WO2021035941A1

WO2021035941A1 - Wall plate structure for composite-material stringer in shape of chinese character "工", and forming mold and forming method

Info

Publication number: WO2021035941A1
Application number: PCT/CN2019/114632
Authority: WO
Inventors: 丛晶洁; 李星; 温顺达; 李梦琳; 黄豪杰; 王杰
Original assignee: 中国商用飞机有限责任公司北京民用飞机技术研究中心; 中国商用飞机有限责任公司
Priority date: 2019-08-23
Filing date: 2019-10-31
Publication date: 2021-03-04
Also published as: CN110450937A; CN110450937B

Abstract

Disclosed is a wall plate structure for a composite-material stringer in the shape of the Chinese character "工", comprising several "C"-shaped overlays (5), an intermediate intercalation layer (6), a flange intercalation layer (8) and a skin overlay (10), wherein the "C"-shaped overlays (5) are laid side by side on the skin overlay (10), and closed portions of the "C"-shaped overlays (5) are in curing connection with the skin overlay (10); the intermediate intercalation layer (6) is provided in a gap between adjacent "C"-shaped overlays (5), and the intermediate intercalation layer (6) is in curing connection with the skin overlay (10); and the flange intercalation layer (8) is provided on the tops of the "C"-shaped overlays (5) and the intermediate intercalation layer (6) to jointly form an upper flange of a stringer in the shape of the Chinese character "工". A forming mold and forming method for the wall plate structure for a composite-material stringer in the shape of the Chinese character "工" are further disclosed. The "C"-shaped overlays and skin overlay of the wall plate structure for a composite-material stringer in the shape of the Chinese character "工" are completely attached, thus a bonding area is expanded and the bearing capacity of a stringer is increased while the amount of stringers manufactured is reduced. A detachable mold is used to support the "C"-shaped overlays, and thereby the problem of de-moulding of a composite-material stringer in the shape of the Chinese character "工" is solved, such that preparation of the stringer structure can be rapidly realized.

Description

Composite material "I" type long truss wall panel structure, molding die and molding method

Technical field

The invention relates to the technical field of aircraft composite materials, in particular to a composite material "I"-shaped long truss wall panel structure, a forming mold and a forming method.

Background technique

The composite material "I" type long truss stiffened wall panel is widely used in the main bearing structure of the fuselage, especially the airfoil wall panel structure. The common "work" type long truss structure is shown in Figure 1.

The main problems of the traditional structure are as follows:

1. Compared with the T-shaped long truss siding, the "worker" long truss siding has higher structural efficiency, and its bending resistance and the impact resistance of the long truss edge are improved;

2. In the existing "work" type long truss wall panel structure design, sufficient margins must be reserved for the upper and lower flanges to meet the processing requirements of the manufacturing boundary;

3. The glued area margin of the traditional "work" type long truss reinforced wall panel is small, which affects the overall wall panel structure when degumming.

Summary of the invention

One of the objectives of the present invention is to overcome the shortcomings of the prior art, and provide a composite material "I"-shaped long-truss wall panel structure, forming mold and forming method, which can reduce the waste of raw materials, improve the laying efficiency, and reduce the cost of tooling preparation. , Improve the quality of the glued joint between the bottom layer of the long stringer and the skin to ensure the quality and accuracy of the product.

The present invention adopts the following technical solutions:

A composite material "I" type long truss wall panel structure is used for aircraft wing surface panels. The composite material "I" type long truss wall panel structure includes a "C" type ply, a middle intercalation layer, and a flange intercalation layer. And skin layup;

A plurality of the "C" type plies are laid side by side and parallel on the skin pavement, the closed part of the "C" type pavement is flat, and the closed part is solidified and connected to the skin pavement ; A gap is left between the two adjacent "C"-type paving layers, the intermediate interlayer is set in the gap, and the middle interlayer and the "C"-type paving layer and the skin paving layer Are solidified and connected; the flange intercalation layer is arranged on the top of the "C"-shaped layer and the middle interlayer to form the upper flange of the "I"-shaped long truss; the flange intercalation layer and the "C" The top of the ”-type ply and the middle interlayer are solidified and connected.

Further, a co-curing or co-bonding process is adopted between the "C"-shaped ply, middle intercalation, flange intercalation and skin ply to achieve integral curing and molding.

Further, the "C"-shaped plies at both ends of the long truss wall structure are all semi-C-shaped.

A molding die for the above-mentioned composite material "I"-shaped long-truss wall structure includes:

"C" type ply forming tooling, used to lay up and form "C" type ply;

Flange tooling, used to lay up and form the upper flange of the "work"-shaped long truss;

The skin tooling is used to lay up the skin layer and realize the solidified connection between the "C" type layer and the skin layer.

