Co-curing stiffened wallboard forming stringer end protection device

Abstract

The utility model discloses a co-curing stiffened wallboard forming stringer end protection device which comprises a base and a supporting frame connected to the base, a stringer tool is installed on the supporting frame, a forming die is further connected to the stringer tool, a plurality of stringer forming cavities are formed in the forming die, and the stringer forming cavities are communicated with the supporting frame. The stringer forming cavity extends to the end face of the forming die in the length direction of the forming die, the end of the stringer forming cavity is further connected with a soft die sliding block, and the soft die sliding block extends out of the stringer forming cavity. And the motion freedom degree of demolding of the end tool is higher, so that the demolding difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of composite material parts molding technology, and in particular to a protective device for the end of a long stringer in a co-cured reinforced wall panel molding process. Background Technology

[0002] Composite materials possess unique properties compared to metallic materials, including higher specific strength, higher specific modulus, better fatigue resistance, stronger corrosion resistance, and better high-temperature resistance. Therefore, the application of composite materials in the aerospace field is becoming increasingly widespread.

[0003] Composite material multi-curvature stiffened panels are widely used in large aircraft both domestically and internationally. These parts have complex structures and require intricate manufacturing processes. The main focus and challenges lie in the preforming of the composite material and the demolding of the parts after curing.

[0004] Due to the characteristics of composite part molding processes, molding fixtures are mostly made of steel. However, during the cooling process after the part has solidified, the steel undergoes slight shrinkage (the amount of shrinkage depends on the material used in the fixture). For composite panel parts with stringers, this shrinkage can compress the already solidified part, thus causing damage.

[0005] Therefore, it is necessary to design a protective device for the end of the long stringer in the co-curing reinforced wall panel molding process, which can effectively avoid demolding damage and end defects of the long stringer during wall panel curing. Utility Model Content

[0006] In order to overcome the shortcomings of the existing technology, this utility model provides a protection device for the end of a long stringer formed by co-curing reinforced wall panel.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a protective device for the end of a long stringer in a co-cured reinforced wall panel, comprising a base, a support frame connected to the base, a long stringer fixture connected to the support frame, a forming mold connected to the long stringer fixture, and a plurality of long stringer forming cavities on the forming mold, characterized in that the long stringer forming cavities extend along the length direction of the forming mold to the end face of the forming mold, and a soft film slider is connected to the end of the long stringer cavity, and the soft film slider extends out of the long stringer forming cavity.

[0008] Preferably, the soft film slider is wedge-shaped, and the upper surface of the soft film slider is flush with the surface of the forming mold.

[0009] Preferably, the bottom surface of the large end of the soft membrane slider abuts against the surface of the stringer cavity, and the two sides of the large end of the soft membrane slider abut against the two side surfaces of the stringer cavity.

[0010] Preferably, the soft membrane slider is made of silicone support material.

[0011] Preferably, the bottom surface and two sides of the soft film slider are connected to the end of the stringer forming cavity by high-temperature resistant adhesive.

[0012] The working principle of this utility model is as follows: when the part is demolded, the part is pushed to one side by an external push rod, while the tooling is pushed to the other side. In this way, the soft film slider will move synchronously along its own wedge-shaped slope, avoiding collision with the main tooling when the inner cavity of the stringer moves.

[0013] Compared with the prior art, the beneficial effects that this utility model can achieve are:

[0014] 1. The end of the stringer of this stringer end protection device is not constrained by the end metal body tooling. The soft film slider of the stringer end will move with the movement of the parts. Due to the existence of the draft angle, the end tooling has more freedom of movement for demolding, thereby reducing the difficulty of demolding.

[0015] 2. This stringer end protection device adds a split tooling for the stringer end, which greatly improves the operability of demolding the wall panel and isolates the deformation transmission of the main tooling to avoid quality defects at the stringer end during the molding process.

[0016] 3. The soft membrane slider in this stringer end protection device is made of a material with high elastic modulus and heat resistance, which avoids internal delamination and pores and other defects in composite materials caused by pressure damage to the composite parts. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a protective device for the end of a long stringer in the co-curing reinforced wall panel forming process.

[0018] Figure 2 This is a side view of the structural schematic diagram of a co-cured reinforced wall panel forming stringer end protection device.

[0019] Figure 3 This is a schematic diagram of the structure of a protective device for the end of a long stringer in the co-curing reinforced wall panel forming process.

[0020] Figure 4 This is a schematic diagram of the connection between the soft film slider and the long string forming cavity in a co-curing reinforced wall panel forming stringer end protection device.

