Combined die for manufacturing light aircraft composite root rib

Abstract

The utility model relates to the technical field of light aircraft manufacturing, in particular to a combined die for manufacturing a light aircraft composite root rib, which comprises a male die, a female die and a pressurizing block, the male die comprises a male die sub-block I and a male die sub-block II, and the male die sub-block I and the male die sub-block II are connected through a hinge and can be opened and closed; the first male die block and the second male die block are combined to form a wing-shaped groove body matched with the light airplane root rib in appearance. The female die is formed by splicing six modules, a groove is formed in the middle of the female die, and the whole groove is of a funnel-shaped structure; the pressurizing block serves as a pressure applying part, the upper end of the pressurizing block makes contact with the hydraulic machine, the lower end of the pressurizing block is inserted into a groove in the middle of the female die, the pressurizing block transmits pressure of the hydraulic machine to the female die, and the six die blocks of the female die are pressed on the inner wall of the male die. Through the design of the pressurizing block and the female die, the female die can be tightly pressed on the inner wall of the male die, uniform distribution of pressure is ensured, and the manufacturing efficiency and the forming quality of the light aircraft root rib are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of light aircraft manufacturing, in particular to a combined mold for manufacturing composite root ribs of light aircraft. Background Art

[0002] When processing the root ribs of carbon fiber composites for light aircraft, the traditional molding process usually lays carbon cloth on a complete male mold, and uses hand paste molding, bag pressing method (pressure bag method) molding, autoclave molding, RTM molding and other processes. These processes all have some problems. For example, using pure hand paste molding will result in insufficient precision and low product quality rate; using the bag pressing method will also result in insufficient precision requirements, too many bubbles in the carbon cloth will cause bulging, uneven force on each part, unstable molding quality, and high requirements for carbon cloth performance; if using autoclave molding, it will result in high costs and long cycles; if using RTM molding, long-term jet erosion will cause the mold to be easily damaged. The domestic light aircraft industry has a good development trend, and some problems with the existing carbon fiber composite molding technology have hindered the industry from continuing to develop in the direction of low cost and high quality.

[0003] Therefore, developing a low-cost, high-quality combined mold that can utilize a traditional hydraulic press for uniform pressure molding and improving the traditional molding process have become issues that need to be urgently addressed. Utility Model Content

[0004] The utility model provides a composite root rib combined mold for a light aircraft, which can realize uniform pressure molding of carbon fiber composites by utilizing a hydraulic press and a pressure block structure, so as to solve the problems of insufficient process precision and excessively high cost in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a combined mold for manufacturing a composite root rib of a light aircraft, comprising: a male mold, a female mold and a pressure block;

[0006] The male mold includes a male mold block 1 and a male mold block 2, wherein the male mold block 1 and the male mold block 2 are connected by a hinge and can be opened and closed; the male mold block 1 and the male mold block 2 are combined to form an airfoil-shaped slot body matching the root rib shape of a light aircraft;

[0007] The female mold is composed of six modules spliced ​​together, and a groove is provided in the middle of the female mold, and the entire groove is a funnel-shaped structure;

[0008] The pressure block serves as a pressure component, with its upper end in contact with the hydraulic press and its lower end inserted into the groove in the middle of the female mold. The pressure block transmits the pressure of the hydraulic press to the female mold, pressing the six modules of the female mold onto the inner wall of the male mold.

[0009] Furthermore, the upper part of the pressure block is a cylinder, and the lower part is a conical structure; the conical structure of the lower part of the pressure block fits with the funnel-shaped structure at the lower part of the central groove of the female mold.

[0010] Furthermore, the female mold includes female mold block one, female mold block two, female mold block three, female mold block four, female mold block five and female mold block six; the female mold block one, female mold block two and female mold block three are located on the side of the female mold close to the beam, the female mold block six is ​​located on the side of the female mold close to the front edge, and the female mold block four and female mold block five are respectively located on the upper and lower sides of the female mold.

[0011] Furthermore, it also includes a female mold fixing device, which is a plate-like structure with a recessed portion in the middle, and the shape and size of the recessed portion match the shape and size of the top of the female mold. When in use, the assembled top of the female mold is placed face down in the recessed portion of the female mold fixing device, and the female mold is limited by the recessed portion.

[0012] Furthermore, the male mold and the female mold are both made of Invar.

[0013] Furthermore, a threaded hole is respectively provided on the upper surface of the six modules of the female mold.

[0014] Beneficial Effects

[0015] The utility model ensures that the female mold can be pressed against the inner wall of the male mold through the design of the pressure block and the female mold, and ensures the uniform distribution of pressure, thereby improving the manufacturing efficiency and molding quality of the root rib of the light aircraft. Compared with the existing bag pressing and hand lay-up molding processes, the processing accuracy is high, the product quality rate is high, and the cost is lower than the existing autoclave molding process.