Further, the "C" type ply forming tooling includes a detachable left block, a right block, an upper block and a lower block;

The lower stopper is an inverted T-shaped block; the left stopper and the right stopper each include a body and a protrusion, and the left stopper and the right stopper are symmetrically supported on the wings of the lower stopper through the protrusions On the edge surface; the upper stop is arranged on the upper part of the lower stop; the left stop, the right stop, the upper stop and the lower stop can be closely fitted into a whole;

The "C"-shaped ply is preformed by the outer periphery of the left block body, the upper block and the right block body.

Further, the flange tooling and the skin tooling are both flat-plate structures.

Further, the upper and lower blocks are correspondingly provided with positioning mechanisms; the positioning mechanism is a groove and a protrusion corresponding to the groove;

When the upper stop is provided with the groove, the lower stop is provided with the corresponding protrusion; when the lower stop is provided with the groove, the upper stop is provided with the corresponding protrusion head.

A method for forming composite material "I"-shaped long-truss wall panel structure, using the above-mentioned forming mold, includes the following steps:

S1, the left block, the right block, the upper block and the lower block together form a "C"-shaped ply forming tool, which is used for the lay-up and molding of a single "C"-shaped ply; keep the "C"-shaped ply and The relative position of the "C" type ply forming tooling remains unchanged, and the "C" type ply and the "C" type ply tool form the first combination;

S2. A plurality of the first composite bodies are placed side by side in parallel, an intermediate interlayer is arranged between the adjacent "C"-shaped pavements, and the R zone is filled with twisted strips to form a second composite body; the R zone Is the gap formed between the "C" type ply and the intermediate interlayer; then the second assembly is turned over 180° as a whole;

S3. Pull the lower stopper away, keep the relative position of the left stopper, right stopper, upper stopper and "C" type paving unchanged; place the flange interposer and flange tooling according to the design to form the third assembly ；

S4. Position the third combination body and the skin tooling, then combine with the skin layer, and complete the overall co-curing molding after vacuum packaging.

Further, the molding method further includes:

S5. When removing the "C"-shaped ply forming tooling, first remove the upper stopper, and then remove the left stopper and the right stopper.

Further, in step S2, firstly, a plurality of the first combined bodies are turned by 180°, and then an intermediate interlayer is set between the adjacent "C"-shaped pavements to obtain the second combined body.

The present invention also provides an aircraft which uses the above-mentioned composite material "I" type long-truss wall structure.

The beneficial effects of the present invention are: the "C"-shaped ply is completely attached to the skin ply, and the glued area is much larger than that of the traditional I-shaped long truss stiffened wall panel, which increases the bearing capacity of the long truss while reducing The processing volume of the long stringer is effectively avoided, and the problem of the entire wall panel structure due to the long stringer degumming is effectively avoided; the co-curing or co-bonding process can be used to complete the overall curing and forming of the wall panel structure, which greatly improves the manufacturing efficiency. Reduce the loss rate of composite materials; use detachable molds to support the "C"-shaped ply, which solves the problem of demoulding of the composite material "I"-shaped long truss, and can quickly realize the preparation of the long truss structure; the process of the present invention is simple and easy to implement , Has great promotion value.

Description of the drawings

Figure 1 shows the structure of the traditional "I" type long truss wall panel.

Fig. 2 is a schematic diagram showing the structure of a composite "I"-shaped long truss wall panel according to an embodiment of the present invention.

Figure 3 shows a schematic diagram of the "C" type ply forming tooling.

Figure 4 shows a schematic diagram of the structure of the second assembly.

Figure 5 shows a schematic diagram of the structure of the third assembly.

Figure 6 shows the demolding schematic diagram of the composite material "I"-shaped long truss wall structure core mold.

Figure 7 shows a schematic diagram of the structure of the left block (right block).

In the picture: 1-left stop; 2-upper stop; 3-right stop; 4-lower stop; 5-"C" type pavement; 6-middle interlayer; 7-R corner filler; 8 -Flange intercalation; 9-flange tooling; 10-skin layup; 11-skin tooling; 101-body; 102-protrusion.

detailed description

Hereinafter, specific embodiments of the present invention will be described in detail with reference to specific drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be regarded as isolated, and they can be combined with each other to achieve better technical effects.

As shown in Figure 2, a composite "I"-shaped long-truss siding structure in an embodiment of the present invention includes several "C"-shaped plies 5, intermediate interlayers 6, flange interlayers 8 and skin plies. 10; A number of the "C" type paving layer 5 is laid side by side and parallel on the skin paving layer 10, the closed part of the "C" type paving layer 5 is flat, the closed part and the cover The skin layer 10 is solidified and connected; a gap is left between the two adjacent "C"-shaped layers 5, and the middle interlayer 6 is arranged in the gap, and the bottom of the middle interlayer 6 is connected to the The skin layer 10 is solidified and connected; the flange intercalation layer 8 is arranged on the top of the "C"-shaped pavement 5 and the middle interlayer 6 to jointly form the upper flange of the "I"-shaped long truss; the convex The edge intercalation layer 8 is solidified and connected to the tops of the "C"-shaped pavement 5 and the middle intercalation layer 6.

