A honeycomb core sandwich rotary body potting forming method

Abstract

The present application relates to the technical field of composite honeycomb sandwich structure forming manufacturing, in particular to a kind of honeycomb core sandwich rotary body filling forming method;The method first divides the rotary body honeycomb from whole into segments, and is pre-bent into shape, then two-step method is used to fill and seal the hole area of rotary body honeycomb core, by reserving certain gap in any adjacent bolt hole filling area, so that the filling glue will not crack due to stress, improve the overall surface quality of the workpiece after the upper skin lay-up, the solidification stress is smaller when filling in the second step, avoid the crack in filling area, finally after local filling, assemble into rotary body structure on the lower skin, so that it is easier to realize in engineering, and reduce the deformation of honeycomb core itself during solidification.

Description

Technical Field

[0001] This invention relates to the field of composite material honeycomb sandwich structure molding and manufacturing technology, and more specifically, to a method for potting and molding a honeycomb core sandwich rotating body. Background Technology

[0002] Honeycomb sandwich composite components offer advantages such as light weight and high specific stiffness, leading to their widespread application in the fuselages, control surfaces, wings, and engine nacelles of military and civilian aircraft. Engine nacelles, in particular, are widely used, with their air intakes primarily constructed from honeycomb sandwich composite rotating structures to achieve structural weight reduction. However, this process is complex, involving numerous key technologies and has long been monopolized by foreign companies. To withstand the concentrated loads generated at the joints within the sandwich structure, localized reinforcement of the honeycomb core in the connection areas is often necessary, such as… Figure 1 As shown, the commonly used method is to pot the honeycomb core, and then drill holes in the potted area to connect the sandwich composite structure with the other structural components using bolts or rivets.

[0003] For honeycomb sandwich composite rotating structures, such as engine nacelle air intakes, to meet the structural strength requirements of the connection area, it is usually necessary to set single or multiple rows of connection holes in the entire honeycomb sandwich connection area. The number of holes often reaches hundreds, and it is necessary to ensure that at least two core cells around each opening are filled with potting compound. To reduce operational difficulty and speed up production efficiency, a common process is to directly pot the entire connection area of ​​the honeycomb rotating structure, and then co-cure or co-bond it with the upper and lower skins. However, because large-area potting compound restricts the free deformation of the honeycomb core along the circumferential direction during curing, or because the curing pace of the potting compound, the adhesive film, and the skin is inconsistent, significant stress is generated during curing. Figure 2 As shown, X-ray inspection often reveals numerous cracks along the core lattice wall in the potting area. Therefore, it is necessary to optimize the potting method to improve the cracking problem in the honeycomb core connection area. Summary of the Invention

[0004] This invention addresses the problem of circumferential cracking in the large-area potting of the honeycomb core hole area during the molding of composite honeycomb sandwich rotary bodies using the vacuum bag-autoclave method. It proposes a potting molding method for honeycomb core sandwich rotary bodies, which involves segmenting the rotary honeycomb into sections and pre-bending them. A two-step potting method is used to pot the hole area of ​​the rotary honeycomb core. By leaving a certain gap in the potting area of ​​any adjacent bolt holes, the potting adhesive is prevented from cracking due to stress, thus improving the overall surface quality of the part after the upper skin is laid. The curing stress during the second potting step is relatively small, avoiding cracking in the potting area. After subsequent partial potting, the rotary body structure is assembled on the lower skin, making it easier to implement in engineering and reducing the deformation of the honeycomb core itself during curing.

[0005] The specific implementation details of this invention are as follows:

[0006] A method for potting and molding a honeycomb core sandwich rotary body involves uniformly dividing the honeycomb core into curved honeycomb along the circumferential direction, then pre-bending the curved honeycomb to obtain a preform, and then performing two partial potting operations on the preform. After potting, the preform is spliced ​​on the lower skin to form a honeycomb sandwich rotary body.

