A segmented high-pressure injection resin transfer molding process

Abstract

The present invention relates to the technical field of composite material production and manufacturing, and more specifically, to a segmented high-pressure injection resin transfer molding process, which includes the following steps: Step 1, laying the reinforcing material into the mold cavity of the lower mold; Step 2, controlling the upper mold and the lower mold to close by a press, so that an injection chamber is formed between the upper mold and the lower mold; Step 3, closing the overflow glue channel of the upper mold, driving the upper mold to move to a preset position toward the lower mold by a press, performing a first pressure treatment on the injection chamber, and then injecting resin into the injection chamber; Step 4, after the resin injection amount reaches a preset value, opening the overflow glue channel, and driving the upper mold to perform a second pressure treatment by a press. The present invention adopts a two-stage pressure method to apply pressure to the reinforcing material and the resin, which can effectively improve the fusion effect of the reinforcing material and the resin, and effectively improve the performance of the reinforced composite material products produced.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material production and manufacturing, and more particularly to a segmented high-pressure injection resin transfer molding process. Background Art

[0002] Fiber-reinforced composite materials are composite materials formed by winding, molding or pultrusion of reinforcing fiber materials, such as glass fiber, carbon fiber, aramid fiber, etc., with matrix materials.

[0003] Fiber-reinforced composites have become a leader in the new materials market due to their high strength, high modulus, and low price. However, existing processes for producing fiber-reinforced composites are no longer able to meet the demands of higher fiber content, improved production efficiency, and higher product yields. Fiber-reinforced composites produced using existing technologies have low fiber volume content, resulting in lower performance. Summary of the Invention

[0004] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] To at least partially solve the above problems, the present invention provides a segmented high-pressure injection resin transfer molding process, which includes the following steps:

[0006] Step 1: Lay the reinforcement material into the mold cavity of the lower mold;

[0007] Step 2: The upper mold and the lower mold are closed by a press, and an injection cavity is formed between the upper mold and the lower mold;

[0008] Step 3: Close the overflow channel of the upper mold, use the press to drive the upper mold to move toward the lower mold to a preset position, apply pressure to the injection cavity for the first time, and then inject resin into the injection cavity;

[0009] Step 4: After the resin injection volume reaches the preset value, the overflow channel is opened, and the upper mold is driven by the press to perform a second pressure treatment, so that the excess resin in the injection cavity is pressed into the overflow cavity of the upper mold through the overflow channel;

[0010] Step 5: According to the preset holding pressure and holding temperature, the reinforcement material layer and the resin injected into the cavity are subjected to pressure holding and heat preservation treatment, and the reinforced composite material product is obtained after demoulding.

[0011] Preferably, in the step 1, before laying the reinforcing material into the mold cavity of the lower mold, the reinforcing material is cut according to a preset size, and the lower mold is heated according to a preset temperature.

[0012] Preferably, the glue injection gun of the glue injection machine is connected to the glue injection port of the upper mold.

[0013] Preferably, the overflow glue chamber is provided on the upper mold, the overflow glue chamber and the injection chamber are connected via an overflow glue channel, and an overflow glue channel valve is provided in the overflow glue channel.

[0014] Preferably, in step 2, the upper and lower molds of the mold are closed by a press to form an injection cavity, and then the interior of the injection cavity is vacuumed by the cooperation of a vacuum pump and a vacuum exhaust hole of the upper mold.

[0015] Preferably, when performing vacuum treatment by a vacuum pump, the vacuum pump is stopped after the vacuum meter shows that the vacuum reaches -0.95 MPa.

[0016] Preferably, the reinforcement material comprises fiber reinforcement material.

[0017] Preferably, the fiber reinforcement material is one or a combination of glass fiber, carbon fiber, aramid fiber and basalt fiber.

[0018] Preferably, a glue overflow channel valve is provided in the glue overflow channel to control the opening or closing of the glue overflow channel through the glue overflow channel valve.

