Universal pressure-adjustable fiber composite material liquid forming method

Abstract

The invention relates to the technical field of liquid forming, in particular to a universal pressure-adjustable fiber composite material liquid forming method which comprises the following steps: during preparation of a fiber composite material, firstly preparing a fiber preform, then adjusting the pressure of an environment where the prepared fiber preform is located to a preset value, and then conveying resin adhesive into the fiber preform; due to the fact that the pressure of the environment where the fiber prefabricated body is located is in the preset value state, the multiple layers of fiber boards in the fiber prefabricated body are in the extruded state, and the pressure of the environment where the fiber prefabricated body is located can exceed 10 standard atmospheric pressures at most; and the higher net compaction force can ensure that the infiltrated fiberboard does not have larger expansion when the resin adhesive infiltrates the multilayer fiberboard, so that the method can ensure the forming quality of the product and can obtain a composite material product with higher fiber volume content at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid molding, and particularly relates to a general pressure-adjustable fiber composite liquid molding method. Background Art

[0002] In the field of liquid molding of fiber composites, there are currently two main die forms and their corresponding processes. Among them, the fully closed die adopts the method of mating male and female dies. With a certain pressure in the closed die cavity, it promotes the liquid resin to penetrate and infiltrate the dry fibers under the pressure gradient, and then cures and forms under the action of a specific temperature and pressure. Resin transfer molding (RTM) and its derivative methods such as high-pressure resin transfer molding (HPRTM), high-pressure - compression resin transfer molding (HP-CRTM), thermal expansion soft film assisted resin transfer molding (TERTM), etc. all belong to this category.

[0003] The single-sided die process is to wrap and seal the fiber-reinforced preform with a flexible vacuum bag film on a single-sided die, and use vacuum negative pressure to exhaust the gas in the die cavity and drive the resin to flow to infiltrate the preform. This single-sided die process has relatively low cost, but it is difficult to guarantee the product quality and uniformity. For example, in the prior art, the Chinese authorized invention patent with the authorization announcement number CN100548644C discloses a controlled atmospheric pressure resin impregnation method, which controls the resin impregnation pressure difference by reducing the pressure of the resin feed tank to below atmospheric pressure during resin injection. After repeated compaction, pressure injection is then controlled, so that the net compaction force of the preform during resin infiltration is about 0.5 atm. However, this method is limited by resin injection in the atmospheric environment, the ultimate net compaction force of the preform does not exceed 1 atm, and because the resin infiltration is related to the pressure gradient, the actual ultimate net compaction force is much less than 1 atm, resulting in an upper limit for the fiber volume fraction of the final part and being unable to meet some application scenarios with high requirements for material performance. With the continuous improvement of the performance requirements of fiber composites in various industries, the demand for the existing single-sided die resin infusion process is increasing, yet the preparation efficiency and quality of the existing single-sided die resin infusion process are difficult to guarantee. Summary of the Invention

[0004] The present invention provides a general pressure-adjustable fiber composite liquid molding method to solve the problems that the preparation efficiency and quality of the existing single-sided die resin infusion process are difficult to guarantee.

[0005] The following technical scheme is adopted for a general pressure-adjustable fiber composite liquid molding method of the present invention:

[0006] A general pressure-adjustable fiber composite liquid molding method includes the following steps:

[0007] S1. Prepare a fiber preform; the fiber preform includes multiple layers of fiber boards, a mold, a demolding layer, and a sealing layer; the multiple layers of fiber boards are placed on the mold, the demolding layer is placed above the multiple layers of fiber boards, and the sealing layer is disposed outside the demolding layer, and the sealing layer is used to prevent the multiple layers of fiber boards from contacting the external environment;

[0008] S2. Adjust the pressure of the environment where the fiber preform is located to a preset value;

[0009] S3. Deliver resin glue into the sealing layer;

[0010] S4. Cure under preset temperature and preset pressure conditions.

