An Automatic Filament Placement Path Planning Method for a Variable Cross-Section C-Beam with 0° Ply

Abstract

The present invention discloses a method for automatically planning the filament winding path of a variable cross-section C-shaped beam with a 0-degree ply. First, the filament winding path in the 0-degree direction of the beam part is generated according to the 0-degree direction of the designed ply coordinate system; then, the magnitude relationship between the included angle α between the center line of the R region of the C-shaped beam and the 0-degree direction of the designed ply coordinate system and the allowable fiber angle deviation β of the designed acceptance technical conditions is determined, and the filament winding paths in the upper flange region, the lower flange region, and all the filament winding paths passing through the R region are rotated by a certain angle within the allowable angle β of the acceptance technical conditions, so as to reduce the included angle between the filament winding path and the center line of the R region, meet the requirements of the automatic filament winding process, and improve the filament winding quality. The present invention reduces the movement stroke of each axis of the filament winding equipment, reduces the laying difficulty, thereby reducing fiber wrinkles and bridging defects, and further improving the surface quality after laying.

Description

Technical Field

[0001] This invention patent belongs to the technical field of composite material manufacturing, and specifically relates to a method for automatically planning the laying path of 0-degree ply for a variable cross-section C-beam. Background Art

[0002] The composite C-beam part is the main load-bearing component of an aircraft. The height of the web surface of this part changes randomly with the change of the wing shape, so the C-beam part mostly has a continuously changing cross-sectional shape. For the C-beam part, the 0-degree ply direction generally follows the beam length direction (wingspan direction). For a variable cross-section C-beam, when planning the laying path of the 0-degree unidirectional tape, since there is an angle between the unidirectional tape and the center line of the R area of the beam, when laying to the R area, the unidirectional tape will twist in this area and continue to extend and lay to the flange surface. For the beam part using the automatic fiber placement process, limited by factors such as the deformation ability of the pressure roller and the stroke of each axis of the equipment, the unidirectional tape laid along this laying path is prone to wrinkles and bridging defects after laying, and this kind of laying path cannot meet the high-quality automatic fiber placement forming requirements for the 0-degree ply of the variable cross-section C-beam. Summary of the Invention

[0003] To solve the above problems, the present invention provides a method for automatically planning the laying path of 0-degree ply for a variable cross-section C-beam. By adjusting the laying direction of the laying path of the C-beam within the allowable angle deviation range of the design, the angle between the laying direction of the laying path and the center line direction of the R area of the C-beam is reduced to improve the laying quality of the R area.

[0004] This invention patent is realized through the following technical solutions:

[0005] A method for automatically planning the laying path of 0-degree ply for a variable cross-section C-beam includes the following steps:

[0006] Step 1: Generate the laying path of the 0-degree direction of the beam part according to the 0-degree direction of the laying coordinate system given by the design;

[0007] Step 2: Measure the angle α between the center line of the R area of the C-beam and the 0-degree direction of the design laying coordinate system. The allowable fiber angle deviation of the design acceptance technical conditions is β. Determine the size relationship between α and β. If α ≤ β, then go to Step 3; if α > β, then go to Step 4;

[0008] Step 3: Rotate the upper flange area, the lower flange area, and all the laying paths passing through the R area by the angle α, so that the directions of the upper flange area, the lower flange area, and all the laying paths passing through the R area are parallel to the center line of the R area, and complete the planning of the laying path;

[0009] Step 4 rotates the upper flange area, the lower flange area, and all the fiber placement paths passing through the R area by an angle β, reducing the angle between the fiber placement paths in the upper flange area, the lower flange area, and all the fiber placement paths passing through the R area and the center line of the R area, thus completing the planning of the fiber placement paths.

[0010] Furthermore, for the said Step 1, the specific process is: generating the fiber placement path in the 0-degree direction of the beam part according to the designed layup coordinate system.

[0011] Furthermore, the tolerance of the rotation angle β of the fiber placement path is where γ is the deviation of the laying angle of the equipment.

[0012] Furthermore, the number of tows of the fiber placement path passing through the R area is less than the maximum number of tows that the fiber placement equipment can lay simultaneously.

[0013] The beneficial effects of the present invention are:

[0014] By adjusting the fiber placement path direction near the R area of the C-shaped beam within the allowable fiber placement path angle deviation range of the design acceptance technical conditions, reducing the angle between the fiber placement path direction and the center line of the R area of the C-shaped beam, the compaction degree of the pressure roller is improved, the stroke of each axis of the fiber placement equipment is reduced, the laying difficulty is lowered, and fiber wrinkles and bridging defects are reduced, thereby improving the surface quality after laying. Brief Description of the Drawings

[0015] Figure 1 Schematic diagram of the part.