[0007] To better realize the present invention, the method further includes the following steps:

[0008] Step 1: Divide the honeycomb core into curved honeycomb sections evenly along the circumferential direction;

[0009] Step 2: Fabricate a preformed female mold fixture according to the curvature of the curved honeycomb, place the curved honeycomb on the preformed female mold fixture to obtain a preform, and fill the area of ​​the undefined positioning hole in the remaining area of ​​the curved honeycomb.

[0010] Step 3: Project the outline of the bolt holes and the outline of the filling area onto the outer surface of the curved honeycomb using a laser projector;

[0011] Step 4: Prepare the potting compound according to the set materials, use a dispensing gun to perform the first local potting of the potting area, and then cure it;

[0012] Step 5: Install the cured preform onto the molding die with the lower skin and adhesive film already laid, splice them according to the positioning hole positions to form a honeycomb core rotating body, and then cure;

[0013] Step 6: Pre-bond the cured honeycomb core rotating body to the lower skin;

[0014] Step 7: Use a laser projector to project the outline of the bolt holes and the outline of the potting area on the outer surface of the honeycomb core rotating body again, and use a glue gun to perform a second potting on the potting area until the potting glue fills the thickness of the honeycomb core cell.

[0015] Step 8: Lay the adhesive film and top skin on the honeycomb core, pre-press and seal the bag, then cure and demold to obtain the honeycomb core sandwich rotary body.

[0016] To better realize the present invention, further, when performing the first local potting in step 4, a certain gap is reserved between the potting areas of adjacent bolt holes.

[0017] To better realize the present invention, further, on the premise of ensuring that there is at least one row of core cells between adjacent bolt holes without potting, a potting gun is used to inject and pot each individual core cell in the potting area outline. The potting glue should completely fill the entire honeycomb core thickness direction. The potting glue is smoothed with a scraper, and the number of core cells exceeding the set maximum allowable number of potting glues is not more than the set maximum allowable number of core cells exceeding the potting area.

[0018] To better realize the present invention, further, in step 1, the honeycomb core is positioned with the W direction along the circumferential direction of the rotating body, the L direction along the width direction of the sandwich component, and the honeycomb core thickness direction along the axial direction of the rotating body; the honeycomb core is uniformly divided along the circumferential direction into segments with an arc length of 2±0.5m or segments with a rotation angle of 90-120°.

[0019] To better realize the present invention, further, the potting area in step 3 is the minimum potting area outline around a single bolt hole; the potting area outlines of two adjacent bolt holes have overlapping areas.

[0020] To better realize the present invention, further, when performing the first local potting in step 4, the potting area needs to reach 75%-90% of the total potting area of ​​the entire honeycomb core bolt holes.

[0021] To better realize the present invention, further, in step 5, when the cured preform is installed onto the molding mold with the lower skin and adhesive film laid down for splicing, the width of the adhesive film is equal to the thickness of the honeycomb core, and the lower skin is a cured skin or an uncured skin made of epoxy or bismaleimide resin-based prepreg.

[0022] To better realize the present invention, the upper skin is further described as an uncured skin made of epoxy or bismaleimide resin-based prepreg.

[0023] To better realize the present invention, further, when the honeycomb core is a honeycomb formed by impregnating aramid paper with phenolic resin, epoxy resin, cyanate ester resin, bismaleimide resin, polyimide resin and their modified resins, when bending it into a preform, the honeycomb core that has been stretched into a honeycomb shape but has not been impregnated with resin at the construction node is impregnated with resin, and then pre-bent on the molding fixture before the impregnated resin is cured and shaped; when the honeycomb core is an aluminum alloy or titanium alloy honeycomb, when bending it into a preform, it is pre-hot-pressed or rolled according to the curvature of the honeycomb core.

[0024] The present invention has the following beneficial effects:

[0025] (1) The present invention is based on vacuum bag-autoclave process, which divides the rotating honeycomb into segments and pre-bends them. After partial filling, the segments are assembled into a rotating structure on the lower skin, which makes it easier to implement in engineering and reduces the deformation of the honeycomb core itself during curing.

