Composite box and method for forming a composite box

Abstract

The present application relates to the ply of a composite box, in particular to a composite box and a forming method of the composite box. The ply material of the composite box comprises an intermediate connecting part for forming a connecting rib plate. The ply material corresponding to the position for forming the connecting rib plate is in a "U" shape, having an inner side fitting part as a part of an inner skin, an outer side fitting part as a part of an outer skin, and a rib plate part connected between the inner side fitting part and the outer side fitting part, the rib plate part corresponding to the bottom wall of the "U" shape for forming the connecting rib plate. The inner skin is formed by an inner skin inner side part on the side close to the center of the box and the inner side fitting part, and the outer skin is formed by an outer skin outer side part on the side far away from the center of the box and the outer side fitting part. The present application can solve the problems of low connecting strength, low efficiency and high cost of the composite box with connecting rib plate in the prior art.

Description

Technical Field

[0001] This invention relates to the layup of composite material boxes, and particularly to a composite material box and a method for molding the composite material box. Background Technology

[0002] Lightweighting of equipment has been a long-term goal pursued in many fields and has therefore received widespread attention. Advanced composite materials, with high-performance carbon fiber composites as a typical example, have played an irreplaceable role in many important fields as structural, functional, or integrated structural / functional materials. The composite products manufactured from them have excellent properties such as lightweight, high strength, high stiffness, excellent vibration damping, fatigue resistance, and corrosion resistance.

[0003] A typical structure for existing composite material housings involves using an inner skin and an outer skin as the inner and outer walls of the housing, with an intermediate connecting structure linking the inner and outer skins together. For example, patent document CN112291963B discloses a composite material housing for external electronic equipment on a flight platform, where the intermediate connecting structure between the inner and outer skins is a sandwich structure. This sandwich structure includes a corrugated reinforcing layer that divides the space between the inner and outer skins into multiple filling cavities, each filled with a foam core block. After curing, adjacent layers from different parts fuse together seamlessly without a clear boundary.

[0004] For composite material box bodies where the intermediate connection structure between the inner and outer skins is a connecting rib, the connecting ribs corresponding to the sides of the box body are often vertically connected to the inner and outer skins used to form the corresponding sides of the box body. The inner skin, connecting rib, and outer skin form a T-shaped structure. The general molding process for this type of composite material box body is step-by-step molding, namely, inner skin layup → mold closing → hot pressing → mold opening → dimensional adjustment → connecting rib layup → mold closing → secondary hot pressing → mold opening → dimensional adjustment → outer skin layup → mold closing → hot pressing → mold opening → dimensional adjustment, until the designed structure is achieved.

[0005] The aforementioned step-by-step molding process inevitably involves the separation of materials and structures in different parts of the composite material box. This leads to a decrease in the overall integrity and consistency of the composite material box, especially since the connection strength between the connecting ribs and various parts may become a major factor affecting the overall strength of the composite material. In addition, the molding processes such as mold closing, mold opening, and hot pressing are repeated throughout the process, requiring a large amount of manpower, which will also reduce production efficiency and lead to higher costs. Summary of the Invention

[0006] The purpose of this invention is to provide a molding method for composite material boxes, solving the problems of low connection strength, low production efficiency, and high cost caused by the step-by-step molding process used in existing composite material boxes with connecting ribs. Another purpose of this invention is to provide a composite material box that solves the problems of low connection strength, low production efficiency, and high cost associated with existing composite material boxes with connecting ribs.

[0007] The molding method for the composite material box in this invention adopts the following technical solution:

[0008] The molding method for composite material housings includes the following steps:

[0009] Step 1: Lay out the inner skin of the inner skin on the side closest to the center of the box body;

[0010] Step 2: Lay the intermediate connecting portion on the supporting material to form a connecting rib plate perpendicular to the inner skin of the composite material box: The part of the intermediate connecting portion used to form the connecting rib plate is "U" shaped, having an inner bonding portion as part of the inner skin, an outer bonding portion as part of the outer skin, and a rib plate portion corresponding to the bottom wall of the "U" shape connecting the inner bonding portion and the outer bonding portion. The rib plate portion is used to form the connecting rib plate.

