Composite material high-pressure RTM one-mold two-cavity forming structure
By designing a composite high-pressure RTM one-mode and two-cavity molding structure, the problem of fiber impact deformation and displacement during resin injection is solved, the uniformity of resin wetting and one-time molding is achieved, which reduces product scrapping and reworking costs and saves production costs.
Patent Information
- Application Number
- CN202421831617.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing composite high-pressure RTM one-mode and two-cavity molding structure can easily lead to impact deformation and displacement of fibers in the mold cavity during resin injection, resulting in the problem of product scrapping and high repair costs.
A composite high-pressure RTM one-mold two-cavity molding structure is designed, including an upper mold and a lower mold. The upper end of the lower mold is symmetrically opened with a mold cavity on the left and right. A pressing block is set at the lower end of the upper mold, a seal strip is installed along the circumference of the lower mold, and a preformed body is set between the upper mold and the lower mold. The injection gun head is installed in the center of the upper mold. After the resin is injected, the diffusion space becomes larger. The diffusion process is that a large area of fibers gradually diffuses, and the resin wetting is more even.
By expanding the diffusion space after resin injection and improving the uniformity of the resin wetting process, the fiber deformation and displacement problems caused by strong impact force are avoided, the product scrapping and reworking costs are reduced, and one-time mold removal is achieved through extension plate connection, saving production costs.
Smart Images
Figure CN222904620U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of composite materials, in particular to a high-pressure RTM one-mold two-cavity forming structure for composite materials. Background Technique
[0002] In the process of high-pressure RTM forming of composite materials, a preform is placed into a forming mold. After the upper and lower molds are closed, resin is injected and cured. In the actual production process, in order to improve the forming efficiency, the high-pressure RTM forming mold is usually designed into a one-mold two-cavity structure to achieve the purpose of producing two products at the same time. Due to the limitations of the high-pressure RTM process and equipment, a set of molds can only have one resin injection port. Therefore, for a one-mold two-cavity forming mold, the resin injection port is usually located in the middle position between the two mold cavities.
[0003] The existing high-pressure RTM one-mold two-cavity forming structure for composite materials usually uses two preforms placed into two mold cavities respectively, and the two mold cavities are only connected by a runner with the same width as the diameter of the resin injection gun head. As Figure 1 shown, the resin runner of this structure is relatively narrow. When the resin injection flow rate is large, a strong impact force will be formed, which will impact and deform the fibers in the mold cavity and displace them, forming eddy currents and affecting resin infiltration. At the same time, resin debris will remain on the zero-contact surface of the mold between the two mold cavities and is difficult to clean due to static electricity and adsorb on the mold surface. Summary of the Utility Model
[0004] In order to solve the problems of the above-mentioned prior art, the utility model provides a high-pressure RTM one-mold two-cavity forming structure for composite materials, which solves the problems that the fibers in the mold cavity are easily impacted, deformed and displaced during resin injection, resulting in product scrapping and high repair costs.
[0005] To achieve the above object, the utility model provides the following technical solution: A high-pressure RTM one-mold two-cavity forming structure for composite materials, including an upper mold and a lower mold. The left and right sides at the upper end of the lower mold are symmetrically provided with mold cavities. The lower end of the upper mold is provided with pressing blocks at positions corresponding to the mold cavities. A sealing strip is installed around the circumference of the lower mold. A preform is arranged between the upper mold and the lower mold.
[0006] Preferably, an installation groove is opened at the central position of the upper end of the upper mold. The injection gun head is arranged in the installation groove through a fixing bolt, and the injection port of the injection gun head is flush with the lower surface of the upper mold.
[0007] With the above structural design, the diffusion space becomes larger after resin injection, and the diffusion process is a gradual diffusion in a large-area fiber region, making the resin infiltration process more uniform. Compared with the existing structure where only a runner with the same width as the resin injection gun head diameter connects between two mold cavities, there will be no problem of strong impact deforming and displacing the fibers in the mold cavity, nor will there be a problem of affecting infiltration due to lack of fibers locally, reducing the product scrapping and rework costs.
