A composite inter-beam stiffening rib forming die and forming method

Abstract

The application discloses a composite inter-beam reinforcing wing rib forming die and a forming method. The forming die is used for forming a composite inter-beam reinforcing wing rib. The reinforcing wing rib is composed of a wing rib web plate and a wing rib edge strip. The wing rib web plate is provided with reinforcing ribs and lightening holes. The wing rib edge strip is provided with an edge strip depression for cooperating with an edge strip of a wing beam. The forming die comprises a forming lower die, a lower die core die, a plurality of intermediate dies and a forming upper die. The forming lower die, the lower die core die, the intermediate dies and the forming upper die are sequentially stacked to form a combined forming die. The middle part of the forming lower die is provided with a first groove matched with the shape of the lower die core die. The outer shape surface of the lower die core die is matched with the inner shape surface of the reinforcing wing rib. The outer shape surface of the lower die core die is provided with a second groove matched with the reinforcing ribs. The inner shape surface of the intermediate dies is matched with the outer shape surface of the reinforcing wing rib. The outer shape surface of the intermediate dies is matched with the inner shape surface of the reinforcing wing rib. The inner shape surface of the forming upper die is matched with the outer shape surface of the reinforcing wing rib.

Description

Technical Field

[0001] This invention relates to the field of composite material molding technology, specifically to a molding die for reinforcing ribs between composite beams and a molding method for reinforcing ribs between composite beams. Background Technology

[0002] Wing ribs are a crucial component of aircraft wings. As the lateral load-bearing framework of the wing, they generally conform to the shape of the airfoil and support the wing skin, maintaining the wing's cross-sectional shape. The function of wing ribs is to connect the longitudinal framework and skin, transferring aerodynamic loads from the skin and stringers to the spars, and maintaining the airfoil's cross-sectional shape. To reduce structural weight, perforations are often added to the web of the wing rib; however, these perforations reduce the strength and stiffness of the wing rib web, necessitating reinforcement. Summary of the Invention

[0003] The purpose of this invention is to address the problem that opening holes in the web of a composite beam reinforcement rib leads to a significant reduction in its strength and stiffness. This invention provides a composite beam reinforcement rib and its molding die, as well as a molding method for the composite beam reinforcement rib. This application effectively solves the problem that opening holes in the web of the composite beam reinforcement rib to reduce structural weight leads to a reduction in the strength and stiffness of the rib structure. At the same time, the solution of this invention has a simple structural design and a simple molding process, resulting in low cost.

[0004] This invention is achieved through the following technical solution:

[0005] A molding die for forming inter-beam reinforcing ribs of composite materials, characterized in that the molding die is used to form inter-beam reinforcing ribs of composite materials, the inter-beam reinforcing ribs of composite materials are composed of a rib web and a rib flange, the rib web is provided with a plurality of reinforcing ribs, the rib web is also provided with a plurality of lightening holes, and the rib flange is provided with flange recesses for cooperating with the flanges of the wing beam.

[0006] The molding die includes: a lower molding die, a lower core mold, several intermediate molds, and an upper molding die; the lower molding die, the lower core mold, the several intermediate molds, and the upper molding die are stacked sequentially to form a combined molding die;

[0007] The lower forming mold has a first groove in the middle that matches the shape of the lower mold core; the outer surface of the lower mold core matches the inner surface of the reinforcing rib, and the outer surface of the lower mold core has a second groove corresponding to the reinforcing rib; the inner surface of the intermediate mold matches the outer surface of the reinforcing rib, and the outer surface of the intermediate mold matches the inner surface of the reinforcing rib; the inner surface of the upper forming mold matches the outer surface of the reinforcing rib.

[0008] Specifically, the composite material inter-beam reinforcing rib manufactured according to the present invention includes a rib web, on which rib relief holes are provided, and reinforcing ribs are provided next to the relief holes. The two ends of the rib flange have flange recesses for engaging with the flange of the beam. The composite material inter-beam reinforcing rib of the present invention is formed using a rapid curing prepreg molding process.