[0011] Step 3: Attach the inner side of the bonding part to the inner side of the inner skin;

[0012] Step 4: On the outer side of the outer skin of the outer layer of the outer bonding part away from the center of the box body, the outer layer of the outer skin and the outer side of the outer skin together form the outer skin.

[0013] Step 5: The inner part of the inner skin, the middle connecting part, and the outer bonding part are integrally hot-pressed into shape.

[0014] The beneficial effects of the above technical solution are that the molding method adopts a layup method that divides the inner skin and outer skin into different parts along the thickness direction. The intermediate connecting part is set as an inner bonding part, an outer bonding part, and a stiffener part. The inner bonding part can be molded together with the inner part of the inner skin with a large bonding area to form the inner skin. The outer bonding part can be molded together with the outer part of the outer skin with a large bonding area under the support of the supporting material to form the outer skin. The stiffener part can form a connecting stiffener. In this way, all parts of the composite material box can be integrally and one-time hot-pressed, thereby ensuring the integrity and connection strength between the connecting stiffener and the inner and outer skins. It can also reduce the number of mold opening and closing times and save the time occupied by the heating and cooling process during hot pressing. Compared with the step-by-step molding method in the prior art, it can ensure the connection strength, has higher efficiency, and can also save labor and time costs.

[0015] As a further defined technical solution: at least one connecting stiffener is formed by combining the bottom walls of two intermediate connecting parts in a mutually fitting manner.

[0016] The beneficial effect of the above-mentioned further defined technical solution is that the bottom walls of the two intermediate connecting parts can be attached to each other to increase the thickness of the connecting stiffener, which is conducive to further improving the connection strength.

[0017] As a further defined technical solution: the intermediate connecting part is divided into at least four places, and each intermediate connecting part is arranged in a rectangular array; the edges of two adjacent intermediate connecting parts along the row direction of the rectangular array are "U" shaped and their bottom walls are attached to each other to form an "I" shape; the edges of two adjacent intermediate connecting parts along the column direction of the rectangular array are "U" shaped and their bottom walls are attached to each other to form an "I" shape.

[0018] The beneficial effect of the above-mentioned further defined technical solution is that by adopting the above-mentioned rectangular array method, not only can the thickness of the connecting stiffeners at each location be increased, but also the connecting stiffeners in the middle connecting parts of adjacent rows and columns can be formed in a cross-sectional and cross-sectional manner, thereby better ensuring the structural strength of the connecting composite material box.

[0019] As a further defined technical solution: the inner bonding portion and the outer bonding portion have side edges corresponding to the edges of the composite material box body, and an inclined portion is connected between the side edges of the inner bonding portion and the outer bonding portion, the inclined portion forming a corner rib extending along the diagonal of the composite material box body.

[0020] The beneficial effect of the aforementioned further defined technical solution is that by setting the inclined portion, corner stiffeners can be formed on the composite material box, which can improve the structural strength at the edges of the composite material box and further enhance the overall structural strength.

[0021] As a further defined technical solution: at least one corner stiffener is composed of two inclined portions joined together.

[0022] The beneficial effect of the aforementioned further defined technical solution is that it can increase the thickness of the corner stiffeners, thereby better ensuring structural strength.

[0023] As a further defined technical solution: the inner side of the intermediate connecting part conforms to the contour of the inner side of the inner skin.

[0024] The beneficial effect of the aforementioned further defined technical solution is that it can maximize the bonding area between the inner side of the bonding part and the inner side of the inner skin, thereby ensuring the structural strength of the entire box to the greatest extent.

[0025] As a further defined technical solution: the outer side of the intermediate connecting part conforms to the outline of the outer side of the outer skin.

[0026] The beneficial effect of the aforementioned further defined technical solution is that it can maximize the bonding area between the outer side fitting part and the outer side of the outer skin, thereby ensuring the structural strength of the entire box to the greatest extent.

