A composite material forming device and method based on a multi-layer structure of OOA technology

Abstract

The present invention provides a method for forming a composite material with a multi-layer structure based on OOA technology, including the steps of laying a mold layer, laying a multi-layer material layer, and applying a vacuum bag film layer; laying the multi-layer material layer includes a prepreg, a rigid foam layer, and a functional layer; and, when laying pre-jointed corners, also includes inserting a thickness control sheet at each joint, i.e., the corner laying area. The present invention has the beneficial effect of effectively solving the problem of difficult gap control by pre-positioning the gasket as described above and reserving different negative pressure compression and shrinkage gap values according to different situations.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite material preparation, and in particular relates to a composite material and an OOA preparation method thereof. Background Art

[0002] OOA process: This process uses oven curing and vacuum bagging of prepreg products, i.e., a composite curing process of prepreg and other functional materials out of the autoclave. This process offers advantages over traditional autoclave prepreg processes, such as greater flexibility, faster molding speed, and greater cost-effectiveness.

[0003] Currently, this technology has certain technical problems:

[0004] 1) When laying multiple layers of materials, when there is hard material laid and the shape is polygonal, gaps or arches are easily formed at the joints of the hard materials. This is especially true when splicing electromagnetic functional materials. The splicing quality directly determines their functional characteristics and is extremely demanding. The splicing gap usually needs to be controlled within 0.5mm. The error during splicing and the displacement deviation of the multi-layer structure after negative compression of the vacuum bag film lead to large cumulative errors and are difficult to control.

[0005] 2) For large-sized and irregular structures, the local negative pressure may be uneven during the molding process, which may cause a certain deviation between the local thickness of the product and the designed thickness. The thickness deviation will greatly affect the electromagnetic and other functional characteristics of the product. Summary of the Invention

[0006] The present invention provides a method and a forming device for preparing a composite material OOA with multi-layer corner paving and high-precision seamless splicing.

[0007] The technical solution of the present invention is:

[0008] A composite material forming method based on OOA technology with a multi-layer structure, comprising the steps of laying a mold layer, laying a multi-layer material layer and laying a vacuum bag film layer; the laying multi-layer material layer comprises a prepreg, a rigid foam layer and a functional layer;

[0009] When paving the pre-assembled corners, the process also includes inserting a thickness control piece into each joint, i.e., the corner paving area, to limit the position.

[0010] Furthermore, the thickness of the thickness-controlled sheet is 0.1 to 1.3 mm; the thickness of the total ply is 2 to 40 mm; and the thickness of a single hard block layer is 1 to 10 mm.

[0011] A composite material forming device with a multi-layer structure based on OOA technology includes a laying mold layer, a multi-layer material laying layer and a vacuum bag film layer; the multi-layer material laying layer includes a prepreg, a rigid foam layer and a functional layer; when pre-assembling corners, a thickness control sheet is inserted into each joint seam, i.e., the corner laying area.

[0012] Furthermore, the thickness of the thickness-controlled sheet is 0.1 to 1.3 mm; the thickness of the total ply is 2 to 40 mm; and the thickness of a single hard block layer is 1 to 10 mm.

[0013] The beneficial effect of the present invention is that by pre-setting the gasket as above and reserving different negative pressure compression and shrinkage gap values according to different situations, the problem of difficult-to-control gap is effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the multi-corner paving area of the present invention;

[0015] The arrow points to the direction B, which is the corner paving area;

[0016] Figure 2 This is a schematic diagram of a multi-corner local paving according to the present invention;

[0017] Figure 3 Schematic diagram of a typical multi-layer material laying;

[0018] Figure 4 Schematic diagram of thickness control sheet installation in the composite material forming method of the present invention;

[0019] 1- Mold; 2- Sealing putty; 3- Prepreg; 4- Release cloth; 5- Isolation film; 6- Breathable felt; 7- Vacuum bag; 8- Vacuum valve;

[0020] 31 - foam layer; 32 - functional material layer; 311 - control piece 1; 321 - control piece 2. DETAILED DESCRIPTION

[0021] The present invention will be further described with reference to the following figures:

[0022] See also Figure 1 , which is a typical multi-corner model in the prior art. The arrow points to the corner paving area in the direction B. The error during splicing and the displacement deviation of the multi-layer structure after the negative compression of the vacuum bag film will easily lead to large cumulative errors after molding and are difficult to control.

[0023] See also Figure 2 , which is a typical multi-angle mold forming schematic diagram of the prior art; it includes a mold 1; sealing putty 2; prepreg 3; release cloth 4; isolation film 5; breathable felt 6; vacuum bag 7 and vacuum valve 8.

[0024] See also Figure 3 , a typical multi-layer material laying diagram, a foam layer 31 and a functional material layer 32 are laid in the prepreg 3; the foam layer 31 and the functional material layer 32 are laid alternately.

[0025] See also Figure 4, is a schematic diagram of the multi-corner mold forming of the present invention. The multi-corner mold forming mainly includes a mold layer and a multi-corner material paving. The multi-corner material paving has a foam layer 31 and a functional material layer 32, wherein the foam layer 31 has a control piece 1 311 at the corner, and the functional material layer 32 has a control piece 2 321 at the corner; ... The Nth foam layer has a control piece N at the corner, and the Nth functional material layer has a control piece N+1 at the corner.

[0026] 1) For the splicing and laying of hard materials, each layer is designed, calculated and processed in advance on the computer, and a certain margin is reserved, and then manually refined and pre-assembled on site.

[0027] 2) During splicing, since the original technical solution has no control piece and cannot be completely pressed and compacted, there will be a certain amount of sinking during the subsequent vacuum negative pressure compaction, resulting in a reduction in diameter and circumference after final contraction. The splicing seam may bulge, but if there is a gap, it may cause splicing seam defects.

[0028] A thickness control piece is inserted into the seam, and the thickness of the thickness control piece should follow the following rules:

[0029]

[0030] Note: The thickness of a single layer of hard blocks generally does not exceed 10mm, and the total ply thickness does not exceed 40mm.

[0031] When laying materials, pre-insert thickness control sheets of corresponding thickness into the corner joints of each hard material according to the parameters in the table above, and reserve an appropriate amount of shrinkage gap. After the pre-laying is completed, remove the thickness control sheets and then use vacuum negative pressure to tighten and compact them.

Claims

1. A composite material forming method based on OOA technology with a multi-layer structure, comprising a layup mold layer, a multi-layer material layup layer and a vacuum bag film layer; characterized in that: Laying down the multi-layer material layup including prepreg, rigid foam layer and functional layer; When paving the pre-jointed corners, the step of inserting a thickness control sheet at each joint, i.e., the corner paving area, is also included; After the pre-laying is completed, take out the thickness control sheet and then compact it with vacuum negative pressure; The thickness of the thickness-controlling sheet is 0.1 to 1.3 mm; the thickness of the total ply is 2 to 40 mm; and the thickness of a single hard foam layer or functional layer is 1 to 10 mm.

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