[0016] The female mold of the utility model adopts the form of a combination of multiple modules, and the modules can be taken out from the molded part one by one, so as to prevent the female mold from being wrapped in the molded part and being difficult to take out. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the female mold of the combined mold disclosed in the utility model;

[0019] Figure 2 It is a structural schematic diagram of the male mold of the combined mold disclosed in the utility model;

[0020] Figure 3 It is a top view of the male mold of the combined mold disclosed in the utility model;

[0021] Figure 4 It is a schematic diagram of the female mold fixing device of the combined mold disclosed in the utility model;

[0022] Figure 5 It is a schematic diagram of a wedge-shaped pressure block of the combined mold disclosed in the utility model;

[0023] Figure 6 It is a schematic diagram of a bolt pry bar of a combined mold disclosed by the utility model.

[0024] In the figure:

[0025] 1- female mold block one; 2- female mold block two; 3- female mold block three; 4- female mold block four; 5- female mold block five; 6- female mold block six; 7- wedge-shaped pressure block; 8- female mold fixing device; 9- male mold block one; 10- male mold block two; 11- bolt pry bar. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: Figure 1-6 As shown, a composite root rib assembly mold for a light aircraft includes: a male mold, a female mold and a pressure block 7;

[0028] The male mold includes a male mold block 1 9 and a male mold block 2 10. The shapes of the male mold block 1 9 and the male mold block 2 10 are designed to cooperate with the female mold to form the shape of the root rib of the light aircraft; the male mold block 1 9 and the male mold block 2 10 are connected by hinges to achieve opening and closing, and are fixed with bolts to ensure that they can be stably closed and withstand the pressure from the female mold during the molding process;

[0029] The root rib of the light aircraft is a thin-walled airfoil structure, and the male mold block 1 9 and the male mold block 2 10 are combined to form an airfoil groove body that matches the shape of the light aircraft root rib; the size and shape of the airfoil groove body matches the outer wall of the light aircraft root rib;

[0030] The female mold is composed of six modules. The shape of the outer wall of the female mold matches that of the male mold, and is used to form the inner wall of the aircraft root rib. The composite material for making the aircraft root rib is laid on the outer wall of the female mold except the top surface. When in use, the female mold with the composite material laid is inserted into the male mold, and the space between the male and female molds is used as the forming space of the aircraft root rib.

[0031] The female mold includes six modules connected to each other, each of which has a specific inward angle and curved surface to ensure that the molded part has the required geometric shape; a groove is arranged in the middle of the female mold, and the entire groove is in the shape of a truncated cone; the groove is formed by the six modules being connected together;

[0032] The pressure block 7 is used as a pressure-applying component, with its upper end being used to contact the hydraulic press and transmit pressure, and its lower end being inserted into the groove in the middle of the female mold. The pressure block 7 transmits the pressure of the hydraulic press to the female mold, and presses the six modules of the female mold and the composite materials laid on the six modules onto the inner wall of the male mold; this helps to compact the composite materials more evenly, reduce bubbles and voids in the composite materials, and thus improve the quality and consistency of the molded parts.

[0033] Furthermore, the upper part of the pressure block 7 is a cylinder, which is used to contact with the hydraulic press and transmit power; the lower part of the pressure block 7 is a conical structure. The pressure block 7 is inserted into the groove in the middle of the female mold during the molding process, and is used in conjunction with the female mold and the male mold. The lower part of the pressure block 7 is a conical structure that fits the lower part of the female mold groove. During the downward insertion of the pressure block 7, the six modules are squeezed around and pressed on the inner wall of the male mold. The composite material for making the root rib of the aircraft is compacted on the inner wall of the male mold, so that pressure can be applied more evenly to each part of the composite material to ensure molding quality.

[0034] Furthermore, the negative mold includes a negative mold block 1, a negative mold block 2, a negative mold block 3, a negative mold block 4, a negative mold block 5 and a negative mold block 6; the negative mold block 1, the negative mold block 2, the negative mold block 3, and the negative mold block 6 are located on the side of the negative mold close to the beam, the negative mold block 6 is located on the side of the negative mold close to the front edge, and the negative mold block 4 and the negative mold block 5 are respectively located on the upper and lower sides of the negative mold.

[0035] The negative mold block 1, the negative mold block 2, the negative mold block 3, the negative mold block 4, the negative mold block 5 and the negative mold block 6 are used to cooperate with the positive mold to form the inner wall of the root rib. The inclination angle and curved surface of each module are determined by the shape requirements of the root rib to ensure that the root rib has the required geometric shape after molding. The upper surfaces of the six modules of the female mold are all provided with threaded holes. The bolt pry bar 11 is a rod-shaped structure, and its lower end is provided with a thread that matches the threaded hole. By screwing the bolt pry bar 11 into the threaded hole, the six modules can be easily removed from the molded part. It should be noted that in actual work, the six modules can be taken out in sequence in the order of female mold block 1, female mold block 2, female mold block 3, female mold block 4, female mold block 5, and female mold block 6 in cooperation with the bolt pry bar 11. Because female mold block 1 is a module close to the wing beam and does not fit the wing surface above and below, and the side wall of female mold block 11 has no inclination, it can be taken out directly outward first, and then the female mold block 2 2 and female mold block 3 3 on its upper and lower sides are taken out. At this time, there is sufficient space for female mold block 4, female mold block 5, and female mold block 6 to be easily taken out.

