A method for improving the firmness of a pre-embedded nut block

Abstract

The application discloses a kind of improve the laying method of embedded nut package block firmness, comprising the following steps: each layer large surface is provided with the reserved hole for embedded nut, and the multiple layer large surface is sequentially stacked with the reserved hole as center focus, and the interlayer gap is set between each layer large surface after sequentially stacked;Prepreg roll is placed at the bottom of reserved hole, and embedded nut is fixedly arranged in the center of prepreg roll by positioning pin;The patch is folded to form a bent shape, one end of the patch is inserted into the interlayer gap between adjacent large surfaces through the reserved hole to complete the three-dimensional insertion, and the other end of the patch is inserted and bonded with the prepreg roll to locally reinforce the prepreg roll.The application improves the connection effect between prepreg and laying, between convex hull and laying, not only can improve the positioning mode during laying process, improve the positioning effect, prevent the laying structure from deviating during product transfer, but also improve the firmness of finished product.

Description

Technical Field

[0001] This invention relates to the field of layup technology, and more specifically to a layup method for improving the firmness of pre-embedded nut blocks. Background Technology

[0002] In thermosetting composite integral molding products, in order to ensure assembly reliability and save labor costs, a molding process for integral molding of pre-embedded nuts has been developed. The difficulty in the molding process is how to fix the pre-embedded nuts to the layup.

[0003] The existing technology for integrally forming pre-embedded nuts includes the following three steps:

[0004] Step 1: Drill a hole on the surface directly opposite the pre-embedded nut. The size of the hole should match the outer diameter of the pre-embedded nut.

[0005] The second step involves aligning the holes after multiple layers of paving.

[0006] The third step involves rolling the same resin-based chopped fiber reinforced prepreg into a cylindrical shape and placing it in the center of the opening. The residual warmth of your hand is used to slightly bond the flat sheet to the prepreg cylinder, ensuring it doesn't fall off during transport. The embedded nut will then be encased in the prepreg (a raised bulge structure) to secure it.

[0007] In the above-mentioned layup scheme, the fixing effect of the embedded nut is provided by the prepreg, and the connection between the short fiber prepreg column and the large surface of the product is completed by resin curing, which is an adhesive bonding method. It can be seen that in the local bulge of the embedded nut part prepared by the existing layup scheme, only random short fibers are used for reinforcement. In terms of lateral tensile and compressive properties, it can meet the assembly requirements of the embedded nut. However, under severe vibration conditions, the bulge is more likely to fall off in the stress concentration part of the layup structure and in the hammer impact damage, or the bulge and the large surface area will crack.

[0008] The current solution to these problems is to increase the contact area between the composite material protrusion where the embedded nut is located and the large surface. However, this will cause the following problems: First, increasing the contact area will cause short-cut fibers to migrate during molding, resulting in local whitening of the finished product. Also, an excessively large protrusion may cause assembly interference. Second, during layup, positioning is only achieved through the round holes on the large surface, without a physical positioning method. The layup structure is prone to falling off or shifting during transportation. Furthermore, increasing the contact area can only improve the lateral force. However, when the longitudinal force is large, it will still cause detachment. In this case, a patch is often added to connect the area. The subsequent patch structure not only affects the temperature of assembly interference and positioning accuracy, but also affects the heating of the internal prepreg during subsequent heating and pressure curing, which may lead to uneven or insufficient heating and affect the curing effect. Summary of the Invention

[0009] The purpose of this invention is to provide a layup method that improves the firmness of the pre-embedded nut block, so as to solve the technical problems in the prior art where it is difficult to improve the connection effect between the convex bulge and the layup, and the layup structure is prone to displacement or detachment.

[0010] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0011] This invention provides a layup method for improving the firmness of pre-embedded nut blocks, comprising the following steps:

[0012] S100. Each large surface has reserved holes for pre-embedded nuts, and the multiple large surfaces are stacked sequentially with the reserved holes as the center. After being stacked sequentially, there is a layer gap between each large surface.