[0027] As a further defined technical solution: at least one side of the composite material box has an opening, the inner side of the inner skin and / or the outer side of the outer skin are provided with a folded edge that bends toward the middle connecting part on the side corresponding to the opening, and the edge part of the middle connecting part corresponding to the opening is "U" shaped, and the bottom wall of the "U" shape is attached to the folded edge during the layup.

[0028] The beneficial effect of the aforementioned further defined technical solution is that by using the "U"-shaped bottom wall to cooperate with the folded edge of the inner part of the inner skin and / or the outer part of the outer skin, the structural strength of the opening of the composite material box can be improved.

[0029] The composite material box in this invention adopts the following technical solution:

[0030] A composite material housing, formed by hot-pressing and curing a resin-impregnated plywood, includes an inner skin, an outer skin, and connecting ribs vertically connected between the inner and outer skins. The inner skin, outer skin, and connecting ribs are all formed from plywood. The plywood is characterized by including an intermediate connecting portion for forming the connecting ribs. The plywood corresponding to the portion forming the connecting ribs in the intermediate connecting portion is U-shaped, having an inner bonding portion as part of the inner skin, an outer bonding portion as part of the outer skin, and a rib portion connecting the inner and outer bonding portions. The rib portion corresponds to the bottom wall of the U-shape and is used to form the connecting ribs. The inner skin is formed by the inner portion of the inner skin near the center of the housing and the inner bonding portion, and the outer skin is formed by the outer portion of the outer skin away from the center of the housing and the outer bonding portion.

[0031] The beneficial effects of the above technical solution are that the inner and outer skins of the composite material box are divided into different parts along the thickness direction. The middle connecting part is set as an inner bonding part, an outer bonding part, and a stiffening plate part. The inner bonding part and the inner part of the inner skin can be formed together with a large bonding area to form the inner skin. The outer bonding part, supported by the supporting material, can be formed together with the outer part of the outer skin with a large bonding area to form the outer skin. The stiffening plate part can form a connecting stiffening plate. In this way, all parts of the composite material box can be formed by hot pressing in one piece, thereby ensuring the integrity and connection strength between the connecting stiffening plate and the inner and outer skins. It can also reduce the number of mold opening and closing times and save the time occupied by the heating and cooling process during hot pressing. Compared with the step-by-step molding method in the prior art, it can ensure the connection strength and has higher molding efficiency, saving labor and time costs.

[0032] As a further defined technical solution: at least one connecting stiffener is formed by combining the bottom walls of two intermediate connecting parts in a mutually fitting manner.

[0033] The beneficial effect of the above-mentioned further defined technical solution is that the bottom walls of the two intermediate connecting parts can be attached to each other to increase the thickness of the connecting stiffener, which is conducive to further improving the connection strength.

[0034] As a further defined technical solution: the intermediate connecting part corresponding to any side of the composite material box is divided into at least four places, and each intermediate connecting part is arranged in a rectangular array. The edges of two adjacent intermediate connecting parts along the row direction of the rectangular array are "U" shaped and their bottom walls are attached to each other. The edges of two adjacent intermediate connecting parts along the column direction of the rectangular array are "U" shaped and their bottom walls are attached to each other, forming an "I" shape.

[0035] The beneficial effect of the above-mentioned further defined technical solution is that by adopting the above-mentioned rectangular array method, not only can the thickness of the connecting stiffeners at each location be increased, but also the connecting stiffeners in the middle connecting parts of adjacent rows and columns can be formed in a cross-sectional and cross-sectional manner, thereby better ensuring the structural strength of the connecting composite material box.

[0036] As a further defined technical solution: the inner bonding portion and the outer bonding portion have side edges corresponding to the edges of the composite material box body, and an inclined portion is connected between the side edges of the inner bonding portion and the outer bonding portion, the inclined portion forming a corner rib extending along the diagonal of the composite material box body.

[0037] The beneficial effect of the aforementioned further defined technical solution is that by setting the inclined portion, corner stiffeners can be formed on the composite material box, which can improve the structural strength at the edges of the composite material box and further enhance the overall structural strength.