[0019] Preferably, a waste glue cleaning device is connected to the overflow glue chamber to clean the waste glue in the overflow glue chamber.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] The present invention provides a segmented high-pressure injection resin transfer molding process, which uses a two-stage pressure application method to apply pressure to the reinforcing material and the resin, which can effectively improve the fusion effect of the reinforcing material and the resin, and effectively improve the performance of the reinforced composite material products produced. While ensuring the mass production rhythm, the volume content of the reinforcing material in the product can be greatly increased, thereby achieving the purpose of reducing the product thickness and improving the product strength; the present invention can realize the production and processing of high-fiber volume content, large-scale, continuous, and consistent performance products, and the products produced have a high fiber volume content and good strength.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 This is a flow chart of a segmented high-pressure injection resin transfer molding process of the present invention;

[0025] Figure 2 A schematic diagram of the first direction structure of the upper mold, the first cleaning device and the second cleaning device provided in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the second direction structure of the upper mold, the first cleaning device and the second cleaning device provided in an embodiment of the present invention;

[0027] Figure 4 A schematic structural diagram of an upper mold provided by an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the first direction structure of a first cleaning device provided by an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the second direction structure of the first cleaning device provided by an embodiment of the present invention;

[0030] Figure 7 A schematic structural diagram of a second cleaning device provided in an embodiment of the present invention;

[0031] Figure 8 A schematic structural diagram of a pressing ejector provided in an embodiment of the present invention.

[0032] Icons: upper mold 1; overflow glue chamber 101; overflow glue channel 102; first cleaning device 2; U-shaped scraper 201; guide slide 202; side slider 203; guide shaft 204; baffle 205; first compression spring 206; limit baffle 207; pitch adjusting screw 208; linkage frame 209; oblique connecting rod 210; transmission rack 211; limit sleeve 212; incomplete gear 213; bidirectional motor 214; second cleaning device 3; ejector rod 301; sliding seat 302; push-pull connecting rod 303; pushing frame 304; vertical shaft 305; support 306; second compression spring 307; limit plate 308; pressing ejector rod 309; pressing block 310; reset compression spring 311; fixed-length insertion rod 312. DETAILED DESCRIPTION

[0033] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0035] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0036] The following is combined with Figure 1-8 The present invention is described in further detail.

[0037] Example 1

[0038] like Figure 1-8 As shown, a segmented high-pressure injection resin transfer molding process of the present invention comprises the following steps:

[0039] Step 1: Lay the reinforcement material into the mold cavity of the lower mold;

[0040] Step 2: The upper mold 1 and the lower mold are closed by a press, and an injection cavity is formed between the upper mold 1 and the lower mold;

[0041] Step 3: Close the overflow channel of the upper mold 1, use the press to drive the upper mold 1 to move toward the lower mold to a preset position, apply pressure to the injection cavity for the first time, and then inject resin into the injection cavity;

[0042] Step 4: After the resin injection volume reaches a preset value, the overflow channel is opened, and the upper mold 1 is driven by the press to perform a second pressurization process, so that the excess resin in the injection cavity is pressed into the overflow cavity 101 of the upper mold 1 through the overflow channel;

[0043] Step 5: According to the preset holding pressure and holding temperature, the reinforcement material layer and the resin injected into the cavity are subjected to pressure holding and heat preservation treatment, and the reinforced composite material product is obtained after demoulding.

[0044] The beneficial effects of the above technical solution are:

[0045] The present invention provides a segmented high-pressure injection resin transfer molding process. The present invention provides a segmented high-pressure injection resin transfer molding process. A two-stage pressure-applying method is used to apply pressure to the reinforcing material and the resin. During the first stage of pressure application, the upper mold 1 and the lower mold of the mold are controlled by a press to close. An injection cavity is formed between the upper mold 1 and the lower mold. Before the glue injection machine injects resin into the injection cavity, the upper mold 1 is driven by the press to move to a preset position toward the lower mold. The injection cavity is subjected to the first pressure application treatment, and then the resin is injected into the injection cavity. This can effectively improve the fusion effect of the resin with the reinforcing material during injection. After the resin injection is completed, the injection molding machine is opened. The overflow glue channel is opened, the pressure of the press is increased, and the resin injected into the injection chamber is subjected to a second pressure treatment. Further increasing the pressure is conducive to further enhancing the fusion effect of the resin and the reinforcing material, and the excess resin in the injection chamber can be squeezed into the overflow glue chamber 101 of the mold; the two-stage pressure method applies pressure to the reinforcing material and the resin, which can effectively improve the fusion effect of the reinforcing material and the resin, and effectively improve the performance of the reinforced composite material products produced. While ensuring the mass production rhythm, the volume content of the reinforcing material in the product can be greatly increased, thereby achieving the purpose of reducing the product thickness and improving the product strength.