[0013] S200. Place the prepreg roll at the bottom of the reserved hole, and fix the pre-embedded nut at the center of the prepreg roll by the positioning pin;

[0014] S300, the patch is bent into a folded shape, one end of the patch is passed through the reserved hole and extended into the interlayer gap between adjacent large surfaces to complete the three-dimensional interlocking, and the other end of the patch is interlocked and bonded to the prepreg roll to locally reinforce the prepreg roll.

[0015] The prepreg roll is connected to the large-area reinforcement through a dual connection method of locally continuous reinforcing fibers and three-dimensional interlaced patches.

[0016] Furthermore, in S200, the preparation steps for the prepreg roll are as follows:

[0017] The prepreg roll is obtained by forming a spiral structure.

[0018] The cross-section of the vortex structure is shaped like a planar vortex spring.

[0019] Furthermore, in S300, the specific method for stereoscopic interlacing of patches is as follows:

[0020] S301. Fold the patch into a horizontal connecting area and a vertical fixing area, wherein the horizontal connecting area and the vertical fixing area are an integrated structure;

[0021] S302. Insert the horizontal connecting area into the interlayer gap, and insert the vertical fixing area into the volute of the volute structure;

[0022] Among them, several horizontal connecting areas inserted into different layer gaps form a first three-dimensional insertion structure; several vertical fixing areas inserted into different volutes form a second three-dimensional insertion structure.

[0023] Furthermore, in S302, inserting the vertical fixing area into the scroll ring of the scroll structure specifically includes the following steps:

[0024] In the vortex structure, several vertical layers to be laid are set sequentially from the inside to the outside of the vortex ring. The vertical layers to be laid are vertically set in the vortex structure. The vertical fixing area passes through the vertical layers to be laid. The position of the vertical fixing area corresponds one-to-one with the vertical layers to be laid.

[0025] S3022. Several transverse layers to be laid are provided on the interlayer gap, which are horizontal to the interlayer gap. The transverse layers to be laid are located on the periphery of the reserved hole, and the folded horizontal connecting area is extended to the transverse layers to be laid.

[0026] Furthermore, when the vertical fixing area is correspondingly set on the vertical layer to be laid, the vertical fixing area is bent into an arc shape so that the vertical fixing area provides lateral support for the vortex structure.

[0027] Furthermore, extending the folded horizontal connecting area to the lateral layer to be laid specifically includes the following steps:

[0028] Centered on the inner ring of the vortex structure, the horizontal connecting area set in the innermost layer of the vortex structure is inserted into the transverse layer to be laid, which is farthest from the vortex structure.

[0029] The horizontal connecting area set in the innermost layer of the vortex structure is inserted into the lateral layer to be laid, which is located at the second farthest point from the vortex structure.

[0030] Perform the insertion action sequentially from the inside out or from the outside in until the patch insertion is completed.

[0031] Furthermore, the prepreg roll and the large-area prepreg are made of the same resin base material;

[0032] The patch is a continuously woven fiber prepreg, and the patch and the large-area prepreg are made of the same resin base.

[0033] Furthermore, after connecting and reinforcing the prepreg rolls with patches and locally reinforcing the rolls, the overall structure is heated and pressurized to complete the solidification, wherein the heating includes external heating and internal heating;

[0034] External heating specifically refers to heating the overall structure through an external heat source;

[0035] Internal heating specifically involves setting up a heat source inside the overall structure for heating.

[0036] Furthermore, the specific method of internal heating is as follows:

[0037] The patch has a sandwich structure, and multiple channels are provided within the sandwich structure of the patch, wherein the channels are evenly distributed on the patch;

[0038] Before the patch is inserted in three dimensions, heating elements are set according to the channel distribution in the patch. The heating elements are all strip-shaped or wire-shaped structures, and the connecting ends of the heating elements are all external and movable. The connecting ends are installed after the patch is inserted in three dimensions.