[0038] As a further defined technical solution: at least one corner stiffener is composed of two inclined portions joined together.

[0039] The beneficial effect of the aforementioned further defined technical solution is that it can increase the thickness of the corner stiffeners, thereby better ensuring structural strength.

[0040] As a further defined technical solution: the inner side of the intermediate connecting part conforms to the contour of the inner side of the inner skin.

[0041] The beneficial effect of the aforementioned further defined technical solution is that it can maximize the bonding area between the inner side of the bonding part and the inner side of the inner skin, thereby ensuring the structural strength of the entire box to the greatest extent.

[0042] As a further defined technical solution: the outer side of the intermediate connecting part conforms to the outline of the outer side of the outer skin.

[0043] The beneficial effect of the aforementioned further defined technical solution is that it can maximize the bonding area between the outer side fitting part and the outer side of the outer skin, thereby ensuring the structural strength of the entire box to the greatest extent.

[0044] As a further defined technical solution: at least one side of the composite material box has an opening, the inner side of the inner skin and / or the outer side of the outer skin are provided with a folded edge that bends toward the middle connecting part on the side corresponding to the opening, and the edge part of the middle connecting part corresponding to the opening is "U" shaped, and the bottom wall of the "U" shape is attached to the folded edge.

[0045] The beneficial effect of the aforementioned further defined technical solution is that by using the "U"-shaped bottom wall to cooperate with the folded edge of the inner part of the inner skin and / or the outer part of the outer skin, the structural strength of the opening of the composite material box can be improved. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of a composite material box in this invention;

[0047] Figure 2 yes Figure 1 A cross-sectional view;

[0048] Figure 3 yes Figure 2 A magnified view of a portion at point A;

[0049] Figure 4 yes Figure 1 The longitudinal sectional view shows that the cutting position corresponds to the hollowed-out part;

[0050] Figure 5 yes Figure 4A magnified view of a section at point B in the middle;

[0051] Figure 6 yes Figure 1 A schematic diagram of the structure of the inner part of the inner skin of the middle inner layer;

[0052] Figure 7 yes Figure 1 Exploded view of the structure of the middle connecting section;

[0053] Figure 8 yes Figure 1 A schematic diagram of the structure of the outer part of the outer skin.

[0054] The names of the components corresponding to the corresponding reference numerals in the figure are as follows: 10, inner skin; 11, inner part of inner skin; 20, outer skin; 21, outer part of outer skin; 30, folded edge; 41, connecting stiffener; 42, corner stiffener; 50, intermediate connecting part; 51, inner fitting part; 52, outer fitting part; 53, stiffener part; 54, inclined part; 60, opening. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0057] It should be noted that, in specific embodiments of the present invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the use of phrases such as "comprising a…" to define an element does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0058] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0059] In the description of this invention, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the body, or it can be separately arranged from the body and connected to the body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0060] The present invention will be further described in detail below with reference to embodiments.

[0061] Example 1 of the composite material box in this invention:

[0062] like Figure 1 , Figure 2 and Figure 4 As shown, the composite material box is a rectangular box with a square cross-section, formed by hot-pressing and curing resin-impregnated layup materials. Hot-pressing and fixing resin-impregnated layup materials into composite materials is a commonly used and known process, which will not be described in detail here. The composite material box is constructed according to... Figure 1 The view shown has four hollowed-out sides (front, back, left), and openings 60° at the top and bottom.

