitates the rotation setting of the elliptical cylinder roller. The surface of the elliptical cylinder roller is smooth. During the rotation process, the immersion angle of the elliptical cylinder roller changes, and the tension changes, which is conducive to the adjustment of the tension.

[0031] In addition, in this embodiment, the tension generated by the impregnation module 6 on the fiber in the first cavity 5 and the tension generated by the impregnation module 6 on the fiber in the last cavity 5 are less than the tension generated by any impregnation module 6 on the fiber at the intermediate position. The tension generated by the impregnation module 6 on the fiber in the first cavity 5 is not greater than the tension generated by the impregnation module 6 on the fiber in the last cavity 5. When the fiber enters the mold in the first cavity 5, it is not easy to break under the action of small tension. In the last cavity 5, since the fiber in the cavity 5 before the last cavity 5 has been impregnated with part of the resin melt, a smaller tension can be used in the last cavity 5 to achieve uniform impregnation. Specifically, in this embodiment, the number of the cavities 5 is 2N - 1, where N ≥ 2 and N is a positive integer. The tensions generated by the impregnation modules 6 in each cavity 5 on the fiber are denoted as F1, F2... F N 、F N+1 ……F 2N-1 , then, F1 < F2 < F3 <... < F N ,F 2N-1 < F 2N-2 < F 2N-3 <... < F N . From the first cavity 5 to the last cavity 5, the tension first gradually increases and then gradually decreases, and the tension changes gradually, so that a better impregnation effect can be obtained.

[0032] Embodiment Two

[0033] This embodiment is the second embodiment of the present utility model. This embodiment is similar to Embodiment One, except that the first template 1 is provided with a plurality of first corrugated surfaces 8, the second template 2 is provided with a plurality of second corrugated surfaces 9 symmetrically arranged with the first corrugated surfaces 8, and a plurality of the cavities 5 are formed between the first corrugated surfaces 8 and the second corrugated surfaces 9; the distance between the first corrugated surface 8 and the second corrugated surface 9 of each cavity 5 first gradually increases and then gradually decreases, as shown in Figure 3 . The minimum distance between the first corrugated surface 8 and the second corrugated surface 9 is D1, and the maximum distance between the first corrugated surface 8 and the second corrugated surface 9 is D2. Along the direction from the feed port 3 to the discharge port 4, the distance between the first corrugated surface 8 and the second corrugated surface 9 gradually increases from D1 to D2, and then gradually decreases from D2 to D1; such an arc-shaped cavity 5 enables the continuously accumulating resin melt fed from the melt feed port 7 to flow along the arc surface towards both ends, increasing the area of impregnation of the fiber and improving the impregnation effect.

[0034] Among them, in this embodiment, the minor axis diameter of the elliptical cylindrical roller is greater than the minimum distance between the first corrugated surface 8 and the second corrugated surface 9, and the major axis diameter of the elliptical cylindrical roller is less than the maximum distance between the first corrugated surface 8 and the second corrugated surface 9. The fibers stagger around the lower end surface of the first corrugated surface 8 and the upper surface of the elliptical cylindrical roller, or stagger around the upper end surface of the second corrugated surface 9 and the lower surface of the elliptical cylindrical roller within the die cavity 5. By using the rotation of the elliptical cylindrical roller to change the impregnation angle of the fibers to adjust the tension on the fibers, the fiber bundle is mainly divided into two parts. One part staggers around the lower end surface of the first corrugated surface 8 and the upper surface of the elliptical cylindrical roller, and the other part staggers around the upper end surface of the second corrugated surface 9 and the lower surface of the elliptical cylindrical roller. The fibers will not be intertwined with each other, thus helping to improve the impregnation effect.

[0035] In addition, in this embodiment, the feed inlet 3 is a flared opening that is large first and then small, and the discharge outlet 4 is a flared opening that is small first and then large. The fibers enter through the feed inlet 3 and pass through the narrowest part between the first corrugated surface 8 and the second corrugated surface 9. The lower end surface of the first corrugated surface 8 and the upper end surface of the second corrugated surface 9 squeeze the fibers, causing the fiber path to change; the flared opening at the discharge outlet 4 has a stable buffering effect on the impregnated product, helping to improve the quality of the impregnated product.

[0036] When this embodiment is implemented, the rotation of the elliptical cylindrical roller can change the horizontal passing path of the fibers, thereby realizing the pressure action of the first corrugated surface 8, the second corrugated surface 9, and the elliptical cylindrical roller on the fibers. When the elliptical cylindrical roller is rotated, the pressure on the fibers can be changed. Since the degree of unfolding of the single filaments of the fiber bundle is different, different impregnation effects can be achieved; thus, the fiber bundle in this embodiment is divided into two parts: one part staggers around the lower end surface of the first corrugated surface 8 and the upper surface of the elliptical cylindrical roller to form a first fiber surface, and the other part staggers around the upper end surface of the second corrugated surface 9 and the lower surface of the elliptical cylindrical roller to form a second fiber surface. The fibers in the two fiber surfaces will not be intertwined with each other, which can help to improve the impregnation effect.