[0026] (2) The present invention uses a two-step method to fill the hole area of ​​the rotating honeycomb core. Based on the principle of minimum filling area, firstly, a certain gap is reserved in the filling area of ​​any adjacent bolt holes during the first step of local filling, so that the filling adhesive will not hinder the free deformation of the honeycomb core in the circumferential direction when it is heated and cooled during the curing process and when it is bonded to the lower skin. The filling adhesive will not crack due to stress. At the same time, the use of a female mold ensures the contour and surface quality of the filling adhesive facing the upper skin side of the honeycomb core, which improves the overall surface quality of the part after the upper skin is laid up. Secondly, in the second step of local filling, the honeycomb core has been pre-bonded with the skin and will not slip relative to each other. In this state, the remaining small area of ​​the core cells is filled and cured together with the upper skin. The curing stress is small, which avoids cracking in the filling area and solves the problem of circumferential cracking caused by large-area filling in the hole area of ​​the honeycomb core. Attached Figure Description

[0027] Figure 1 A schematic diagram showing the connection between a typical composite honeycomb sandwich component and other structural components in the potting area, as provided in an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram illustrating the circumferential cracking caused by large-area potting of a composite honeycomb sandwich rotating body provided in an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of honeycomb core segmentation provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the segmented curved honeycomb core being installed on a female mold according to an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of the contour of the filling area projected onto the female mold for a segmented curved honeycomb core provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the first partial potting of a segmented curved honeycomb core on a female mold, provided in an embodiment of the present invention.

[0033] Figure 7 This is a schematic diagram of a segmented curved honeycomb core spliced ​​onto a lower skin to form a rotating body, as provided in an embodiment of the present invention.

[0034] Figure 8 This is a schematic diagram of the second potting of a rotating honeycomb core provided in an embodiment of the present invention;

[0035] Figure 9 A schematic diagram of a composite honeycomb sandwich rotating component provided in an embodiment of the present invention.

[0036] Among them, 1. lower skin, 2. honeycomb core, 3. upper skin, 4. bolt, 5. potting compound, 6. structural component assembled with composite parts, 7. nut, 8. crack, 9. honeycomb core edge stop, 10. preformed female mold tooling, 11. outline of bolt hole in potting area, 12. outline of potting area, 13. foaming compound, 14. molding mold. Detailed Implementation

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments, and therefore should not be regarded as a limitation on the scope of protection. 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.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example 1:

[0040] This embodiment proposes a method for potting and molding a honeycomb core sandwich rotary body, such as... Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, the honeycomb core 2 is evenly divided into curved honeycombs along the circumference, and then the curved honeycomb is pre-bent into a preform. The preform is then partially potted twice, and after potting, it is spliced ​​on the lower skin 1 to form a honeycomb sandwich rotating body.

[0041] The method specifically includes the following steps.

[0042] Step 1: Divide the honeycomb core 2 into curved honeycomb along the circumferential direction.

[0043] Step 2: Fabricate a preformed female mold fixture 10 according to the curvature of the curved honeycomb, place the curved honeycomb on the preformed female mold fixture 10 to obtain a preform, and fill the area of ​​the undefined positioning hole in the remaining area of ​​the curved honeycomb.

[0044] Step 3: Project the outline 11 of the bolt hole and the outline 12 of the filling area onto the outer surface of the curved honeycomb using a laser projector.

[0045] Step 4: Prepare the potting compound according to the set materials, use a glue gun to perform the first local potting of the potting area, and then cure it.

[0046] Step 5: Install the cured preform onto the molding mold 14 with the lower skin 1 and adhesive film already laid, splice them according to the positioning hole positions to form a honeycomb core rotating body, and then cure.

[0047] Step 6: Pre-bond the cured honeycomb core rotating body to the lower skin 1.

[0048] Step 7: Use a laser projector to project the outline of the bolt holes and the outline of the potting area onto the outer surface of the honeycomb core rotating body again. Use a glue gun to perform a second potting on the potting area until the potting glue fills the thickness of the honeycomb core cell.