[0011] Further, the fiber preform further includes an isolation layer and a diversion layer. The isolation layer is disposed inside the sealing layer and is used to prevent the resin glue from directly contacting the sealing layer; the diversion layer is disposed between the isolation layer and the demolding layer, and the resin glue can pass through both the diversion layer and the demolding layer, and the diversion layer is used to guide the resin glue to infiltrate the multiple layers of fiber boards.

[0012] Further, when adjusting the pressure of the environment where the fiber preform is located to a preset value, it includes a autoclave; the autoclave has a first accommodation cavity inside, the fiber preform can be placed in the first accommodation cavity, and the pressure inside the first accommodation cavity can be adjusted.

[0013] Further, when adjusting the pressure of the environment where the fiber preform is located to a preset value, it includes a pressure hood and a first pump body; the pressure hood includes a bottom plate and a fastening cover, the bottom plate and the fastening cover can enclose a relatively airtight second accommodation cavity, the first pump body is used to adjust the air pressure inside the second accommodation cavity, and the fiber preform can be placed in the second accommodation cavity.

[0014] Further, when delivering resin glue into the sealing layer, it includes a glue injection machine and an air extractor; the glue injection machine has a glue outlet pipe that penetrates through the autoclave or the bottom plate; one end of the glue outlet pipe is disposed between the isolation layer and the diversion layer; the air extractor has an air extraction pipe that penetrates through the autoclave or the bottom plate; one end of the air extraction pipe is disposed between the isolation layer and the diversion layer, wherein the air extraction pipe and the glue outlet pipe are disposed on both sides of the fiber board.

[0015] Further, a buffer tank is disposed on the air extraction pipe, and the buffer tank is used to prevent the resin glue from entering the air extractor through the air extraction pipe.

[0016] Further, the glue injection machine includes a glue storage tank, a pressure supply pump, and a stirring member. The inside of the glue storage tank is hollow, and resin glue is stored inside the glue storage tank. The pressure supply pump is used to supply pressure to the inside of the glue storage tank, and one end of the glue outlet pipe extends to the inside of the glue storage tank. The stirring member is used to stir the resin glue inside the glue storage tank.

[0017] Further, the glue injection machine further includes a negative pressure machine, which is used to extract the pressure inside the glue storage tank, and the negative pressure machine and the pressure supply pump are started alternately.

[0018] Further, a heating wire is arranged on the glue storage tank, and the heating wire is used to heat the resin glue stored inside the glue storage tank.

[0019] Further, a heating sleeve is arranged on the glue outlet pipe.

[0020] The beneficial effects of the present invention are as follows: For a general pressure-adjustable liquid molding method of fiber composite materials in the present invention, when preparing fiber composite materials, first prepare a fiber preform, then adjust the pressure of the environment where the prepared fiber preform is located to a preset value, and then transport resin glue into the fiber preform. Since the pressure of the environment where the fiber preform is located is in a state of the preset value, the multi-layer fiber boards inside the fiber preform are in a state of being extruded. The pressure of the environment where the fiber preform is located can exceed 10 standard atmospheric pressures at most. And during the molding process, a higher net compaction force can ensure that when the resin glue infiltrates the multi-layer fiber boards, the infiltrated fiber boards will not expand greatly. Therefore, this method can ensure the molding quality of the workpiece while obtaining a composite material workpiece with a higher fiber volume content. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a flowchart of a general pressure-adjustable liquid molding method of fiber composite materials provided by an embodiment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of a fiber preform in a general pressure-adjustable liquid molding method of fiber composite materials provided by an embodiment of the present invention;

[0024] Figure 3Schematic diagram of the structure when the fiber preform is placed in an autoclave in a general pressure-adjustable fiber composite liquid molding method provided by an embodiment of the present invention;

[0025] Figure 4 Schematic diagram of the structure when the fiber preform is placed in a pressure cover in a general pressure-adjustable fiber composite liquid molding method provided by an embodiment of the present invention;

[0026] Figure 5 Schematic diagram of the structure of a glue injection machine in a general pressure-adjustable fiber composite liquid molding method provided by an embodiment of the present invention.