[0046] In step 1, before placing the reinforcement material into the cavity of the lower mold, the reinforcement material is cut into a predetermined size and the lower mold is heated to a predetermined temperature. Cutting the reinforcement material into the predetermined size allows the reinforcement material to be more evenly placed in the cavity of the lower mold, and heating the lower mold to a predetermined temperature facilitates the fusion of the reinforcement material and the resin.

[0047] The glue injection gun of the glue injection machine is connected to the glue injection port of the upper mold 1, so that resin can be injected into the injection cavity formed between the upper mold 1 and the lower mold through the glue injection port. A control valve is provided on the glue injection port, and the glue injection port needs to be closed by the control valve after the injection is stopped.

[0048] In the second step, the upper mold 1 and the lower mold of the mold are closed by a press to form an injection cavity, and then the interior of the injection cavity is vacuumed by the cooperation of a vacuum pump and the vacuum exhaust hole of the upper mold 1.

[0049] When performing vacuuming with a vacuum pump, stop the vacuum pump when the vacuum gauge shows that the vacuum reaches -0.95 MPa.

[0050] When the resin is injected into the injection chamber, the space of the injection chamber is filled with resin, and the air in the injection chamber is squeezed. Once the air cannot be discharged to the outside of the injection chamber in time, it will affect the product, such as poor filling, burning, the appearance of air holes, uneven density and other undesirable phenomena; therefore, in the present invention, the interior of the injection chamber is vacuumed by cooperating with the vacuum pump and the vacuum exhaust hole of the upper mold 1, which is beneficial to solving the technical problem of poor exhaust of the injection chamber in the prior art and ensuring the performance of the fiber reinforced composite material product.

[0051] The reinforcement material includes a fiber reinforcement material.

[0052] The fiber reinforcement material is one or a combination of glass fiber, carbon fiber, aramid fiber and basalt fiber. The fiber reinforcement material is a product made of one or more of glass fiber, carbon fiber, aramid fiber and basalt fiber as raw materials.

[0053] A glue overflow channel valve is provided in the glue overflow channel 102 to control the opening or closing of the glue overflow channel 102 through the glue overflow channel valve.

[0054] The overflow glue channel valve includes a valve body sliding in the valve channel, and the valve body is connected to the driving end of the oil cylinder. Under the control of the oil cylinder, the overflow glue channel 102 is blocked or the blocking control of the overflow glue channel 102 is released to realize the opening or closing of the overflow glue channel 102, and the control is very convenient.

[0055] When the upper mold 1 is driven by the press to perform the second pressure treatment, the pressure of the press increases, and the depth of the upper mold 1 inserted into the lower mold cavity becomes greater, thereby making the height of the formed injection cavity smaller, which is beneficial to further enhance the fusion effect of the reinforcing material and the resin, and improve the strength of the produced product and reduce the thickness of the produced product.

[0056] Example 2

[0057] The specific method for production using a segmented high-pressure injection resin transfer molding process of the present invention comprises the following steps:

[0058] Step 1. Select appropriate fiber (glass fiber / carbon fiber / aramid fiber / basalt fiber) and resin system (epoxy resin system / polyurethane resin system) according to the technical requirements of the product;

[0059] Step 2: Cut the selected fiber fabric according to the design size of the product;

[0060] Step 3: Heat the mold to the set temperature and then perform subsequent operations;

[0061] Step 4: Place the fiber fabric cut in step 2 into the mold in sequence;

[0062] Step 5: Set the initial pressure position of the press, start the press and run it to the specified position;

[0063] Step 6: Turn on the vacuum pump. When the vacuum meter shows that the vacuum reaches -0.95 MPa, stop the vacuum pump.