[0049] Step 8: Lay the adhesive film and the upper skin 3 on the honeycomb core 2, pre-press and seal the bag, and then cure. Demold to obtain the honeycomb core sandwich rotary body.

[0050] Working principle: In this embodiment, the honeycomb core 2 is divided into segments and pre-bent into shape. After partial potting, it is assembled into a rotating structure on the lower skin 1, which makes it easier to implement in engineering and reduces the deformation of the honeycomb core itself during curing. A two-step method is used to fill the hole area of ​​the honeycomb core 2. Based on the principle of minimum filling area, firstly, during the first step of local filling, a certain gap is reserved in the filling area of ​​any adjacent bolt holes. This ensures that the filling adhesive 5 will not hinder the free deformation of the honeycomb core 2 in the circumferential direction during the curing process and subsequent bonding with the lower skin 1. The filling adhesive 5 will not crack due to stress. At the same time, the pre-formed female mold tooling 10 ensures the contour and surface quality of the filling adhesive 5 facing the upper skin 3, improving the overall surface quality of the part after the upper skin 3 is laid up. Secondly, during the second step of local filling, the honeycomb core 2 has already been pre-bonded with the skin and will not slip relative to it. In this state, the remaining small area of ​​the core cells is filled and cured together with the upper skin 3. The curing stress is small, avoiding cracking in the filling area and solving the problem of circumferential cracking caused by large-area filling of the honeycomb core hole area.

[0051] Example 2:

[0052] This embodiment is based on the above embodiment 1, such as... Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, the method for potting and molding a honeycomb core sandwich rotary body based on the vacuum bag-autoclave process is explained.

[0053] The method includes the following steps.

[0054] Step 1: Divide the honeycomb core 2 along the circumferential direction, and divide the honeycomb core 2 into curved honeycomb evenly as a whole rotating body.

[0055] The honeycomb core 2 mentioned in step 1 is a honeycomb, aluminum alloy honeycomb, or titanium alloy honeycomb formed by impregnating para- or meta-aramid paper with phenolic resin, epoxy resin, cyanate ester resin, bismaleimide resin, polyimide resin, and their modified resins during the molding of honeycomb sandwich composite parts. Its structural form is a rotating body.

[0056] In step 1, the honeycomb core 2 is oriented along the circumference of the rotating body in the W direction, along the width direction of the sandwich component in the L direction, and along the axial direction of the rotating body in the thickness direction. According to the size of the honeycomb core 2, the segmentation principle of the honeycomb core 2 can be based on an arc length of 2±0.5m or a rotating body angle of 90-120°.

[0057] Step 2: Cut and process the honeycomb core 2 according to the segmented digital model size, place the honeycomb on the pre-forming female mold fixture 10, and perform pre-forming bending and pre-positioning holes.

[0058] In step 2, pre-forming bending refers to the process where the honeycomb core, after being stretched into a honeycomb shape but not impregnated with resin, is impregnated with resin and then pre-bent on a molding fixture before being cured and shaped by the impregnated resin. For aluminum alloy or titanium alloy honeycomb, it refers to the process where the honeycomb core is pre-hot-pressed or rolled according to the digital model curvature during the preparation of the honeycomb core.

[0059] In step 2, the positioning hole area should be pre-filled locally to ensure that at least two core cells around the hole are filled with potting compound 5, but the potting compound is only present in the excess area. The curing of potting compound 5 should be carried out simultaneously with the curing of the honeycomb preform. The positioning hole drilling should be completed before the honeycomb core 2 is demolded.

[0060] Step 3: Use a laser projector to project the outline of the bolt hole 11 and the outline of the filling area 12 onto the segmented honeycomb core 2.

[0061] The potting area mentioned in step 3 refers to the minimum potting area outline around a single bolt hole as required by the design drawings. The potting area outlines of any two adjacent bolt holes should have overlapping areas.

[0062] Step 4: Use protective materials to cover and protect the non-filled areas.