[0036] Furthermore, it also includes a female mold fixing device 8. The female mold fixing device 8 is a plate-like structure, in which a recessed portion is provided. The shape and size of the recessed portion match the shape and size of the top of the female mold. When in use, the assembled top of the female mold is placed face down in the recessed portion of the female mold fixing device 8. The recessed portion limits the female mold to ensure that the shape and structure of the female mold are correct; it is convenient to lay the composite material on the outer surface of the female mold except the top surface. When the laying of the composite material is completed, the female mold is placed in the male mold, and then the female mold fixing device 8 is removed.

[0037] Furthermore, the male and female molds are made of Invar steel, which has low material price and is easy to process. Its physical properties of high plasticity and high toughness increase the service life of the mold.

[0038] Working principle:

[0039] The utility model is based on composite material lamination molding technology. Pre-impregnated carbon fiber cloth or other composite materials are laid on the corresponding parts of the mold, and the composite materials are solidified and molded by pressure and temperature to form an aircraft root rib structure with specific geometric shape and performance requirements.

[0040] The core of the combined mold is to utilize the pressure of the traditional hydraulic press through the wedge principle, convert the vertical pressure into multi-directional pressure through the pressure block 7, and evenly apply it to the carbon fiber composite. This pressure conversion ensures the accuracy and quality of the composite root rib during the molding process.

[0041] During use, the female mold is first assembled: the assembled female mold is inverted and fixed in the recessed part of the female mold fixing device 8, ensuring that the six modules of the female mold are correctly aligned without offset.

[0042] Then spray anti-adhesive on the outer surface of the female mold to facilitate demoulding to prevent the carbon fiber cloth from sticking to the mold. Lay the carbon fiber cloth on the treated outer surface of the female mold and perform necessary pre-processing on the laid carbon fiber cloth, such as spraying setting agent, cutting, and trimming edges.

[0043] Open the male mold, place the female mold with the processed carbon fiber cloth into the male mold from the side, and then close the male mold.

[0044] Finally, the pressure block 7 is placed in the groove in the middle of the female mold, and the entire mold is placed under the hydraulic press. The hydraulic press parameters are set, and the hydraulic press presses the pressure block 7 downward to start pressure molding.

[0045] Take out the molded parts: After molding is completed, take out the six modules of the female mold in sequence, and open the male mold directly to take out the molded products.

[0046] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A combined mold for manufacturing composite root ribs of light aircraft, characterized in that: include: A male mold, a female mold and a pressure block (7); The male mold comprises a male mold block 1 (9) and a male mold block 2 (10), wherein the male mold block 1 (9) and the male mold block 2 (10) are connected by a hinge and can be opened and closed; the male mold block 1 (9) and the male mold block 2 (10) are combined to form a trough body of an airfoil shape matching the root rib shape of a light aircraft; The female mold is composed of six modules spliced ​​together, and a groove is provided in the middle of the female mold, and the entire groove is a funnel-shaped structure; The pressure block (7) serves as a pressure component, with its upper end in contact with the hydraulic press and its lower end inserted into the groove in the middle of the female mold. The pressure block (7) transmits the pressure of the hydraulic press to the female mold, pressing the six modules of the female mold onto the inner wall of the male mold.

2. The combined mold for manufacturing the root rib of a light aircraft composite material according to claim 1, characterized in that: The upper part of the pressure block (7) is a cylinder, and the lower part is a conical structure; the conical structure of the lower part of the pressure block (7) fits with the funnel-shaped structure at the lower part of the central groove of the female mold.

3. The combined mold for manufacturing the root rib of a light aircraft composite material according to claim 1, characterized in that: The female mold comprises a female mold block one (1), a female mold block two (2), a female mold block three (3), a female mold block four (4), a female mold block five (5) and a female mold block six (6); the female mold block one (1), the female mold block two (2) and the female mold block three (3) are located on a side of the female mold close to the beam, the female mold block six (6) is located on a side of the female mold close to the front edge, and the female mold block four (4) and the female mold block five (5) are located on the upper side and the lower side of the female mold respectively.

4. The combined mold for manufacturing composite root ribs of light aircraft according to claim 3, characterized in that: It also includes a female mold fixing device (8), which is a plate-like structure with a recessed portion in the middle. The shape and size of the recessed portion match the shape and size of the top of the female mold. When in use, the assembled top of the female mold is placed downward in the recessed portion of the female mold fixing device (8), and the female mold is limited by the recessed portion.

5. The combined mold for manufacturing the root rib of a light aircraft composite material according to claim 1, characterized in that: Both the male and female molds are made of Invar.

6. The combined mold for manufacturing light aircraft composite root ribs according to claim 1, characterized in that: A threaded hole is respectively provided on the upper surface of the six modules of the female mold.

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