[0008] Preferably, the preform includes a left preform and a right preform. A left extension plate is fixedly connected to the side end of the left preform, and a right extension plate is fixedly connected to the side end of the right preform. The left preform and the right preform are placed in a lapped state on the connection area between two mold cavities.
[0009] With the above structural design, the products in the two mold cavities are connected by the extension plates to form an integral whole and are demolded at one time. Compared with the existing forming structure that requires the two products to be demolded separately, the demolding time is reduced and the production cost is saved.
[0010] Preferably, the gap between the upper mold and the lower mold after clamping is the same as the thickness of the overlapping of the left extension plate and the right extension plate.
[0011] With the above structural design, after the product is formed, the products in the two mold cavities are connected by the extension plates to form an integral whole. There is no zero-contact surface structure inside the mold, and no resin debris will remain on the mold surface. The production of the next mold product can be carried out without cleaning the mold. Compared with the existing forming structure that requires cleaning the mold, the production cost is saved.
[0012] Preferably, the left extension plate, the right extension plate, the left preform, and the right preform are all made of fiber materials.
[0013] Compared with the prior art, the beneficial effects of the present utility model are:
[0014] 1. The diffusion space becomes larger after resin injection, and the diffusion process is a gradual diffusion in a large-area fiber region, making the resin infiltration process more uniform. Compared with the existing structure where only a runner with the same width as the resin injection gun head diameter connects between two mold cavities, there will be no problem of strong impact deforming and displacing the fibers in the mold cavity, nor will there be a problem of affecting infiltration due to lack of fibers locally, reducing the product scrapping and rework costs.
[0015] 2. The products in the two mold cavities are connected by an extension plate to form a whole, and are demolded at one time. Compared with the existing molding structure that requires the two products to be demolded separately, the demolding time is reduced and the production cost is saved. After the product molding is completed, the products in the two mold cavities are connected by an extension plate to form a whole. There is no zero-contact surface structure inside the mold, and there will be no resin debris remaining on the mold surface. The next mold product can be produced without cleaning the mold. Compared with the existing molding structure that requires mold cleaning, the production cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic structural diagram of the lower mold in the background art;
[0017] Figure 2 is a schematic structural diagram of the present invention;
[0018] Figure 3 is a schematic structural diagram of the injection gun head of the present invention;
[0019] Figure 4 is a schematic bottom view structural diagram of the present invention;
[0020] Figure 5 is a schematic structural diagram of the lower template of the present invention;
[0021] Figure 6 is a schematic connection diagram of the left preform and the right preform of the present invention;
[0022] Figure 7 For the present invention Figure 6 The enlarged structural diagram at A in. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] 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 fall within the protection scope of the present invention.
[0024] Please refer to Figures 1-7 , the present invention provides a technical solution: a high-pressure RTM one-mold two-cavity molding structure for composite materials, including an upper mold 2 and a lower mold 1. The left and right sides of the upper end of the lower mold 1 are symmetrically provided with mold cavities 8. A pressing block 7 is arranged at the lower end of the upper mold 2 relative to the position of the mold cavity 8. A sealing strip 9 is installed around the circumference of the lower mold 1. A preform is arranged between the upper mold 2 and the lower mold 1.
[0025] An installation groove 3 is provided at the central position of the upper end of the upper mold 2. The injection gun head 6 is arranged in the installation groove 3 through a fixing bolt 5. The injection port of the injection gun head 6 is flush with the lower surface of the upper mold 2. After the resin is injected, the diffusion space becomes larger, and the diffusion process is that the large-area fiber region gradually diffuses, making the resin infiltration process more uniform. Compared with the existing connection structure where only a runner 4 with the same width as the diameter of the resin injection gun head 6 is used to connect between two mold cavities 8, the problem that the fibers in the mold cavity 8 are impacted, deformed, and displaced by a strong impact force will not occur, nor will the problem of uneven infiltration due to the lack of fibers in some parts, reducing the product scrapping and repair costs.