[0021] Figure 5 This is a schematic diagram of the structure of the stringer forming cavity on the forming mold in a co-curing reinforced wall panel forming stringer end protection device.

[0022] The components include: 1. base; 2. support frame; 3. stringer tooling; 4. forming mold; 5. stringer forming cavity; 6. soft film slider; 7. push rod; 8. circumferential stop block. Detailed Implementation

[0023] The following is in conjunction with the instruction manual appendix. Figure 1-5 The technical solution of this utility model will be described through specific embodiments.

[0024] Example:

[0025] like Figures 1 to 5 As shown, the end protection device for the precast reinforced wall panel includes a base 1 and a support frame 2 connected to the base 1. There are two support frames 2, which are symmetrically arranged. A precast fixture 3 is connected between the two support frames 2. A forming mold 4 is also connected to the precast fixture 3. The parts are laid on the outer surface of the forming mold 4. The base 1 and the two support frames 2 can be used to support the entire fixture.

[0026] The long stringer fixture 3 is conical, with a large end and a small end. Several push rods 7 are connected to the side of the long stringer fixture 3. That is, on the side of the large end of the long stringer fixture 3, there is also a circumferential stop block connected to the end face of the part. The circumferential stop block is evenly distributed around the edge of the large end of the part and can act on the circumference of the part during demolding.

[0027] Since the stringer fixture 3 is conical, the forming mold 4, after being connected to the stringer fixture 3, is also conical in shape. The forming mold 4 has several stringer forming cavities 5, which are evenly distributed along the surface of the forming mold 4. In this way, the end of each stringer forming cavity 5 near the small end is flush with the edge of the forming mold 4, meaning that the end of the stringer forming cavity 5 near the small end is open.

[0028] At the end of the stringer cavity, a soft membrane slider 6 is connected. The large end of the wedge-shaped soft membrane slider 6 is connected to the end of the stringer cavity by high-temperature resistant adhesive, while the small end extends out of the stringer cavity. After the adhesive connection, the upper surface of the soft membrane slider 6 is flush with the surface of the forming mold 4, the bottom surface of the large end of the soft membrane slider 6 abuts against the surface of the stringer cavity, and the two sides of the large end of the soft membrane slider 6 abut against the two side surfaces of the stringer cavity.

[0029] The soft membrane slider 6 is supported by silicone or other highly elastic and heat-resistant materials.

[0030] Demolding principle: First, clean the wall panel forming tooling and soft mold slider and apply a release agent to assist demolding; then use a high-temperature resistant adhesive to glue the soft mold slider 6 to the end of the long string cavity of the forming mold 4; then lay and cure the composite material of the part.

[0031] When demolding is required, i.e., part demolding, the circumferential stop pushes the part towards the narrow opening on the right, while simultaneously pushing the tooling inside the support frame 2 towards the wide opening. As the part and tooling move slowly, the soft mold slider 6 moves synchronously along its own wedge-shaped ramp, preventing collision between the stringer's inner cavity and the main tooling. The stringer end is not constrained by the end metal main tooling. The end soft mold tooling moves with the part. Due to the draft angle, the end tooling has more freedom of movement during demolding, thus reducing the difficulty of demolding.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protective device for the end of a long stringer in a co-cured reinforced wall panel, comprising a base, a support frame connected to the base, a long stringer fixture mounted on the support frame, a forming mold connected to the long stringer fixture, and a plurality of long stringer forming cavities formed on the forming mold, characterized in that, The long string forming cavity extends to the end face of the forming die along the length direction of the forming die, and a soft film sliding block is further connected at the end of the long string forming cavity, and the soft film sliding block extends out of the long string forming cavity.

2. A co-cured stringer panel formed longeron end protector according to claim 1, wherein: The shape of the soft film sliding block is wedge-shaped, and the upper surface of the soft film sliding block is flush with the surface of the forming die.

3. A co-cured stringer panel formed longeron end protector according to claim 2, wherein: The bottom surface of the large end of the soft film sliding block abuts against the surface of the long string cavity, and the two side surfaces of the large end of the soft film sliding block abut against the two side surfaces of the long string cavity.

4. A co-cured stringer panel formed longeron end protector according to claim 3, wherein: The soft film sliding block is made of silica gel material.

5. A co-cured stringer panel formed longeron end protector according to claim 4, wherein: The sliding block bottom surface and the two side surfaces of the soft film sliding block are connected at the end of the long string forming cavity by high-temperature-resistant glue.

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