[0027] In the figure: 110, mold; 120, vacuum tape; 130, demolding layer; 140, air extraction pipe; 141, first section; 142, second section; 150, fiber board; 160, flow guiding layer; 170, sealing layer; 180, isolation layer; 190, glue outlet pipe; 210, autoclave; 220, pressure cover; 221, bottom plate; 222, buckling cover; 230, buffer tank; 240, glue storage tank; 250, pressure supply pump; 260, stirring fan blade; 270, stirring motor; 280, negative pressure machine; 290, air extractor; 310, heating wire; 320, heating sleeve; 330, first pump body. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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, and therefore cannot be understood as a limitation to the present invention.

[0030] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0031] As Figures 1 to 5 shown, a general pressure-adjustable fiber composite liquid molding method provided by an embodiment of the present invention includes the following steps:

[0032] S1. Prepare a fiber preform; the fiber preform includes multiple layers of fiber boards 150, a mold 110, a demolding layer 130 and a sealing layer 170; when preparing the fiber composite, first prepare the fiber preform, prepare the corresponding mold 110 according to requirements, place the mold 110 horizontally, stack multiple layers of fiber boards 150 on the upper surface of the mold 110, place the demolding layer 130 above the multiple layers of fiber boards 150, set the sealing layer 170 outside the demolding layer 130, and connect the sealing layer 170 and the mold 110 in a sealed manner. The sealing layer 170 is a vacuum bag, and the vacuum bag and the mold 110 are connected through a vacuum tape 120 to ensure the sealing between the vacuum bag and the mold 110. The vacuum bag is used to prevent the multiple layers of fiber boards 150 from contacting the external environment. By providing the demolding layer 130, it is possible to prevent the vacuum bag from directly contacting the fiber board 150. Among them, the overall formed by the mold 110, the multiple layers of fiber boards 150, the demolding layer 130 and the sealing layer 170 is the fiber preform.

[0033] S2. Adjust the pressure of the environment where the fiber preform is located to a preset value. Among them, the preset value is a parameter set by a person, and the maximum value of the preset value is the pressure of 10 standard atmospheres. When the environment where the fiber preform is located is at the preset pressure, since the vacuum bag can prevent the multiple layers of fiber boards 150 from contacting the external environment, the preset environmental pressure squeezes the vacuum bag, so that the multiple layers of fiber boards 150 inside the vacuum bag are squeezed.

[0034] S3. Deliver resin glue into the sealing layer 170. When delivering resin glue into the sealing layer 170, the multi-layer fiber board 150 is in a compressed state. The resin glue can fill the entire inside of the sealing layer 170. A higher net pressing force can ensure that when the resin glue infiltrates the multi-layer fiber board 150, the infiltrated fiber board 150 will not expand significantly. After the resin glue cures, adjust the pressure of the environment where the fiber preform is located to the state of standard atmospheric pressure, detach the demolding layer 130 and the sealing layer 170 of the fiber preform from the mold 110, and cut and polish the fiber board 150 to the required size.

[0035] S4. Cure under preset temperature and preset pressure conditions. Specifically, the preset temperature and preset pressure need to be manually selected according to the type of resin glue selected to ensure the stable performance of the cured resin glue.

[0036] A general pressure-adjustable fiber composite liquid molding method of the present invention. When preparing a fiber composite material, first prepare a fiber preform, and then adjust the pressure of the environment where the prepared fiber preform is located to a preset value. Subsequently, deliver resin glue into the fiber preform. Since the pressure of the environment where the fiber preform is located is in a state of preset value, the multi-layer fiber board 150 inside the fiber preform is in a compressed state. The pressure of the environment where the fiber preform is located can exceed the pressure of 10 standard atmospheric pressures at most. And during the molding process, a higher net pressing force can ensure that when the resin glue infiltrates the multi-layer fiber board 150, the infiltrated fiber board 150 will not expand significantly. Therefore, this method can ensure the molding quality of the workpiece while obtaining a composite workpiece with a higher fiber volume content.

