Taper composite material T-shaped ring rib forming tool and forming method

Abstract

The invention discloses a forming tool and a forming method for a tapered composite T-shaped ring rib. The forming tool comprises a base, the lower core mold is arranged on the base and is provided with a molded surface matched with the inner surface of the lower L-shaped layer of the tapered composite material T-shaped ring rib; and the outer mold is arranged on the outer side of the lower core mold in a sleeving manner, is provided with a molded surface matched with the outer surface of the tapered composite material T-shaped ring rib, and is mounted on the base. Combined paving of the tapered composite T-shaped ring rib is achieved, the paving process is simplified, the forming pressure requirement of a workpiece is met through joint pressurization of bolts and vacuum bag pressure, the performance of the workpiece is improved, the interior and the exterior of the workpiece are film pasting faces, the apparent quality of the workpiece is improved, and the production cost is reduced. Meanwhile, the demolding screws are arranged, so that the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite material forming, and particularly relates to a forming tooling and forming method for a tapered composite material T-shaped ring rib. Background Art

[0002] Due to many advantages such as high specific strength, high specific stiffness, and strong designability, composite materials are widely used in the aerospace field. The stiffener is also a widely used strengthening structure in the fields of aviation and aerospace vehicles, etc. Generally, the stiffener is used in the direction perpendicular to the panel on the inner side of the structural shape to improve the stiffness and load-bearing capacity of the panel and the overall structure. The stiffener and the panel can be made into an integral structure, or can be connected together by means of bonding, riveting or fastener connection. Common stiffening forms include "L"-type, "C"-type, "Z"-type, "T"-type, "I"-type, "J"-type, "Ω"-type or hat-shaped ribs, etc.

[0003] The T-shaped ring rib of the composite material is a common reinforcing structure inside the cylindrical part. However, due to factors such as the difficulty of tooling design and manufacturing and the difficulty of forming process, the T-shaped ring rib mostly adopts an internal shape fitting die and an external shape bag surface combined die for forming. There are defects such as uneven vertical rib pressure and poor external shape quality in the forming of the T-shaped ring rib by such a die. Summary of the Invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a forming tooling and forming method for a tapered composite material T-shaped ring rib, which realizes the combined paving of the tapered composite material T-shaped ring rib, simplifies the paving process, and jointly pressurizes through bolts and vacuum bag pressing to meet the forming pressure requirements of the workpiece, improves the performance of the workpiece, the inner and outer surfaces of the workpiece are both film-lined surfaces, improves the appearance quality of the workpiece, and at the same time sets demoulding screws to improve production efficiency and reduce production costs.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: In the first aspect, a forming tooling for a tapered composite material T-shaped ring rib is provided, including: a base; a lower core mold installed on the base and having a surface matching the inner surface of the lower "L" layer of the tapered composite material T-shaped ring rib; an outer mold sleeved outside the lower core mold and having a surface matching the outer surface of the tapered composite material T-shaped ring rib, and the outer mold is installed on the base.

[0006] Further, the outer mold includes a forming body for forming the tapered composite material T-shaped ring rib and a flange for connecting the base.

[0007] Further, the height of the forming body is greater than the height of the lower core mold, and the part of the forming body protruding above the lower core mold forms a paving area for the upper "L" layer of the tapered composite material T-shaped ring rib with the upper surface of the lower core mold.

[0008] Furthermore, the flange is perpendicular to the axis of the molded body.

[0009] Furthermore, the outer mold is connected to the base by locking screws, and locking screw holes matching the locking screws are respectively provided on the flange and the base.

[0010] Furthermore, it further includes a pin for positioning the outer mold, and pin holes matching the pin are respectively provided on the flange and the base.

[0011] Furthermore, it further includes a demolding screw for demolding the outer mold, and a demolding screw hole matching the demolding screw is provided on the flange.

[0012] Furthermore, a plurality of lifting rings are respectively provided on the flange and the base.