[0064] Step 7: Turn on the glue injection machine and inject a set amount of resin into the mold according to the set value;

[0065] Step 8: After the glue injection machine completes the resin injection, the mold overflow channel valve is opened;

[0066] Step 9: Set the secondary pressing pressure and position of the press, and run the press to the specified position;

[0067] Step 10: Maintain pressure and heat according to the curing time of the selected resin system to ensure the curing degree of the product; holding pressure: product projection area * 700 tons, holding temperature: 80°C;

[0068] Step 11: After the product is solidified, start the press;

[0069] Step 12: demoulding and post-processing the product to obtain the produced fiber reinforced composite material product.

[0070] The present invention adopts a segmented high-pressure injection resin transfer molding process to produce fiber-reinforced composite materials, which overcomes the technical shortcomings of existing processes and realizes the production of products with high fiber volume content, large batches, continuous production, and consistent product performance. The fiber-reinforced composite materials products produced have higher fiber content, higher production efficiency, and higher product yield.

[0071] Example 3

[0072] like Figure 1-8 As shown, in a segmented high-pressure injection resin transfer molding process of the present invention, a first cleaning device 2 is connected in cooperation with the overflow glue chamber 101, and the first cleaning device 2 includes a U-shaped scraper 201, which seals and slides in the U-shaped overflow glue chamber 101; two guide slides 202 are relatively fixed on the U-shaped scraper 201, and the two guide slides 202 slide relatively in the two guide slides of the upper mold 1; one or more side sliders 203 are fixed on each guide slide 202, and the side slider 203 slides on the guide shaft 204, and the two ends of the guide shaft 204 are respectively fixed to the top surface of the upper mold 1 and the baffle 205; the baffle 205 and the side slider 203 are connected by a first compression spring 206 sleeved on the guide shaft 204.

[0073] The working principle and beneficial effects of the above technical solution are:

[0074] The overflow glue chamber 101 is connected to a first cleaning device 2, which can be used to clean the excess resin squeezed into the overflow glue chamber 101 without manual cleaning, thereby effectively increasing the cleaning speed of the excess resin and improving the continuous production efficiency of the product to a certain extent.

[0075] When the first cleaning device 2 is in use, it can not only clean the excess resin in the overflow glue chamber 101, but also cooperate with the press to play a bidirectional extrusion role. When the press squeezes the excess resin injected into the chamber into the overflow glue chamber 101, the resin entering the overflow glue chamber 101 can generate pressure on the U-shaped scraper 201, thereby pressing the U-shaped scraper 201 to slide in the U-shaped overflow glue chamber 101, and drive the two guide slides 202 to slide outward in the two guide slides of the upper mold 1. When the guide slide 202 slides outward, it can drive the side slider 203 on it to slide outward, thereby compressing the first compression spring 206 between the baffle 205 and the side slider 203. Under the elastic action of the first compression spring 206 and the cooperation of the press, a bidirectional extrusion role is played. The upward extrusion effect is beneficial to improving the performance of the produced fiber reinforced composite material products; after the production is completed, after the press controls the upper mold 1 to separate from the lower mold, the U-shaped scraper 201 can be reset under the elastic force of the multiple first compression springs 206, thereby pushing the excess resin in the overflow glue chamber 101 to the outside of the overflow glue chamber 101, and realizing the cleaning of the overflow glue chamber 101. When the elastic force of the first compression spring 206 is insufficient, resulting in the inability to effectively clean the resin in the overflow glue chamber 101, the guide slide 202 can be manually pressed to push the U-shaped scraper 201 to slide in the U-shaped overflow glue chamber 101 to clean the resin in the overflow glue chamber 101. The operation is very convenient, and there is no need to manually use a scraper to scrape the resin in the overflow glue chamber 101, which is highly efficient.

[0076] In addition, when in use, the first cleaning device 2 also has the function of judging the amount of resin filling in the overflow glue chamber 101. The amount of resin filling in the overflow glue chamber 101 of the upper mold 1 can be judged according to the length of the guide slide tube 202 sliding out to the outside of the upper mold 1, thereby facilitating more precise control of the pressure of the press that is performing the second press operation.

[0077] The first cleaning device 2 also includes a limit baffle 207 sliding on the guide shaft 204, and the limit baffle 207 and the first compression spring 206 are located at both ends of the side slider 203; the limit baffle 207 is threadedly engaged with the distance adjusting screw 208, and the distance adjusting screw 208 rotates on the top surface of the upper mold 1.