[0037] In one embodiment, the fiber preform further includes an isolation layer 180 and a diversion layer 160. The isolation layer 180 is arranged inside the sealing layer 170. The isolation layer 180 is used to prevent the resin glue from directly contacting the sealing layer 170. The diversion layer 160 is arranged between the isolation layer 180 and the demolding layer 130. The resin glue can pass through both the diversion layer 160 and the demolding layer 130. The diversion layer 160 is used to guide the resin glue to infiltrate the multi-layer fiber board 150. Specifically, in the fiber preform, from the outside to the inside are the sealing layer 170, the isolation layer 180, the diversion layer 160, the demolding layer 130, the fiber board 150, and the mold 110. The conveying member is used to deliver resin glue between the isolation layer 180 and the diversion layer 160. The resin glue cannot pass through the isolation layer 180. The resin glue can pass through the diversion layer 160 and the demolding layer 130, so that the resin glue fills the entire inside of the fiber board 150 without escaping to the outside of the sealing layer 170. At the same time, by setting the diversion layer 160, the resin glue can be guided to infiltrate the multi-layer fiber board 150.

[0038] In one embodiment, adjusting the pressure of the environment where the fiber preform is located to a preset value includes an autoclave 210; the autoclave 210 has a first accommodation cavity inside, and the pressure inside the first accommodation cavity of the autoclave 210 is adjustable. Specifically, the pressure inside the first accommodation cavity can reach 10 standard atmospheres, and the fiber preform can be placed inside the first accommodation cavity. When the fiber preform is placed inside the first accommodation cavity, the pressure inside the first accommodation cavity can squeeze the fiber preform, so that the space inside the sealing layer 170 is squeezed, and the multi-layer fiber board 150 bears a certain static pressure. When the resin glue infiltrates the multi-layer fiber board 150, the infiltrated fiber board 150 will not expand greatly.

[0039] In one embodiment, adjusting the pressure of the environment where the fiber preform is located to a preset value includes a pressure hood 220 and a first pump body 330; the pressure hood 220 includes a bottom plate 221 and a buckling hood 222. The bottom plate 221 is horizontally arranged, and the buckling hood 222 is slightly arc-shaped. The buckling hood 222 and the bottom plate 221 can enclose a relatively airtight second accommodation cavity. The first pump body 330 is used to adjust the air pressure inside the second accommodation cavity. The first pump body 330 can adjust the air pressure inside the second accommodation cavity to 10 standard atmospheres. The fiber preform can be placed inside the second accommodation cavity. Under the action of the pressure inside the second accommodation cavity, the fiber preform placed inside the second accommodation cavity can be squeezed, so that the space inside the sealing layer 170 is squeezed, and the multi-layer fiber board 150 bears a certain static pressure. When the resin glue infiltrates the multi-layer fiber board 150, the infiltrated fiber board 150 will not expand greatly.

[0040] In one embodiment, when delivering resin glue into the sealing layer 170, it includes a glue injector and an air extractor 290; the glue injector has a glue outlet pipe 190, and the glue outlet pipe 190 penetrates through the autoclave 210 or the bottom plate 221, so that one end of the glue outlet pipe 190 extends into the first accommodation cavity or the second accommodation cavity. One end of the glue outlet pipe 190 is arranged between the isolation layer 180 and the diversion layer 160, and the glue injector can inject resin glue between the isolation layer 180 and the diversion layer 160 through the glue outlet pipe 190. The air extractor 290 has an air extraction pipe 140, and the air extraction pipe 140 penetrates through the autoclave 210 or the bottom plate 221, so that one end of the air extraction pipe 140 extends into the first accommodation cavity or the second accommodation cavity. One end of the air extraction pipe 140 is arranged between the isolation layer 180 and the diversion layer 160. Among them, the air extraction pipe 140 and the glue outlet pipe 190 are arranged on both sides of the fiber board 150. When delivering resin glue into the fiber preform, the air extractor 290 and the glue injector are started simultaneously. The resin glue discharged from the glue outlet pipe 190 infiltrates all the fiber boards 150 under the action of the air extractor 290. At the same time, under the combined action of the air extractor 290 and the glue injector, the pressure borne by the multi-layer fiber board 150 is further increased, so that the multi-layer fiber board 150 will not expand greatly when being infiltrated by the resin glue.