[0016] Figure 2 Schematic diagram of the plane unfolding of the part.

[0017] Figure 3 Schematic diagram of the original fiber placement path.

[0018] Figure 4 Schematic diagram of the fiber placement path after adjustment in Step 3.

[0019] Figure 5 Schematic diagram of the fiber placement path after adjustment in Step 4.

[0020] Explanation of the numbers in the figure: 1 - 0-degree direction of the layup coordinate system, 2 - center line of the R area, 3 - upper flange area, 4 - lower flange area, 5 - R area, 6 - part. Detailed Description of the Preferred Embodiment

[0021] As Figures 1-5 shown, in this example, the part to be fiber placed is as Figure 1 shown, and the shape after the plane unfolding of the part is as Figure 2 shown.

[0022] The fiber placement path is planned through the present invention:

[0023] Step 1: Generate the fiber placement path in the 0-degree direction of the beam part according to the 0-degree direction 1 of the ply coordinate system given by the design. The generated original fiber placement path is as shown in Figure 3 shown below.

[0024] Step 2: Measure the angle α between the center line 2 of the R area of the C-shaped beam and the 0-degree direction of the ply coordinate system. Assume that the allowable fiber angle deviation in the design acceptance technical conditions is β. Determine the size relationship between α and β. If α ≤ β, go to Step 3; if α > β, go to Step 4.

[0025] Step 3: Rotate the fiber directions of the upper flange area 3, the lower flange area 4, and all fiber placement paths passing through the R area 5 by the angle α, so that the fiber directions of the upper flange area 3, the lower flange area 4, and all fiber placement paths passing through the R area 5 are parallel to the center line of the R area, and complete the planning of the fiber placement path, as shown in Figure 4 shown below.

[0026] Step 4: Rotate the fiber directions of the upper flange area 3, the lower flange area 4, and all fiber placement paths passing through the R area 5 by the angle β, so that the included angle between the fiber directions of the upper flange area, the lower flange area, and all fiber placement paths passing through the R area and the center line of the R area is reduced, and complete the planning of the fiber placement path, as shown in Figure 5 shown below.

[0027] The tolerance of the fiber placement path rotation angle β is where γ is the laying angle deviation of the equipment.

[0028] The number of tows of the fiber placement path passing through the R area is less than the maximum number of tows that the fiber placement equipment can lay simultaneously.

[0029] In the implementation process of the above solution, compared with the traditional automatic fiber placement path planning method, it can adjust the fiber placement path direction near the R area of the C-shaped beam within the allowable fiber placement path angle deviation range of the design acceptance technical conditions, reduce the included angle between the fiber placement path direction and the center line of the R area of the C-shaped beam, improve the compaction degree of the pressure roller, reduce the stroke of each axis of the fiber placement equipment, reduce the laying difficulty, reduce fiber wrinkles and bridging defects, thereby improving the surface quality after laying.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. It should be noted that any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic fiber placement path planning method for a variable cross-section C-shaped beam with 0-degree ply, characterized in that It includes the following steps: In step 1, generate the wire laying path in the 0-degree direction of the beam part according to the 0-degree direction of the laying coordinate system given by the design; In step 2, measure the included angle α between the center line of the R area of the C-shaped beam and the 0-degree direction of the designed laying coordinate system. The allowable fiber angle deviation in the design acceptance technical conditions is β. Determine the size relationship between α and β. If α ≤ β, go to step 3; if α > β, go to step 4; In step 3, rotate the wire laying paths in the upper flange area, lower flange area and all paths passing through the R area by the angle α, so that the directions of the wire laying paths in the upper flange area, lower flange area and all paths passing through the R area are parallel to the center line of the R area, and complete the planning of the wire laying path; In step 4, rotate the directions of the wire laying paths in the upper flange area, lower flange area and all paths passing through the R area by the angle β, so that the included angle between the directions of the wire laying paths in the upper flange area, lower flange area and all paths passing through the R area and the center line of the R area is reduced, and complete the planning of the wire laying path.

2. The automatic fiber placement path planning method for a variable cross-section C-shaped beam with 0-degree ply as claimed in claim 1, wherein For the said step 1, the specific process is: generate the wire laying path in the 0-degree direction of the beam part according to the laying coordinate system given by the design.

3. The automatic fiber placement path planning method for a variable cross-section C-shaped beam with 0-degree ply according to claim 1, characterized in that The tolerance of the winding path rotation angle β is where γ is the laying angle deviation of the equipment.

4. A method for automatically planning the filament winding path of a variable cross-section C-shaped beam with 0-degree layup according to claim 1, characterized in that The number of tows of the wire laying path passing through the R area is less than the maximum number of tows that the wire laying equipment can lay simultaneously.

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