[0078] A limit baffle 207 is set on the guide shaft 204, and the initial position of the side slider 203 can be adjusted by the limit baffle 207, thereby adjusting the position of the U-shaped scraper 201 in the U-shaped overflow glue chamber 101, and finally adjusting the initial accommodating space of the overflow glue chamber 101.

[0079] The first cleaning device 2 also includes a linkage frame 209 for connecting the two guide slide tubes 202. The linkage frame 209 is rotatably connected to one end of the oblique link 210. The other end of the oblique link 210 rotates on one end of the transmission rack 211. The middle part of the transmission rack 211 slides in the limiting sleeve 212. The limiting sleeve 212 is fixed on the top surface of the upper mold 1. The other end of the transmission rack 211 can be engaged with the incomplete gear 213. The axle of the incomplete gear 213 is connected to the output shaft of the bidirectional motor 214.

[0080] The setting of the linkage frame 209 allows the two guide slides 202 to be controlled synchronously. After the bidirectional motor 214 is started, the incomplete gear 213 can be controlled to rotate. The bidirectional motor 214 has two working modes: forward and reverse.

[0081] When the bidirectional motor 214 rotates forward, that is, clockwise, as shown in FIG. Figure 5 As shown, the clockwise rotation of the bidirectional motor 214 can drive the incomplete gear 213 to rotate clockwise. When the incomplete gear 213 rotates clockwise until it contacts the transmission rack 211, it can drive the transmission rack 211 to slide to the left in the limiting sleeve 212, thereby driving the angle between the oblique link 210 and the transmission rack 211 to increase. At this time, the other end of the oblique link 210 pushes the linkage frame 209 to move in the direction away from the upper mold 1, and the linkage frame 209 drives the two guide slides 202 to move in the direction away from the upper mold 1. When the two guide slides 202 move, they drive the side slider 203 to compress the first compression spring 206. At this time, when the incomplete gear 213 rotates clockwise until it is separated from the transmission rack 211, the two guide slides 202 are reset under the elastic force of the first compression spring 206, and drive the U-shaped scraper 201 to clean the resin in the overflow glue chamber 101;

[0082] When the bidirectional motor 214 is reversed, that is, rotated counterclockwise, as shown in FIG. Figure 5As shown, the counterclockwise rotation of the bidirectional motor 214 can drive the incomplete gear 213 to rotate counterclockwise. When the incomplete gear 213 rotates counterclockwise until it contacts the transmission rack 211, it can drive the transmission rack 211 to slide on the right side in the limiting sleeve 212, thereby driving the angle between the oblique connecting rod 210 and the transmission rack 211 to become smaller. At this time, the other end of the oblique connecting rod 210 pulls the linkage frame 209 to move toward the direction close to the upper mold 1, and the linkage frame 209 drives the two guide slides 202 to move toward the direction close to the upper mold 1. When the two guide slides 202 move, they drive the U-shaped scraper 201 to mechanically press and clean the resin in the overflow chamber 101. This cleaning mode is used for cleaning resins that are more difficult to clean, and meets the resin cleaning needs in different situations.

[0083] The first cleaning device 2 in the present invention further includes:

[0084] A displacement sensor is fixed on the upper die 1 to detect the total sliding distance of the guide slide 202 in the upper die 1;

[0085] A temperature sensor is installed on the upper mold 1 to detect the actual temperature of the upper mold 1 when cleaning the overflow glue chamber 101;

[0086] a counter mounted on the upper mold 1 to detect the number of times the guide slide 202 slides in the upper mold 1 to reach a preset value, thereby obtaining the number of times the U-shaped scraper 201 cleans the overflowing glue chamber 101 and the number of times the first compression spring 206 is compressed;

[0087] An alarm is installed on the upper die 1;

[0088] The controller is installed on the upper mold 1 and is electrically connected to the displacement sensor, the temperature sensor, the counter and the alarm.