[0037] Embodiment Three

[0038] An embodiment of the impregnation mold for fiber-reinforced composites of the present utility model. This embodiment is similar to Embodiment One, except that each die cavity 5 is communicatively provided with a feeding port 7. The axis of the feeding port 7 passes through the center of the die cavity 5, and the axis of the feeding port 7 is perpendicular to the axes of the feed inlet 3 and the discharge outlet 4, as Figure 3 shown. Each die cavity 5 is provided with a feeding port 7, and the resin melt is fed from different positions. Multiple-stage feeding and repeated impregnation of the fibers achieve better coating of the resin melt on the fibers, obtaining a better impregnation effect.

[0039] Since the fiber surface includes a first fiber surface and a second fiber surface, in this embodiment, two sets of feeding ports 7 are connected to the same mold cavity 5. The axes of the two feeding ports 7 of the same mold cavity 5 coincide, the axis of the feeding port 7 passes through the center of the mold cavity 5, and the axis of the feeding port 7 is perpendicular to the axis of the feeding port 3. The resin melt fed into the multiple feeding ports 7 at the top, part of it flows onto the first fiber surface, part of it is carried by the fiber into the next mold cavity 5 for impregnation, part of it flows to the rear end area of the impregnation, maximizing the contact area between the melt and the fiber, and there is also part of the resin melt that passes through the first fiber surface and falls through the gap onto the second fiber surface to achieve the impregnation of the fiber on the second fiber surface; the resin melt fed into the multiple feeding ports 7 at the bottom, part of it flows onto the second fiber surface, part of it is carried by the fiber into the next mold cavity 5 for impregnation, part of it flows to the rear end area of the impregnation, maximizing the contact area between the melt and the fiber, and there is also part of the resin melt that passes through the second fiber surface and flows through the gap to the first fiber surface to achieve the impregnation of the fiber on the first fiber surface. Thus, the impregnation area of the resin melt on the fiber can be increased, and the impregnation effect can be improved.

[0040] In this embodiment, the feeding flow rate of the feeding port 7 of the first mold cavity 5 and the feeding flow rate of the feeding port 7 of the last mold cavity 5 are greater than the feeding flow rate of the feeding port 7 of any mold cavity 5 in the middle position. In the last cavity, since the fiber has been impregnated with part of the resin melt in the cavities before the last cavity, a smaller feeding flow rate can be used in the last cavity to achieve uniform impregnation. Specifically, in this embodiment, the number of mold cavities 5 is 2N - 1, where N≥2 and N is a positive integer; the tension generated by the impregnation module 6 on the fiber in each mold cavity 5 is denoted as F1, F2……F N 、F N+1 ……F 2N-1 ,then, F1, F2……F N 、F N+1 ……F 2N-1 ,then, F1 < F2 < F3 < …… < F N ,F 2N-1 <F 2N-2 <F 2N-3 <……<F N ; the feeding flow rate in each mold cavity 5 is denoted as Q1, Q2……Q N 、Q N+1 ……Q 2N-1 ,then, Q1 > Q2 > Q3 > …… > Q N ,Q 2N-1 >Q 2N-2 >Q 2N-3 >……>Q N . From the first mold cavity 5 to the last mold cavity 5, the tension first gradually increases and then gradually decreases, the feeding flow rate first gradually decreases and then gradually increases, both the tension magnitude and the feeding flow rate change gradually, and the change trends of the tension magnitude and the feeding flow rate are opposite. The two factors cooperate with each other to obtain a better impregnation effect.

[0041] Embodiment 4

[0042] This embodiment is similar to the second embodiment, except that it further includes a controller 13, the shaft is connected to a drive motor 14, and the drive motor 14 is connected to the output end of the controller 13; the automatic control of the drive motor 14 by the controller 13 can help to achieve automatic adjustment of the tension. The drive motor 14 can be a drive motor 14 with a button, and the dipping angle of the dipping module 6 can be adjusted by pressing the button. This operation can be adjusted based on the experience of the operator.

[0043] In this embodiment, a flow valve is provided at the feeding port 7, and the flow valve is connected to the output end of the controller 13. The controller 13 controls the opening of the flow valve, thereby controlling the flow of each feeding port 7, which can help to achieve automatic adjustment of the feeding flow.