Preferably, a co-curing or co-bonding process is adopted between the "C"-shaped pavement 5, the intermediate intercalation layer 6, the flange intercalation layer 8 and the skin paving layer 10 to achieve integral curing and molding.

The "C"-shaped ply 5 at both ends of the long truss wall structure are all half C-shaped (half or part of the complete "C"-shaped ply), and the flange intercalation 8 ends (with the skin ply 10. Fill the R-angle filler 7 in the R-angle gap formed by the "C"-shaped ply 5).

The embodiment of the present invention can be automatically laid or laid by hand. Compared with the original "I" type long truss wall panel structure design, the effective bonding area of the long truss and the skin structure is increased, and the load-bearing capacity of the long truss is increased. At the same time, the processing amount of the long stringer is reduced.

As shown in Fig. 3, an embodiment of the present invention has a molding die for the above-mentioned composite material "I"-shaped long truss wall structure, including:

The "C" type ply forming tooling is used to lay up and form the "C" type ply 5; preferably, the "C" type ply forming tool includes a detachable left block 1, a right block 3, The upper stop 2 and the lower stop 4; the lower stop 4 is an inverted T-shaped block; the left stop 1 and the right stop 3 both include a body 101 and a protrusion 102, as shown in FIG. 7 (body 101 Used for forming the "C"-shaped ply 5, the protrusion 102 is used for the paving and positioning of the flange insert 8 and the flange tooling 9), the left block 1 and the right block 3 are all symmetrical by the protrusion 102 Supported on the flange surface of the lower stop 4; the upper stop 2 is arranged on the upper part of the lower stop 4; the left stop 1, the right stop 3, the upper stop 2 and the lower stop 4 can be tightly fitted into a whole; the "C"-shaped ply 5 is pre-formed by the outer periphery of the left block body, the upper block 2, and the right block body

Flange tooling 9 is a flat structure, used to lay up and form the upper flange of the "work"-shaped long truss;

The skin tooling 11 is a flat structure, used to lay up the skin layer 10 and realize the solidified connection between the "C" type layer 5 and the skin layer 10.

Preferably, the upper block 2 and the lower block 4 are provided with a positioning mechanism corresponding to; the positioning mechanism is a groove and a protrusion corresponding to the groove; when the upper block 2 is provided with the groove , The lower stop 4 is provided with the corresponding protrusion; or when the lower stop 4 is provided with the groove, the upper stop 2 is provided with the corresponding protrusion.

The molding die provided by the invention solves the problem of demoulding of the composite material "I"-shaped long truss, can quickly realize the preparation of the long truss structure, and improves the production efficiency of the long truss molding.

An embodiment of the present invention is a method for forming a composite material "I"-shaped long-truss wall panel structure, using the above-mentioned forming mold, and includes the following steps:

S1, the left stop 1, the right stop 3, the upper stop 2 and the lower stop 4 together form a "C"-shaped ply forming tool, which is used to form a single "C"-type ply 5 (and later and Curing and molding of the skin layer 10 after the integral combination); the matching structure between the left block 1, the right block 3 and the lower block 4, and the cooperation between the groove and the convex head between the upper block 2 and the lower block 4 The structure ensures that the overall fit clearance of the combined molding tooling meets the requirements; the relative position of the "C" type ply 5 and the "C" type ply molding tool remains unchanged, and the "C" type ply 5 and the "C" type pavement Layer tooling forms the first assembly; as shown in Figure 3;

S2. A plurality of the first combination bodies are placed side by side in parallel, an intermediate interlayer 6 is arranged between the adjacent "C"-shaped plies 5, and the R zone is filled with twisted strips to form a second combination body; The R zone is the gap formed between the "C" type ply 5 and the intermediate intercalation layer 6; then the second assembly is turned over 180° as a whole (it can also be used to first set a number of the first assembly Turn over 180°, and then set an intermediate interlayer 6 between the adjacent "C"-shaped plies 5 to obtain the second combination); as shown in FIG. 4;

S3. Pull out the lower stop 4 and keep the relative positions of the left stop 1, right stop 3, upper stop 2 and "C" type pavement 5 unchanged; place the flange insert 8 and flange tooling according to the design 9. Form a third combination; as shown in Figure 5;

S4. Position the third combination body and the skin tooling 11, then combine it with the skin layup 10, and complete the overall co-curing molding after vacuum packaging, as shown in Figure 5;

Aiming at the problem of difficult demolding of the I-shaped long truss co-cured wall panel structure, this application also designs the demolding process S5 in which the "C"-shaped ply forming tooling is removed separately as shown in FIG. 6: the removal of the "C" When forming a tooling for the ”-shaped ply, first remove the upper block 2, and then remove the left block 1 and the right block 3.