[0039] After the patch is inserted in three dimensions, a heat source is connected for heating. After heating, the heat-generating component is extracted and pressurized.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] This invention uses fiber sheets for reinforcement and three-dimensional interlacing, so that the local convex blocks of the pre-embedded nut are vertically connected to the main surface through continuous fibers, which simultaneously enhances the tensile and bending strength of the horizontal and vertical connections. At the same time, the main surface is connected layer by layer, which makes it easy to position the prepreg on several holes on the main surface. The three-dimensional interlacing of the patches during the layer connection results in a good fixing effect between the cured convex and the layup. For multi-layer three-dimensional interlaced patches, the structure of the patches is improved so that they can be heated and pressure cured after the layup is completed. Attached Figure Description

[0042] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0043] Figure 1 A flowchart of a layup method for improving the firmness of pre-embedded nut blocks is provided for this invention;

[0044] Figure 2 This invention provides an isometric side view of the product layup state in Embodiment 1 (gray areas represent large surfaces, yellow and pink areas represent patches, and green areas represent prepreg rolls);

[0045] Figure 3 Provided for the present invention Figure 2 Top view of the product layup state in the embodiment shown;

[0046] Figure 4 Provided for the present invention Figure 2 Partial view of the pre-embedded nut in the illustrated embodiment;

[0047] Figure 5 Provided for the present invention Figure 2A schematic diagram of the patch structure in the illustrated embodiment.

[0048] The labels in the diagram represent the following:

[0049] 1-Large surface; 2-Embedded nut; 3-Patch; 4-Prepreg roll; 5-Horizontal connection area; 6-Vertical fixing area. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] like Figure 1 As shown, the present invention provides a layup method for improving the firmness of pre-embedded nut blocks, comprising the following steps:

[0052] Several layers are provided with reserved holes for setting pre-embedded nuts. The diameter of the reserved holes is slightly larger than the outer diameter of the pre-embedded nuts. A larger thickening area with a thickness of 0.3mm-0.6mm is designed on the other side of the convex bulge.

[0053] The multiple large surfaces are then stacked sequentially with the pre-reserved holes as the center, and a gap is set between each large surface after the sequential stacking.

[0054] The prepreg roll is placed at the bottom of the reserved hole, and the pre-embedded nut can be fixed in the center of the prepreg roll by the positioning pin;

[0055] The patch is bent into a folded shape, one end of the patch is passed through the reserved hole and extended into the interlayer gap between adjacent large surfaces to complete the three-dimensional interlocking, and the other end of the patch is interlocked and bonded to the prepreg roll to locally reinforce the prepreg roll.

[0056] After insertion, the patch can be laid on the large surface in the following way: large surface + patch + large surface; the other end of the patch extends into the prepreg roll for interlocking and bonding, and reinforces the prepreg roll.

[0057] After hot-pressing several large layers into a ply, the prepreg roll is connected to the ply by patches. At this time, the patches are interspersed three-dimensionally on the prepreg roll to facilitate support for the prepreg roll and prevent it from falling off.

[0058] After hot-pressing the prepreg roll with the ply, the prepreg roll wraps around the patch and embedded nut to form a convex shape. The convex shape is connected to the large-area reinforcement through locally continuous reinforcing fibers and three-dimensionally interwoven patches. That is, during subsequent hot pressing, the prepreg roll wraps around the embedded nut and patch to form a convex shape. The convex shape and the ply have both lateral fiber connections and vertical patch fixation, so that the embedded nut and the ply have connections and interwoven relationships in addition to fiber connections.

[0059] In this invention, patch connection replaces the adhesive bonding and short-cut reinforcement fiber connection between prepreg roll and layup in the prior art. This invention uses fiber sheet reinforcement to connect the layup composed of large surfaces to the prepreg roll through vertical three-dimensional interlaced layup. In the local bulge of the subsequent embedded nut part, not only are there random short fibers for reinforcement, but the tensile and compressive properties can meet the assembly requirements of the embedded nut. At the same time, the reinforcement fibers and interlaced connection through patch can further improve the connection effect, so that it is not easy to fall off or crack from the large surface part under severe vibration conditions, stress concentration parts and hammer damage.