[0041] In one embodiment, a buffer tank 230 is provided on the air extraction pipe 140. The buffer tank 230 is used to prevent the resin glue from entering the inside of the air extractor 290 through the air extraction pipe 140. Specifically, the buffer tank 230 has a buffer cavity inside. The air extraction pipe 140 is divided into a first section 141 and a second section 142. One end of the first section 141 is arranged at the lower part of the buffer cavity, the other end of the first section 141 is arranged between the isolation layer 180 and the diversion layer 160, one end of the second section 142 is connected to the air extractor 290, and the other end of the second section 142 is arranged at the upper part of the buffer cavity. By providing the buffer tank 230, the probability of the resin glue entering the inside of the air extractor 290 through the air extraction pipe 140 is reduced.

[0042] In one embodiment, the glue injection machine includes a glue storage tank 240, a pressure supply pump 250 and a stirring member. The glue storage tank 240 is hollow inside, the chamber inside the glue storage tank 240 is relatively airtight, and the resin glue is stored inside the glue storage tank 240. The pressure supply pump 250 is used to supply pressure to the inside of the glue storage tank 240. One end of the glue outlet pipe 190 extends into the glue storage tank 240, and one end of the glue outlet pipe 190 is always below the liquid level of the resin glue. When the pressure supply pump 250 supplies pressure to the inside of the glue storage tank 240, the resin glue inside the glue storage tank 240 can flow out through the glue outlet pipe 190, so that the resin glue enters between the isolation layer 180 and the diversion layer 160. The stirring member is used to stir the resin glue inside the glue storage tank 240. Specifically, the stirring member includes a stirring fan blade 260 and a stirring motor 270. The stirring motor 270 is fixedly connected to the glue storage tank 240, the power output shaft of the stirring motor 270 is arranged vertically, the stirring fan blade 260 is arranged on the power output shaft of the stirring motor 270, and the stirring fan blade 260 can be driven to rotate inside the glue storage tank 240. The stirring fan blade 260 stirs the resin glue in the stirring tank during the rotation process.

[0043] In one embodiment, the glue injection machine further includes a negative pressure machine 280. The negative pressure machine 280 is used to extract the pressure inside the glue storage tank 240, and the negative pressure machine 280 and the pressure supply pump 250 are started alternately. Specifically, when the negative pressure machine 280 is started, the pressure inside the glue storage tank 240 decreases. If there are bubbles in the resin glue inside the glue storage tank 240, during the process of the pressure inside the glue storage tank 240 decreasing, the bubbles inside the glue storage tank 240 gradually move upward, so as to remove the bubbles in the resin glue. Further, the negative pressure machine 280 and the pressure supply pump 250 do not operate synchronously. After the stirring fan blade 260 stirs the resin glue for a certain period of time, the negative pressure machine 280 is started first to remove the bubbles in the resin glue, and then the pressure supply pump 250 is started, so that the resin glue is transported between the isolation layer 180 and the diversion layer 160 in a bubble-free state.

[0044] In one embodiment, a heating wire 310 is provided on the glue storage tank 240. The heating wire 310 is used to heat the resin glue stored inside the glue storage tank 240. By providing the heating wire 310, it is ensured that the resin glue is in a flowing state in the glue storage tank 240, and at the same time, it is ensured that the resin glue can infiltrate the multi-layer fiberboard 150.