[0063] Step 5: Prepare the potting compound according to the material instructions, and use a glue gun to perform the first local potting of the potting area.

[0064] The first local potting described in step 5 involves injecting potting compound 5 into each individual cell in the potting area outline using a potting gun, provided that at least one row of core cells is left unpotted between any two bolt holes. The potting compound 5 should completely fill the entire honeycomb core thickness direction without any cavities or air holes. The potting compound 5 should be smoothed with a scraper, and the potting compound 5 should not exceed the maximum allowable number of core cells exceeding the potting area specified in the drawing.

[0065] The first local potting described in step 5 requires a potting area of ​​75%-90% of the total potting area at the bolt holes of the entire honeycomb core.

[0066] Step 6: Seal each segment of the honeycomb core 2 that has undergone the first partial potting into a bag and then send it into an oven or autoclave for potting adhesive curing.

[0067] Step 7: Demolding. Install each segmented honeycomb core described in Step 6 onto the molding mold 14, which has been laid with the honeycomb core undercoat 1 and the adhesive film, to form a rotating body. Position it using positioning holes.

[0068] In step 7, the segmented honeycomb core 2 is spliced ​​using strip foam adhesive, the width of which is consistent with the thickness of the honeycomb core 2. The lower skin 1 of the honeycomb core can be a cured skin or an uncured skin made of epoxy or bismaleimide resin-based prepreg.

[0069] The molding mold 14 mentioned in step 7 is a rotary molding mold for composite sandwich structure. The upper and lower ends of the honeycomb core 2 should be provided with honeycomb core edge blocks 9 to prevent the honeycomb core 2 from collapsing laterally during curing.

[0070] Step 8: Seal the bag. The rotating structure combining the lower skin 1 and the honeycomb core from Step 7 is sent into a hot autoclave for curing to pre-bond the honeycomb core 2 and the lower skin 1.

[0071] Step 9: Demolding. Use a laser projector to project the outline of the bolt hole 11 and the outline of the potting area 12 onto the honeycomb core 2 again. Use a glue gun to perform a second potting of the potting area.

[0072] The projected potting area described in step 9 is the same as that in step 3, which is the minimum potting area specified in the product model.

[0073] Step 9, the second potting, refers to the process of potting all remaining unpotted cells within the designated potting area, and then smoothing the potting compound with a scraper.

[0074] Step 10: Lay the adhesive film and the upper skin 3 on the honeycomb core 2 in sequence, pre-press and seal the bag, and then send it into the autoclave for curing.

[0075] The upper skin 3 mentioned in step 10 is an uncured skin made of epoxy or bismaleimide resin-based prepreg.

[0076] Step 11: Demolding to obtain a composite honeycomb sandwich rotary part that meets the drawing requirements.

[0077] The positioning holes in steps 2 and 7 are the same, and are the same hole positions in the digital model.

[0078] The other parts of this embodiment are the same as those in Embodiment 1 above, so they will not be described again.

[0079] Example 3:

[0080] Based on any one of the above embodiments 1-2, this embodiment takes a 2m diameter, 30mm thickness ACCH-1-5.5-48 aramid paper honeycomb core rotary body as an example to describe in detail the potting molding method of honeycomb core sandwich rotary body.

[0081] The method specifically includes the following steps.

[0082] Step 1: Press Figure 3 As shown, with the axis of the rotating honeycomb as the center, the honeycomb core 2 is evenly divided into 3 curved honeycomb cores at 120° intervals.

[0083] Step 2: For each segment of the honeycomb core 2, a special pre-forming female mold fixture 10 is designed according to the curvature of the digital model. The honeycomb core 2 is processed into a planar paper honeycomb of predetermined thickness and size according to the thickness of the digital model. After impregnation with resin, it is installed on the pre-forming female mold fixture 10 with honeycomb core edge blocks 9. The remaining area needs to be filled with the specified positioning holes. The vacuum bag is then placed in an oven or autoclave for curing and shaping until it reaches a bent state. Figure 4 As shown, a vacuum should be applied throughout the curing process, with the vacuum level controlled between -16±-33Kpa; here, the honeycomb state is that only the node adhesive is applied, without resin impregnation, and it has been stretched and shaped; the impregnating resin is phenolic resin.

