Integrated T-shaped stiffened wallboard and forming tool thereof

Abstract

The utility model discloses an integrated T-shaped stiffened wallboard and a forming tool thereof. The integrated T-shaped stiffened wallboard comprises a skin and a plurality of stringers, and the skin and the stringers are of an integrated structure formed by hot pressing of multiple layers of composite prepreg tapes. The forming tool comprises an upper die, a lower die, a plurality of sliding blocks and a plurality of fixing clamps, the lower die is a U-shaped groove, the upper die is a flat plate matched with the lower die, the sliding blocks and the fixing clamps are in a long strip shape, the number of the fixing clamps is equal to the number of the sliding blocks plus 1, and the sliding blocks are placed in the lower die. Electric heating rods are uniformly arranged on the two vertical side edges of the upper mold and the lower mold and in the sliding blocks; the fixing clamps are detachably fixed to the vertical side edge of the lower die and the position over the sliding blocks in a one-to-one correspondence mode. All the electric heating rods are connected in parallel to a power supply device. According to the invention, the number of parts and the general assembly workload can be reduced, the process difficulty and cost are reduced, and better anti-stripping performance and bearing capacity are achieved, and higher popularization value is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of aircraft fuselage reinforced wall panels, and in particular relates to an integrated T-shaped reinforced wall panel and a forming tool thereof. Background Art

[0002] Among the existing fuselage composite reinforced wall panels, the T-type reinforced wall panel has a simple structure, good strength and rigidity, a small number of modules, and no need for special supporting equipment, a high manufacturing success rate, and a low production cost. Figure 1-2 As shown, in the conventional T-shaped stiffened wall panel, the skin 2 and the long stringer 1 are generally processed independently, and then connected by gluing and / or riveting. Among them, the manufacturing method of combining the finished long stringer with the finished skin by gluing and / or riveting not only has the problems of high mold cost, high molding cost, and long molding time, but also the connection strength between the two is not very high, and there is the possibility of separation of the long stringer and the skin. In view of this, it is very necessary to develop a technology for integrated manufacturing of stiffened wall panels to obtain a wall panel structure with integrated skin and long stringer. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model aims to provide an integrated T-shaped reinforced wall panel and a forming tool thereof.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] The integrated T-shaped stiffened wall panel comprises a skin and a plurality of long spars vertically distributed on the skin, wherein the skin and the long spars are an integrated structure formed by hot pressing multiple layers of composite material prepreg tapes together; wherein the skin is formed by hot pressing multiple layers of composite material prepreg tapes, and the long spars are formed by folding and extruding a portion of composite material prepreg tapes originating from the surface layer of the skin in a direction away from the remaining composite material prepreg tapes and then hot pressing.

[0006] Preferably, a plurality of long stringers are vertically distributed on the skin at equal intervals.

[0007] Preferably, in the skin, the ply angles of the multiple layers of composite prepreg tapes are symmetrical about the center of the skin.

[0008] Preferably, the composite material is a fiber-reinforced thermosetting resin composite material or a fiber-reinforced thermoplastic resin composite material.

[0009] The forming tooling of the integrated T-shaped reinforced wall panel comprises an upper mold, a lower mold, a plurality of sliders, and a plurality of fixing clamps, wherein the lower mold is a U-shaped groove, the upper mold is a flat plate matched with the lower mold, the sliders and the fixing clamps are both long strips, the number of fixing clamps = the number of sliders + 1, one of the fixing clamps is matched with the vertical side of the lower mold, and the remaining fixing clamps are matched with the slider, the slider is placed inside the lower mold in a manner that its length direction is parallel to the vertical side of the lower mold and the top surface of the slider is flush with the top surface of the lower mold; electric heating rods are evenly arranged on the two vertical sides of the upper mold and the lower mold and the inside of the slider; the fixing clamps are detachably fixed on the vertical side of the lower mold and the slider in a one-to-one correspondence; all electric heating rods are connected in parallel to the power supply device, and the power supply device is placed at an idle position outside the lower mold.

[0010] Preferably, in the upper mold, the electric heating rod is arranged parallel to the length direction of the upper mold; in the two vertical sides of the lower mold, the electric heating rods are arranged parallel to and / or perpendicular to the length direction of the lower mold, but in the same vertical side, the electric heating rods are parallel to each other; in the slider, the electric heating rods are arranged parallel to the length direction of the slider.