[0013] In a second aspect, a method for forming a tapered composite material T-shaped ring rib is provided. The method uses the forming tooling for the tapered composite material T-shaped ring rib described in the first aspect. The method includes: manufacturing the lower "L" layer of the tapered composite material T-shaped ring rib on the lower core mold, and manufacturing the "ring" layer of the tapered composite material T-shaped ring rib on the outer side of the lower "L" layer; sleeving the outer mold on the outer side of the lower core mold and locking it with the base to form a pre-compression of the lower "L" layer of the tapered composite material T-shaped ring rib and the corresponding "ring" layer; manufacturing the upper "L" layer of the tapered composite material T-shaped ring rib on the upper surface of the lower "L" layer and the inner surface of the "ring" layer located above the lower "L" layer; performing vacuum bag molding by completely wrapping the area where the outer mold and the lower core mold are located; demolding to obtain the tapered composite material T-shaped ring rib.

[0014] Furthermore, fill the R-angle area formed by the lower "L" layer and the "ring" layer with a tucker strip.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention is provided with a lower core mold installed on a base and having a profile matching the inner surface of the lower "L" layer of the tapered composite material T-shaped ring rib; an outer mold sleeved on the outside of the lower core mold and having a profile matching the outer surface of the tapered composite material T-shaped ring rib. The laying process of the tapered composite material T-shaped ring rib is decomposed into the laying of the lower "L" layer, the laying of the upper "L" layer, and the laying of the "ring" layer, and pressure is applied in sections. That is, on the base, the lower core mold and the laid carbon fiber preform are completely wrapped for vacuum bagging. The lower half of the preform (the lower "L" layer) is pressurized by bolts and also by the vacuum bag. The upper half of the workpiece (the upper "L" layer) and the flange edge are pressurized by the vacuum bag. The whole workpiece is uniformly and reliably pressurized, realizing the combined laying of the tapered composite material T-shaped ring rib, simplifying the laying process, and jointly pressurizing by bolts and the vacuum bag to meet the forming pressure requirements of the workpiece, improving the performance of the workpiece. Both the inside and outside of the workpiece are film-coated surfaces, improving the appearance quality of the workpiece. At the same time, the setting of the demolding screw improves production efficiency and reduces production costs. Description of the Drawings

[0016] Figure 1 FIG. is a schematic structural view of a tapered composite material T-shaped ring rib in an embodiment of the present invention, where (a) is a three-dimensional view and (b) is a partial sectional view of (a); Figure 2 FIG. is an axonometric view of a forming tool for a tapered composite material T-shaped ring rib provided by an embodiment of the present invention; Figure 3 FIG. is a schematic diagram of the bag pressing principle of a forming method for a tapered composite material T-shaped ring rib provided by an embodiment of the present invention; Figure 4 FIG. is an exploded view of a forming tool for a tapered composite material T-shaped ring rib (including the tapered composite material T-shaped ring rib) provided by an embodiment of the present invention; In the figure: 1. Base; 2. Lower core mold; 3. Outer mold; 4. Demolding screw; 5. Locking screw; 6. Pin; 7. Lifting ring; 8. Tapered composite material T-shaped ring rib; 81. Lower "L" layer; 82. Upper "L" layer; 83. "Ring" layer; 9. Vacuum bag. Detailed Embodiments

[0017] The present invention will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0018] Embodiment 1 As Figures 1 to 4As shown in the figure, a forming tooling for a tapered composite material T-shaped ring rib includes: a base 1; a lower core mold 2 installed on the base 1 and having a surface matching the inner surface of the lower "L" layer 81 of the tapered composite material T-shaped ring rib 8; an outer mold 3 sleeved on the outside of the lower core mold 2 and having a surface matching the outer surface of the tapered composite material T-shaped ring rib 8, and the outer mold 3 is installed on the base 1.

[0019] The outer mold 3 includes a forming body for forming the tapered composite material T-shaped ring rib and a flange for connecting to the base 1. The height of the forming body is greater than the height of the lower core mold 2, and the part of the forming body protruding above the lower core mold 2 forms a laying area for the upper "L" layer 82 of the tapered composite material T-shaped ring rib 8 with the upper surface of the lower core mold 2. The flange is perpendicular to the axis of the forming body.