[0060] Meanwhile, the present invention uses patch connections to position the prepreg roll on the large surface during the layup process, which facilitates the positioning of the pre-embedded nut protrusion column in the subsequent layup, replacing manual visual positioning and avoiding the problem of the rolled column scattering or displacement that may occur during the subsequent layup process, thereby improving the quality of the finished product.

[0061] In order to improve the bonding effect between the patch and the prepreg roll, the present invention also includes the following steps:

[0062] The prepreg roll is made into a spiral structure to obtain the prepreg roll;

[0063] The cross-section of the vortex structure is shaped like a planar vortex spring.

[0064] During the overlapping process, the patch and the chopped fiber prepreg roll are initially interwoven and bonded together. Specifically, there are several patches, and the patches are spread outward from the inside to the outside of the prepreg roll. The patches fix and support the prepreg roll into a spiral structure.

[0065] When the patch and the chopped fiber prepreg roll are connected, they also interweave. The patch can reinforce the chopped fiber prepreg roll, thereby ensuring the connection effect between the local bulge block of the embedded nut and the large surface layer.

[0066] Secondly, compared to the existing method of fixing the ends of the prepreg roll by gluing and then fixing it by chopped fibers after hot pressing, the interlocking connection adopted in this invention can not only improve the fixation between the bulge block and the layup in the subsequent process, but also prevent the prepreg roll from falling off the layup or patch when transferring the layup and the prepreg roll, thus improving the firmness of the prepreg roll during the transfer process.

[0067] Several patches can be set, and the principle of setting them is that the patches on the spiral structure can correspond to the patches on the interlayer gaps of the large surface.

[0068] As can be seen from the figures provided in this invention, when the patches arranged in the same circle of the vortex structure are a pair, each pair of patches is arranged between two adjacent large surfaces.

[0069] Furthermore, several vertical layers to be laid are arranged vertically from the inside to the outside of the vortex ring of the vortex structure;

[0070] During the layering process, the patch is passed through the vertical layer to be laid, with the position of the patch corresponding to the vertical layer to be laid one by one.

[0071] Several pairs of patches are distributed and interwoven in the interlayer gaps of different large surfaces. Corresponding to the interlayer interweaving, the patches within the volute structure are also interwoven in a three-dimensional manner. The patches in these two interweaving states further improve the connection between the volute structure and the large surfaces, and also improve the connection between the subsequent convex hull and the layup. The volute structure is difficult to detach from the large surface, and the convex hull is also difficult to detach from the layup. This solves the mechanical property defects caused by hot-press bonding of chopped fiber reinforcement material and continuous woven reinforcement fiber part on the large surface.

[0072] At the same time, due to the significantly improved connection effect, the size of the convex bulge can be appropriately reduced during product design, thereby reducing the total amount of prepreg roll raw materials used to a certain extent, thus providing more safety distance for assembling the hands.

[0073] The present invention also includes the following steps:

[0074] Several transverse layers to be laid are set horizontally to the interlayer gaps, and the transverse layers to be laid are set around the pre-reserved holes.

[0075] During the layup process, the patch that will pass through the vertical layer to be laid will be extended to the horizontal layer to be laid.

[0076] The insertion sequence of the patch is as follows:

[0077] With the inner ring of the vortex structure as the center, the patch located in the innermost vertical layer of the vortex structure is inserted into the horizontal layer located farthest from the vortex structure.

[0078] Insert the patch of the vertical layer to be laid in the innermost layer of the vortex structure into the horizontal layer to be laid in the farthest layer from the vortex structure.

[0079] Insert the patch located in the vertical layer of the innermost layer of the vortex structure into the horizontal layer located farthest from the innermost layer of the vortex structure.