Although several embodiments of the present invention have been given herein, those skilled in the art should understand that the embodiments herein can be changed without departing from the spirit of the present invention. The above-mentioned embodiments are only exemplary, and the embodiments herein should not be used as a limitation to the scope of the present invention.

Claims

A composite material "I" type long truss wall panel structure, which is characterized in that it includes a "C" type ply, a middle intercalation, a flange intercalation and a skin ply;

A plurality of the "C" type plies are laid side by side and parallel on the skin pavement, the closed part of the "C" type pavement is flat, and the closed part is solidified and connected to the skin pavement ; A gap is left between the two adjacent "C"-type paving layers, the intermediate interlayer is set in the gap, and the middle interlayer and the "C"-type paving layer and the skin paving layer Are solidified and connected; the flange intercalation layer is arranged on the top of the "C"-shaped layer and the middle interlayer to form the upper flange of the "I"-shaped long truss; the flange intercalation layer and the "C" The top of the ”-type ply and the middle interlayer are solidified and connected.
The composite material "I"-shaped long-truss wall panel structure according to claim 1, wherein the "C"-shaped ply, the middle interlayer, the flange interlayer and the skin ply are co-cured. Or co-bonding process to achieve overall solidification molding.
The composite "I"-shaped long-truss wall structure according to claim 1, wherein the "C"-shaped plies at both ends of the long-truss wall structure are all semi-C-shaped.
A molding die for composite material "I"-shaped long truss wall panel structure according to any one of claims 1 to 3, characterized in that it comprises:

"C" type ply forming tooling, used to lay up and form "C" type ply;

Flange tooling, used to lay up and form the upper flange of the "work"-shaped long truss;

The skin tooling is used to lay up the skin layer and realize the solidified connection between the "C" type layer and the skin layer.
5. The forming mold according to claim 4, wherein the "C"-shaped ply forming tooling includes a detachable left block, a right block, an upper block and a lower block;

The lower stopper is an inverted T-shaped block; the left stopper and the right stopper each include a body and a protrusion, and the left stopper and the right stopper are symmetrically supported on the wings of the lower stopper through the protrusions On the edge surface; the upper stop is arranged on the upper part of the lower stop; the left stop, the right stop, the upper stop and the lower stop can be closely fitted into a whole;

The "C"-shaped ply is preformed by the outer periphery of the left block body, the upper block and the right block body.
5. The molding die of claim 5, wherein the flange tooling and the skin tooling are both flat-plate structures.
5. The molding die of claim 5, wherein the upper and lower blocks are provided with positioning mechanisms corresponding to each other; the positioning mechanism is a groove and a protrusion corresponding to the groove;

When the upper stop is provided with the groove, the lower stop is provided with the corresponding protrusion; when the lower stop is provided with the groove, the upper stop is provided with the corresponding protrusion head.
A method for forming composite material "I"-shaped long truss wall panel structure, characterized in that using the forming mold as claimed in claim 5 or 6, comprises the following steps:

S1, the left block, the right block, the upper block and the lower block together form a "C"-shaped ply forming tool, which is used for the lay-up and molding of a single "C"-shaped ply; keep the "C"-shaped ply and The relative position of the "C" type ply forming tooling remains unchanged, and the "C" type ply and the "C" type ply tool form the first combination;

S2. A plurality of the first composite bodies are placed side by side in parallel, an intermediate interlayer is arranged between the adjacent "C"-shaped pavements, and the R zone is filled with twisted strips to form a second composite body; the R zone Is the gap formed between the "C" type ply and the intermediate interlayer; then the second assembly is turned over 180° as a whole;

S3. Pull the lower stopper away, keep the relative position of the left stopper, right stopper, upper stopper and "C" type paving unchanged; place the flange interposer and flange tooling according to the design to form the third assembly ；

S4. Position the third combination body and the skin tooling, then combine with the skin layer, and complete the overall co-curing molding after vacuum packaging.
8. The molding method of claim 8, wherein the molding method further comprises:

S5. When removing the "C"-shaped ply forming tooling, first remove the upper stopper, and then remove the left stopper and the right stopper.
The molding method according to claim 8 or 9, characterized in that, in step S2, first a plurality of the first combined body is turned 180°, and then the adjacent "C"-shaped plies are set up Intercalation in the middle to obtain the second combination.