[0009] The composite material beam inter-beam reinforcing rib molding die provided by this invention employs a compression molding die. Unlike commonly used compression molding dies, this invention is a combined die, including a lower molding die, a lower core mold, intermediate molds, and an upper molding die. The number of intermediate molds is unlimited in this invention, and both the lower core mold and the intermediate molds can be used as laying molds. A first groove is provided in the center of the lower molding die, which perfectly matches the shape of the lower core mold.

[0010] Preferably, the molding die provided by this invention may also have guide post holes on the lower molding die, intermediate molding die, and upper molding die to ensure accurate mold closing. Furthermore, the lower molding die, core mold, and intermediate molding die in the molding die of this invention can be quickly and alternately replaced to improve production efficiency.

[0011] Furthermore, a composite material beam inter-beam reinforcing rib forming mold: the relief hole is provided on the web of the rib between two adjacent reinforcing ribs.

[0012] Furthermore, a composite material inter-beam reinforcing rib forming mold: the flange strip is recessed at the end of the rib flange strip.

[0013] Furthermore, a composite material beam interbeam reinforcing rib forming mold: both the lower mold core mold and the intermediate mold can be used as a laying mold.

[0014] Furthermore, a molding die for reinforcing ribs between composite beams: the molding die is made of high-hardness die steel, such as P20 steel.

[0015] A method for forming inter-beam reinforcing ribs of composite materials, characterized in that the method uses the above-mentioned molding die for forming, and the method includes the following steps:

[0016] S1. Fix the lower molding die on the lower platform of the molding press, fix the upper molding die on the upper platform of the molding press, align the lower molding die and the upper molding die, and start heating at the same time;

[0017] S2. Prepreg is laid on the lower core mold and the intermediate mold respectively to form a preform;

[0018] S3. Place the lower mold core mold with the preform on it into the first groove of the forming lower mold in sequence, and place the intermediate mold with the preform on it onto the lower mold core mold.

[0019] S4. Mold closing: The lower molding mold and the upper molding mold are closed, and heating and pressurization are applied simultaneously for curing.

[0020] S5. After curing, cool down and open the mold;

[0021] S6. Demolding: Remove the cured composite material beam reinforcement ribs from the lower mold core and intermediate mold.

[0022] The composite material beam reinforcing ribs of the present invention are formed by a rapid curing prepreg molding process.

[0023] Furthermore, a method for forming inter-beam reinforcing ribs of composite materials: the heating temperature in step S1 depends on the resin.

[0024] Furthermore, a method for forming reinforcing ribs between composite beams: the pressure set in step S3 is 0.6-2.0 MPa.

[0025] Furthermore, a method for forming reinforcing ribs between composite beams: the heating method used in step S3 is electromagnetic induction heating, and the heating time is 10-15 minutes.

[0026] The beneficial effects of this invention are:

[0027] (1) The composite material beam reinforcement rib manufactured by the present invention solves the problem of reduced strength and stiffness caused by the opening of holes in the web of the existing rib.

[0028] (2) The composite material beam reinforcing ribs manufactured by this invention are produced by rapid curing prepreg molding process, which can realize mass production.

[0029] (3) The composite material beam reinforcing rib forming mold designed in this invention can quickly form beam reinforcing ribs in batches, and the formed beam reinforcing ribs have smooth inner and outer surfaces and high dimensional accuracy.

[0030] (4) The lower mold, core mold and intermediate mold in the composite material beam reinforcing rib forming mold designed in this invention can be quickly replaced in turn, which can effectively improve production efficiency. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the composite material beam-to-beam reinforcing rib manufactured according to the present invention;

[0033] Figure 2 A schematic diagram of the composite material beam inter-beam reinforcing rib forming mold designed for this invention;

[0034] Figure 3 This is a schematic diagram of the lower forming die in the composite material beam inter-beam reinforcing rib forming mold designed for this invention;

[0035] Figure 4 This is a schematic diagram of the lower core mold in the composite material beam inter-beam reinforcing rib forming mold designed for this invention;

[0036] Figure 5-6 This is a schematic diagram of the intermediate mold in the composite material beam inter-beam reinforcing rib forming mold designed in this invention;

[0037] Figure 7 This is a schematic diagram of the upper forming mold in the composite material beam inter-beam reinforcing rib forming mold designed for this invention.