[0080] Perform the insertion action sequentially from the inside out or from the outside in until the patch insertion is completed.

[0081] from Figure 5 It can be clearly seen that the same patch can be divided into a horizontal connecting area 5 and a vertical fixing area 6. The horizontal connecting area 5 and the vertical fixing area 6 are an integrated structure. During the layup, the horizontal connecting area 5 is set on the horizontal layer to be laid, and the vertical fixing area 6 is set on the vertical layer to be laid.

[0082] Since the prepreg roll in this invention has a spiral structure, it is difficult to support the spiral structure in actual operation. Therefore, in this embodiment, the vertical fixing area 6 on the same interlayer gap is located in the same ring of the spiral structure. After the vertical fixing area 6 is fixed by the horizontal connecting area 5, the vertical fixing area 6 can fit on the same ring of the spiral structure and maintain its spiral structure.

[0083] To further support the prepreg roll, the present invention also includes the following steps:

[0084] When the vertical fixing area 6 is set on the vertical layer to be laid, the vertical fixing area 6 is bent into an arc shape so that the vertical fixing area 6 provides lateral support to the vortex structure.

[0085] Furthermore, as shown in the figure of this invention, the vertical fixing area 6 is curved within the vortex structure, and the vertical fixing areas 6 with the same layer spacing are connected end to end to form a single-layer elliptical structure. The illustrated patch vertical fixing areas 6 are arranged in a single loop, but the number of patches and the shape of the patches can be increased and modified as needed.

[0086] In this pre-embedded nut block layup process, the overall material cost and mechanical properties can be adjusted by using different types of fiber reinforcement materials, and pre-embedded nuts of different sizes and shapes can be selected to meet assembly requirements.

[0087] Preferably, the prepreg roll and the prepreg are made of the same resin base material.

[0088] The patch is made of continuous woven fiber prepreg, and the resin base is made of the same material as the prepreg of the main surface. This invention can change the connection between the main surface and the convex pack to a fiber + resin state by using a continuous fiber prepreg patch, thereby improving the fixing effect.

[0089] The shape of the patch is related to the shape of the thickened area and the height of the bump. The number of patch layers should be controlled between 2 and 4. The shape should be as complete as possible to avoid overly thin patch designs, ensuring the strength of fiber connection and controlling the size of the bump as much as possible.

[0090] In addition, after connecting and reinforcing the prepreg rolls with patches and locally reinforcing the rolls, the overall structure is heated and pressurized to complete the solidification. The heating includes external heating and internal heating.

[0091] External heating specifically refers to heating the overall structure through an external heat source;

[0092] Internal heating specifically involves placing a heat source inside the overall structure for heating, and the specific method is as follows:

[0093] The patch has a sandwich structure, and multiple channels are provided within the sandwich structure of the patch, wherein the channels are evenly distributed on the patch;

[0094] Before the patch is inserted in three dimensions, heating elements are set according to the channel distribution in the patch. The heating elements are all strip-shaped or wire-shaped structures, and the connecting ends of the heating elements are all external and movable. The connecting ends are installed after the patch is inserted in three dimensions.

[0095] After the patch is inserted in three dimensions, a heat source is connected for heating. After heating, the heat-generating component is extracted and pressurized.

[0096] In this method, for multi-layered three-dimensional interlocking patches, the heating of the inner layer prepreg is increased by heating from the inside to prevent uneven or insufficient heating from affecting curing.

[0097] The following provides specific examples for illustration.

[0098] Example 1:

[0099] 1. Material selection:

[0100] Three-layer large surface 1 (in) Figure 2 The middle is gray), two pairs of patches 3 (in Figure 2 (in yellow and pink), prepreg roll 4 (in) Figure 2 (Green), 2 pre-embedded nuts;

[0101] Patch 3 is a continuously woven fiber prepreg, and the resin base used is the same material as that used in the main prepreg.