[0063] Structurally, the composite material box body includes an inner skin 10, an outer skin 20, and connecting stiffeners 41 vertically connecting the inner skin 10 and the outer skin 20. The inner skin 10 is composed of... Figure 6 The inner side of the inner skin 11 on the side closest to the center of the box body and Figure 7 The inner side bonding portion 51 of the intermediate connecting portion 50 shown is formed, and the inner side portion 11 of the inner skin and the inner side bonding portion 51 are stacked and formed into one piece along the thickness direction of the inner skin 10. The outer skin 20 is made of Figure 6 The outer side of the outer skin 21 on the side furthest from the center of the box body Figure 7 The outer fitting portion 52 of the intermediate connecting portion 50 shown is formed by the outer skin outer portion 21 and the outer fitting portion 52 being stacked and formed integrally along the thickness direction of the outer skin 20. The connecting stiffener 41 is made of Figure 7 The stiffener portion 53 of the intermediate connecting portion 50 shown is formed. The inner skin inner portion 11, the outer skin outer portion 21 and the intermediate connecting portion 50 in the figure are shown with outlines, mainly to facilitate understanding of the structure of the composite material box. In the actual product, the outline corresponding to this outline does not exist after hot pressing.

[0064] Specifically, such as Figure 7 The intermediate connecting portion 50 corresponding to any side of the composite material box is divided into four parts, each intermediate connecting portion 50 arranged in a rectangular array, and each dividing point of the intermediate connecting portion 50 corresponds to a connecting stiffener 41. The layup material corresponding to the part forming the connecting stiffener 41 is U-shaped, such as... Figure 3 , Figure 5 It has an inner bonding portion 51 as part of the inner skin 10, an outer bonding portion 52 as part of the outer skin 20, and the aforementioned stiffening plate portion 53. The stiffening plate portion 53 connects the inner bonding portion 51 and the outer bonding portion 52, corresponds to the "U"-shaped bottom wall, and is used to form a connecting stiffening plate 41.

[0065] like Figure 3 Along the row direction of the rectangular array, the edges of two adjacent intermediate connecting portions 50 are U-shaped and their bottom walls are fitted together. Similarly, along the column direction of the rectangular array, the edges of two adjacent intermediate connecting portions 50 are U-shaped and their bottom walls are fitted together, forming an "I"-shaped structure at the connecting ribs 41 on the composite material box. Corresponding to the hollow structure on the side of the composite material box, the four intermediate connecting portions 50 are all hollow frame structures. The inner fitting portion 51 of the intermediate connecting portion 50 matches the contour of the inner skin inner portion 11, and the outer fitting portion 52 of the intermediate connecting portion 50 matches the contour of the outer skin outer portion 21. The hollow frame structure is filled with foam material as a support material. When laying up the intermediate connecting portions 50, the support material can be used to shape the intermediate connecting portions 50 into a specific shape.

[0066] like Figure 5 , Figure 6 , Figure 8 As shown, the inner side portion 11 of the inner skin has an outwardly bent edge 30 on the side corresponding to the opening 60, and the outer side portion 21 of the outer skin has an inwardly bent edge 30 on the side corresponding to the opening 60. The edge portion of the middle connecting portion 50 corresponding to the opening 60 is also "U"-shaped. The bottom wall of the "U" shape is attached to the outwardly bent edge 30 on the inner side portion 11 of the inner skin, and the outwardly bent edge 30 on the inner side portion 11 of the inner skin is attached to the inwardly bent edge 30 on the outer side portion 21 of the outer skin, which can ensure the structural stability of the composite material box opening 60.

[0067] like Figure 3 The intersection of the front, back, left and right sides of the composite material box forms four edges. The inner bonding part 51 and the outer bonding part 52 both have sides corresponding to the edges of the composite material box. An inclined part 54 connects the sides of the inner bonding part 51 and the outer bonding part 52. The inclined part 54 forms a corner rib 42 extending along the diagonal of the composite material box. Each corner rib 42 is composed of two inclined parts 54 combined in a mutually bonding manner, which can ensure the structural strength at the edges of the composite material box.

[0068] The composite material box body of the present invention adopts the above-described structure. The intermediate connecting part 50 is configured as an inner bonding part 51, an outer bonding part 52, and a stiffening plate part 53. The stiffening plate part 53 can form a reliable connection with the inner bonding part 51 and the outer bonding part 52 through a layered structure. The inner bonding part 51 and the outer bonding part 52 ultimately serve as part of the inner skin 10 and the outer skin 20, respectively, and can be firmly bonded to the inner part 11 of the inner skin and the outer part 21 of the outer skin with a large area, thereby achieving integral hot pressing molding and ensuring that each part has high connection strength.