[0044] In this embodiment, the recognition module 12 can be set to automatically recognize the surface morphology of the product. The recognition module 12 is connected to the input end of the controller 13. Figure 4 As shown. The recognition module 12 recognizes the surface morphology of the product. For products with problems such as white leakage on the side, pelletizing explosion, and excessive glass fiber hair, the recognition module 12 can specifically use image recognition; if it is recognized that there are bad morphologies such as white leakage on the side, pelletizing explosion, and excessive glass fiber hair, a signal is transmitted to the controller 13, and the controller 13 improves the impregnation effect by adjusting the tension and feed amount, thereby achieving real-time adjustment of the tension. However, it should be noted that no matter how the tension and feed flow are adjusted, the following rules must still be met: The tension generated by the impregnation module 6 on the fiber in each cavity 5 meets the following rules: F1 <F2<F3<……<F N , F 2N-1 <F 2N-2 <F 2N-3 <…… <F N The feeding flow rate in each cavity 5 satisfies the following rule: Q1>Q2>Q3>……>Q N , Q 2N-1 >Q 2N-2 >Q 2N-3 >……>Q N .

[0045] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill 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 enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. An impregnation mold for fiber-reinforced composite materials, characterized in that, It includes a first template (1), a second template (2), and a forming cavity disposed between the first template (1) and the second template (2). The forming cavity includes a feed inlet (3), a plurality of mold cavities (5), and a discharge outlet (4) that are connected in communication. The fiber enters from the feed inlet (3), bypasses the impregnation module (6), and discharges from the discharge outlet (4). The forming cavity is also connected in communication with a feed port (7) for feeding a resin melt, and an impregnation module (6) for adjusting the tension by rotation is provided in the mold cavity (5).

2. The impregnation mold for fiber-reinforced composite materials according to claim 1, characterized in that, The impregnation module (6) is an elliptical cylindrical roller. Side baffles (10) are connected to the first template (1) and the second template (2). The elliptical cylindrical roller is rotatably connected to the side baffles (10) through a rotating shaft, and the center of the elliptical cylindrical roller coincides with the center of the mold cavity (5).

3. The impregnation mold for fiber-reinforced composite materials according to claim 2, characterized in that, The first template (1) is provided with a plurality of first corrugated surfaces (8), the second template (2) is provided with a plurality of second corrugated surfaces (9) symmetrically arranged with respect to the first corrugated surfaces (8), and a plurality of the mold cavities (5) are formed between the first corrugated surfaces (8) and the second corrugated surfaces (9); the distance between the first corrugated surface (8) and the second corrugated surface (9) of each mold cavity (5) gradually increases first and then gradually decreases.

4. The impregnation mold for fiber-reinforced composite materials according to claim 3, characterized in that, The minor axis diameter of the elliptical cylindrical roller is greater than the minimum distance between the first corrugated surface (8) and the second corrugated surface (9), and the major axis diameter of the elliptical cylindrical roller is less than the maximum distance between the first corrugated surface (8) and the second corrugated surface (9). The fiber alternately bypasses the lower end surface of the first corrugated surface (8) and the upper surface of the elliptical cylindrical roller, or alternately bypasses the upper end surface of the second corrugated surface (9) and the lower surface of the elliptical cylindrical roller in the mold cavity (5).

5. The impregnation mold for fiber-reinforced composite materials according to claim 2, characterized in that, It further includes a controller (13). The rotating shaft is connected to a driving motor (14), and the driving motor (14) is connected to the output end of the controller (13).

6. The impregnation mold for fiber reinforced composite materials according to claim 1, characterized in that, The tension generated by the impregnation module (6) on the fiber in the first mold cavity (5) and the tension generated by the impregnation module (6) on the fiber in the last mold cavity (5) are less than the tension generated by any impregnation module (6) on the fiber at the intermediate position, and the tension generated by the impregnation module (6) on the fiber in the first mold cavity (5) is not greater than the tension generated by the impregnation module (6) on the fiber in the last mold cavity (5).

7. The impregnation mold for fiber-reinforced composite materials according to claim 6, characterized in that, The number of the mold cavities (5) is 2N - 1, where N ≥ 2 and N is a positive integer; the tensions generated by the impregnation modules (6) on the fibers in each mold cavity (5) are denoted as F1, F2... F N , F N+1 ... F 2N-1 , then, F1 < F2 < F3 <... < F N , F 2N-1 < F 2N-2 < F 2N-3 <... < F N .

8. The impregnation mold for fiber-reinforced composite materials according to any one of claims 1 to 7, characterized in that, Each mold cavity (5) is connected in communication with a feed port (7). The axis of the feed port (7) passes through the center of the mold cavity (5), and the axis of the feed port (7) is perpendicular to the axes of the feed inlet (3) and the discharge outlet (4).

9. The impregnation mold for fiber reinforced composite materials according to claim 8, characterized in that, It further includes a controller (13). A flow valve is provided at the feed port (7), and the flow valve is connected to the output end of the controller (13).

10. The impregnation mold for fiber-reinforced composite materials according to claim 8, characterized in that, The feeding flow rate of the feed port (7) of the first mold cavity (5) and the feeding flow rate of the feed port (7) of the last mold cavity (5) are greater than the feeding flow rate of the feed port (7) of any mold cavity (5) at the intermediate position.

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