[0102] 2. Opening

[0103] Each large surface has reserved holes for pre-embedded nuts. The large surface 1 layer is suspended and stacked into a double large surface layer (the gray plane is a schematic diagram of the large surface 1 layer of the product). The multiple large surfaces are stacked sequentially with the reserved holes as the center. After being stacked sequentially, there is a layer gap between each large surface layer.

[0104] (The diameter of the pre-drilled hole on the large surface 1 can be appropriately enlarged to make it slightly larger than the outer diameter of the pre-embedded nut 2);

[0105] A larger thicker area with a thickness of 0.3mm-0.6mm is designed on the opposite side of the convex hull;

[0106] 3. Overlap

[0107] The prepreg roll is made into a spiral structure to obtain prepreg roll 4. The prepreg roll 4 is placed at the bottom of the large surface layer, and the patch is bent to form a folded shape.

[0108] The two first patches ( Figure 2 The horizontal connecting area 5 (shown in yellow) is set on the highest horizontal layer to be laid, and the vertical fixing areas 6 of the two first patches are curved into an arc and are set on the innermost vertical layer to be laid.

[0109] Two second patches ( Figure 2 The horizontal connecting area 5 (displayed in pink) is set on the horizontal layer to be laid in the second highest position, and the vertical fixing area 6 of the two first patches is curved into an arc and is set on the vertical layer to be laid in the second inner ring.

[0110] After the patch is inserted in three dimensions, a heat source is connected for heating. After heating, the heat-generating component is extracted and pressurized.

[0111] 4. Hot pressing

[0112] Press the large surfaces 1 together, and fix the upper ends of the patches 3 inside the large surfaces 1. At this time, the prepreg roll 4 and the layup are initially fixed.

[0113] The lower ends of the embedded nut 2 and the patch 3 are pressed into the prepreg roll 4. The patch 3 and the embedded nut 2 cover the prepreg roll 4 to form a convex bulge. At this time, the prepreg roll 4 is further fixed to the layup.

[0114] It is worth noting that when designing the mold, attention should be paid to processing according to the state of the product blank, and thickening areas should be avoided.

[0115] This invention uses fiber sheets to reinforce the connection between the layup and the raised package, and three-dimensionally interweaves the prepreg and layup, which has the following beneficial effects:

[0116] ① This strengthens the connection between the local protrusions of the embedded nut and the large-area reinforcing fiber, and increases the interlocking connection, thereby improving the overall strength of the finished product;

[0117] ② The size of the protrusion of the pre-embedded nut can be appropriately reduced to provide more safety distance for assembling the hands;

[0118] ③ When positioning the layers, the pads can be used to extend the material sheet downwards to avoid the short fiber prepreg rolls from being misaligned, which would result in poor appearance of the finished product.

[0119] ④ The patch sheet can be initially interlocked and bonded to the chopped fiber prepreg roll to increase the stability of the preformed part before curing and ensure that the chopped fiber prepreg roll does not fall off.

[0120] The layup method for improving the firmness of the pre-embedded nut block in this embodiment can improve the connection effect between the prepreg and the layup, and between the bulge and the layup. It can not only improve the positioning method and position effect during the layup process, and prevent the layup structure from shifting during product transportation, but also improve the firmness of the finished product.

[0121] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A layering method for improving the firmness of pre-embedded nut blocks, characterized in that, The steps include the following: S100. Each large surface has reserved holes for pre-embedded nuts, and the multiple large surfaces are stacked sequentially with the reserved holes as the center. After being stacked sequentially, there is a layer gap between each large surface. S200. Place the prepreg roll at the bottom of the reserved hole, and fix the pre-embedded nut at the center of the prepreg roll by the positioning pin; S300, the patch is bent into a folded shape, one end of the patch is passed through the reserved hole and extended into the interlayer gap between adjacent large surfaces to complete the three-dimensional interlocking, and the other end of the patch is interlocked and bonded to the prepreg roll to locally reinforce the prepreg roll. The prepreg roll is connected to the large-area reinforcement through a dual connection method of locally continuous reinforcing fibers and three-dimensional interlaced patches.