[0011] Beneficial effects: This application breaks the traditional mode that most of the aircraft fuselage wall panel structures are glued and / or riveted together with long stringers and skins, and creatively proposes an integrated wall panel structure of the aircraft fuselage, in which the long stringers and the skins are an integrated structure, which can not only reduce the number of parts and the workload of the final assembly, reduce the process difficulty and cost, but also the integrated wall panel structure has better anti-peeling performance and load-bearing capacity, and has a higher promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 : Schematic diagram of the top view of the traditional T-shaped reinforced wall panel;

[0013] Figure 2 : Schematic diagram of the longitudinal section structure of the traditional T-shaped reinforced wall panel;

[0014] Figure 3 : Schematic diagram of the top view of the integrated T-shaped reinforced wall panel of the utility model (after hot pressing);

[0015] Figure 4 : Schematic diagram of the longitudinal section structure of the integrated T-shaped reinforced wall panel of the utility model (before hot pressing);

[0016] Figure 5 : A schematic diagram of the structure of the molding tool of the utility model (power supply device omitted);

[0017] Figure 6 : A longitudinal cross-sectional diagram of the use state of the molding tool of the utility model (the power supply device and the electric heating rod are omitted);

[0018] Among them, the figure markings are: 1-long stringer; 2-skin; 3-slider; 4-lower mold; 51-first part of composite material prepreg tape, 52-first part of composite material prepreg tape; 6-fixing fixture; 7-upper mold; 8-electric heating rod. DETAILED DESCRIPTION

[0019] In order to make the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Example 1

[0021] like Figure 3-4 As shown, an integrated T-shaped stiffened wall panel includes a skin 2 and a plurality of long stringers 1 equally spaced and vertically distributed on the skin 2, the skin 2 and the long stringers 1 are an integrated structure formed by hot pressing multiple layers of composite material prepreg tapes together; wherein, the skin 2 is formed by hot pressing a first portion of composite material prepreg tapes 51 and a second portion of composite material prepreg tapes 52 from top to bottom, and the long stringers 1 are formed by folding and extruding a first portion of composite material prepreg tapes 51 originating from the surface layer of the skin 2 in a direction away from the second portion of composite material prepreg tapes 52 and then hot pressing; in the skin 2, the laying angles of the first portion of composite material prepreg tapes 51 and the second portion of composite material prepreg tapes 52 are symmetrical about the center of the skin 2; the first portion of composite material prepreg tapes 51 and the second portion of composite material prepreg tapes 52 are fiber reinforced thermoplastic resin composite material prepreg tapes.

[0022] Example 2

[0023] like Figure 5-6As shown, the forming tooling of the integrated T-shaped reinforced wall panel includes an upper mold 7, a lower mold 4, three sliders 3, and four fixing fixtures 6. The lower mold 4 is a U-shaped groove, and the upper mold 7 is a flat plate adapted to the lower mold 4. The slider 3 and the fixing fixture 6 are both long strips. One of the fixing fixtures 6 is adapted to the left vertical side of the lower mold 4, and the remaining fixing fixtures 6 are adapted to the slider 3. The slider 3 is placed inside the lower mold 4 in a manner that its length direction is parallel to the vertical side of the lower mold 4, and the top surface of the slider 3 is flush with the top surface of the lower mold 4; electric heating rods 8 are evenly arranged on the two vertical sides of the upper mold 7, the lower mold 4, and the inside of the slider 3: in the upper mold 7, the electric heating rod 8 is parallel to the left vertical side of the upper mold 7. The electric heating rod 8 is arranged in the length direction; in the left vertical side of the lower mold 4, the electric heating rod 8 is arranged parallel to the length direction of the lower mold 4, and in the right vertical side of the lower mold 4, the electric heating rod 8 is arranged perpendicular to the length direction of the lower mold 4; in the slider 3, the electric heating rod 8 is arranged parallel to the length direction of the slider 3; the fixing clamp 6 is detachably fixed on the left vertical side of the lower mold 4 and the slider 3 in a one-to-one manner (for example, bolt holes are arranged at the four corners of the top surface of the left vertical side of the lower mold 4 and the top surface of the slider 3, and bolts matching the bolt holes are arranged at the four corners of the bottom surface of the fixing clamp 6, and detachable fixation is achieved by relying on the cooperation of the bolts and the bolt holes); all the electric heating rods 8 are connected in parallel to the power supply device, and the power supply device is placed at an idle position outside the lower mold 4.