[0038] The markings in the diagram are: 1. Reinforcing rib between composite beams; 2. Lower forming mold; 3. Lower mold core mold; 4. Intermediate mold; 5. Upper forming mold; 1-1 Rib web; 1-2 Rib flange; 1-3 Inner surface of reinforcing rib; 1-1-1 Reinforcing rib; 1-1-2 Lightening hole; 1-2-1 Flange recess; 2-1 First groove; 3-1 Outer surface of lower mold core mold; 3-1-1 Second groove; 4-1 Inner surface of intermediate mold; 4-2 Outer surface of intermediate mold; 5-1 Inner surface of upper forming mold. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicating orientation or positional relationships, are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein.

[0041] Example 1

[0042] like Figure 1-7 As shown, a molding die for forming inter-beam reinforcing ribs of composite materials is characterized in that the molding die is used to form inter-beam reinforcing ribs 1 of composite materials, such as... Figure 1 As shown, the composite material beam inter-beam reinforcing rib 1 is composed of a rib web 1-1 and a rib flange 1-2. The rib web 1-1 is provided with reinforcing ribs 1-1-1 and a plurality of weight-reducing holes 1-1-2 (the weight-reducing holes are used to reduce the structural weight of the rib, and the weight-reducing holes 1-1-2 are located between two adjacent reinforcing ribs 1-1-1). The two ends of the rib flange 1-2 are provided with flange recesses 1-2-1 for cooperating with the flange of the beam.

[0043] like Figure 2 As shown, the molding die includes: a lower molding die 2, a lower core mold 3, several intermediate molds 4, and an upper molding die 5; the lower molding die 2, the lower core mold 3, the intermediate molds 4, and the upper molding die 5 are stacked sequentially to form a combined molding die; the molding die of the present invention is different from commonly used molds, and is a combined mold.

[0044] The lower mold 2 has a first groove 2-1 in the middle that matches the shape of the lower mold core 3; the outer surface 3-1 of the lower mold core 3 is completely matched with the inner surface 1-3 of the reinforcing rib 1 between composite beams, and the outer surface 3-1 of the lower mold core 3 has a second groove 3-1-1 corresponding to the reinforcing rib 1-1-1; the inner surface 4-1 of the intermediate mold 4 matches the outer surface of the reinforcing rib 1, and the outer surface 4-2 of the intermediate mold 4 matches the inner surface 1-3 of the reinforcing rib 1 between composite beams; the inner surface 5-1 of the upper mold 5 matches the outer surface of the reinforcing rib 1 between composite beams.

[0045] Example 2

[0046] A method for forming inter-beam reinforcing ribs of composite materials is provided, characterized in that the method uses the forming mold described in Example 1, and the method includes the following steps:

[0047] S1. Fix the lower molding die 2 on the lower platform of the molding machine, fix the upper molding die 5 on the upper platform of the molding machine, align the lower molding die 2 and the upper molding die 5, and start heating at the same time. The temperature depends on the resin.

[0048] S2. Prepreg is laid on the male molds of the lower core mold 3 and the intermediate mold 4 to form a preform;

[0049] S3. Place the lower mold core mold 3, which is covered with the preform, into the first groove 2-1 of the forming lower mold 2 in sequence, and place the intermediate mold 4, which is covered with the preform, onto the lower mold core mold 3.

[0050] S4. Mold Closure: Close the lower molding mold 2 and the upper molding mold 5, and simultaneously turn on electromagnetic induction heating (heating time 10-15 minutes) and set the pressure to 0.6-2.0 MPa for curing.

[0051] S5. After curing, cool down and open the mold;

[0052] S6. Demolding: Remove the cured composite material beam reinforcing rib 1 from the lower mold core mold 3 and the intermediate mold 4.