[0069] The molding method of the above-mentioned composite material box is as follows, which is also Example 1 of the molding method of the composite material box in this invention:

[0070] Step 1: Lay an inner skin 10 on the outer side of the inner mold body of the corresponding hot pressing mold, and lay the inner skin 11 on the inner side of the side of the inner skin near the center of the box body;

[0071] Step 2: Foam material is used as the supporting material, and the intermediate connecting portion 50 is laid out to form a connecting rib 41 perpendicular to the inner skin 10 of the composite material box. The intermediate connecting portion 50 is divided into at least four locations, each arranged in a rectangular array, with each intermediate connecting portion 50 corresponding to a piece of supporting material. On each side of the composite material box, adjacent intermediate connecting portions 50 along the row direction of the rectangular array have "U"-shaped edges and their bottom walls are mutually abutting. Similarly, adjacent intermediate connecting portions 50 along the column direction of the rectangular array also have "U"-shaped edges and their bottom walls are mutually abutting. The supporting material is foamed material. To ensure the hot-pressing pressure and the thickness after molding, the overall thickness of the supporting material, including the inner skin inner portion 11 and the inner abutment portion 51, is greater than the set wall thickness of the box, avoiding insufficient wall thickness of the composite material box after hot pressing.

[0072] Each intermediate connecting portion 50 is U-shaped in the part that forms the connecting stiffener 41. It has an inner bonding portion 51 as part of the inner skin 10, an outer bonding portion 52 as part of the outer skin 20, and a stiffener portion 53 corresponding to the bottom wall of the U-shape connecting the inner bonding portion 51 and the outer bonding portion 52. The stiffener portion 53 forms the connecting stiffener 41. When the intermediate connecting portion 50 is laid, a supporting material is provided between the inner bonding portion 51 and the outer bonding portion 52. The connecting stiffener 41 at the splice of the four intermediate connecting portions 50 is formed by combining the bottom walls of the two intermediate connecting portions 50 in a mutually bonding manner.

[0073] The inner bonding portion 51 and the outer bonding portion 52 have side edges corresponding to the edges of the composite material box. An inclined portion 54 is connected between the side edges of the inner bonding portion 51 and the outer bonding portion 52. The inclined portion 54 forms a corner rib 42 extending along the diagonal of the composite material box. Each corner rib 42 is formed by combining two inclined portions 54 in a mutually bonding manner.

[0074] Meanwhile, the inner side fitting portion 51 of the intermediate connecting portion 50 matches the outline of the inner side portion 11 of the inner skin, and the outer side fitting portion 52 of the intermediate connecting portion 50 also matches the outline of the outer side portion 21 of the outer skin.

[0075] In addition, the inner side portion 11 of the inner skin has an outwardly bent edge 30 on the side corresponding to the opening 60, and the outer side portion 21 of the outer skin has an inwardly bent edge 30 on the side corresponding to the opening 60. The edge portion of the middle connecting portion 50 corresponding to the opening 60 is also "U"-shaped. The bottom wall of the "U" shape is attached to the outwardly bent edge 30 on the inner side portion 11 of the inner skin, and the outwardly bent edge 30 on the inner side portion 11 of the inner skin is attached to the inwardly bent edge 30 on the outer side portion 21 of the outer skin.

[0076] Step 3: Adhere the inner side bonding portion 51 to the inner side portion 11 of the inner skin;

[0077] Step 4: On the side of the outer layer of the outer skin 20 away from the center of the box body, the outer layer of the outer skin 20 and the outer skin portion 21 together form the outer skin 20.

[0078] Step 5: The inner part 11, the middle connecting part 50, and the outer bonding part 52 of the inner skin are integrally hot-pressed and formed.