[0089] In the present invention, the actual cleaning performance of the first cleaning device 2 on the resin in the overflow glue chamber 101 is very important. The actual cleaning performance of the first cleaning device 2 on the resin in the overflow glue chamber 101 affects the continuity of subsequent fiber-reinforced composite material production, and affects the production efficiency and production effect of the fiber-reinforced composite material product. The actual cleaning performance of the first cleaning device 2 on the resin in the overflow glue chamber 101 of the present invention can be calculated by the following formula. The calculation formula is as follows:

[0090]

[0091] In the formula:

[0092] K x is the actual cleaning performance of the first cleaning device 2 of the present invention on the resin in the overflow glue chamber 101; K1 is the preset cleaning performance of the first cleaning device 2 of the present invention on the resin in the overflow glue chamber 101; rc3 C is the total sliding distance of the guide slide tube 202 in the upper mold 1 detected by the displacement sensor, that is, the total sliding distance of the U-shaped scraper 201 in the overflow chamber 101; B The wear amount generated when the squeegee 201 slides 100 meters in the overflow chamber 101 can be calculated by testing before the present invention leaves the factory. 3 ÷C B , the actual wear value of the U-shaped scraper 201 after being used for a period of time can be obtained; The maximum wear value acceptable in the present invention while ensuring the cleaning effect; The actual temperature of the upper mold 1 when cleaning the overflow glue chamber 101 detected by the internal temperature sensor of the present invention; is the preset temperature of the upper mold 1 when cleaning the overflow glue chamber 101 inside the present invention; δj is the number of times the first compression spring 206 is actually compressed obtained by the internal counter of the present invention; δl is the maximum number of times the first compression spring 206 can be compressed inside the present invention; O1 is the number of first compression springs 206 actually installed inside the present invention; O2 is the number of first compression springs 206 preset to be installed inside the present invention, O1≤O2.

[0093] The beneficial effects of the above formula are:

[0094] The above formula can be used to effectively calculate the actual cleaning performance of the first cleaning device 2 on the resin in the overflow glue chamber 101. The calculation result is accurate and the calculation efficiency is high, which is convenient for ensuring the continuity of subsequent fiber reinforced composite material product production and ensuring the production efficiency and production effect of fiber reinforced composite material products. In the above formula, various factors in actual use are fully taken into account, including the total distance of the sliding movement of the U-shaped scraper 201 in the overflow glue chamber 101, so as to obtain the actual wear value of the U-shaped scraper 201 after a period of use. The larger the actual wear value, the worse the cleaning performance of the present invention and the worse the cleaning effect. It also includes the actual temperature of the upper mold 1 when cleaning the overflow glue chamber 101 detected by the internal temperature sensor of the present invention. , when cleaning the overflow glue chamber 101, the higher the actual temperature of the upper mold 1, the easier it is for the internal U-shaped scraper 201 of the present invention to clean off the resin, the better the cleaning effect, and the higher the performance; it is also combined with the number of first compression springs 206 actually installed inside the present invention. The more first compression springs 206 there are, the greater the elastic force, the greater the force used to drive the U-shaped scraper 201 to clean the resin, and the higher the cleaning performance; the above formula can be used to effectively calculate the actual cleaning performance of the first cleaning device 2 on the resin in the overflow glue chamber 101. When the actual cleaning performance is lower than the preset cleaning performance range, the controller controls the alarm to sound, prompting the staff to conduct timely inspection and maintenance, so as to ensure the continuity and stability of the subsequent production of fiber reinforced composite materials.

[0095] Example 4

[0096] like Figure 1-8 As shown, in a segmented high-pressure injection resin transfer molding process of the present invention, the segmented high-pressure injection resin transfer molding process also includes a second cleaning device 3, so as to clean the overflow glue channel 102 for connecting the overflow glue chamber 101 and the injection chamber through the second cleaning device 3.

[0097] The working principle and beneficial effects of the above technical solution are as follows: a second cleaning device 3 is also provided inside the first cleaning device 2. When the outer side surface of the U-shaped scraper 201 and the bottom surface of the upper mold 1 reach a coplanar state, the second cleaning device 3 can be inserted into the overflow glue channel 102, thereby ejecting the residual resin in the overflow glue channel 102.