[0053] The composite inter-beam reinforcing ribs manufactured by this invention solve the problem of reduced strength and stiffness caused by openings in the web of the ribs. The composite inter-beam reinforcing ribs manufactured by this invention are produced using a rapid-curing prepreg molding process, enabling mass production.

[0054] The combined molding die designed in this invention can be used to quickly and in batches form the composite material beam reinforcing ribs of this invention. The formed composite material beam reinforcing ribs have smooth and flat inner and outer surfaces and high dimensional accuracy.

[0055] The lower mold core mold and intermediate mold in this invention can be quickly replaced in turn, improving production efficiency.

[0056] The above-described preferred embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of the invention. Any obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A molding die for forming reinforcing ribs between composite beams, characterized in that, The molding die is used to form the composite material beam inter-beam reinforcing rib (1). The composite material beam inter-beam reinforcing rib (1) is composed of a rib web (1-1) and a rib flange (1-2). The rib web (1-1) is provided with a number of reinforcing ribs (1-1-1). The rib web (1-1) is also provided with a number of lightening holes (1-1-2). The rib flange (1-2) is provided with flange recesses (1-2-1) for cooperating with the flange of the beam. The molding die includes: a lower molding die (2), a lower core mold (3), several intermediate molds (4), and an upper molding die (5); the lower molding die (2), the lower core mold (3), the several intermediate molds (4), and the upper molding die (5) are stacked in sequence to form a combined molding die; The lower mold (2) is provided with a first groove (2-1) in the middle that matches the shape of the lower mold core mold (3). The outer surface of the lower mold core mold (3) is completely matched with the inner surface of the reinforcing rib (1). The outer surface of the lower mold core mold (3) is provided with a second groove (3-1-1) corresponding to the reinforcing rib (1-1-1). The inner surface of the intermediate mold (4) matches the outer surface of the reinforcing rib (1). The outer surface of the intermediate mold (4) matches the inner surface of the reinforcing rib (1). The inner surface of the upper mold (5) matches the outer surface of the reinforcing rib (1). Both the lower mold core mold (3) and the intermediate mold (4) can be used as paving molds.

2. The composite material beam inter-beam reinforcing rib forming mold according to claim 1, characterized in that, The relief hole (1-1-2) is provided on the web plate (1-1) of the wing rib between two adjacent reinforcing ribs (1-1-1).

3. The composite material beam inter-beam reinforcing rib forming mold according to claim 1, characterized in that, The flange recess (1-2-1) is provided at the end of the wing rib flange (1-2).

4. The composite material beam inter-beam reinforcing rib forming mold according to claim 1, characterized in that, The forming mold is made of high-hardness mold steel.

5. A method for forming reinforcing ribs between composite beams, characterized in that, This method uses the molding die described in any one of claims 1 to 4 for molding, and the method includes the following steps: S1. Fix the lower molding die (2) on the lower platform of the molding machine, fix the upper molding die (5) on the upper platform of the molding machine, align the lower molding die (2) and the upper molding die (5), and start heating at the same time; S2. Prepreg is laid on the lower core mold (3) and the intermediate mold (4) respectively to form a preform; S3. Place the lower mold core mold (3) with the preform laid on it into the first groove (2-1) of the forming lower mold (2) in sequence, and place the intermediate mold (4) with the preform laid on it onto the lower mold core mold (3); S4. Mold closing: The lower molding mold (2) and the upper molding mold (5) are closed, and simultaneously heated and pressurized for curing; S5. After curing, cool down and open the mold; S6. Demolding: Remove the cured composite material beam reinforcing rib (1) from the lower core mold (3) and the intermediate mold (4).

6. The method for forming inter-beam reinforcing ribs of composite materials according to claim 5, characterized in that, The heating temperature in step S1 depends on the resin.

7. The method for forming inter-beam reinforcing ribs of composite materials according to claim 5, characterized in that, The pressure set in step S3 is 0.6 to 2.0 MPa.

8. The method for forming inter-beam reinforcing ribs of composite materials according to claim 5, characterized in that, The heating method used in step S3 is electromagnetic induction heating, and the heating time is 10 to 15 minutes.

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