[0084] Step 3: After preforming and removing auxiliary materials, mark the positioning holes in the remaining area.

[0085] Step 4: Using a laser projector, project the outline 11 of the bolt holes in the potting area and the minimum potting area outline 12 for each bolt hole onto the surface of the honeycomb core 2 described in Step 2, as shown below. Figure 5 As shown.

[0086] Step 5: After protecting the non-potting areas with materials such as masking tape, evenly mix the potting adhesive 5 according to the product instructions or material specifications, and then put it into the dispensing gun. Perform the first local potting on the core grid within the potting area outline 12 in Step 4, but it is necessary to follow the instructions... Figure 6 At least one row of core cells should be left unfilled between the bolt holes shown. All other core cells can be filled. The potting compound 5 should fill the entire thickness of the core cells and the surface should be smoothed with a scraper.

[0087] Step 6: Curing the segmented honeycomb core 2 potting compound 5 described in steps S4 and S5 using an oven or autoclave according to the curing requirements of the potting compound 5.

[0088] Step 7: After demolding the three segmented honeycomb cores 2, install them into the molding mold 14, which has been covered with the skin 3 and the adhesive film, according to the positioning holes specified in step S3. Use 30mm thick expanding foam 13 to splice the three segments of honeycomb cores 2, as follows: Figure 7 As shown; here, the upper skin 3 is the already cured upper skin 3; the foam 13 is a strip foam, model J-118.

[0089] Step 8: After sealing the combined structure in Step 7, pre-bond it in an autoclave. Taking the curing regime of adhesive film J-116 and skin prepreg GW3052 / BA9916 as an example, the initial vacuum inside the bag is -25 to -35 kPa, the curing heating and cooling rate is ≤3℃ / min, the pressure in the autoclave is set to 150±30 MPa, when the pressure in the autoclave rises to 100 kPa, the vacuum bag is vented to the atmosphere, when the hysteresis thermocouple rises to 120℃, after holding the temperature for 45 min, the temperature is further raised to 145℃ and held for 90 min, then the temperature is lowered to below 60℃ and the pressure is released.

[0090] Step 9: Project the outlines 11 of all the bolt holes in the potting areas and the smallest potting area outline 12 on the surface of the honeycomb core 2 using a laser projector. After protecting the non-potting areas with paper tape or similar materials, evenly mix the potting adhesive 5 according to the product instructions or material specifications and put it into the dispensing gun. Perform a second potting on all unpotted core cells within the potting area outlines. The potting adhesive 5 should fill the entire core cell thickness. Use a scraper to smooth the surface. Figure 8 As shown.

[0091] Step 10: After sequentially laying the adhesive film and upper skin 3 on the combined structure of step 9, seal and assemble the bag.

[0092] Step 11: The bag is placed in an autoclave for curing. The curing parameters are based on the curing regime of the adhesive film J-116 and the upper skin prepreg GW3052 / BA9916. The initial vacuum inside the bag is -25 to 35 kPa, the curing temperature rise and fall rate is ≤3℃ / min, and the pressure in the autoclave is set to 310±34 MPa. When the pressure in the autoclave rises to 69 kPa, the vacuum bag is vented to the atmosphere. When the hysteresis thermocouple rises to 175℃, the temperature is held for 120 minutes and then cooled down to below 60℃ to release the pressure.

[0093] Step 12: Demolding to obtain a composite honeycomb sandwich rotary blank that meets the requirements. Subsequent machining allowance and non-destructive testing are then performed to obtain the final product that meets the requirements.