[0098] The second cleaning device 3 includes an ejector rod 301, one end of the ejector rod 301 is fixed on a sliding seat 302, the sliding seat 302 slides in the sliding cavity inside the U-shaped scraper 201, and the other end of the ejector rod 301 seals and slides in the ejection slideway on the side wall of the U-shaped scraper 201; when the outer side surface of the U-shaped scraper 201 is coplanar with the bottom surface of the upper mold 1, the ejector rod 301 is seal-connected to the overflow channel 102; the sliding seat 302 is rotatably connected to one end of the push-pull connecting rod 303, and the other end of the push-pull connecting rod 303 rotates on the pushing frame 304; the pushing frame 304 slides in the middle of the two vertical shafts 305, and the lower ends of the two vertical shafts 305 are fixed on two supports 306, and the two supports 306 are fixed on the inner wall of the guide slide tube 202; each support 306 is fixedly connected to the pushing frame 304 by a second compression spring 307.

[0099] The working principle and beneficial effects of the above technical solution are as follows: under normal conditions, since the U-shaped scraper 201 slides in the overflow glue chamber 101, the ejector rod 301 that slides in the ejection slide on the side wall of the U-shaped scraper 201 is pressed against the inner wall of the overflow glue chamber 101, and the second compression spring 307 is in a compressed state at this time; when the outer side surface of the U-shaped scraper 201 and the bottom surface of the upper mold 1 reach a coplanar state, the pushing frame 304 slides upward under the elastic force of the second compression spring 307, thereby driving one end of the push-pull connecting rod 303 to slide upward, and the other end of the push-pull connecting rod 303 drives the sliding seat 302 to slide in the U-shaped The scraper plate 201 slides in the sliding cavity inside, and drives the ejector rod 301 to slide out to the outside of the ejector slide, so that the ejector rod 301 can be inserted into the overflow glue channel 102, thereby cleaning the residual resin in the overflow glue channel 102; the ejector rod 301 not only has the function of cleaning the overflow glue channel 102, but also can play a role of limiting, so that the outer side surface of the U-shaped scraper plate 201 and the bottom surface of the upper mold 1 remain in the same plane, at this time, the scraper plate can be used to scrape the outer side surface of the U-shaped scraper plate 201 and the bottom surface of the upper mold 1, which is convenient for cleaning the outer side surface of the U-shaped scraper plate 201 and the bottom surface of the upper mold 1.

[0100] The second cleaning device 3 also includes a limit plate 308 fixed to the upper end of a vertical shaft 305, and the limit plate 308 is fixed on the inner wall of the guide slide tube 202; the limit plate 308 slides with a pressing rod 309, and the lower end of the pressing rod 309 can be pressed on the pushing frame 304, and a pressing block 310 is fixed at the upper end of the pressing rod 309, and a reset compression spring 311 is fixed between the pressing block 310 and the limit plate 308.

[0101] The setting of the pressing block 310 is used to release the state in which the ejector rod 301 is inserted into the overflow glue channel 102. The pressing block 310 can be pressed to drive the pressing ejector rod 309 to move downward. The downward movement of the pressing ejector rod 309 can push and drive the pushing frame 304 to move downward, and the cooperation of the push-pull connecting rod 303 and the sliding seat 302 can drive the ejector rod 301 to separate from the overflow glue channel 102.

[0102] The pressing push rod 309 is a screw structure, and the return compression spring 311 can be removed. At this time, rotating the pressing block 310 drives the pressing push rod 309 to rotate, which can achieve continuous pressing on the pushing frame 304, making it convenient to use when there is no need to clean the overflow glue channel 102. At this time, the overflow glue chamber 101 can be cleaned only by the first cleaning device 2.

[0103] The push rod 309 is evenly distributed with multiple fixed-length sockets, which are arranged along the axis of the push rod 309. The stop plate 308 is threaded with a fixed-length plug 312, which can be inserted into one of the fixed-length sockets. The fixed-length plug 312 cooperates with the fixed-length sockets to limit the position of the push rod 309 and control the push rod 309 to press and lock the push frame 304 for a long time.

[0104] The linkage frame 209 is connected to the top surface of the upper mold 1 via a booster spring. The provision of the booster spring further enhances the elastic force of the first cleaning device 2 when cleaning the overflowing glue chamber 101, thereby improving the cleaning effect.

[0105] The thread on the limit baffle 207 cooperates with the locking bolt, and the inner end of the locking bolt can press on the pitch adjusting screw 208, which can effectively improve the stability of the pitch adjusting screw 208 in the normal state.