[0079] Example 2 of the composite material box in this invention:

[0080] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the connecting stiffener 41 of the composite material box is formed by two "U"-shaped bottom walls being bonded together. In this embodiment, the connecting stiffener 41 of the composite material box is formed by only one "U"-shaped bottom wall.

[0081] Correspondingly, in Example 2 of the molding method for composite material box, the connecting rib plate 41 of the composite material box is formed by relying on only one "U"-shaped bottom wall in the intermediate connection part 50 of the layup.

[0082] Example 3 of the composite material box in this invention:

[0083] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the inner side portion 11 of the inner skin and the outer side portion 21 of the outer skin have folded edges 30 that bend towards the intermediate connecting portion 50 on the sides corresponding to the opening 60 of the composite material box, which fit against the bottom wall of the "U"-shaped structure of the edge portion of the intermediate connecting portion 50 to form the side wall end face of the composite material box. In this embodiment, the side wall end face of the composite material box is entirely formed by the bottom wall of the "U"-shaped structure of the edge portion of the intermediate connecting portion 50.

[0084] Correspondingly, in Example 3, which is a method for molding composite material boxes, the side wall end face of the composite material box is formed by relying on only one "U"-shaped bottom wall when the intermediate connection part 50 of the layup is connected.

[0085] Example 4 of the composite material box in this invention:

[0086] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the supporting material between the inner bonding portion 51 and the outer bonding portion 52 of the intermediate connecting portion 50 is retained inside the composite material box during hot pressing. In this embodiment, the supporting material is removed after the composite material box is hot-pressed, and there is no supporting material.

[0087] Correspondingly, in Example 4, which is a method for forming a composite material box, the hot pressing process also includes a step of removing the support material, which can be done by milling, grinding, cutting, or other methods.

[0088] Example 5 of the composite material box in this invention:

[0089] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the inner fitting portion 51 of the intermediate connecting portion 50 matches the contour of the inner skin inner portion 11, and the outer fitting portion 52 matches the contour of the outer skin outer portion 21. In this embodiment, the inner fitting portion 51 and the outer fitting portion 52 of the intermediate connecting portion 50 can also be fitted to portions of the inner skin inner portion 11 and the outer skin outer portion 21, respectively.

[0090] Correspondingly, in Example 5, which is a method for molding a composite material box, when the intermediate connection portion 50 is laid up, the inner bonding portion 51 and the outer bonding portion 52 are bonded to a portion of the inner skin inner portion 11 and the outer skin outer portion 21, respectively.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A method for molding a composite material box, characterized in that, Includes the following steps: Step 1: Lay out the inner skin (10) on the inner side of the inner skin (11) near the center of the box body. Step 2: Lay out intermediate connecting parts (50) on the supporting material. The intermediate connecting parts (50) corresponding to any side of the composite material box are divided into at least four places. Each intermediate connecting part (50) is arranged in a rectangular array. Each boundary of the intermediate connecting parts (50) corresponds to a connecting rib (41). The lay-up material corresponding to the part used to form the connecting rib (41) is "U" shaped. Each intermediate connecting part (50) is a hollow frame structure. The hollow frame structure includes an inner bonding part (51) as part of the inner skin (10) and an outer skin (20) as part of the outer skin (20). The side-fitting portion (52) and the stiffening plate portion (53) corresponding to the bottom wall of the U-shape connected between the inner side-fitting portion (51) and the outer side-fitting portion (52) form an I-shaped structure by fitting the bottom walls of two adjacent hollow frame structures along the row or column direction of the rectangular array. The inner side-fitting portion (51) and the outer side-fitting portion (52) have side edges corresponding to the edges of the composite material box. An inclined portion (54) is connected between the side edges of the inner side-fitting portion (51) and the outer side-fitting portion (52). The inclined portion (54) forms a corner stiffening plate (42) extending along the diagonal of the composite material box. Step 3: The inner side bonding part (51) is bonded to the inner side part (11) of the inner skin to form the inner skin (10). Step 4: The outer part (21) of the outer skin is attached to the outer bonding part (52) to form the outer skin (20). Step 5: The inner part (11), the middle connecting part (50) and the outer bonding part (52) of the inner skin are integrally hot-pressed and formed.