[0024] When in use: first, adjust the spacing distance between two adjacent sliders 3 and the spacing distance between the leftmost slider 3 and the left vertical side of the lower mold 4 to be the same and twice the height of the long stringer 1; secondly, on the left vertical side of the lower mold 4 and the top surface of the slider 3, lay the first part of the composite material prepreg tape 51 from bottom to top according to the laying angle and laying sequence of 0 / 45 / -45 / 0 (the width of the first part of the composite material prepreg tape 51 is smaller than the width of the slider 3 and the left vertical side of the lower mold 4, so that the composite material prepreg tape will not be damaged when the fixing fixture 6 is fixed), fix the fixing fixture 6 on the corresponding left vertical side of the lower mold 4 and the slider 3, so as to achieve the fixation of the first part of the composite material prepreg tape 51 between the two to ensure that it will not move horizontally; then, the rightmost slider 3 is pushed from right to left by the automatic motor. During the pushing process, the first part of the composite material prepreg tape 51 suspended between the rightmost slider 3 and the adjacent left slider 3 gradually bends downward. When the rightmost slider 3 moves When it reaches the left slider adjacent to it, the bent first part composite material prepreg tape 51 is completely folded, and the rightmost slider 3 is pushed to the left continuously until all the suspended first part composite material prepreg tapes 51 are bent downward and folded, the fixing fixture 6 is removed, and the rightmost slider 3 is clamped by an automatic motor; finally, the second part composite material prepreg tape 52 is laid on the surface of the first part composite material prepreg tape 51 from bottom to top according to the laying angle and laying sequence of 0 / -45 / 45 / 0, so that the laying of the entire skin 2 is completed (the overall laying of the skin 2 = the first part composite material prepreg tape 51 + the second part composite material prepreg tape 52, and the overall laying sequence of the skin 2 is 0 / 45 / -45 / 0 / 0 / -45 / 45 / 0), the upper mold 7 is placed, the power supply device is turned on, the electric heating rod 8 starts to work, the molding tool is placed in the press, the first part composite material prepreg tape and the second part composite material prepreg tape are hot-pressed together, and after the temperature of the molding tool drops to room temperature, the mold is opened for sampling to obtain the final product.

Claims

1. An integrated T-shaped stiffened wall panel comprises a skin and a plurality of long stringers vertically distributed on the skin, characterized in that: The skin and the long stringer are an integrated structure formed by hot pressing multiple layers of composite material prepreg tapes together: wherein the skin is formed by hot pressing multiple layers of composite material prepreg tapes, and the long stringer is formed by folding and extruding part of the composite material prepreg tapes originating from the surface layer of the skin in a direction away from the remaining composite material prepreg tapes and then hot pressing.

2. The integrated T-shaped reinforced wall panel according to claim 1, characterized in that: Several long stringers are evenly spaced and vertically distributed on the skin.

3. The integrated T-shaped reinforced wall panel according to claim 1, characterized in that: In the skin, the layup angles of the multi-layer composite prepreg tapes are symmetrical about the center of the skin.

4. The integrated T-shaped reinforced wall panel according to claim 1, characterized in that: The composite material is a fiber-reinforced thermosetting resin composite material or a fiber-reinforced thermoplastic resin composite material.

5. The forming tooling of the integrated T-shaped reinforced wall panel is characterized by: It includes an upper mold, a lower mold, a plurality of sliders, and a plurality of fixing clamps. The lower mold is a U-shaped groove, and the upper mold is a flat plate matched with the lower mold. The sliders and the fixing clamps are both long strips. The number of fixing clamps = the number of sliders + 1. The size of one of the fixing clamps is matched with the vertical side of the lower mold, and the size of the remaining fixing clamps is matched with the slider. The slider is placed inside the lower mold with its length direction parallel to the vertical side of the lower mold and the top surface of the slider is flush with the top surface of the lower mold. Electric heating rods are evenly arranged on the two vertical sides of the upper mold and the lower mold and the inside of the slider. The fixing clamps are detachably fixed on the vertical sides of the lower mold and the slider one by one. All electric heating rods are connected in parallel to the power supply device, and the power supply device is placed at an idle position outside the lower mold.

6. The forming tool for the integrated T-shaped reinforced wall panel according to claim 5, characterized in that: In the upper mold, the electric heating rod is arranged parallel to the length direction of the upper mold; in the two vertical sides of the lower mold, the electric heating rods are arranged parallel to and / or perpendicular to the length direction of the lower mold, but in the same vertical side, the electric heating rods are parallel to each other; in the slider, the electric heating rod is arranged parallel to the length direction of the slider.

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