[0106] A tension spring is fixed between the sliding seat 302 and the inner wall of the U-shaped scraper 201, which is beneficial to increasing the pushing pressure when the ejector rod 301 is inserted into the overflow glue channel 102, thereby improving the cleaning effect.

[0107] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 should not be understood as limiting the present invention.

[0108] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0109] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A segmented high-pressure injection resin transfer molding process, characterized in that: The process includes the following steps: Step 1: Lay the reinforcement material into the mold cavity of the lower mold; Step 2: Control the upper mold (1) and the lower mold to close by a press, so that an injection cavity is formed between the upper mold (1) and the lower mold; Step 3: close the overflow channel of the upper mold (1), drive the upper mold (1) to move to a preset position in the direction of the lower mold by a press, apply pressure to the injection cavity for the first time, and then inject resin into the injection cavity; Step 4: After the resin injection amount reaches a preset value, the overflow glue channel is opened, and the upper mold (1) is driven by a press to perform a second pressure treatment, so that the excess resin injected into the cavity is pressed into the overflow glue chamber (101) of the upper mold (1) through the overflow glue channel; Step 5: Maintaining pressure and heat preservation for the reinforcement material layer and resin injected into the cavity according to the preset holding pressure and heat preservation temperature, and obtaining a reinforced composite material product after demoulding; A first cleaning device (2) is connected in conjunction with the overflow glue chamber (101), and the first cleaning device (2) comprises a U-shaped scraper (201), which is sealed and slides in the U-shaped overflow glue chamber (101); two guide slides (202) are relatively fixed on the U-shaped scraper (201), and the two guide slides (202) slide relatively in the two guide slides of the upper mold (1); a side slider (203) is fixed on each guide slide (202), and the side slider (203) slides on the guide shaft (204), and the two ends of the guide shaft (204) are respectively fixed to the top surface of the upper mold (1) and the baffle (205); the baffle (205) and the side slider (203) are connected by a first compression spring (206) sleeved on the guide shaft (204); The first cleaning device (2) further comprises a linkage frame (209) for connecting the two guide slide tubes (202); the linkage frame (209) is rotatably connected to one end of an oblique link (210); the other end of the oblique link (210) is rotated on one end of a transmission rack (211); the middle portion of the transmission rack (211) slides in a limiting sliding sleeve (212) on the top surface of the upper mold (1); the other end of the transmission rack (211) can be engaged with an incomplete gear (213); and the wheel shaft of the incomplete gear (213) is connected to the output shaft of a bidirectional motor (214).

2. A segmented high-pressure injection resin transfer molding process according to claim 1, characterized in that: In the step 1, before laying the reinforcement material into the mold cavity of the lower mold, the reinforcement material is cut according to a preset size, and the lower mold is heated according to a preset temperature.

3. The segmented high-pressure injection resin transfer molding process according to claim 1, characterized in that: In the second step, the upper mold (1) and the lower mold of the mold are closed by a press to form an injection cavity, and then the interior of the injection cavity is vacuumed by the cooperation of a vacuum pump and the vacuum exhaust hole of the upper mold (1).

4. The segmented high-pressure injection resin transfer molding process according to claim 3, characterized in that: During the vacuum treatment, the vacuum pump is stopped when the vacuum gauge shows that the vacuum reaches -0.95MPa.

5. The segmented high-pressure injection resin transfer molding process according to claim 1, characterized in that: The reinforcement material includes a fiber reinforcement material.

6. The segmented high-pressure injection resin transfer molding process according to claim 1, characterized in that: A glue overflow channel valve is provided in the glue overflow channel (102) to control the opening or closing of the glue overflow channel (102) through the glue overflow channel valve.

7. The segmented high-pressure injection resin transfer molding process according to claim 1, characterized in that: The first cleaning device (2) further comprises a limit baffle (207) sliding on the guide shaft (204), the limit baffle (207) and the first compression spring (206) being located at both ends of the side slider (203); the limit baffle (207) is threadedly engaged with the pitch-adjusting screw (208), and the pitch-adjusting screw (208) rotates on the upper mold (1).

8. The segmented high-pressure injection resin transfer molding process according to claim 1, characterized in that: It also includes a second cleaning device (3) to clean the glue overflow channel (102) through the second cleaning device (3).

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