[0094] The other parts of this embodiment are the same as any one of the embodiments 1-2 above, so they will not be described again.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A honeycomb core sandwich rotator infusion molding method, characterized by, The honeycomb core (2) is evenly divided into curved honeycombs along the ring direction, and then the curved honeycombs are pre-bent and formed to obtain a prefabricated part, and the prefabricated part is locally filled twice, and then the prefabricated part is spliced into a honeycomb core rotary body on the lower skin (1); Specifically comprising the following steps: Step 1: evenly divide the honeycomb core (2) into curved honeycombs along the ring direction; Step 2: make a preforming female die tooling (10) according to the curvature of the curved honeycomb, place the curved honeycomb on the preforming female die tooling (10) to obtain a prefabricated part, and fill the area to be positioned in the hole area of the excess area of the curved honeycomb; Step 3: project the filling area bolt hole contour (11) and the filling area contour (12) on the outer surface of the curved honeycomb using a laser projector; Step 4: adjust the filling glue according to the set material, and use a glue injection gun to perform first local filling on the filling area, and then solidify; Step 5: install the solidified prefabricated part into a forming die (14) with a laid lower skin (1) and a film, splice to form a honeycomb core rotary body according to the position of the positioning hole, and then solidify; Step 6: pre-glue the solidified honeycomb core rotary body and the lower skin (1); Step 7: project the filling area bolt hole contour (11) and the filling area contour (12) on the outer surface of the honeycomb core rotary body again using a laser projector, and then use a glue injection gun to perform second filling on the filling area until the filling glue fills the thickness of the honeycomb core cell; Step 8: lay the film and the upper skin (3) on the honeycomb core (2), pre-compact the bag, and then solidify and demold to obtain a honeycomb core sandwich rotary body; In the first local filling in step 4, a certain gap is reserved between adjacent bolt hole filling areas; Under the premise that at least 1 row of cells is not filled between adjacent bolt holes, each single cell in the filling area contour is injected and filled using a filling gun, the filling glue should completely fill the entire thickness direction of the honeycomb core, a scraper is used to scrape the filling glue, and the filling glue should not exceed the maximum allowed number of cells outside the filling area; In step 3, the filling area is the minimum filling area contour around a single bolt hole; adjacent two bolt hole filling area contours have an overlapping area.

2. A method of rotational fluid core sandwich molding of a honeycomb core sandwich body as defined in claim 1, wherein, In step 1, the honeycomb core (2) W direction is along the ring direction of the rotary body, the L direction is along the width direction of the sandwich part, and the thickness direction of the honeycomb core is along the axial direction of the rotary body; the honeycomb core (2) is evenly divided into segments according to the arc length 2±0.5m or according to the rotary body angle 90-120° along the ring direction.

3. A method of rotational fluid core sandwich molding of a honeycomb core sandwich body as defined in claim 1, wherein, In step 4, the filling area needs to reach 75%-90% of the total filling area of the honeycomb core bolt hole.

4. A method of rotational fluid core sandwich molding of a honeycomb core sandwich body as defined in claim 1, wherein, In step 5, when the solidified prefabricated part is installed into the forming die (14) with the laid lower skin (1) and the film to splice, the width of the film is equal to the thickness of the honeycomb core, and the lower skin (1) is an epoxy or bismaleimide resin-based prepreg laid solidified skin or unsolidified skin.

5. A method of rotational fluid core sandwich molding of a honeycomb core sandwich body as defined in claim 1, wherein, The upper skin (3) is an unsolidified skin laid by epoxy or bismaleimide resin-based prepreg.

6. A method of rotational fluid core sandwich molding of a honeycomb core sandwich body as defined in claim 1, wherein, When the honeycomb core (2) is formed of aramid paper impregnated with phenol formaldehyde resin, epoxy resin, cyanate ester resin, bismaleimide resin, polyimide resin and modified resin thereof, when bending into a preform, the honeycomb core whose construction joint glue has been stretched into a honeycomb shape but not impregnated with resin is impregnated with resin, and after pre-bending on a forming tool, the curing and setting of the impregnated resin is performed; when the honeycomb core (2) is an aluminum alloy or titanium alloy honeycomb, when bending into a preform, the honeycomb core (2) is pre-pressed or roll-bent according to the curvature.

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