[0020] The outer mold 3 is connected to the base 1 by locking screws 5, and locking screw holes matching the locking screws 5 are respectively provided on the flange and the base 1.

[0021] Pin holes are respectively provided on the flange and the base 1, and the pin 6 is matched with the pin holes to position the outer mold 3, improving the forming accuracy and quality of the tapered composite material T-shaped ring rib.

[0022] A demolding screw hole is provided on the flange, and the demolding screw 4 is matched with the demolding screw hole to achieve rapid demolding, improving production efficiency and reducing production costs.

[0023] A number of lifting rings 7 are respectively provided on the flange and the base 1. The lifting rings on the flange are used for mold closing and demolding to improve production efficiency. The lifting rings 7 on the base 1 are used for the handling of the base 1.

[0024] During use, the cut carbon fiber prepreg is laid on the surface of the lower core mold 2 by a cutting machine. The laying layers are divided into a lower "L" layer 81 that fits the surface of the lower core mold 2 and a "ring" - shaped layer 83 that fits the outer mold 3. The upper half of the outer "ring" - shaped layer 83 of the outer circle is laid with a margin exceeding the height of the workpiece. The lower core mold 2 together with the above - laid carbon fiber prepreg is placed at the center position of the base 1 or the lower core mold 2 is placed at the center position of the base 1 before laying and then laid. The outer mold 3 is connected and fixed to the base 1 by the locking screws 5 and the pins 6. At the same time, the lower core mold 2 and the outer - circle carbon fiber prepreg are pre - compacted through the locking process of the outer mold 3. The "ring" - shaped layer 83 above the lower core mold 2 is outwardly unfolded and laid on the surface of the outer mold 3. The R - angle area formed by the lower "L" layer 81 and the "ring" - shaped layer 83 is filled with a tamping strip. Then, the upper "L" layer 82 is laid on the upper surface area of the lower "L" layer 81 and the inner surface area of the upper "ring" - shaped layer 83. Finally, the overall laying quality is inspected to complete the laying.

[0025] Such as Figure 3 、 Figure 4As shown in the figure, on the base 1, the die body and the laid carbon fiber preform are completely wrapped with a vacuum bag. In addition to the bolt pressure, the lower half of the preform is also subjected to the pressure of the vacuum bag 9. The upper half of the workpiece and the flange are both subjected to the pressure of the vacuum bag, and the overall pressure on the workpiece is uniform and reliable.

[0026] The workpiece is cured and formed by the autoclave process according to the curing system. After the cured and formed workpiece is taken out of the autoclave, when it is cooled to room temperature, the locking screws 5 and the pins 6 are removed. After the outer die 3 is lifted by screwing the demolding screw 4, it is disengaged from the small end of the workpiece along the axial direction of the formed body. After the lower core die 2 is cooled to room temperature, its volume shrinks by a certain size due to cold shrinkage, and considering the taper (draft angle) of the workpiece itself, it can be demolded by gently tapping with a rubber hammer.

[0027] The tooling of the present invention meets the forming requirements of the tapered composite T-shaped ring rib. The tooling adopts a combined laying method of the upper "L" layer, the lower "L" layer and the "ring" layer, which simplifies the laying process and improves the performance of the workpiece. 2 / 3 of the surface of the tooling of the present invention is a film-lined surface, and the forming quality is high. The tooling of the present invention uses the lower half bolt and vacuum bag pressure method for pressing, and the upper half uses the vacuum bag pressure method for pressing. The overall pressure on the workpiece is uniform and stable. Demolding is safely and reliably achieved by means of the demolding screw. The tooling is convenient for disassembly and assembly, simple to operate, light and flexible to handle. The requirements for the operation level of the operator are low, the operation is simple, and the labor intensity of the operator is greatly reduced. The tooling of the present invention uses machined parts and standard parts with simple configurations, etc. The overall structure is simple and compact, convenient for installation and maintenance, low in manufacturing cost, and reliable in operation.