[0026] The preform includes a left preform 10 and a right preform 11. A left extension plate 12 is fixedly connected to the side end of the left preform 10, and a right extension plate 13 is fixedly connected to the side end of the right preform 11. The left preform 10 and the right preform 11 are placed in a lapped state on the connection area between the two mold cavities 8. The products in the two mold cavities 8 are connected into a whole through the extension plates and demolded at one time. Compared with the existing molding structure that requires two products to be demolded separately, the demolding time is reduced and the production cost is saved.
[0027] The gap between the upper mold 2 and the lower mold 1 after clamping is the same as the thickness of the overlapping of the left extension plate 12 and the right extension plate 13. After the product is molded, the products in the two mold cavities 8 are connected into a whole through the extension plates. There is no zero-contact surface structure inside the mold, and no resin debris will remain on the mold surface. The production of the next mold product can be carried out without cleaning the mold. Compared with the existing molding structure that requires mold cleaning, the production cost is saved.
[0028] Both the left extension plate 12 and the right extension plate 13 and the left preform 10 and the right preform 11 are made of fiber cloth material.
[0029] Working principle: First, install the resin injection gun head 6 into the installation groove 3 at the central position of the upper mold 2 and fix it with a fixing bolt 5. The surface of the gun head injection port is flush with the lower surface of the upper mold 2. Then, place the main parts of the left preform 10 and the right preform 11 into the two mold cavities 8 in the lower mold 1 respectively. The left extension plate 12 and the right extension plate 13 of the two preforms are placed in a lapped state on the connection area between the two mold cavities 8 of the lower mold 1. Clamp the upper mold 2 and the lower mold 1 under pressure. The upper mold 2 and the lower mold 1 are in a completely fitting state inside the sealing strip 9 without gaps, forming a closed structure for the whole mold. Subsequently, the operator injects the resin into the mold from the injection gun head 6. The resin flows in the mold cavity 8 and fills the mold cavity 8. After infiltrating the left preform 10 and the right preform 11, it starts to cure. After curing, the upper mold 2 and the lower mold 1 are opened, and then the molded body with the two products connected as a whole is demolded from the lower mold 1 at one time.
[0030] Once the formed body that connects two products into one after forming is placed on the tooling for positioning and fixing, cutting and opening holes are carried out according to the processing program. After the processing is completed, the two products after cutting and opening holes are successively removed from the tooling, and the remaining materials from cutting and opening holes are put into the waste bin.
[0031] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. 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 present utility model.
Claims
1. A composite material high pressure RTM one-mold two-cavity molding structure, comprising an upper mold (2) and a lower mold (1), characterized in that: The lower mold (1) has mold cavities (8) symmetrically formed on the left and right sides of the upper end, a pressing block (7) is provided at the lower end of the upper mold (2) at a position relative to the mold cavity (8), a sealing strip (9) is installed around the upper edge of the lower mold (1), and a preform is provided between the upper mold (2) and the lower mold (1).
2. A composite material high pressure RTM one-mold two-cavity molding structure according to claim 1, characterized in that: A mounting groove (3) is provided at the center of the upper end of the upper mold (2), and an injection gun head (6) is arranged in the mounting groove (3) by means of a fixing bolt (5), and an injection port of the injection gun head (6) is flush with the lower surface of the upper mold (2).
3. The composite material high pressure RTM one-mold two-cavity molding structure according to claim 1, characterized in that: The preform comprises a left preform (10) and a right preform (11); the side end of the left preform (10) is fixedly connected to a left extension plate (12); the side end of the right preform (11) is fixedly connected to a right extension plate (13); the left preform (10) and the right preform (11) are placed in an overlapping state on a connection area between two mold cavities (8).
4. A composite material high pressure RTM one-mold two-cavity molding structure according to claim 3, characterized in that: The gap between the upper mold (2) and the lower mold (1) after mold closing is the same as the thickness of the left extension plate (12) and the right extension plate (13) superimposed.
5. The composite material high pressure RTM one-mold two-cavity molding structure according to claim 3, characterized in that: The left extension plate (12), the right extension plate (13), the left preform (10), and the right preform (11) are all made of fiber materials.