2. The method for improving the firmness of embedded nut blocks according to claim 1, characterized in that, In S200, the preparation steps for the prepreg roll are as follows: The prepreg roll is obtained by forming a spiral structure. The cross-section of the vortex structure is shaped like a planar vortex spring.

3. The layering method for improving the firmness of the embedded nut block according to claim 2, characterized in that, In S300, the specific method for stereoscopic interlacing of patches is as follows: S301. Fold the patch into a horizontal connecting area and a vertical fixing area, wherein the horizontal connecting area and the vertical fixing area are an integrated structure; S302. Insert the horizontal connecting area into the interlayer gap, and insert the vertical fixing area into the volute of the volute structure; Among them, several horizontal connecting areas inserted into different layer gaps form a first three-dimensional insertion structure; several vertical fixing areas inserted into different volutes form a second three-dimensional insertion structure.

4. The layering method for improving the firmness of the embedded nut block according to claim 3, characterized in that, In S302, inserting the vertical fixing area into the scroll ring of the scroll structure specifically includes the following steps: In the vortex structure, several vertical layers to be laid are set sequentially from the inside to the outside of the vortex ring. The vertical layers to be laid are vertically set in the vortex structure. The vertical fixing area passes through the vertical layers to be laid. The position of the vertical fixing area corresponds one-to-one with the vertical layers to be laid. S3022. Several transverse layers to be laid are provided on the interlayer gap, which are horizontal to the interlayer gap. The transverse layers to be laid are located on the periphery of the reserved hole, and the folded horizontal connecting area is extended to the transverse layers to be laid.

5. A layering method for improving the firmness of embedded nut blocks according to claim 4, characterized in that, When the vertical fixing area is set on the vertical layer to be laid, the vertical fixing area is bent into an arc shape so that the vertical fixing area provides lateral support for the vortex structure.

6. The layering method for improving the firmness of the embedded nut block according to claim 4, characterized in that, Extending the folded horizontal connection area to the horizontal layer to be laid specifically includes the following steps: Centered on the inner ring of the vortex structure, the horizontal connecting area set in the innermost layer of the vortex structure is inserted into the transverse layer to be laid, which is farthest from the vortex structure. The horizontal connecting area set in the innermost layer of the vortex structure is inserted into the lateral layer to be laid, which is located at the second farthest point from the vortex structure. Perform the insertion action sequentially from the inside out or from the outside in until the patch insertion is completed.

7. The layering method for improving the firmness of embedded nut blocks according to claim 1, characterized in that, The prepreg roll and the large-area prepreg are made of the same resin base material; The patch is a continuously woven fiber prepreg, and the patch and the large-area prepreg are made of the same resin base.

8. A layup method for improving the firmness of embedded nut blocks according to any one of claims 1-7, characterized in that, After connecting and reinforcing the prepreg rolls with patches and locally reinforcing the rolls, the overall structure is heated and pressurized to complete the solidification. The heating includes external heating and internal heating. External heating specifically refers to heating the overall structure through an external heat source; Internal heating specifically involves setting up a heat source inside the overall structure for heating.

9. A layering method for improving the firmness of embedded nut blocks according to claim 8, characterized in that, The specific method of internal heating is as follows: The patch has a sandwich structure, and multiple channels are provided within the sandwich structure of the patch, wherein the channels are evenly distributed on the patch; Before the patch is inserted in three dimensions, heating elements are set according to the channel distribution in the patch. The heating elements are all strip-shaped or wire-shaped structures, and the connecting ends of the heating elements are all external and movable. The connecting ends are installed after the patch is inserted in three dimensions. After the patch is inserted in three dimensions, a heat source is connected for heating. After heating, the heat-generating component is extracted and pressurized.

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