[0028] Embodiment 2 Based on the forming tooling for the tapered composite T-shaped ring rib described in Embodiment 1, the present embodiment provides a forming method for the tapered composite T-shaped ring rib, including: Manufacture the lower "L" layer of the tapered composite T-shaped ring rib 8 on the lower core die 2, and manufacture the "ring" layer of the tapered composite T-shaped ring rib 8 on the outer side of the lower "L" layer; fill the R-angle area formed by the lower "L" layer and the "ring" layer with a wick strip.

[0029] Set the outer die 3 on the outside of the lower core die 2 and lock it with the base 1 to form a pre-compression of the lower "L" layer of the tapered composite T-shaped ring rib 8 and the corresponding "ring" layer.

[0030] Manufacture the upper "L" layer of the tapered composite T-shaped ring rib 8 on the upper surface of the lower "L" layer and the inner surface of the "ring" layer located above the lower "L" layer.

[0031] Perform vacuum bag forming by completely wrapping the area where the outer die 3 and the lower core die 2 are located.

[0032] Demold to obtain the tapered composite T-shaped ring rib 8.

[0033] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A forming tool for a tapered composite material T-shaped ring rib, characterized in that, Comprising: A base (1); A lower core mold (2) mounted on the base (1) and having a profile matching the inner surface of the lower "L" layer of the tapered composite material T-shaped ring rib (8); An outer mold (3) sleeved outside the lower core mold (2) and having a profile matching the outer surface of the tapered composite material T-shaped ring rib (8), and the outer mold (3) is mounted on the base (1).

2. The forming tooling for a tapered composite material T-shaped ring rib according to claim 1, characterized in that, The outer mold (3) includes a forming body for forming the tapered composite material T-shaped ring rib (8) and a flange for connecting the base (1).

3. The forming tooling for a tapered composite material T-shaped ring rib according to claim 2, characterized in that, The height of the forming body is greater than the height of the lower core mold (2), and the part of the forming body protruding above the lower core mold (2) forms a laying area for the upper "L" layer of the tapered composite material T-shaped ring rib (8) with the upper surface of the lower core mold (2).

4. The forming tooling for a tapered composite material T-shaped ring rib according to claim 2, wherein, The flange is perpendicular to the axis of the forming body.

5. The forming tooling for a tapered composite material T-shaped ring rib according to claim 2, wherein The outer mold (3) is connected to the base (1) by a locking screw (5), and locking screw holes matching the locking screw (5) are respectively provided on the flange and the base (1).

6. The forming tooling for the tapered composite material T-shaped ring rib according to claim 2, wherein, It further includes a pin (6) for positioning the outer mold (3), and pin holes matching the pin (6) are respectively provided on the flange and the base (1).

7. The forming tooling for a tapered composite material T-shaped ring rib according to claim 2, characterized in that, It further includes a demolding screw (4) for demolding the outer mold (3), and a demolding screw hole matching the demolding screw (4) is provided on the flange.

8. The forming tooling for the tapered composite material T-shaped ring rib according to claim 2, characterized in that, A plurality of lifting rings are respectively provided on the flange and the base (1).

9. A forming method for a tapered composite material T-shaped ring rib, characterized in that, Using the forming tool for the tapered composite material T-shaped ring rib according to any one of claims 1 to 8, the method includes: Manufacturing the lower "L" layer of the tapered composite material T-shaped ring rib (8) on the lower core mold (2), and manufacturing the "ring" shaped layer of the tapered composite material T-shaped ring rib (8) outside the lower "L" layer; Sleeving the outer mold (3) outside the lower core mold (2) and locking it with the base (1) to form a pre-compression of the lower "L" layer of the tapered composite material T-shaped ring rib (8) and the "ring" shaped layer corresponding to the lower "L" layer; Manufacturing the upper "L" layer of the tapered composite material T-shaped ring rib (8) on the upper surface of the lower "L" layer and the inner surface of the "ring" shaped layer located above the lower "L" layer; Performing vacuum bag molding by completely wrapping the area where the outer mold (3) and the lower core mold (2) are located; Demolding to obtain the tapered composite material T-shaped ring rib (8).

10. The forming method of the tapered composite material T-shaped ring rib according to claim 9, characterized in that, Filling the R-angle area formed by the lower "L" layer and the "ring" shaped layer with a wick strip.

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