2. The molding method for the composite material box body according to claim 1, characterized in that, The supporting material is made of foamed material. The overall thickness of the supporting material, including the inner skin inner part (11) and the inner bonding part (51), is greater than the set wall thickness of the box body to avoid insufficient wall thickness of the composite material box body after hot pressing.

3. The molding method for the composite material box body according to claim 1 or 2, characterized in that, The inner side of the connecting part (50) fits the contour of the inner side of the inner skin (11).

4. The molding method for the composite material box body according to claim 1 or 2, characterized in that, The outer fitting portion (52) of the intermediate connecting portion (50) matches the outline of the outer skin outer portion (21).

5. The molding method for the composite material box body according to claim 1 or 2, characterized in that, At least one side of the composite material box has an opening (60), and the inner side portion (11) of the inner skin and / or the outer side portion (21) of the outer skin are provided with a folded edge (30) that bends toward the intermediate connecting portion (50) on the side corresponding to the opening (60). The edge portion of the intermediate connecting portion (50) corresponding to the opening (60) is "U" shaped, and the bottom wall of the "U" shape is attached to the folded edge (30) during the layup.

6. A composite material housing, formed by hot pressing and curing of a resin-impregnated plywood, comprising an inner skin (10), an outer skin (20), and a connecting rib (41) vertically connected between the inner skin (10) and the outer skin (20), wherein the inner skin (10), the outer skin (20), and the connecting rib (41) are all formed of plywood, characterized in that, The ply material includes intermediate connecting portions (50) for forming connecting stiffeners (41). The intermediate connecting portions (50) corresponding to any side of the composite material box are divided into at least four locations. Each intermediate connecting portion (50) is arranged in a rectangular array. Each boundary of the intermediate connecting portion (50) corresponds to a connecting stiffener (41). The ply material corresponding to the location for forming the connecting stiffener (41) is "U" shaped. Each intermediate connecting portion (50) is a hollow frame structure. The hollow frame structure includes an inner bonding portion (51) as part of the inner skin (10), an outer bonding portion (52) as part of the outer skin (20), and a connection between the inner bonding portion (51) and the outer bonding portion. (52) The stiffening plate portion (53) corresponding to the bottom wall of the U-shape between the two hollow frame structures are attached to form an I-shaped structure along the row or column direction of the rectangular array. The inner attachment portion (51) and the outer attachment portion (52) have side edges corresponding to the edges of the composite material box. An inclined portion (54) is connected between the side edges of the inner attachment portion (51) and the outer attachment portion (52). The inclined portion (54) forms a corner stiffening plate (42) extending along the diagonal of the composite material box. The inner skin (10) is formed by the inner side portion (11) of the inner skin and the inner attachment portion (51). The outer skin (20) is formed by the outer side portion (21) of the outer skin and the outer attachment portion (52).

7. The composite material housing according to claim 6, characterized in that, The hollow frame structure is filled with a support material, which is a foam material. The overall thickness of the support material, the inner skin inner part (11) and the inner bonding part (51) is greater than the set wall thickness of the box, so as to avoid insufficient wall thickness of the composite material box after hot pressing.

8. The composite material housing according to claim 6 or 7, characterized in that, The inner side of the connecting part (50) fits the contour of the inner side of the inner skin (11).

9. The composite material housing according to claim 6 or 7, characterized in that, The outer fitting portion (52) of the intermediate connecting portion (50) matches the outline of the outer skin outer portion (21).

10. The composite material housing according to claim 6 or 7, characterized in that, At least one side of the composite material box has an opening (60), and the inner side portion (11) of the inner skin and / or the outer side portion (21) of the outer skin are provided with a folded edge (30) that bends toward the intermediate connecting portion (50) on the side corresponding to the opening (60). The edge portion of the intermediate connecting portion (50) corresponding to the opening (60) is "U" shaped, and the bottom wall of the "U" shape is attached to the folded edge (30).

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