[0045] In one embodiment, a heating sleeve 320 is provided on the glue outlet pipe 190. By providing the heating sleeve 320, it is prevented that the resin glue solidifies and hardens when flowing in the glue outlet pipe 190.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A universal pressure-adjustable fiber composite material liquid molding method, characterized in that: The following steps are involved: S1, preparing a fiber preform; the fiber preform comprises a plurality of fiberboards, a mold, a demoulding layer and a sealing layer; the plurality of fiberboards are placed on the mold, the demoulding layer is placed above the plurality of fiberboards, the sealing layer is arranged outside the demoulding layer, and the sealing layer is used to prevent the plurality of fiberboards from contacting the external environment; S2, adjusting the pressure of the environment in which the fiber preform is located to a preset value; S3, conveying resin glue into the interior of the sealing layer; S4, curing is performed under the conditions of a preset temperature and a preset pressure.

2. A universal pressure-adjustable fiber composite material liquid molding method according to claim 1, characterized in that: The fiber preform also includes an isolation layer and a guide layer. The isolation layer is arranged inside the sealing layer, and the isolation layer is used to prevent the resin glue from directly contacting the sealing layer; the guide layer is arranged between the isolation layer and the demoulding layer, and the resin glue can pass through the guide layer and the demoulding layer, and the guide layer is used to guide the resin glue to infiltrate the multi-layer fiberboard.

3. A universal pressure-adjustable fiber composite material liquid molding method according to claim 2, characterized in that: When the pressure of the environment in which the fiber preform is located is adjusted to a preset value, an autoclave is included; the autoclave has a first accommodating chamber inside, the fiber preform can be placed in the first accommodating chamber, and the pressure in the first accommodating chamber can be adjusted.

4. A universal pressure-adjustable fiber composite material liquid molding method according to claim 2, characterized in that: When the pressure of the environment in which the fiber preform is located is adjusted to a preset value, it includes a pressure hood and a first pump body; the pressure hood includes a bottom plate and a snap-fit ​​hood, the bottom plate and the snap-fit ​​hood can enclose a relatively closed second accommodating cavity, the first pump body is used to adjust the air pressure in the second accommodating cavity, and the fiber preform can be placed in the second accommodating cavity.

5. A universal pressure-adjustable fiber composite material liquid molding method according to any one of claims 3 or 4, characterized in that: When transporting resin glue to the inside of the sealing layer, a glue injection machine and an air pump are included; the glue injection machine has a glue outlet pipe, and the glue outlet pipe passes through the autoclave or the bottom plate; one end of the glue outlet pipe is arranged between the isolation layer and the guide layer; the air pump has an exhaust pipe, and the exhaust pipe passes through the autoclave or the bottom plate; one end of the exhaust pipe is arranged between the isolation layer and the guide layer, wherein the exhaust pipe and the glue outlet pipe are arranged on both sides of the fiberboard.

6. A universal pressure-adjustable fiber composite material liquid molding method according to claim 5, characterized in that: A buffer box is arranged on the air extraction pipe, and the buffer box is used to prevent the resin glue from entering the interior of the air extractor through the air extraction pipe.

7. The universal pressure-adjustable fiber composite material liquid molding method according to claim 5, characterized in that: The glue injection machine includes a glue storage box, a pressure pump and a stirring member. The glue storage box is hollow inside and stores resin glue. The pressure pump is used to supply pressure to the glue storage box, and one end of the glue outlet pipe extends to the inside of the glue storage box. The stirring member is used to stir the resin glue inside the glue storage box.

8. A universal pressure-adjustable fiber composite material liquid molding method according to claim 7, characterized in that: The glue injection machine also includes a negative pressure machine, which is used to extract the pressure inside the glue storage box. The negative pressure machine and the pressure supply pump are started alternately.

9. The universal pressure-adjustable fiber composite material liquid molding method according to claim 7, characterized in that: The glue storage box is provided with a heating wire, and the heating wire is used to heat the resin glue stored in the glue storage box.

10. A universal pressure-adjustable fiber composite material liquid molding method according to claim 9, characterized in that: The rubber outlet pipe is provided with a heating sleeve.

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